| Erik Andersen | 3163821 | 2000-01-15 22:28:50 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Mini whoami implementation for busybox |
| 3 | * |
| 4 | * Copyright (C) 2000 Edward Betts <edward@debian.org>. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | * General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 19 | * |
| 20 | */ |
| 21 | |
| 22 | #include "internal.h" |
| 23 | #include <stdio.h> |
| 24 | #include <pwd.h> |
| 25 | |
| 26 | static const char whoami_usage[] = "whoami\n\n" |
| 27 | "Print the user name associated with the current effective user id.\n" |
| 28 | "Same as id -un.\n"; |
| 29 | |
| 30 | extern int whoami_main(int argc, char **argv) { |
| 31 | struct passwd *pw; |
| 32 | uid_t uid; |
| 33 | |
| 34 | if (argc > 1) usage (whoami_usage); |
| 35 | |
| 36 | uid = geteuid (); |
| 37 | pw = getpwuid (uid); |
| 38 | if (pw) { |
| 39 | puts (pw->pw_name); |
| 40 | exit (TRUE); |
| 41 | } |
| 42 | fprintf (stderr, "%s: cannot find username for UID %u\n", argv[0], (unsigned) uid); |
| 43 | exit (FALSE); |
| 44 | } |