1#define _GNU_SOURCE
 2#include <pwd.h>
 3#include <stdio.h>
 4
 5int putpwent(const struct passwd *pw, FILE *f)
 6{
 7	return fprintf(f, "%s:%s:%u:%u:%s:%s:%s\n",
 8		pw->pw_name, pw->pw_passwd, pw->pw_uid, pw->pw_gid,
 9		pw->pw_gecos, pw->pw_dir, pw->pw_shell)<0 ? -1 : 0;
10}