��14-12 linux/include/unistd.h

1 #ifndef _UNISTD_H

2 #define _UNISTD_H

4 /* ok, this may be a joke, but I'm working on it */

/* ok, ��Ҳ��Ǹ��Ц��ִ�� */

// ��ų��ָ��IEEE��׼1003.1ʵ�ֵİ汾�ţ��һ��ֵ��

5 #define _POSIX_VERSION 198808L

// chown()��fchown()��ʹ��ڽ��̵�Ȩ�ޡ�/* ֻ�г��û��ִ��chown��..��*/

7 #define _POSIX_CHOWN_RESTRICTED /* only root can do a chown (I think..) */

// ��(NAME_MAX)��·��󣬶��Զ��ضϡ�/* ·��ضϣ��뿴�ں˴��룩*/

8 #define _POSIX_NO_TRUNC /* no pathname truncation (but see in kernel) */

// ��Ž��ַ�ֵ��ֵ��ֹ�ն˶��Ĵ��/* ��ֹ��^C��ַ� */

// _POSIX_VDISABLE��ڿ��ն�ĳЩ��ַ��Ĺ��ܡ��һ��ն�termios�ṹ��c_cc[]

// ��ĳ��ַ��ֵ��_POSIX_VDISABLE��ֵʱ��ʾ��ֹʹ��Ӧ��ַ��

9 #define _POSIX_VDISABLE '\0' /* character to disable things like ^C */

// ϵͳʵ��֧��ҵ��ơ�

10 #define _POSIX_JOB_CONTROL

// ÿ��̶��һ��set-user-ID��һ��set-group-ID�� /* �Ѿ�ʵ�֡� */

11 #define _POSIX_SAVED_IDS /* Implemented, for whatever good it is */

13 #define STDIN_FILENO 0 // ��׼��ļ��š�

14 #define STDOUT_FILENO 1 // ��׼��ļ��š�

15 #define STDERR_FILENO 2 // ��׼��ļ��š�

17 #ifndef NULL

18 #define NULL ((void *)0) // ��ָ�롣

19 #endif

21 /* access */ /* �ļ�� */

// ��¶��ķ��ų��access()��

22 #define F_OK 0 // ��ļ��Ƿ��ڡ�

23 #define X_OK 1 // ��Ƿ��ִ�У��

24 #define W_OK 2 // ��Ƿ��д��

25 #define R_OK 4 // ��Ƿ�ɶ��

27 /* lseek */ /* �ļ�ָ��ض�λ */

// ��·��ų��lseek()��fcntl()��

28 #define SEEK_SET 0 // ��ļ��дָ��Ϊƫ��ֵ��

29 #define SEEK_CUR 1 // ��ļ��дָ��Ϊ��ǰֵ��ƫ��ֵ��

30 #define SEEK_END 2 // ��ļ��дָ��Ϊ�ļ��ȼ��ƫ��ֵ��

32 /* _SC stands for System Configuration. We don't use them much */

/* _SC��ʾϵͳ��á��Ǻ��ʹ�� */

// ��ķ��ų��sysconf()��

33 #define _SC_ARG_MAX 1 // ��

34 #define _SC_CHILD_MAX 2 // �ӽ��

35 #define _SC_CLOCKS_PER_SEC 3 // ÿ��δ��

36 #define _SC_NGROUPS_MAX 4 // ��

37 #define _SC_OPEN_MAX 5 // ��ļ��

38 #define _SC_JOB_CONTROL 6 // ��ҵ��ơ�

39 #define _SC_SAVED_IDS 7 // ��ı�ʶ��

40 #define _SC_VERSION 8 // �汾��

42 /* more (possibly) configurable things - now pathnames */

/* ��ģ��ܵģ��ò�� - ��·�� */

// ��ķ��ų��pathconf()��

43 #define _PC_LINK_MAX 1 // ��

44 #define _PC_MAX_CANON 2 // ��󳣹��ļ��

45 #define _PC_MAX_INPUT 3 // ��볤�ȡ�

46 #define _PC_NAME_MAX 4 // ��󳤶ȡ�

47 #define _PC_PATH_MAX 5 // ·��󳤶ȡ�

48 #define _PC_PIPE_BUF 6 // �ܵ��С��

49 #define _PC_NO_TRUNC 7 // �ļ��ضϡ�

50 #define _PC_VDISABLE 8 //

51 #define _PC_CHOWN_RESTRICTED 9 // �ı��ޡ�

53 #include <sys/stat.h> // �ļ�״̬ͷ�ļ��ļ��ļ�ϵͳ״̬�ṹstat{}�ͳ��

54 #include <sys/time.h>

