granicus.if.org Git - postgresql/blob - src/backend/port/getrusage.c

   1 /* $Id: getrusage.c,v 1.4 1998/02/01 00:02:59 scrappy Exp $ */
   2
   3 #include <math.h>               /* for pow() prototype */
   4
   5 #include <errno.h>
   6 #include "rusagestub.h"
   7 #include "port-protos.h"
   8
   9 #if 0 /* this is from univel port ... how does compiler define? */
  10       /* same for i386_solaris port ... how does compiler define? */
  11       /* same for sco port ... how does compiler define? */
  12       /* same for sparc_solaris port ... how does compiler define? */
  13       /* same for svr4 port ... how does compiler define? */
  14 int
  15 getrusage(int who, struct rusage * rusage)
  16 {
  17         struct tms      tms;
  18         register int tick_rate = CLK_TCK;       /* ticks per second */
  19         clock_t         u,
  20                                 s;
  21
  22         if (rusage == (struct rusage *) NULL)
  23         {
  24                 errno = EFAULT;
  25                 return (-1);
  26         }
  27         if (times(&tms) < 0)
  28         {
  29                 /* errno set by times */
  30                 return (-1);
  31         }
  32         switch (who)
  33         {
  34                 case RUSAGE_SELF:
  35                         u = tms.tms_utime;
  36                         s = tms.tms_stime;
  37                         break;
  38                 case RUSAGE_CHILDREN:
  39                         u = tms.tms_cutime;
  40                         s = tms.tms_cstime;
  41                         break;
  42                 default:
  43                         errno = EINVAL;
  44                         return (-1);
  45         }
  46 #define TICK_TO_SEC(T, RATE)    ((T)/(RATE))
  47 #define TICK_TO_USEC(T,RATE)    (((T)%(RATE)*1000000)/RATE)
  48         rusage->ru_utime.tv_sec = TICK_TO_SEC(u, tick_rate);
  49         rusage->ru_utime.tv_usec = TICK_TO_USEC(u, tick_rate);
  50         rusage->ru_stime.tv_sec = TICK_TO_SEC(s, tick_rate);
  51         rusage->ru_stime.tv_usec = TICK_TO_USEC(u, tick_rate);
  52         return (0);
  53 }
  54 #endif
  55
  56 #if 0 /* this is for hpux port ... how does compiler define? */
  57 getrusage(int who, struct rusage * ru)
  58 {
  59     return (syscall(SYS_GETRUSAGE, who, ru));
  60 }
  61 #endif