4106 lines
184 KiB
HTML
4106 lines
184 KiB
HTML
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|
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/* Page Definitions */
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|
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|
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|
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|
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/* List Definitions */
|
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|
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|
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|
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|
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-->
|
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|
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|
||
</head>
|
||
|
||
<body lang=ZH-CN link=blue vlink=purple style='text-justify-trim:punctuation'>
|
||
|
||
<div class=WordSection1 style='layout-grid:15.6pt'>
|
||
|
||
<p class=ab><a name="_Toc53320609"><span style='font-family:黑体'>程序</span><span
|
||
lang=EN-US>8-7 linux/kernel/exit.c</span></a></p>
|
||
|
||
<div class=a align=center style='text-align:center'><span lang=EN-US>
|
||
|
||
<hr size=4 width="100%" align=center>
|
||
|
||
</span></div>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>1</span></u> <b><i>/*</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>2</span></u> <b><i> *
|
||
linux/kernel/exit.c</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>3</span></u> <b><i> *</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>4</span></u> <b><i> *
|
||
(C) 1991 Linus Torvalds</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>5</span></u> <b><i> */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>6</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>7</span></u>
|
||
#define <u><span style='color:blue'>DEBUG_PROC_TREE</span></u> // </span>定义符号“调试进程树”。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>8</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>9</span></u>
|
||
#include <errno.h> // </span>错误号头文件。包含系统中各种出错号。<span
|
||
lang=EN-US>(Linus</span>从<span lang=EN-US>minix</span>中引进的<span lang=EN-US>)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>10</span></u>
|
||
#include <signal.h> // </span>信号头文件。定义信号符号常量，信号结构以及信号操作函数原型。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>11</span></u>
|
||
#include <sys/wait.h> // </span>等待调用头文件。定义系统调用<span
|
||
lang=EN-US>wait()</span>和<span lang=EN-US>waitpid()</span>及相关常数符号。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>12</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>13</span></u>
|
||
#include <linux/sched.h> // </span>调度程序头文件，定义了任务结构<span lang=EN-US>task_struct</span>、任务<span
|
||
lang=EN-US>0</span>数据等。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>14</span></u>
|
||
#include <linux/kernel.h> // </span>内核头文件。含有一些内核常用函数的原形定义。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>15</span></u>
|
||
#include <linux/tty.h> // tty</span>头文件，定义了有关<span
|
||
lang=EN-US>tty_io</span>，串行通信方面的参数、常数。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>16</span></u>
|
||
#include <asm/segment.h> // </span>段操作头文件。定义了有关段寄存器操作的嵌入式汇编函数。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>17</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>18</span></u> int
|
||
<u><span style='color:blue'>sys_pause</span></u>(void);
|
||
// </span>把进程置为睡眠状态，直到收到信号（<span lang=EN-US>kernel/sched.c</span>，<span
|
||
lang=EN-US>164</span>行）。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>19</span></u> int
|
||
<u><span style='color:blue'>sys_close</span></u>(int fd); // </span>关闭指定文件的系统调用（<span
|
||
lang=EN-US>fs/open.c</span>，<span lang=EN-US>219</span>行）。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>20</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>释放指定进程占用的任务槽及其任务数据结构占用的内存页面。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数<span lang=EN-US>p </span>是任务数据结构指针。该函数在后面的
|
||
<span lang=EN-US>sys_kill() </span>和 <span lang=EN-US>sys_waitpid() </span>函数中被调用。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>扫描任务指针数组表 <span
|
||
lang=EN-US>task[] </span>以寻找指定的任务。如果找到，则首先清空该任务槽，然后释放</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>该任务数据结构所占用的内存页面，最后执行调度函数并在返回时立即退出。如果在任务数组</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>表中没有找到指定任务对应的项，则内核<span
|
||
lang=EN-US>panic</span><span lang=EN-US style='font-family:Wingdings'>J</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>21</span></u> void
|
||
<u><span style='color:blue'>release</span></u>(struct <u><span
|
||
style='color:blue'>task_struct</span></u> * p)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>22</span></u> {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>23</span></u>
|
||
int i;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>24</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果给定的任务结构指针为<span
|
||
lang=EN-US>NULL</span>则退出。如果该指针指向当前进程则显示警告信息退出。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>25</span></u>
|
||
if (!p)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>26</span></u>
|
||
return;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>27</span></u>
|
||
if (p == <u><span style='color:blue'>current</span></u>) {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>28</span></u>
|
||
<u><span style='color:blue'>printk</span></u>(<i>"task releasing
|
||
itself\n\r"</i>);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>29</span></u>
|
||
return;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>30</span></u>
|
||
}</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>扫描任务结构指针数组，寻找指定的任务<span
|
||
lang=EN-US>p</span>。如果找到，则置空任务指针数组中对应项，并且</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>更新任务结构之间的关联指针，释放任务<span
|
||
lang=EN-US>p</span>数据结构占用的内存页面。最后在执行调度程序</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>返回后退出。如果没有找到指定的任务<span
|
||
lang=EN-US>p</span>，则说明内核代码出错了，则显示出错信息并死机。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>更新链接部分的代码会把指定任务<span
|
||
lang=EN-US>p</span>从双向链表中删除。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>31</span></u>
|
||
for (i=1 ; i<<u><span style='color:blue'>NR_TASKS</span></u> ; i++)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>32</span></u>
|
||
if (<u><span style='color:blue'>task</span></u>[i]==p) {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>33</span></u>
|
||
<u><span style='color:blue'>task</span></u>[i]=<u><span style='color:blue'>NULL</span></u>;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>34</span></u>
|
||
<b><i>/* Update links */</i></b> /* </span>更新链接<span
|
||
lang=EN-US> */</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果<span lang=EN-US>p</span>不是最后（最老）的子进程，则让比其老的比邻进程指向比它新的比邻进程。如果<span
|
||
lang=EN-US>p</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>不是最新的子进程，则让比其新的比邻子进程指向比邻的老进程。
|
||
如果任务<span lang=EN-US>p </span>就是最新的</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>子进程，则还需要更新其父进程的最新子进程指针<span
|
||
lang=EN-US>cptr</span>为指向<span lang=EN-US>p</span>的比邻子进程。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>指针<span lang=EN-US>osptr</span>（<span
|
||
lang=EN-US>old sibling pointer</span>）指向比<span lang=EN-US>p</span>先创建的兄弟进程。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>指针<span lang=EN-US>ysptr</span>（<span
|
||
lang=EN-US>younger sibling pointer</span>）指向比<span lang=EN-US>p</span>后创建的兄弟进程。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>指针<span lang=EN-US>pptr</span>（<span
|
||
lang=EN-US>parent pointer</span>）指向<span lang=EN-US>p</span>的父进程。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>指针<span lang=EN-US>cptr</span>（<span
|
||
lang=EN-US>child pointer</span>）是父进程指向最新（最后）创建的子进程。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>35</span></u>
|
||
if (p->p_osptr)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>36</span></u>
|
||
p->p_osptr->p_ysptr = p->p_ysptr;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>37</span></u>
|
||
if (p->p_ysptr)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>38</span></u>
|
||
p->p_ysptr->p_osptr = p->p_osptr;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>39</span></u>
|
||
else</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>40</span></u>
|
||
p->p_pptr->p_cptr = p->p_osptr;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>41</span></u>
|
||
<u><span style='color:blue'>free_page</span></u>((long)p);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>42</span></u>
|
||
<u><span style='color:blue'>schedule</span></u>();</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>43</span></u>
|
||
return;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>44</span></u>
|
||
}</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>45</span></u>
|
||
<u><span style='color:blue'>panic</span></u>(<i>"trying to release
|
||
non-existent task"</i>);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>46</span></u> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>47</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>48</span></u>
|
||
#ifdef <u><span style='color:blue'>DEBUG_PROC_TREE</span></u></span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果定义了符号<span
|
||
lang=EN-US>DEBUG_PROC_TREE</span>，则编译时包括以下代码。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>49</span></u> <b><i>/*</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>50</span></u> <b><i> *
|
||
Check to see if a task_struct pointer is present in the task[] array</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>51</span></u> <b><i> *
|
||
Return 0 if found, and 1 if not found.</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>52</span></u> <b><i> */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> /*</span></p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>检查<span
|
||
lang=EN-US>task[]</span>数组中是否存在一个指定的<span lang=EN-US>task_struct</span>结构指针<span
|
||
lang=EN-US>p</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>如果存在则返回<span
|
||
lang=EN-US>0</span>，否则返回<span lang=EN-US>1</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> */</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>检测任务结构指针<span
|
||
lang=EN-US>p</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>53</span></u> int
|
||
<u><span style='color:blue'>bad_task_ptr</span></u>(struct <u><span
|
||
style='color:blue'>task_struct</span></u> *p)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>54</span></u> {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>55</span></u>
|
||
int i;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>56</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>57</span></u>
|
||
if (!p)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>58</span></u>
|
||
return 0;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>59</span></u>
|
||
for (i=0 ; i<<u><span style='color:blue'>NR_TASKS</span></u> ; i++)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>60</span></u>