55 #include <sys/times.h> // ��˽��ʱ��ṹtms�Լ�times()��ԭ�͡�

56 #include <sys/utsname.h> // ϵͳ��ƽṹͷ�ļ��

57 #include <sys/resource.h>

58 #include <utime.h> // �û�ʱ��ͷ�ļ��˷��ʺ��޸�ʱ��ṹ�Լ�utime()ԭ�͡�

60 #ifdef __LIBRARY__

// ��ʵ�ֵ�ϵͳ��÷��ų��ϵͳ��ú��ֵ(�μ�include/linux/sys.h) ��

62 #define __NR_setup 0 /* used only by init, to get system going */

63 #define __NR_exit 1 /* __NR_setup��ڳ�ʼ��ϵͳ */

64 #define __NR_fork 2

65 #define __NR_read 3

66 #define __NR_write 4

67 #define __NR_open 5

68 #define __NR_close 6

69 #define __NR_waitpid 7

70 #define __NR_creat 8

71 #define __NR_link 9

72 #define __NR_unlink 10

73 #define __NR_execve 11

74 #define __NR_chdir 12

75 #define __NR_time 13

76 #define __NR_mknod 14

77 #define __NR_chmod 15

78 #define __NR_chown 16

79 #define __NR_break 17

80 #define __NR_stat 18

81 #define __NR_lseek 19

82 #define __NR_getpid 20

83 #define __NR_mount 21

84 #define __NR_umount 22

85 #define __NR_setuid 23

86 #define __NR_getuid 24

87 #define __NR_stime 25

88 #define __NR_ptrace 26

89 #define __NR_alarm 27

90 #define __NR_fstat 28

91 #define __NR_pause 29

92 #define __NR_utime 30

93 #define __NR_stty 31

94 #define __NR_gtty 32

95 #define __NR_access 33

96 #define __NR_nice 34

97 #define __NR_ftime 35

98 #define __NR_sync 36

99 #define __NR_kill 37

100 #define __NR_rename 38

101 #define __NR_mkdir 39

102 #define __NR_rmdir 40

103 #define __NR_dup 41

104 #define __NR_pipe 42

105 #define __NR_times 43

106 #define __NR_prof 44

107 #define __NR_brk 45

108 #define __NR_setgid 46

109 #define __NR_getgid 47

110 #define __NR_signal 48

111 #define __NR_geteuid 49

112 #define __NR_getegid 50

113 #define __NR_acct 51

114 #define __NR_phys 52

115 #define __NR_lock 53

116 #define __NR_ioctl 54

117 #define __NR_fcntl 55

118 #define __NR_mpx 56

119 #define __NR_setpgid 57

120 #define __NR_ulimit 58

121 #define __NR_uname 59

122 #define __NR_umask 60

123 #define __NR_chroot 61

124 #define __NR_ustat 62

125 #define __NR_dup2 63

126 #define __NR_getppid 64

127 #define __NR_getpgrp 65

128 #define __NR_setsid 66

129 #define __NR_sigaction 67

130 #define __NR_sgetmask 68

131 #define __NR_ssetmask 69

132 #define __NR_setreuid 70

133 #define __NR_setregid 71

134 #define __NR_sigsuspend 72

135 #define __NR_sigpending 73

136 #define __NR_sethostname 74

137 #define __NR_setrlimit 75

138 #define __NR_getrlimit 76

139 #define __NR_getrusage 77

140 #define __NR_gettimeofday 78

