]>
Commit | Line | Data |
---|---|---|
d9a17c07 | 1 | /* User and Group Database Example |
dff8da6b | 2 | Copyright (C) 1991-2024 Free Software Foundation, Inc. |
d9a17c07 RM |
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 | |
5a82c748 | 15 | along with this program; if not, see <https://www.gnu.org/licenses/>. |
d9a17c07 RM |
16 | */ |
17 | ||
28f540f4 RM |
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 (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 (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 | } |