src/misc/getrusage.c

   1 #include <sys/resource.h>
   2 #include <string.h>
   3 #include <errno.h>
   4 #include "syscall.h"
   5
   6 int getrusage(int who, struct rusage *ru)
   7 {
   8         int r;
   9 #ifdef SYS_getrusage_time64
  10         long long kru64[18];
  11         r = __syscall(SYS_getrusage_time64, who, kru64);
  12         if (!r) {
  13                 ru->ru_utime = (struct timeval)
  14                         { .tv_sec = kru64[0], .tv_usec = kru64[1] };
  15                 ru->ru_stime = (struct timeval)
  16                         { .tv_sec = kru64[2], .tv_usec = kru64[3] };
  17                 char *slots = (char *)&ru->ru_maxrss;
  18                 for (int i=0; i<14; i++)
  19                         *(long *)(slots + i*sizeof(long)) = kru64[4+i];
  20         }
  21         if (SYS_getrusage_time64 == SYS_getrusage || r != -ENOSYS)
  22                 return __syscall_ret(r);
  23 #endif
  24         char *dest = (char *)&ru->ru_maxrss - 4*sizeof(long);
  25         r = __syscall(SYS_getrusage, who, dest);
  26         if (!r && sizeof(time_t) > sizeof(long)) {
  27                 long kru[4];
  28                 memcpy(kru, dest, 4*sizeof(long));
  29                 ru->ru_utime = (struct timeval)
  30                         { .tv_sec = kru[0], .tv_usec = kru[1] };
  31                 ru->ru_stime = (struct timeval)
  32                         { .tv_sec = kru[2], .tv_usec = kru[3] };
  33         }
  34         return __syscall_ret(r);
  35 }