141 #define __NR_settimeofday 79

142 #define __NR_getgroups 80

143 #define __NR_setgroups 81

144 #define __NR_select 82

145 #define __NR_symlink 83

146 #define __NR_lstat 84

147 #define __NR_readlink 85

148 #define __NR_uselib 86

149

// ��¶��ϵͳ��Ƕ��ʽ��꺯��

// ��ϵͳ��ú꺯��type name(void)��

// %0 - eax(__res)��%1 - eax(__NR_##name)��name��ϵͳ��õ��ƣ�� __NR_ ��γ��

// ��ϵͳ��÷��ų��Ӷ��ϵͳ��ñ��к��ָ��Ѱַ��

// ��أ��ֵ��ڵ��0��򷵻ظ�ֵ��ó��errno��-1��

// �ں궨��У��Ƿ��֮��ľ��'##'��ʾ�ں��滻ʱ��

// ��һ��139��ϵ�__NR_##name��滻�˲��name��fork��֮��

// ��ڳ��г��ֵĽ��Ƿ��__NR_fork��μ��The C Programming Language��¼A.12.3��

150 #define _syscall0(type,name) \

151 type name(void) \

152 { \

153 long __res; \

154 __asm__ volatile ("int $0x80" \ // ��ϵͳ�ж�0x80��

155 : "=a" (__res) \ // ��ֵ��eax(__res)��

156 : "0" (__NR_##name)); \ // ��Ϊϵͳ�жϵ��ú�__NR_name��

157 if (__res >= 0) \ // ��ֵ>=0��ֱ�ӷ��ظ�ֵ��

158 return (type) __res; \

159 errno = -__res; \ // ��ó��ţ��-1��

160 return -1; \

161 }

162

// ��1��ϵͳ��ú꺯��type name(atype a)

// %0 - eax(__res)��%1 - eax(__NR_name)��%2 - ebx(a)��

163 #define _syscall1(type,name,atype,a) \

164 type name(atype a) \

165 { \

166 long __res; \

167 __asm__ volatile ("int $0x80" \

168 : "=a" (__res) \

169 : "0" (__NR_##name),"b" ((long)(a))); \

170 if (__res >= 0) \

171 return (type) __res; \

172 errno = -__res; \

173 return -1; \

174 }

175

// ��2��ϵͳ��ú꺯��type name(atype a, btype b)

// %0 - eax(__res)��%1 - eax(__NR_name)��%2 - ebx(a)��%3 - ecx(b)��

176 #define _syscall2(type,name,atype,a,btype,b) \

177 type name(atype a,btype b) \

178 { \

179 long __res; \

180 __asm__ volatile ("int $0x80" \

181 : "=a" (__res) \

182 : "0" (__NR_##name),"b" ((long)(a)),"c" ((long)(b))); \

183 if (__res >= 0) \

184 return (type) __res; \

185 errno = -__res; \

186 return -1; \

187 }

188

// ��3��ϵͳ��ú꺯��type name(atype a, btype b, ctype c)

// %0 - eax(__res)��%1 - eax(__NR_name)��%2 - ebx(a)��%3 - ecx(b)��%4 - edx(c)��

189 #define _syscall3(type,name,atype,a,btype,b,ctype,c) \

190 type name(atype a,btype b,ctype c) \

191 { \

192 long __res; \

193 __asm__ volatile ("int $0x80" \

194 : "=a" (__res) \

195 : "0" (__NR_##name),"b" ((long)(a)),"c" ((long)(b)),"d" ((long)(c))); \

196 if (__res>=0) \

197 return (type) __res; \

198 errno=-__res; \

199 return -1; \

200 }

201

202 #endif /* __LIBRARY__ */

203

204 extern int errno; // ��ţ�ȫ�ֱ��

205

// ��Ӧ��ϵͳ��õĺ��ԭ�Ͷ��塣(��ϸ˵��μ�include/linux/sys.h )