|
||
if (<u><span
|
||
style='color:blue'>task</span></u>[i] == p)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>61</span></u>
|
||
return 0;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>62</span></u>
|
||
return 1;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>63</span></u> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>64</span></u>
|
||
</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>65</span></u> <b><i>/*</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>66</span></u> <b><i> *
|
||
This routine scans the pid tree and make sure the rep invarient still</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>67</span></u> <b><i> *
|
||
holds. Used for debugging only, since it's very slow....</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>68</span></u> <b><i> *</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>69</span></u> <b><i> *
|
||
It looks a lot scarier than it really is.... we're doing nothing more</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>70</span></u> <b><i> *
|
||
than verifying the doubly-linked list found in p_ysptr and p_osptr, </i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>71</span></u> <b><i> *
|
||
and checking it corresponds with the process tree defined by p_cptr and </i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>72</span></u> <b><i> *
|
||
p_pptr;</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>73</span></u> <b><i> */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> /*</span></p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>下面的函数用于扫描进程树，以确定更改过的链接仍然正确。仅用于调式，</p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>因为该函数比较慢<span
|
||
lang=EN-US>....</span></p>
|
||
|
||
<p class=a><span lang=EN-US> * </span></p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>该函数看上去要比实际的恐怖<span
|
||
lang=EN-US>.... </span>其实我们仅仅验证了指针<span lang=EN-US>p_ysptr</span>和</p>
|
||
|
||
<p class=a><span lang=EN-US> * p_osptr</span>构成的双向链表，并检查了链表与指针<span
|
||
lang=EN-US>p_cptr</span>和<span lang=EN-US>p_pptr</span>构成的</p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>进程树之间的关系。</p>
|
||
|
||
<p class=a><span lang=EN-US> */</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>检查进程树。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>74</span></u>
|
||
void <u><span style='color:blue'>audit_ptree</span></u>()</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>75</span></u> {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>76</span></u>
|
||
int i;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>77</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>扫描系统中的除任务<span
|
||
lang=EN-US>0</span>以外的所有任务，检查它们中<span lang=EN-US>4</span>个指针（<span lang=EN-US>pptr</span>、<span
|
||
lang=EN-US>cptr</span>、<span lang=EN-US>ysptr</span>和<span lang=EN-US>osptr</span>）</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>的正确性。若任务数组槽（项）为空则跳过。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>78</span></u>
|
||
for (i=1 ; i<<u><span style='color:blue'>NR_TASKS</span></u> ; i++) {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>79</span></u>
|
||
if (!<u><span style='color:blue'>task</span></u>[i])</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>80</span></u>
|
||
continue;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果任务的父进程指针<span
|
||
lang=EN-US>p_pptr</span>没有指向任何进程（即在任务数组中不存在），则显示警告信息</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>“警告，<span lang=EN-US>pid</span>号<span
|
||
lang=EN-US>N</span>的父进程链接有问题”。以下语句对<span lang=EN-US>cptr</span>、<span
|
||
lang=EN-US>ysptr</span>和<span lang=EN-US>osptr</span>进行类似操作。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>81</span></u>
|
||
if (<u><span style='color:blue'>bad_task_ptr</span></u>(<u><span
|
||
style='color:blue'>task</span></u>[i]->p_pptr))</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>82</span></u>
|
||
<u><span style='color:blue'>printk</span></u>(<i>"Warning, pid %d's parent
|
||
link is bad\n"</i>,</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>83</span></u>
|
||
<u><span style='color:blue'>task</span></u>[i]->pid);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>84</span></u>
|
||
if (<u><span style='color:blue'>bad_task_ptr</span></u>(<u><span
|
||
style='color:blue'>task</span></u>[i]->p_cptr))</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>85</span></u>
|
||
<u><span style='color:blue'>printk</span></u>(<i>"Warning, pid %d's child
|
||
link is bad\n"</i>,</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>86</span></u>
|
||
<u><span style='color:blue'>task</span></u>[i]->pid);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>87</span></u>
|
||
if (<u><span style='color:blue'>bad_task_ptr</span></u>(<u><span
|
||
style='color:blue'>task</span></u>[i]->p_ysptr))</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>88</span></u>
|
||
<u><span style='color:blue'>printk</span></u>(<i>"Warning, pid %d's ys
|
||
link is bad\n"</i>,</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>89</span></u>
|
||
<u><span style='color:blue'>task</span></u>[i]->pid);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>90</span></u>
|
||
if (<u><span style='color:blue'>bad_task_ptr</span></u>(<u><span
|
||
style='color:blue'>task</span></u>[i]->p_osptr))</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>91</span></u>
|
||
<u><span style='color:blue'>printk</span></u>(<i>"Warning, pid %d's os
|
||
link is bad\n"</i>,</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>92</span></u>
|
||
<u><span style='color:blue'>task</span></u>[i]->pid);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果任务的父进程指针<span
|
||
lang=EN-US>p_pptr</span>指向了自己，则显示警告信息“警告，<span lang=EN-US>pid</span>号<span
|
||
lang=EN-US>N</span>的父进程链接</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>指针指向了自己”。以下语句对<span
|
||
lang=EN-US>cptr</span>、<span lang=EN-US>ysptr</span>和<span lang=EN-US>osptr</span>进行类似操作。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>93</span></u>
|
||
if (<u><span style='color:blue'>task</span></u>[i]->p_pptr == <u><span
|
||
style='color:blue'>task</span></u>[i])</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>94</span></u>
|
||
<u><span style='color:blue'>printk</span></u>(<i>"Warning, pid %d parent
|
||
link points to self\n"</i>);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>95</span></u>
|
||
if (<u><span style='color:blue'>task</span></u>[i]->p_cptr == <u><span
|
||
style='color:blue'>task</span></u>[i])</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>96</span></u>
|
||
<u><span style='color:blue'>printk</span></u>(<i>"Warning, pid %d child
|
||
link points to self\n"</i>);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>97</span></u>
|
||
if (<u><span style='color:blue'>task</span></u>[i]->p_ysptr == <u><span
|
||
style='color:blue'>task</span></u>[i])</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>98</span></u>
|
||
<u><span style='color:blue'>printk</span></u>(<i>"Warning, pid %d ys link
|
||
points to self\n"</i>);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>99</span></u>
|
||
if (<u><span style='color:blue'>task</span></u>[i]->p_osptr == <u><span
|
||
style='color:blue'>task</span></u>[i])</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>100</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>printk</span></u>(<i>"Warning, pid %d os link
|
||
points to self\n"</i>);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果任务有比自己先创建的比邻兄弟进程，那么就检查它们是否有共同的父进程，并检查这个</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>老兄进程的<span lang=EN-US>ysptr</span>指针是否正确地指向本进程。否则显示警告信息。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>101</span></u><span
|
||
lang=EN-US>
|
||
if (<u><span style='color:blue'>task</span></u>[i]->p_osptr) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>102</span></u><span
|
||
lang=EN-US>
|
||
if (<u><span style='color:blue'>task</span></u>[i]->p_pptr != <u><span
|
||
style='color:blue'>task</span></u>[i]->p_osptr->p_pptr)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>103</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>printk</span></u>(</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>104</span></u><span
|
||
lang=EN-US>
|
||
<i>"Warning, pid %d older sibling %d parent is %d\n"</i>,</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>105</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>task</span></u>[i]->pid, <u><span
|
||
style='color:blue'>task</span></u>[i]->p_osptr->pid,</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>106</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>task</span></u>[i]->p_osptr->p_pptr->pid);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>107</span></u><span
|
||
lang=EN-US>
|
||
if (<u><span style='color:blue'>task</span></u>[i]->p_osptr->p_ysptr != <u><span
|
||
style='color:blue'>task</span></u>[i])</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>108</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>printk</span></u>(</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>109</span></u><span
|
||
lang=EN-US>
|
||
<i>"Warning, pid %d older sibling %d has mismatched ys link\n"</i>,</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>110</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>task</span></u>[i]->pid, <u><span
|
||
style='color:blue'>task</span></u>[i]->p_osptr->pid);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>111</span></u><span
|
||
lang=EN-US>
|
||
}</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果任务有比自己后创建的比邻兄弟进程，那么就检查它们是否有共同的父进程，并检查这个</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>小弟进程的<span lang=EN-US>osptr</span>指针是否正确地指向本进程。否则显示警告信息。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>112</span></u><span
|
||
lang=EN-US>
|
||
if (<u><span style='color:blue'>task</span></u>[i]->p_ysptr) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>113</span></u><span
|
||
lang=EN-US>
|
||
if (<u><span style='color:blue'>task</span></u>[i]->p_pptr != <u><span
|
||
style='color:blue'>task</span></u>[i]->p_ysptr->p_pptr)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>114</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>printk</span></u>(</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>115</span></u><span
|
||
lang=EN-US>
|
||
<i>"Warning, pid %d younger sibling %d parent is %d\n"</i>,</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>116</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>task</span></u>[i]->pid, <u><span
|
||
style='color:blue'>task</span></u>[i]->p_osptr->pid,</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>117</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>task</span></u>[i]->p_osptr->p_pptr->pid);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>118</span></u><span
|
||
lang=EN-US>
|
||
if (<u><span style='color:blue'>task</span></u>[i]->p_ysptr->p_osptr != <u><span
|
||
