| 1 | /* User and Group Database Example |
|---|
| 2 | Copyright (C) 1991-2022 Free Software Foundation, Inc. |
|---|
| 3 | |
|---|
| 4 | This program is free software; you can redistribute it and/or |
|---|
| 5 | modify it under the terms of the GNU General Public License |
|---|
| 6 | as published by the Free Software Foundation; either version 2 |
|---|
| 7 | of the License, or (at your option) any later version. |
|---|
| 8 | |
|---|
| 9 | This program is distributed in the hope that it will be useful, |
|---|
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
|---|
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
|---|
| 12 | GNU General Public License for more details. |
|---|
| 13 | |
|---|
| 14 | You should have received a copy of the GNU General Public License |
|---|
| 15 | along with this program; if not, see <https://www.gnu.org/licenses/>. |
|---|
| 16 | */ |
|---|
| 17 | |
|---|
| 18 | #include <grp.h> |
|---|
| 19 | #include <pwd.h> |
|---|
| 20 | #include <sys/types.h> |
|---|
| 21 | #include <unistd.h> |
|---|
| 22 | #include <stdlib.h> |
|---|
| 23 | |
|---|
| 24 | int |
|---|
| 25 | main (void) |
|---|
| 26 | { |
|---|
| 27 | uid_t me; |
|---|
| 28 | struct passwd *my_passwd; |
|---|
| 29 | struct group *my_group; |
|---|
| 30 | char **members; |
|---|
| 31 | |
|---|
| 32 | /* Get information about the user ID. */ |
|---|
| 33 | me = getuid (); |
|---|
| 34 | my_passwd = getpwuid (uid: me); |
|---|
| 35 | if (!my_passwd) |
|---|
| 36 | { |
|---|
| 37 | printf ("Couldn't find out about user %d.\n" , (int) me); |
|---|
| 38 | exit (EXIT_FAILURE); |
|---|
| 39 | } |
|---|
| 40 | |
|---|
| 41 | /* Print the information. */ |
|---|
| 42 | printf ("I am %s.\n" , my_passwd->pw_gecos); |
|---|
| 43 | printf ("My login name is %s.\n" , my_passwd->pw_name); |
|---|
| 44 | printf ("My uid is %d.\n" , (int) (my_passwd->pw_uid)); |
|---|
| 45 | printf ("My home directory is %s.\n" , my_passwd->pw_dir); |
|---|
| 46 | printf ("My default shell is %s.\n" , my_passwd->pw_shell); |
|---|
| 47 | |
|---|
| 48 | /* Get information about the default group ID. */ |
|---|
| 49 | my_group = getgrgid (gid: my_passwd->pw_gid); |
|---|
| 50 | if (!my_group) |
|---|
| 51 | { |
|---|
| 52 | printf ("Couldn't find out about group %d.\n" , |
|---|
| 53 | (int) my_passwd->pw_gid); |
|---|
| 54 | exit (EXIT_FAILURE); |
|---|
| 55 | } |
|---|
| 56 | |
|---|
| 57 | /* Print the information. */ |
|---|
| 58 | printf ("My default group is %s (%d).\n" , |
|---|
| 59 | my_group->gr_name, (int) (my_passwd->pw_gid)); |
|---|
| 60 | printf ("The members of this group are:\n" ); |
|---|
| 61 | members = my_group->gr_mem; |
|---|
| 62 | while (*members) |
|---|
| 63 | { |
|---|
| 64 | printf (" %s\n" , *(members)); |
|---|
| 65 | members++; |
|---|
| 66 | } |
|---|
| 67 | |
|---|
| 68 | return EXIT_SUCCESS; |
|---|
| 69 | } |
|---|
| 70 | |
|---|
