����14-30 linux/include/sys/resource.h

  1 /*

  2  * Resource control/accounting header file for linux

  3  */

    /*

     * Linux��Դ����/���ͷ�ļ���

  4

  5 #ifndef _SYS_RESOURCE_H

  6 #define _SYS_RESOURCE_H

  7

    // ���·��ų����ͽṹ����getrusage()���μ�kernel/sys.c�ļ���412�п�ʼ��

  8 /*

  9  * Definition of struct rusage taken from BSD 4.3 Reno

 10  *

 11  * We don't support all of these yet, but we might as well have them....

 12  * Otherwise, each time we add new items, programs which depend on this

 13  * structure will lose.  This reduces the chances of that happening.

 14  */

    /*

     * rusage�ṹ�Ķ���ȡ��BSD 4.3 Renoϵͳ��

     *

     * �������ڻ�û��֧�ָýṹ�е�������Щ�ֶΣ������ǿ��ܻ�֧�����ǵ�....

     * ����Ļ���ÿ�����������µ��ֶΣ���Щ����������ṹ�ij���ͻ�����⡣

     * ���ڰ������ֶζ����������Ϳ��Ա����������鷢����

     */

    // ������getrusage()�IJ���who��ʹ�õķ��ų�����

 15 #define RUSAGE_SELF     0     // ���ص�ǰ���̵���Դ������Ϣ��

 16 #define RUSAGE_CHILDREN -1    // ���ص�ǰ��������ֹ�͵ȴ��ŵ��ӽ��̵���Դ������Ϣ��

 17

    // rusage�ǽ��̵���Դ����ͳ�ƽṹ������getrusage()����ָ�����̶���Դ���õ�ͳ��ֵ��

    // Linux 0.12�ں˽�ʹ����ǰ�����ֶΣ����Ƕ���timeval�ṹ��include/sys/time.h����

    // ru_utime �C �������û�̬����ʱ��ͳ��ֵ��ru_stime �C �������ں�̬����ʱ��ͳ��ֵ��

 18 struct  rusage {

 19         struct timeval ru_utime;        /* user time used */

 20         struct timeval ru_stime;        /* system time used */

 21         long    ru_maxrss;              /* maximum resident set size */

 22         long    ru_ixrss;               /* integral shared memory size */

 23         long    ru_idrss;               /* integral unshared data size */

 24         long    ru_isrss;               /* integral unshared stack size */

 25         long    ru_minflt;              /* page reclaims */

 26         long    ru_majflt;              /* page faults */

 27         long    ru_nswap;               /* swaps */

 28         long    ru_inblock;             /* block input operations */

 29         long    ru_oublock;             /* block output operations */

 30         long    ru_msgsnd;              /* messages sent */

 31         long    ru_msgrcv;              /* messages received */

 32         long    ru_nsignals;            /* signals received */

 33         long    ru_nvcsw;               /* voluntary context switches */

 34         long    ru_nivcsw;              /* involuntary " */

 35 };

 36

    // ������getrlimit()��setrlimit()ʹ�õķ��ų����ͽṹ��

 37 /*

 38  * Resource limits

 39  */

    /*

     * ��Դ���ơ�

     */

    // ������Linux 0.12�ں������������Դ���࣬��getrlimit()��setrlimit()�е�1������

    // resource ��ȡֵ��Χ�� ��ʵ��Щ���ų������ǽ�������ṹ�� rlim[] �����������ֵ��

    // rlim[]�����ÿһ���һ��rlimit�ṹ���ýṹ�������58�С�

 40

 41 #define RLIMIT_CPU      0          /* CPU time in ms */        /* ʹ�õ�CPUʱ�� */

 42 #define RLIMIT_FSIZE    1          /* Maximum filesize */      /* ����ļ����� */

 43 #define RLIMIT_DATA     2          /* max data size */         /* ������ݳ��� */

 44 #define RLIMIT_STACK    3          /* max stack size */        /* ���ջ���� */

 45 #define RLIMIT_CORE     4          /* max core file size */    /* ���core�ļ����� */

 46 #define RLIMIT_RSS      5          /* max resident set size */ /* ���פ������С */

 47

    // ��������˷���notdef����Ҳ�������·��ų������塣

 48 #ifdef notdef

 49 #define RLIMIT_MEMLOCK  6          /* max locked-in-memory address space*/ /* ������ */

 50 #define RLIMIT_NPROC    7          /* max number of processes */   /* ����ӽ����� */

 51 #define RLIMIT_OFILE    8          /* max number of open files */  /* �����ļ��� */

 52 #endif

 53

    // ������ų���������Linux�����Ƶ���Դ���ࡣRLIM_NLIMITS=6����˽�ǰ��6����Ч��

 54 #define RLIM_NLIMITS    6

 55

    // ��ʾ��Դ���ޣ������޸ġ�

 56 #define RLIM_INFINITY   0x7fffffff

 57

    // ��Դ���޽ṹ��

 58 struct rlimit {

 59         int     rlim_cur;          // ��ǰ��Դ���ƣ���������ƣ�soft limit����

 60         int     rlim_max;          // Ӳ���ƣ�hard limit����

 61 };

 62

 63 #endif /* _SYS_RESOURCE_H */

 64