style='color:blue'>task</span></u>[i])</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>119</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>printk</span></u>(</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>120</span></u><span
|
||
lang=EN-US>
|
||
<i>"Warning, pid %d younger sibling %d has mismatched os link\n"</i>,</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>121</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>task</span></u>[i]->pid, <u><span
|
||
style='color:blue'>task</span></u>[i]->p_ysptr->pid);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>122</span></u><span
|
||
lang=EN-US>
|
||
}</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果任务的最新子进程指针<span
|
||
lang=EN-US>cptr</span>不空，那么检查该子进程的父进程是否是本进程，并检查该</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>子进程的小弟进程指针<span
|
||
lang=EN-US>yspter</span>是否为空。若不是则显示警告信息。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>123</span></u><span
|
||
lang=EN-US>
|
||
if (<u><span style='color:blue'>task</span></u>[i]->p_cptr) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>124</span></u><span
|
||
lang=EN-US>
|
||
if (<u><span style='color:blue'>task</span></u>[i]->p_cptr->p_pptr != <u><span
|
||
style='color:blue'>task</span></u>[i])</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>125</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>printk</span></u>(</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>126</span></u><span
|
||
lang=EN-US>
|
||
<i>"Warning, pid %d youngest child %d has mismatched parent link\n"</i>,</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>127</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>task</span></u>[i]->pid, <u><span
|
||
style='color:blue'>task</span></u>[i]->p_cptr->pid);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>128</span></u><span
|
||
lang=EN-US>
|
||
if (<u><span style='color:blue'>task</span></u>[i]->p_cptr->p_ysptr)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>129</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>printk</span></u>(</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>130</span></u><span
|
||
lang=EN-US>
|
||
<i>"Warning, pid %d youngest child %d has non-NULL ys link\n"</i>,</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>131</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>task</span></u>[i]->pid, <u><span
|
||
style='color:blue'>task</span></u>[i]->p_cptr->pid);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>132</span></u><span
|
||
lang=EN-US>
|
||
}</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>133</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>134</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>135</span></u><span
|
||
lang=EN-US> #endif <b><i>/* DEBUG_PROC_TREE */</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>136</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>向指定任务<span
|
||
lang=EN-US>p</span>发送信号<span lang=EN-US>sig</span>，权限为<span lang=EN-US>priv</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数：<span lang=EN-US>sig
|
||
- </span>信号值；<span lang=EN-US>p - </span>指定任务的指针；<span lang=EN-US>priv - </span>强制发送信号的标志。即不需要考虑进程</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>用户属性或级别而能发送信号的权利。该函数首先判断参数的正确性，然后判断条件是否满足。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果满足就向指定进程发送信号<span
|
||
lang=EN-US>sig</span>并退出，否则返回未许可错误号。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>137</span></u><span
|
||
lang=EN-US> static inline int <u><span style='color:blue'>send_sig</span></u>(long
|
||
sig,struct <u><span style='color:blue'>task_struct</span></u> * p,int priv)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>138</span></u><span
|
||
lang=EN-US> {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果没有权限，并且当前进程的有效用户<span
|
||
lang=EN-US>ID</span>与进程<span lang=EN-US>p</span>的不同，并且也不是超级用户，则说明</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>没有向<span lang=EN-US>p</span>发送信号的权利。<span
|
||
lang=EN-US>suser()</span>定义为<span lang=EN-US>(current->euid==0)</span>，用于判断是否是超级用户。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>139</span></u><span
|
||
lang=EN-US> if (!p)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>140</span></u><span
|
||
lang=EN-US>
|
||
return -<u><span style='color:blue'>EINVAL</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>141</span></u><span
|
||
lang=EN-US> if (!priv
|
||
&& (<u><span style='color:blue'>current</span></u>->euid!=p->euid)
|
||
&& !<u><span style='color:blue'>suser</span></u>())</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>142</span></u><span
|
||
lang=EN-US>
|
||
return -<u><span style='color:blue'>EPERM</span></u>;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>若需要发送的信号是<span
|
||
lang=EN-US>SIGKILL</span>或<span lang=EN-US> SIGCONT</span>，那么如果此时接收信号的进程 <span
|
||
lang=EN-US>p</span>正处于停止状态</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>就置其为就绪（运行）状态。然后修改进程<span
|
||
lang=EN-US>p</span>的信号位图<span lang=EN-US>signal</span>，去掉（复位）会导致进程</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>停止的信号<span lang=EN-US>SIGSTOP</span>、<span
|
||
lang=EN-US>SIGTSTP</span>、<span lang=EN-US>SIGTTIN</span>和<span lang=EN-US>SIGTTOU</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>143</span></u><span
|
||
lang=EN-US> if ((sig == <u><span
|
||
style='color:blue'>SIGKILL</span></u>) || (sig == <u><span style='color:blue'>SIGCONT</span></u>))
|
||
{</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>144</span></u><span
|
||
lang=EN-US>
|
||
if (p-><u><span style='color:blue'>state</span></u> == <u><span
|
||
style='color:blue'>TASK_STOPPED</span></u>)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>145</span></u><span
|
||
lang=EN-US>
|
||
p-><u><span style='color:blue'>state</span></u> = <u><span style='color:
|
||
blue'>TASK_RUNNING</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>146</span></u><span
|
||
lang=EN-US>
|
||
p->exit_code = 0;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>147</span></u><span
|
||
lang=EN-US>
|
||
p->signal &= ~( (1<<(<u><span style='color:blue'>SIGSTOP</span></u>-1))
|
||
| (1<<(<u><span style='color:blue'>SIGTSTP</span></u>-1)) |</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>148</span></u><span
|
||
lang=EN-US>
|
||
(1<<(<u><span style='color:blue'>SIGTTIN</span></u>-1)) | (1<<(<u><span
|
||
style='color:blue'>SIGTTOU</span></u>-1)) );</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>149</span></u><span
|
||
lang=EN-US> } </span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>150</span></u><span
|
||
lang=EN-US> <b><i>/* If the
|
||
signal will be ignored, don't even post it */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
/* </span>如果要发送的信号<span lang=EN-US>sig</span>将被进程<span lang=EN-US>p</span>忽略掉，那么就根本不用发送<span
|
||
lang=EN-US> */</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>151</span></u><span
|
||
lang=EN-US> if ((int) p-><u><span
|
||
style='color:blue'>sigaction</span></u>[sig-1].sa_handler == 1)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>152</span></u><span
|
||
lang=EN-US>
|
||
return 0;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>153</span></u><span
|
||
lang=EN-US> <b><i>/* Depends on
|
||
order SIGSTOP, SIGTSTP, SIGTTIN, SIGTTOU */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
/* </span>以下判断依赖于<span lang=EN-US>SIGSTOP</span>、<span lang=EN-US>SIGTSTP</span>、<span
|
||
lang=EN-US>SIGTTIN</span>和<span lang=EN-US>SIGTTOU</span>的次序<span lang=EN-US>
|
||
*/</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果信号是<span lang=EN-US>SIGSTOP</span>、<span
|
||
lang=EN-US>SIGTSTP</span>、<span lang=EN-US>SIGTTIN</span>和<span lang=EN-US>SIGTTOU</span>之一，那么说明要让接收信号的进程<span
|
||
lang=EN-US>p</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>停止运行。因此（若<span
|
||
lang=EN-US>p </span>的信号位图中有<span lang=EN-US> SIGCONT </span>置位）就需要复位位图中继续运行的信号</p>
|
||
|
||
<p class=a><span lang=EN-US> // SIGCONT</span>比特位。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>154</span></u><span
|
||
lang=EN-US> if ((sig >= <u><span
|
||
style='color:blue'>SIGSTOP</span></u>) && (sig <= <u><span
|
||
style='color:blue'>SIGTTOU</span></u>)) </span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>155</span></u><span
|
||
lang=EN-US>
|
||
p->signal &= ~(1<<(<u><span style='color:blue'>SIGCONT</span></u>-1));</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>156</span></u><span
|
||
lang=EN-US> <b><i>/* Actually
|
||
deliver the signal */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
/* </span>最后，我们向进程<span lang=EN-US>p</span>发送信号<span lang=EN-US>p */</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>157</span></u><span
|
||
lang=EN-US> p->signal |=
|
||
(1<<(sig-1));</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>158</span></u><span
|
||
lang=EN-US> return 0;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>159</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>160</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>根据进程组号<span
|
||
lang=EN-US>pgrp</span>取得进程组所属的会话号。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>扫描任务数组，寻找进程组号为<span
|
||
lang=EN-US>pgrp</span>的进程，并返回其会话号。如果没有找到指定进程组号</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>为<span lang=EN-US>pgrp</span>的任何进程，则返回<span
|
||
lang=EN-US>-1</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>161</span></u><span
|
||
lang=EN-US> int <u><span style='color:blue'>session_of_pgrp</span></u>(int
|
||
pgrp)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>162</span></u><span
|
||
lang=EN-US> {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>163</span></u><span
|
||
lang=EN-US> struct <u><span
|
||
style='color:blue'>task_struct</span></u> **p;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>164</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>165</span></u><span
|
||
lang=EN-US> for (p = &<u><span
|
||
style='color:blue'>LAST_TASK</span></u> ; p > &<u><span
|
||
style='color:blue'>FIRST_TASK</span></u> ; --p)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>166</span></u><span
|
||
lang=EN-US> if
|
||
((*p)->pgrp == pgrp)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>167</span></u><span
|
||
lang=EN-US>
|
||
return((*p)->session);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>168</span></u><span
|
||
lang=EN-US> return -1;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>169</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>170</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>终止进程组（向进程组发送信号）。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数：<span lang=EN-US>pgrp
|
||
- </span>指定的进程组号；<span lang=EN-US>sig - </span>指定的信号；<span lang=EN-US>priv - </span>权限。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>即向指定进程组<span
|
||
lang=EN-US>pgrp</span>中的每个进程发送指定信号<span lang=EN-US>sig</span>。只要向一个进程发送成功最后就会</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>返回<span lang=EN-US>0</span>，否则如果没有找到指定进程组号<span
|
||
