mailing list of musl libc

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 #define _GNU_SOURCE
#include <sys/time.h>
#include "syscall.h"

int futimesat(int dirfd, const char *pathname, const struct timeval times[2])
{
#ifdef SYS_futimesat
	return syscall(SYS_futimesat, dirfd, pathname, times);
#else
	struct timespec ts[2];
	if (times) {
		ts[0].tv_sec = times[0].tv_sec;
		ts[0].tv_nsec = times[0].tv_usec * 1000;
		ts[1].tv_sec = times[1].tv_sec;
		ts[1].tv_nsec = times[1].tv_usec * 1000;
	}
	return syscall(SYS_utimensat, dirfd, pathname, times ? ts : 0, 0);
#endif
}