1 #define _GNU_SOURCE
2 #include <pwd.h>
3 #include <stdio.h>
4 #include <unistd.h>
5 
cuserid(char * buf)6 char *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