lang=EN-US>pgrp</span>的任何一个进程，则返回出错号<span lang=EN-US>-ESRCH</span>，若</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>找到进程组号是<span
|
||
lang=EN-US>pgrp</span>的进程，但是发送信号失败，则返回发送失败的错误码。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>171</span></u><span
|
||
lang=EN-US> int <u><span style='color:blue'>kill_pg</span></u>(int pgrp, int
|
||
sig, int priv)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>172</span></u><span
|
||
lang=EN-US> {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>173</span></u><span
|
||
lang=EN-US> struct <u><span
|
||
style='color:blue'>task_struct</span></u> **p;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>174</span></u><span
|
||
lang=EN-US> int err,retval = -<u><span
|
||
style='color:blue'>ESRCH</span></u>;
|
||
// -ESRCH</span>表示指定的进程不存在。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>175</span></u><span
|
||
lang=EN-US> int found = 0;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>176</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>首先判断给定的信号和进程组号是否有效。然后扫描系统中所有任务。若扫描到进程组号为</p>
|
||
|
||
<p class=a><span lang=EN-US> // pgrp</span>的进程，就向其发送信号<span
|
||
lang=EN-US>sig</span>。只要有一次信号发送成功，函数最后就会返回<span lang=EN-US>0</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>177</span></u><span
|
||
lang=EN-US> if (sig<1 ||
|
||
sig>32 || pgrp<=0)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>178</span></u><span
|
||
lang=EN-US>
|
||
return -<u><span style='color:blue'>EINVAL</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>179</span></u><span
|
||
lang=EN-US> for (p = &<u><span
|
||
style='color:blue'>LAST_TASK</span></u> ; p > &<u><span
|
||
style='color:blue'>FIRST_TASK</span></u> ; --p)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>180</span></u><span
|
||
lang=EN-US>
|
||
if ((*p)->pgrp == pgrp) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>181</span></u><span
|
||
lang=EN-US>
|
||
if (sig && (err = <u><span style='color:blue'>send_sig</span></u>(sig,*p,priv)))</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>182</span></u><span
|
||
lang=EN-US>
|
||
retval = err;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>183</span></u><span
|
||
lang=EN-US>
|
||
else</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>184</span></u><span
|
||
lang=EN-US>
|
||
found++;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>185</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>186</span></u><span
|
||
lang=EN-US> return(found ? 0 :
|
||
retval);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>187</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>188</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>终止进程（向进程发送信号）。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数：<span lang=EN-US>pid
|
||
- </span>进程号；<span lang=EN-US>sig - </span>指定信号；<span lang=EN-US>priv - </span>权限。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>即向进程号为<span
|
||
lang=EN-US>pid</span>的进程发送指定信号<span lang=EN-US>sig</span>。若找到指定<span
|
||
lang=EN-US>pid</span>的进程，那么若信号发送成功，</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>则返回<span lang=EN-US>0</span>，否则返回信号发送出错号。如果没有找到指定进程号<span
|
||
lang=EN-US>pid</span>的进程，则返回出错号</p>
|
||
|
||
<p class=a><span lang=EN-US> // -ESRCH</span>（指定进程不存在）。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>189</span></u><span
|
||
lang=EN-US> int <u><span style='color:blue'>kill_proc</span></u>(int pid, int
|
||
sig, int priv)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>190</span></u><span
|
||
lang=EN-US> {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>191</span></u><span
|
||
lang=EN-US> struct <u><span
|
||
style='color:blue'>task_struct</span></u> **p;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>192</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>193</span></u><span
|
||
lang=EN-US> if (sig<1 ||
|
||
sig>32)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>194</span></u><span
|
||
lang=EN-US>
|
||
return -<u><span style='color:blue'>EINVAL</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>195</span></u><span
|
||
lang=EN-US> for (p = &<u><span
|
||
style='color:blue'>LAST_TASK</span></u> ; p > &<u><span
|
||
style='color:blue'>FIRST_TASK</span></u> ; --p)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>196</span></u><span
|
||
lang=EN-US>
|
||
if ((*p)->pid == pid)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>197</span></u><span
|
||
lang=EN-US>
|
||
return(sig ? <u><span style='color:blue'>send_sig</span></u>(sig,*p,priv) : 0);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>198</span></u><span
|
||
lang=EN-US> return(-<u><span
|
||
style='color:blue'>ESRCH</span></u>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>199</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>200</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>201</span></u><span
|
||
lang=EN-US> <b><i>/*</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>202</span></u><span
|
||
lang=EN-US> <b><i> * POSIX specifies that kill(-1,sig) is unspecified, but
|
||
what we have</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>203</span></u><span
|
||
lang=EN-US> <b><i> * is probably wrong. Should make it like BSD or
|
||
SYSV.</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>204</span></u><span
|
||
lang=EN-US> <b><i> */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> /*</span></p>
|
||
|
||
<p class=a><span lang=EN-US> * POSIX</span>标准指明<span
|
||
lang=EN-US>kill(-1,sig)</span>未定义。但是我所知道的可能错了。应该让它</p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>象<span
|
||
lang=EN-US>BSD</span>或<span lang=EN-US>SYSV</span>系统一样。</p>
|
||
|
||
<p class=a><span lang=EN-US> */</span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>系统调用<span
|
||
lang=EN-US>kill()</span>可用于向任何进程或进程组发送任何信号，而并非只是杀死进程<span lang=EN-US
|
||
style='font-family:Wingdings'>J</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数<span lang=EN-US>pid</span>是进程号；<span
|
||
lang=EN-US>sig</span>是需要发送的信号。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果<span lang=EN-US>pid</span>值<span
|
||
lang=EN-US>>0</span>，则信号被发送给进程号是<span lang=EN-US>pid</span>的进程。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果<span lang=EN-US>pid=0</span>，那么信号就会被发送给当前进程的进程组中所有的进程。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果<span lang=EN-US>pid=-1</span>，则信号<span
|
||
lang=EN-US>sig</span>就会发送给除第一个进程（初始进程）外的所有进程。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果<span lang=EN-US>pid
|
||
< -1</span>，则信号<span lang=EN-US>sig</span>将发送给进程组<span lang=EN-US>-pid</span>的所有进程。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果信号<span lang=EN-US>sig</span>为<span
|
||
lang=EN-US>0</span>，则不发送信号，但仍会进行错误检查。如果成功则返回<span lang=EN-US>0</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>该函数扫描任务数组表，并根据<span
|
||
lang=EN-US>pid</span>对满足条件的进程发送指定信号<span lang=EN-US>sig</span>。若<span
|
||
lang=EN-US>pid</span>等于<span lang=EN-US>0</span>，</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>表明当前进程是进程组组长，因此需要向所有组内的进程强制发送信号<span
|
||
lang=EN-US>sig</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>205</span></u><span
|
||
lang=EN-US> int <u><span style='color:blue'>sys_kill</span></u>(int pid,int
|
||
sig)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>206</span></u><span
|
||
lang=EN-US> {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>207</span></u><span
|
||
lang=EN-US> struct <u><span
|
||
style='color:blue'>task_struct</span></u> **p = <u><span style='color:blue'>NR_TASKS</span></u>
|
||
+ <u><span style='color:blue'>task</span></u>; // p</span>指向任务数组最后一项。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>208</span></u><span
|
||
lang=EN-US> int err, retval =
|
||
0;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>209</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>210</span></u><span
|
||
lang=EN-US> if (!pid)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>211</span></u><span
|
||
lang=EN-US>
|
||
return(<u><span style='color:blue'>kill_pg</span></u>(<u><span
|
||
style='color:blue'>current</span></u>->pid,sig,0));</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>212</span></u><span
|
||
lang=EN-US> if (pid == -1) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>213</span></u><span
|
||
lang=EN-US>
|
||
while (--p > &<u><span style='color:blue'>FIRST_TASK</span></u>)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>214</span></u><span
|
||
lang=EN-US>
|
||
if (err = <u><span style='color:blue'>send_sig</span></u>(sig,*p,0))</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>215</span></u><span
|
||
lang=EN-US>
|
||
retval = err;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>216</span></u><span
|
||
lang=EN-US>
|
||
return(retval);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>217</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>218</span></u><span
|
||
lang=EN-US> if (pid < 0) </span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>219</span></u><span
|
||
lang=EN-US>
|
||
return(<u><span style='color:blue'>kill_pg</span></u>(-pid,sig,0));</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>220</span></u><span
|
||
lang=EN-US> <b><i>/* Normal
|
||
kill */</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>221</span></u><span
|
||
lang=EN-US> return(<u><span
|
||
style='color:blue'>kill_proc</span></u>(pid,sig,0));</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>222</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>223</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>224</span></u><span
|
||
lang=EN-US> <b><i>/*</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>225</span></u><span
|
||
lang=EN-US> <b><i> * Determine if a process group is "orphaned",
|
||
according to the POSIX</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>226</span></u><span
|
||
lang=EN-US> <b><i> * definition in 2.2.2.52. Orphaned process groups are not to be affected</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>227</span></u><span
|
||
lang=EN-US> <b><i> * by terminal-generated stop signals. Newly
|
||
orphaned process groups are </i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>228</span></u><span
|
||
lang=EN-US> <b><i> * to receive a SIGHUP and a SIGCONT.</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>229</span></u><span
|
||
lang=EN-US> <b><i> * </i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>230</span></u><span
|
||
lang=EN-US> <b><i> * "I ask you, have you ever known what it is to be
|
||
an orphan?"</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>231</span></u><span
|
||
lang=EN-US> <b><i> */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> /*</span></p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>根据<span
|
||
lang=EN-US>POSIX</span>标准<span
|
||
lang=EN-US>2.2.2</span><span lang=EN-US>.52</span>节中的定义，确定一个进程组是否是“孤儿”。孤儿进程</p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>组不会受到终端产生的停止信号的影响。新近产生的孤儿进程组将会收到一个<span
|
||
lang=EN-US>SIGHUP</span></p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>信号和一个<span
|