206 int access(const char * filename, mode_t mode);

207 int acct(const char * filename);

208 int alarm(int sec);

209 int brk(void * end_data_segment);

210 void * sbrk(ptrdiff_t increment);

211 int chdir(const char * filename);

212 int chmod(const char * filename, mode_t mode);

213 int chown(const char * filename, uid_t owner, gid_t group);

214 int chroot(const char * filename);

215 int close(int fildes);

216 int creat(const char * filename, mode_t mode);

217 int dup(int fildes);

218 int execve(const char * filename, char ** argv, char ** envp);

219 int execv(const char * pathname, char ** argv);

220 int execvp(const char * file, char ** argv);

221 int execl(const char * pathname, char * arg0, ...);

222 int execlp(const char * file, char * arg0, ...);

223 int execle(const char * pathname, char * arg0, ...);

// ��ǰ�Ĺؼ��volatile��ڸ��߱��gcc�ú��᷵�ء��gcc��һ

// Щ�Ĵ��룬��Ҫ��ʹ��ؼ��ֿ��Ա��ĳЩ��δ��ʼ��ģ��پ��Ϣ��

// ��ͬ��gcc�ĺ��˵��void do_exit(int error_code) __attribute__ ((noreturn));

224 volatile void exit(int status);

225 volatile void _exit(int status);

226 int fcntl(int fildes, int cmd, ...);

227 int fork(void);

228 int getpid(void);

229 int getuid(void);

230 int geteuid(void);

231 int getgid(void);

232 int getegid(void);

233 int ioctl(int fildes, int cmd, ...);

234 int kill(pid_t pid, int signal);

235 int link(const char * filename1, const char * filename2);

236 int lseek(int fildes, off_t offset, int origin);

237 int mknod(const char * filename, mode_t mode, dev_t dev);

238 int mount(const char * specialfile, const char * dir, int rwflag);

239 int nice(int val);

240 int open(const char * filename, int flag, ...);

241 int pause(void);

242 int pipe(int * fildes);

243 int read(int fildes, char * buf, off_t count);

244 int setpgrp(void);

245 int setpgid(pid_t pid,pid_t pgid);

246 int setuid(uid_t uid);

247 int setgid(gid_t gid);

248 void (*signal(int sig, void (*fn)(int)))(int);

249 int stat(const char * filename, struct stat * stat_buf);

250 int fstat(int fildes, struct stat * stat_buf);

251 int stime(time_t * tptr);

252 int sync(void);

253 time_t time(time_t * tloc);

254 time_t times(struct tms * tbuf);

255 int ulimit(int cmd, long limit);

256 mode_t umask(mode_t mask);

257 int umount(const char * specialfile);

258 int uname(struct utsname * name);

259 int unlink(const char * filename);

260 int ustat(dev_t dev, struct ustat * ubuf);

261 int utime(const char * filename, struct utimbuf * times);

262 pid_t waitpid(pid_t pid,int * wait_stat,int options);

263 pid_t wait(int * wait_stat);

264 int write(int fildes, const char * buf, off_t count);

265 int dup2(int oldfd, int newfd);

266 int getppid(void);

267 pid_t getpgrp(void);

268 pid_t setsid(void);

269 int sethostname(char *name, int len);

270 int setrlimit(int resource, struct rlimit *rlp);

271 int getrlimit(int resource, struct rlimit *rlp);

272 int getrusage(int who, struct rusage *rusage);

273 int gettimeofday(struct timeval *tv, struct timezone *tz);

274 int settimeofday(struct timeval *tv, struct timezone *tz);

275 int getgroups(int gidsetlen, gid_t *gidset);

276 int setgroups(int gidsetlen, gid_t *gidset);

277 int select(int width, fd_set * readfds, fd_set * writefds,

278 fd_set * exceptfds, struct timeval * timeout);

279

280 #endif

281