1#define _GNU_SOURCE
 2#include <sys/wait.h>
 3#include <sys/resource.h>
 4#include <string.h>
 5#include <errno.h>
 6#include "syscall.h"
 7
 8pid_t wait4(pid_t pid, int *status, int options, struct rusage *ru)
 9{
10	int r;
11#ifdef SYS_wait4_time64
12	if (ru) {
13		long long kru64[18];
14		r = __syscall(SYS_wait4_time64, pid, status, options, kru64);
15		if (r > 0) {
16			ru->ru_utime = (struct timeval)
17				{ .tv_sec = kru64[0], .tv_usec = kru64[1] };
18			ru->ru_stime = (struct timeval)
19				{ .tv_sec = kru64[2], .tv_usec = kru64[3] };
20			char *slots = (char *)&ru->ru_maxrss;
21			for (int i=0; i<14; i++)
22				*(long *)(slots + i*sizeof(long)) = kru64[4+i];
23		}
24		if (SYS_wait4_time64 == SYS_wait4 || r != -ENOSYS)
25			return __syscall_ret(r);
26	}
27#endif
28	char *dest = ru ? (char *)&ru->ru_maxrss - 4*sizeof(long) : 0;
29	r = __sys_wait4(pid, status, options, dest);
30	if (r>0 && ru && sizeof(time_t) > sizeof(long)) {
31		long kru[4];
32		memcpy(kru, dest, 4*sizeof(long));
33		ru->ru_utime = (struct timeval)
34			{ .tv_sec = kru[0], .tv_usec = kru[1] };
35		ru->ru_stime = (struct timeval)
36			{ .tv_sec = kru[2], .tv_usec = kru[3] };
37	}
38	return __syscall_ret(r);
39}