||
lang=EN-US>SIGCONT</span>信号。</p>
|
||
|
||
<p class=a><span lang=EN-US> * </span></p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>“我问你，你是否真正知道作为一个孤儿意味着什么？”</p>
|
||
|
||
<p class=a><span lang=EN-US> */</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>以上提到的<span lang=EN-US>POSIX
|
||
P1003.1 2.2.2.52</span>节是关于孤儿进程组的描述。在两种情况下当一个进程</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>终止时可能导致进程组变成“孤儿”。<span
|
||
lang=EN-US> </span>一个进程组到其组外的父进程之间的联系依赖于该父</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>进程和其子进程两者。因此，若组外最后一个连接父进程的进程或最后一个父进程的直接后裔</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>终止的话，那么这个进程组就会成为一个孤儿进程组。在任何一种情况下，如果进程的终止导</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>致进程组变成孤儿进程组，那么进程组中的所有进程就会与它们的作业控制<span
|
||
lang=EN-US>shell</span>断开联系。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>作业控制<span lang=EN-US>shell</span>将不再具有该进程组存在的任何信息。而该进程组中处于停止状态的进程将会</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>永远消失。为了解决这个问题，含有停止状态进程的新近产生的孤儿进程组就需要接收到一个</p>
|
||
|
||
<p class=a><span lang=EN-US> // SIGHUP</span>信号和一个<span
|
||
lang=EN-US>SIGCONT</span>信号，用于指示它们已经从它们的会话（ <span lang=EN-US>session</span>）中断开联系。</p>
|
||
|
||
<p class=a><span lang=EN-US> // SIGHUP</span>信号将导致进程组中成员被终止，除非它们捕获或忽略了<span
|
||
lang=EN-US>SIGHUP</span>信号。而<span lang=EN-US> SIGCONT</span>信</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>号将使那些没有被<span
|
||
lang=EN-US>SIGHUP</span>信号终止的进程继续运行。 但在大多数情况下，如果组中有一个进</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>程处于停止状态，那么组中所有的进程可能都处于停止状态。</p>
|
||
|
||
<p class=a><span lang=EN-US> //</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>判断一个进程组是否是孤儿进程。如果不是则返回<span
|
||
lang=EN-US>0</span>；如果是则返回<span lang=EN-US>1</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>扫描任务数组。如果任务项空，或者进程的组号与指定的不同，或者进程已经处于僵死状态，</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>或者进程的父进程是<span
|
||
lang=EN-US>init</span>进程，则说明扫描的进程不是指定进程组的成员，或者不满足要求，</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>于是跳过。 否则说明该进程是指定组的成员并且其父进程不是
|
||
<span lang=EN-US>init</span>进程。此时如果该进程</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>父进程的组号不等于指定的组号<span
|
||
lang=EN-US>pgrp</span>，但父进程的会话号等于进程的会话号，则说明它们同</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>属于一个会话。因此指定的<span
|
||
lang=EN-US>pgrp</span>进程组肯定不是孤儿进程组。否则<span lang=EN-US>...</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>232</span></u><span
|
||
lang=EN-US> int <u><span style='color:blue'>is_orphaned_pgrp</span></u>(int
|
||
pgrp)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>233</span></u><span
|
||
lang=EN-US> {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>234</span></u><span
|
||
lang=EN-US> struct <u><span
|
||
style='color:blue'>task_struct</span></u> **p;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>235</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>236</span></u><span
|
||
lang=EN-US> for (p = &<u><span
|
||
style='color:blue'>LAST_TASK</span></u> ; p > &<u><span
|
||
style='color:blue'>FIRST_TASK</span></u> ; --p) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>237</span></u><span
|
||
lang=EN-US>
|
||
if (!(*p) ||</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>238</span></u><span
|
||
lang=EN-US>
|
||
((*p)->pgrp != pgrp) || </span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>239</span></u><span
|
||
lang=EN-US>
|
||
((*p)-><u><span style='color:blue'>state</span></u> == <u><span
|
||
style='color:blue'>TASK_ZOMBIE</span></u>) ||</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>240</span></u><span
|
||
lang=EN-US>
|
||
((*p)->p_pptr->pid == 1))</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>241</span></u><span
|
||
lang=EN-US>
|
||
continue;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>242</span></u><span
|
||
lang=EN-US>
|
||
if (((*p)->p_pptr->pgrp != pgrp) &&</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>243</span></u><span
|
||
lang=EN-US>
|
||
((*p)->p_pptr->session == (*p)->session))</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>244</span></u><span
|
||
lang=EN-US>
|
||
return 0;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>245</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>246</span></u><span
|
||
lang=EN-US>
|
||
return(1); <b><i>/* (sighing) "Often!"
|
||
*/</i></b> /* </span>（唉）是孤儿进程组！<span lang=EN-US>*/</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>247</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>248</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>判断进程组中是否含有处于停止状态的作业（进程组）。有则返回<span
|
||
lang=EN-US>1</span>；无则返回<span lang=EN-US>0</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>查找方法是扫描整个任务数组。检查属于指定组<span
|
||
lang=EN-US>pgrp</span>的任何进程是否处于停止状态。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>249</span></u><span
|
||
lang=EN-US> static int <u><span style='color:blue'>has_stopped_jobs</span></u>(int
|
||
pgrp)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>250</span></u><span
|
||
lang=EN-US> {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>251</span></u><span
|
||
lang=EN-US> struct <u><span
|
||
style='color:blue'>task_struct</span></u> ** p;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>252</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>253</span></u><span
|
||
lang=EN-US> for (p = &<u><span
|
||
style='color:blue'>LAST_TASK</span></u> ; p > &<u><span
|
||
style='color:blue'>FIRST_TASK</span></u> ; --p) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>254</span></u><span
|
||
lang=EN-US>
|
||
if ((*p)->pgrp != pgrp)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>255</span></u><span
|
||
lang=EN-US>
|
||
continue;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>256</span></u><span
|
||
lang=EN-US>
|
||
if ((*p)-><u><span style='color:blue'>state</span></u> == <u><span
|
||
style='color:blue'>TASK_STOPPED</span></u>)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>257</span></u><span
|
||
lang=EN-US>
|
||
return(1);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>258</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>259</span></u><span
|
||
lang=EN-US> return(0);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>260</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>261</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>程序退出处理函数。在下面<span
|
||
lang=EN-US>365</span>行处被系统调用处理函数<span lang=EN-US>sys_exit()</span>调用。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>该函数将根据当前进程自身的特性对其进行处理，并把当前进程状态设置成僵死状态</p>
|
||
|
||
<p class=a><span lang=EN-US> // TASK_ZOMBIE</span>，最后调用调度函数<span
|
||
lang=EN-US>schedule()</span>去执行其它进程，不再返回。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>262</span></u><span
|
||
lang=EN-US> volatile void <u><span style='color:blue'>do_exit</span></u>(long
|
||
code)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>263</span></u><span
|
||
lang=EN-US> {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>264</span></u><span
|
||
lang=EN-US> struct <u><span
|
||
style='color:blue'>task_struct</span></u> *p;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>265</span></u><span
|
||
lang=EN-US> int i;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>266</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>首先释放当前进程代码段和数据段所占的内存页。
|
||
函数<span lang=EN-US>free_page_tables() </span>的第<span lang=EN-US>1</span>个参数</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>（<span lang=EN-US>get_base()</span>返回值）指明在<span
|
||
lang=EN-US>CPU</span>线性地址空间中起始基地址，第<span lang=EN-US>2</span>个（<span lang=EN-US>get_limit()</span>返回值）</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>说明欲释放的字节长度值。<span
|
||
lang=EN-US>get_base()</span>宏中的<span lang=EN-US>current->ldt[1]</span>给出进程代码段描述符的位置</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>（<span lang=EN-US>current->ldt[2]</span>给出进程代码段描述符的位置）；<span
|
||
lang=EN-US>get_limit()</span>中的<span lang=EN-US>0x0f</span>是进程代码段的</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>选择符（<span lang=EN-US>0x17</span>是进程数据段的选择符）。即在取段基地址时使用该段的描述符所处地址作为</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数，取段长度时使用该段的选择符作为参数。 <span
|
||
lang=EN-US>free_page_tables()</span>函数位于<span lang=EN-US>mm/memory.c</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>文件的第<span lang=EN-US>69</span>行开始处；<span
|
||
lang=EN-US>get_base()</span>和<span lang=EN-US>get_limit()</span>宏位于<span
|
||
lang=EN-US>include/linux/sched.h</span>头文件的第</p>
|
||
|
||
<p class=a><span lang=EN-US> // 264</span>行开始处。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>267</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>free_page_tables</span></u>(<u><span style='color:blue'>get_base</span></u>(<u><span
|
||
style='color:blue'>current</span></u>->ldt[1]),<u><span style='color:blue'>get_limit</span></u>(0x0f));</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>268</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>free_page_tables</span></u>(<u><span style='color:blue'>get_base</span></u>(<u><span
|
||
style='color:blue'>current</span></u>->ldt[2]),<u><span style='color:blue'>get_limit</span></u>(0x17));</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>然后关闭当前进程打开着的所有文件。再对当前进程的工作目录<span
|
||
lang=EN-US>pwd</span>、根目录<span lang=EN-US>root</span>、执行程序</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>文件的 <span lang=EN-US>i</span>节点以及库文件进行同步操作，放回各个
|
||
<span lang=EN-US>i</span>节点并分别置空（释放）。 接着把当前</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>进程的状态设置为僵死状态（<span
|
||
lang=EN-US>TASK_ZOMBIE</span>），并设置进程退出码。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>269</span></u><span
|
||
lang=EN-US> for (i=0 ; i<<u><span
|
||
style='color:blue'>NR_OPEN</span></u> ; i++)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>270</span></u><span
|
||
lang=EN-US>
|
||
if (<u><span style='color:blue'>current</span></u>->filp[i])</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>271</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>sys_close</span></u>(i);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>272</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>iput</span></u>(<u><span style='color:blue'>current</span></u>->pwd);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>273</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>current</span></u>->pwd = <u><span style='color:blue'>NULL</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>274</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>iput</span></u>(<u><span style='color:blue'>current</span></u>->root);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>275</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>current</span></u>->root = <u><span style='color:blue'>NULL</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>276</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>iput</span></u>(<u><span style='color:blue'>current</span></u>->executable);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>277</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>current</span></u>->executable = <u><span
