1#define _GNU_SOURCE
2#include <pwd.h>
3#include <stdio.h>
4#include <unistd.h>
5
6char *cuserid(char *buf)
7{
8	struct passwd pw, *ppw;
9	long pwb[256];
10	if (getpwuid_r(geteuid(), &pw, (void *)pwb, sizeof pwb, &ppw))
11		return 0;
12	snprintf(buf, L_cuserid, "%s", pw.pw_name);
13	return buf;
14}
15