getrusage.c raw

   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  }
  36