|
||
style='color:blue'>NULL</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>278</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>iput</span></u>(<u><span style='color:blue'>current</span></u>->library);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>279</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>current</span></u>->library = <u><span style='color:blue'>NULL</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>280</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>current</span></u>-><u><span style='color:blue'>state</span></u>
|
||
= <u><span style='color:blue'>TASK_ZOMBIE</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>281</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>current</span></u>->exit_code = code;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>282</span></u><span
|
||
lang=EN-US> <b><i>/* </i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>283</span></u><span
|
||
lang=EN-US> <b><i> * Check
|
||
to see if any process groups have become orphaned</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>284</span></u><span
|
||
lang=EN-US> <b><i> * as a
|
||
result of our exiting, and if they have any stopped</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>285</span></u><span
|
||
lang=EN-US> <b><i> * jobs,
|
||
send them a SIGUP and then a SIGCONT. (POSIX 3.2.2.2)</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>286</span></u><span
|
||
lang=EN-US> <b><i> *</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>287</span></u><span
|
||
lang=EN-US> <b><i> * Case
|
||
i: Our father is in a different pgrp than we are</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>288</span></u><span
|
||
lang=EN-US> <b><i> * and
|
||
we were the only connection outside, so our pgrp</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>289</span></u><span
|
||
lang=EN-US> <b><i> * is
|
||
about to become orphaned.</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>290</span></u><span
|
||
lang=EN-US> <b><i> */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> /*</span></p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
* </span>检查当前进程的退出是否会造成任何进程组变成孤儿进程组。如果</p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
* </span>有，并且有处于停止状态（<span lang=EN-US>TASK_STOPPED</span>）的组员，则向它们发送</p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
* </span>一个<span lang=EN-US>SIGHUP</span>信号和一个<span lang=EN-US>SIGCONT</span>信号。（<span
|
||
lang=EN-US>POSIX 3.2.2.2</span>节要求）</p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
* </span></p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
* </span>情况<span lang=EN-US>1</span>：我们的父进程在另外一个与我们不同的进程组中，而本进程</p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
* </span>是我们与外界的唯一联系。所以我们的进程组将变成一个孤儿进程组。</p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
*/</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // POSIX 3.2.2.2</span>（<span lang=EN-US>1991</span>版）是关于<span lang=EN-US>exit()</span>函数的说明。如果父进程所在的进程组与当前进程的</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>不同，但都处于同一个会话（<span
|
||
lang=EN-US>session</span>）中，并且当前进程所在进程组将要变成孤儿进程了并且</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>当前进程的进程组中含有处于停止状态的作业（进程），那么就要向这个当前进程的进程组发</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>送两个信号：<span
|
||
lang=EN-US>SIGHUP</span>和<span lang=EN-US>SIGCONT</span>。发送这两个信号的原因见<span
|
||
lang=EN-US>232</span>行前的说明。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>291</span></u><span
|
||
lang=EN-US> if ((<u><span
|
||
style='color:blue'>current</span></u>->p_pptr->pgrp != <u><span
|
||
style='color:blue'>current</span></u>->pgrp) &&</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>292</span></u><span
|
||
lang=EN-US>
|
||
(<u><span style='color:blue'>current</span></u>->p_pptr->session == <u><span
|
||
style='color:blue'>current</span></u>->session) &&</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>293</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>is_orphaned_pgrp</span></u>(<u><span
|
||
style='color:blue'>current</span></u>->pgrp) &&</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>294</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>has_stopped_jobs</span></u>(<u><span
|
||
style='color:blue'>current</span></u>->pgrp)) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>295</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>kill_pg</span></u>(<u><span style='color:blue'>current</span></u>->pgrp,<u><span
|
||
style='color:blue'>SIGHUP</span></u>,1);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>296</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>kill_pg</span></u>(<u><span style='color:blue'>current</span></u>->pgrp,<u><span
|
||
style='color:blue'>SIGCONT</span></u>,1);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>297</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>298</span></u><span
|
||
lang=EN-US> <b><i>/* Let father
|
||
know we died */</i></b> /* </span>通知父进程当前进程将终止<span
|
||
lang=EN-US> */</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>299</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>current</span></u>->p_pptr->signal |= (1<<(<u><span
|
||
style='color:blue'>SIGCHLD</span></u>-1));</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>300</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>301</span></u><span
|
||
lang=EN-US> <b><i>/*</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>302</span></u><span
|
||
lang=EN-US> <b><i> * This
|
||
loop does two things:</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>303</span></u><span
|
||
lang=EN-US> <b><i> * </i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>304</span></u><span
|
||
lang=EN-US> <b><i> *
|
||
A. Make init inherit all the child processes</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>305</span></u><span
|
||
lang=EN-US> <b><i> * B.
|
||
Check to see if any process groups have become orphaned</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>306</span></u><span
|
||
lang=EN-US> <b><i> *
|
||
as a result of our exiting, and if they have any stopped</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>307</span></u><span
|
||
lang=EN-US> <b><i> *
|
||
jons, send them a SIGUP and then a SIGCONT. (POSIX 3.2.2.2)</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>308</span></u><span
|
||
lang=EN-US> <b><i> */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
/* </span></p>
|
||
|
||
<p class=a><span lang=EN-US> *
|
||
</span>下面的循环做了两件事情：</p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
* </span></p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
* A. </span>让<span lang=EN-US>init</span>进程继承当前进程所有子进程。</p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
* B. </span>检查当前进程的退出是否会造成任何进程组变成孤儿进程组。如果</p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
* </span>有，并且有处于停止状态（<span lang=EN-US>TASK_STOPPED</span>）的组员，则向它们发送</p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
* </span>一个<span lang=EN-US>SIGHUP</span>信号和一个<span
|
||
lang=EN-US>SIGCONT</span>信号。（<span lang=EN-US>POSIX 3.2.2.2</span>节要求）</p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
*/</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果当前进程有子进程（其<span
|
||
lang=EN-US>p_cptr</span>指针指向最近创建的子进程），则让进程<span lang=EN-US>1</span>（<span
|
||
lang=EN-US>init</span>进程）</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>成为其所有子进程的父进程。如果子进程已经处于僵死状态，则向<span
|
||
lang=EN-US>init</span>进程（父进程）发送</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>子进程已终止信号<span
|
||
lang=EN-US>SIGCHLD</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>309</span></u><span
|
||
lang=EN-US> if (p = <u><span
|
||
style='color:blue'>current</span></u>->p_cptr) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>310</span></u><span
|
||
lang=EN-US>
|
||
while (1) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>311</span></u><span
|
||
lang=EN-US>
|
||
p->p_pptr = <u><span style='color:blue'>task</span></u>[1];</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>312</span></u><span
|
||
lang=EN-US>
|
||
if (p-><u><span style='color:blue'>state</span></u> == <u><span
|
||
style='color:blue'>TASK_ZOMBIE</span></u>)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>313</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>task</span></u>[1]->signal |= (1<<(<u><span
|
||
style='color:blue'>SIGCHLD</span></u>-1));</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>314</span></u><span
|
||
lang=EN-US>
|
||
<b><i>/*</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>315</span></u><span
|
||
lang=EN-US> <b><i> *
|
||
process group orphan check</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>316</span></u><span
|
||
lang=EN-US> <b><i> *
|
||
Case ii: Our child is in a different pgrp </i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>317</span></u><span
|
||
lang=EN-US> <b><i> *
|
||
than we are, and it was the only connection</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>318</span></u><span
|
||
lang=EN-US> <b><i> *
|
||
outside, so the child pgrp is now orphaned.</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>319</span></u><span
|
||
lang=EN-US> <b><i> */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
/* </span>孤儿进程组检测。</p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
* </span>情况<span lang=EN-US>2</span>：我们的子进程在不同的进程组中，而本进程</p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
* </span>是它们唯一与外界的连接。因此现在子进程所在进程</p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
* </span>组将变成孤儿进程组了。</p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
*/</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果子进程与当前进程不在同一个进程组中但属于同一个<span
|
||
lang=EN-US>session</span>中，并且当前进程所在进程</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>组将要变成孤儿进程了，并且当前进程的进程组中含有处于停止状态的作业（进程），那么就</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>要向这个当前进程的进程组发送两个信号：<span
|
||
lang=EN-US>SIGHUP</span>和<span lang=EN-US>SIGCONT</span>。<span lang=EN-US>
|
||
</span>如果该子进程有兄弟进程，</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>则继续循环处理这些兄弟进程。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>320</span></u><span
|
||
lang=EN-US>
|
||
if ((p->pgrp != <u><span style='color:blue'>current</span></u>->pgrp)
|
||
&&</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>321</span></u><span
|
||
lang=EN-US>
|
||
(p->session == <u><span style='color:blue'>current</span></u>->session)
|
||
&&</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>322</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>is_orphaned_pgrp</span></u>(p->pgrp) &&</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>323</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>has_stopped_jobs</span></u>(p->pgrp)) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>324</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>kill_pg</span></u>(p->pgrp,<u><span
|
||
