github.com/afumu/libc@v0.0.6/musl/src/misc/getrusage.c (about)

     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  }