lang/cem/libcc.ansi/time/clock.c

   1 /*
   2  * clock - determine the processor time used
   3  */
   4 /* $Id: clock.c,v 1.4 1994/06/24 11:58:00 ceriel Exp $ */
   5
   6 #include        <time.h>
   7
   8 #if     defined(__BSD4_2)
   9
  10 struct timeval {
  11         long    tv_sec;                 /* seconds */
  12         long    tv_usec;                /* and microseconds */
  13 };
  14
  15 #define RUSAGE_SELF     0
  16 #define RUSAGE_CHILDREN -1
  17
  18 struct rusage {
  19         struct timeval ru_utime;        /* user time used */
  20         struct timeval ru_stime;        /* system time used */
  21         long    ru_maxrss;
  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 context switches */
  35 };
  36
  37 void _getrusage(int who, struct rusage *rusage);
  38
  39 #elif   defined(_POSIX_SOURCE) || defined(__USG)
  40
  41 struct tms {
  42         time_t  tms_utime;              /* user time */
  43         time_t  tms_stime;              /* system time */
  44         time_t  tms_cutime;             /* user time, children */
  45         time_t  tms_cstime;             /* system time, children */
  46 };
  47
  48 long _times(struct tms *buffer);
  49
  50 #else                                   /* Version 7 UNIX */
  51
  52 struct tbuffer {
  53         long proc_user_time;
  54         long proc_system_time;
  55         long child_user_time;
  56         long child_system_time;
  57 };
  58
  59 long _times(struct tbuffer *buffer);
  60
  61 #endif
  62
  63 clock_t
  64 clock(void)
  65 {
  66 #if     defined(__BSD4_2)
  67         struct rusage rusage;
  68
  69         _getrusage(RUSAGE_SELF, &rusage);
  70
  71         return (((unsigned long)rusage.ru_utime.tv_sec * CLOCKS_PER_SEC)
  72                 + rusage.ru_utime.tv_usec);
  73 #elif   defined(_POSIX_SOURCE) || defined(__USG)
  74         struct tms tms;
  75
  76         _times(&tms);
  77         /* Assume that time_t can be converted to clock_t for Sys5 */
  78         return tms.tms_utime;
  79 #else
  80         struct tbuffer tbuffer;
  81
  82         _times(&tbuffer);
  83         return tbuffer.proc_user_time;
  84 #endif
  85 }