style='color:blue'>SIGHUP</span></u>,1);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>325</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>kill_pg</span></u>(p->pgrp,<u><span
|
||
style='color:blue'>SIGCONT</span></u>,1);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>326</span></u><span
|
||
lang=EN-US>
|
||
}</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>327</span></u><span
|
||
lang=EN-US>
|
||
if (p->p_osptr) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>328</span></u><span
|
||
lang=EN-US>
|
||
p = p->p_osptr;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>329</span></u><span
|
||
lang=EN-US>
|
||
continue;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>330</span></u><span
|
||
lang=EN-US>
|
||
}</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>331</span></u><span
|
||
lang=EN-US>
|
||
<b><i>/*</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>332</span></u><span
|
||
lang=EN-US> <b><i> *
|
||
This is it; link everything into init's children </i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>333</span></u><span
|
||
lang=EN-US> <b><i> *
|
||
and leave </i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>334</span></u><span
|
||
lang=EN-US> <b><i> */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
/* </span></p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
* </span>就这样：将所有子进程链接成为<span lang=EN-US>init</span>的子进程并退出循环。</p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
*/</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>通过上面处理，当前进程子进程的所有兄弟子进程都已经处理过。此时<span
|
||
lang=EN-US>p</span>指向最老的兄弟子</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>进程。于是把这些兄弟子进程全部加入<span
|
||
lang=EN-US>init</span>进程的子进程双向链表头部中。加入后，<span lang=EN-US>init</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>进程的<span lang=EN-US>p_cptr
|
||
</span>指向当前进程原子进程中最年轻的（<span lang=EN-US>the youngest</span>）子进程，而原子进程中</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>最老的（<span lang=EN-US>the
|
||
oldest</span>）兄弟子进程<span lang=EN-US> p_osptr </span>指向原<span lang=EN-US> init</span>进程的最年轻进程，而原<span
|
||
lang=EN-US>init</span>进</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>程中最年轻进程的<span
|
||
lang=EN-US> p_ysptr</span>指向原子进程中最老的兄弟子进程。最后把当前进程的<span lang=EN-US>p_cptr</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>指针置空，并退出循环。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>335</span></u><span
|
||
lang=EN-US>
|
||
p->p_osptr = <u><span style='color:blue'>task</span></u>[1]->p_cptr;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>336</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>task</span></u>[1]->p_cptr->p_ysptr = p;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>337</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>task</span></u>[1]->p_cptr = <u><span
|
||
style='color:blue'>current</span></u>->p_cptr;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>338</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>current</span></u>->p_cptr = 0;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>339</span></u><span
|
||
lang=EN-US>
|
||
break;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>340</span></u><span
|
||
lang=EN-US>
|
||
}</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>341</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果当前进程是会话头领<span
|
||
lang=EN-US>(leader)</span>进程，那么若它有控制终端，则首先向使用该控制终端的</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>进程组发送挂断信号<span
|
||
lang=EN-US>SIGHUP</span>，然后释放该终端。接着扫描任务数组，把属于当前进程会话中</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>进程的终端置空（取消）。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>342</span></u><span
|
||
lang=EN-US> if (<u><span
|
||
style='color:blue'>current</span></u>->leader) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>343</span></u><span
|
||
lang=EN-US>
|
||
struct <u><span style='color:blue'>task_struct</span></u> **p;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>344</span></u><span
|
||
lang=EN-US>
|
||
struct <u><span style='color:blue'>tty_struct</span></u> *tty;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>345</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>346</span></u><span
|
||
lang=EN-US>
|
||
if (<u><span style='color:blue'>current</span></u>->tty >= 0) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>347</span></u><span
|
||
lang=EN-US>
|
||
tty = <u><span style='color:blue'>TTY_TABLE</span></u>(<u><span
|
||
style='color:blue'>current</span></u>->tty);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>348</span></u><span
|
||
lang=EN-US>
|
||
if (tty->pgrp>0)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>349</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>kill_pg</span></u>(tty->pgrp, <u><span
|
||
style='color:blue'>SIGHUP</span></u>, 1);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>350</span></u><span
|
||
lang=EN-US>
|
||
tty->pgrp = 0;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>351</span></u><span
|
||
lang=EN-US>
|
||
tty->session = 0;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>352</span></u><span
|
||
lang=EN-US>
|
||
}</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>353</span></u><span
|
||
lang=EN-US>
|
||
for (p = &<u><span style='color:blue'>LAST_TASK</span></u> ; p > &<u><span
|
||
style='color:blue'>FIRST_TASK</span></u> ; --p)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>354</span></u><span
|
||
lang=EN-US>
|
||
if
|
||
((*p)->session == <u><span style='color:blue'>current</span></u>->session)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>355</span></u><span
|
||
lang=EN-US>
|
||
(*p)->tty = -1;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>356</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果当前进程上次使用过协处理器，则把记录此信息的指针置空。若定义了调试进程树符号，</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>则调用进程树检测显示函数。最后调用调度函数，重新调度进程运行，以让父进程能够处理</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>僵死进程的其它善后事宜。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>357</span></u><span
|
||
lang=EN-US> if (<u><span
|
||
style='color:blue'>last_task_used_math</span></u> == <u><span style='color:
|
||
blue'>current</span></u>)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>358</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>last_task_used_math</span></u> = <u><span
|
||
style='color:blue'>NULL</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>359</span></u><span
|
||
lang=EN-US> #ifdef <u><span style='color:blue'>DEBUG_PROC_TREE</span></u></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>360</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>audit_ptree</span></u>();</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>361</span></u><span
|
||
lang=EN-US> #endif</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>362</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>schedule</span></u>();</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>363</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>364</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>系统调用<span lang=EN-US>exit()</span>。终止进程。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数<span lang=EN-US>error_code</span>是用户程序提供的退出状态信息，只有低字节有效。把<span
|
||
lang=EN-US>error_code</span>左移<span lang=EN-US>8</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>比特是<span lang=EN-US>
|
||
wait() </span>或<span lang=EN-US> waitpid()</span>函数的要求。低字节中将用来保存<span
|
||
lang=EN-US>wait()</span>的状态信息。例如，</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果进程处于暂停状态（<span
|
||
lang=EN-US>TASK_STOPPED</span>），那么其低字节就等于<span lang=EN-US> 0x7f</span>。参见<span
|
||
lang=EN-US> sys/wait.h</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>文件第<span lang=EN-US>13--19</span>行。
|
||
<span lang=EN-US>wait() </span>或<span lang=EN-US>waitpid() </span>利用这些宏就可以取得子进程的退出状态码或子</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>进程终止的原因（信号）。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>365</span></u><span
|
||
lang=EN-US> int <u><span style='color:blue'>sys_exit</span></u>(int error_code)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>366</span></u><span
|
||
lang=EN-US> {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>367</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>do_exit</span></u>((error_code&0xff)<<8);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>368</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>369</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>系统调用<span lang=EN-US>waitpid()</span>。挂起当前进程，直到<span
|
||
lang=EN-US>pid </span>指定的子进程退出（终止）或者收到要求终止</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>该进程的信号，或者是需要调用一个信号句柄（信号处理程序）。如果<span
|
||
lang=EN-US>pid</span>所指的子进程早已</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>退出（已成所谓的僵死进程），则本调用将立刻返回。子进程使用的所有资源将释放。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果<span lang=EN-US>pid
|
||
> 0</span>，表示等待进程号等于<span lang=EN-US>pid</span>的子进程。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果<span lang=EN-US>pid
|
||
= 0</span>，表示等待进程组号等于当前进程组号的任何子进程。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果<span lang=EN-US>pid
|
||
< -1</span>，表示等待进程组号等于<span lang=EN-US>pid</span>绝对值的任何子进程。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果<span lang=EN-US>pid
|
||
= -1</span>，表示等待任何子进程。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>若<span lang=EN-US>options
|
||
= WUNTRACED</span>，表示如果子进程是停止的，也马上返回（无须跟踪）。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>若<span lang=EN-US>options
|
||
= WNOHANG</span>，表示如果没有子进程退出或终止就马上返回。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果返回状态指针<span
|
||
lang=EN-US>stat_addr</span>不为空，则就将状态信息保存到那里。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数<span lang=EN-US>pid</span>是进程号；<span
|
||
lang=EN-US>*stat_addr</span>是保存状态信息位置的指针；<span lang=EN-US>options</span>是<span
|
||
lang=EN-US>waitpid</span>选项。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>370</span></u><span
|
||
lang=EN-US> int <u><span style='color:blue'>sys_waitpid</span></u>(<u><span
|
||
style='color:blue'>pid_t</span></u> pid,unsigned long * stat_addr, int options)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>371</span></u><span
|
||
lang=EN-US> {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>372</span></u><span
|
||
lang=EN-US> int flag;
|
||
// </span>该标志用于后面表示所选出的子进程处于就绪或睡眠态。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>373</span></u><span
|
||
lang=EN-US> struct <u><span
|
||
style='color:blue'>task_struct</span></u> *p;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>374</span></u><span
|
||
lang=EN-US> unsigned long
|
||
oldblocked;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>375</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>首先验证将要存放状态信息的位置处内存空间足够。然后复位标志<span
|
||
lang=EN-US>flag</span>。接着从当前进程的最</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>年轻子进程开始扫描子进程兄弟链表。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>376</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>verify_area</span></u>(stat_addr,4);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>377</span></u><span
