05/musl-0.6.0/src/unistd/setuid.c


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#include <unistd.h>
#include "syscall.h"
#include "libc.h"

int setuid(uid_t uid)
{
	if (libc.rsyscall) return libc.rsyscall(__NR_setuid, uid, 0, 0, 0, 0, 0);
	return syscall1(__NR_setuid, uid);
}