|
||
lang=EN-US> repeat:</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>378</span></u><span
|
||
lang=EN-US> flag=0;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>379</span></u><span
|
||
lang=EN-US> for (p = <u><span
|
||
style='color:blue'>current</span></u>->p_cptr ; p ; p = p->p_osptr) {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果等待的子进程号<span
|
||
lang=EN-US>pid>0</span>，但与被扫描子进程<span lang=EN-US>p</span>的<span lang=EN-US>pid</span>不相等，说明它是当前进程另外的子</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>进程，于是跳过该进程，接着扫描下一个进程。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>380</span></u><span
|
||
lang=EN-US>
|
||
if (pid>0) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>381</span></u><span
|
||
lang=EN-US>
|
||
if (p->pid != pid)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>382</span></u><span
|
||
lang=EN-US>
|
||
continue;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>否则，如果指定等待进程的<span
|
||
lang=EN-US>pid=0</span>，表示正在等待进程组号等于当前进程组号的任何子进程。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果此时被扫描进程<span
|
||
lang=EN-US>p</span>的进程组号与当前进程的组号不等，则跳过。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>383</span></u><span
|
||
lang=EN-US>
|
||
} else if (!pid) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>384</span></u><span
|
||
lang=EN-US>
|
||
if (p->pgrp != <u><span style='color:blue'>current</span></u>->pgrp)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>385</span></u><span
|
||
lang=EN-US>
|
||
continue;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>否则，如果指定的<span
|
||
lang=EN-US>pid < -1</span>，表示正在等待进程组号等于<span lang=EN-US>pid</span>绝对值的任何子进程。如果此时</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>被扫描进程<span lang=EN-US>p</span>的组号与<span
|
||
lang=EN-US>pid</span>的绝对值不等，则跳过。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>386</span></u><span
|
||
lang=EN-US>
|
||
} else if (pid != -1) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>387</span></u><span
|
||
lang=EN-US>
|
||
if (p->pgrp != -pid)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>388</span></u><span
|
||
lang=EN-US>
|
||
continue;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>389</span></u><span
|
||
lang=EN-US>
|
||
}</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果前<span lang=EN-US>3</span>个对<span
|
||
lang=EN-US>pid</span>的判断都不符合，则表示当前进程正在等待其任何子进程，也即<span lang=EN-US>pid = -1</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>的情况。此时所选择到的进程 <span
|
||
lang=EN-US>p </span>或者是其进程号等于指定 <span lang=EN-US>pid</span>，或者是当前进程组中的任何</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>子进程，或者是进程号等于指定 <span
|
||
lang=EN-US>pid </span>绝对值的子进程，或者是任何子进程（此时指定的 <span lang=EN-US>pid</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>等于 <span lang=EN-US>-1</span>）。接下来根据这个子进程<span
|
||
lang=EN-US>p</span>所处的状态来处理。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>当子进程<span lang=EN-US>p
|
||
</span>处于停止状态时，如果此时参数选项<span lang=EN-US>options</span>中<span lang=EN-US>WUNTRACED
|
||
</span>标志没有置位，表示</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>程序无须立刻返回，或者子进程此时的退出码等于<span
|
||
lang=EN-US> 0</span>，于是继续扫描处理其他子进程。 如果</p>
|
||
|
||
<p class=a><span lang=EN-US> // WUNTRACED</span>置位且子进程退出码不为<span
|
||
lang=EN-US>0</span>，则把退出码移入高字节，或上状态信息 <span lang=EN-US>0x7f </span>后放入</p>
|
||
|
||
<p class=a><span lang=EN-US> // *stat_addr</span>，在复位子进程退出码后就立刻返回子进程号<span
|
||
lang=EN-US>pid</span>。这里<span lang=EN-US>0x7f </span>表示的返回状态使</p>
|
||
|
||
<p class=a><span lang=EN-US> // WIFSTOPPED()</span>宏为真。参见<span
|
||
lang=EN-US>include/sys/wait.h</span>，<span lang=EN-US>14</span>行。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>390</span></u><span
|
||
lang=EN-US>
|
||
switch (p-><u><span style='color:blue'>state</span></u>) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>391</span></u><span
|
||
lang=EN-US>
|
||
case <u><span style='color:blue'>TASK_STOPPED</span></u>:</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>392</span></u><span
|
||
lang=EN-US>
|
||
if (!(options & <u><span style='color:blue'>WUNTRACED</span></u>) || </span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>393</span></u><span
|
||
lang=EN-US> !p->exit_code)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>394</span></u><span
|
||
lang=EN-US>
|
||
continue;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>395</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>put_fs_long</span></u>((p->exit_code << 8)
|
||
| 0x7f,</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>396</span></u><span
|
||
lang=EN-US>
|
||
stat_addr);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>397</span></u><span
|
||
lang=EN-US>
|
||
p->exit_code = 0;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>398</span></u><span
|
||
lang=EN-US>
|
||
return p->pid;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果子进程<span lang=EN-US>p</span>处于僵死状态，则首先把它在用户态和内核态运行的时间分别累计到当前进程</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>（父进程）中，然后取出子进程的<span
|
||
lang=EN-US>pid</span>和退出码，把退出码放入返回状态位置<span lang=EN-US>stat_addr</span>处</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>并释放该子进程。最后返回子进程的退出码和<span
|
||
lang=EN-US>pid</span>。 若定义了调试进程树符号，则调用进程</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>树检测显示函数。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>399</span></u><span
|
||
lang=EN-US>
|
||
case <u><span style='color:blue'>TASK_ZOMBIE</span></u>:</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>400</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>current</span></u>->cutime += p-><u><span
|
||
style='color:blue'>utime</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>401</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>current</span></u>->cstime += p-><u><span
|
||
style='color:blue'>stime</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>402</span></u><span
|
||
lang=EN-US>
|
||
flag = p->pid;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>403</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>put_fs_long</span></u>(p->exit_code,
|
||
stat_addr);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>404</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>release</span></u>(p);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>405</span></u><span
|
||
lang=EN-US> #ifdef <u><span style='color:blue'>DEBUG_PROC_TREE</span></u></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>406</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>audit_ptree</span></u>();</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>407</span></u><span
|
||
lang=EN-US> #endif</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>408</span></u><span
|
||
lang=EN-US>
|
||
return flag;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果这个子进程<span
|
||
lang=EN-US>p</span>的状态既不是停止也不是僵死，那么就置<span lang=EN-US>flag = 1</span>。表示找到过一个符合</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>要求的子进程，但是它处于运行态或睡眠态。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>409</span></u><span
|
||
lang=EN-US>
|
||
default:</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>410</span></u><span
|
||
lang=EN-US>
|
||
flag=1;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>411</span></u><span
|
||
lang=EN-US>
|
||
continue;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>412</span></u><span
|
||
lang=EN-US>
|
||
}</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>413</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>在上面对任务数组扫描结束后，如果<span
|
||
lang=EN-US> flag</span>被置位，说明有符合等待要求的子进程并没有处</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>于退出或僵死状态。此时如果已设置<span
|
||
lang=EN-US>WNOHANG</span>选项（表示若没有子进程处于退出或终止态就</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>立刻返回），就立刻返回<span
|
||
lang=EN-US>0</span>，退出。否则把当前进程置为可中断等待状态并，保留并修改</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>当前进程信号阻塞位图，允许其接收到<span
|
||
lang=EN-US>SIGCHLD</span>信号。然后执行调度程序。当系统又开始</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>执行本进程时，如果本进程收到除<span
|
||
lang=EN-US>SIGCHLD</span>以外的其他未屏蔽信号，则以退出码“重新启</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>动系统调用”返回。否则跳转到函数开始处<span
|
||
lang=EN-US>repeat</span>标号处重复处理。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>414</span></u><span
|
||
lang=EN-US> if (flag) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>415</span></u><span
|
||
lang=EN-US>
|
||
if (options & <u><span style='color:blue'>WNOHANG</span></u>)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>416</span></u><span
|
||
lang=EN-US>
|
||
return 0;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>417</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>current</span></u>-><u><span style='color:blue'>state</span></u>=<u><span
|
||
style='color:blue'>TASK_INTERRUPTIBLE</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>418</span></u><span
|
||
lang=EN-US>
|
||
oldblocked = <u><span style='color:blue'>current</span></u>->blocked;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>419</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>current</span></u>->blocked &= ~(1<<(<u><span
|
||
style='color:blue'>SIGCHLD</span></u>-1));</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>420</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>schedule</span></u>();</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>421</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>current</span></u>->blocked = oldblocked;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>422</span></u><span
|
||
lang=EN-US>
|
||
if (<u><span style='color:blue'>current</span></u>->signal & ~(<u><span
|
||
style='color:blue'>current</span></u>->blocked | (1<<(<u><span
|
||
style='color:blue'>SIGCHLD</span></u>-1))))</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>423</span></u><span
|
||
lang=EN-US>
|
||
return -<u><span style='color:blue'>ERESTARTSYS</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>424</span></u><span
|
||
lang=EN-US>
|
||
else</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>425</span></u><span
|
||
lang=EN-US>
|
||
goto repeat;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>426</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>若<span lang=EN-US>flag
|
||
= 0</span>，表示没有找到符合要求的子进程，则返回出错码（子进程不存在）。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>427</span></u><span
|
||
lang=EN-US> return -<u><span
|
||
style='color:blue'>ECHILD</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>428</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>429</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<div class=a align=center style='text-align:center'><span lang=EN-US>
|
||
|
||
<hr size=4 width="100%" align=center>
|
||
|
||
</span></div>
|
||
|
||
<p class=MsoNormal><span lang=EN-US> </span></p>
|
||
|
||
<p class=MsoNormal><span lang=EN-US> </span></p>
|
||
|
||
</div>
|
||
|
||
</body>
|
||
|
||
</html>
|