1 #include <grp.h>
2 #include <pwd.h>
3 #include <sys/types.h>
4 #include <unistd.h>
5 #include <stdlib.h>
6 #include <stdio.h>
7
8 int
main(int argc,char * argv[])9 main (int argc, char *argv[])
10 {
11 uid_t me;
12 struct passwd *my_passwd;
13 struct group *my_group = NULL;
14 char **members;
15
16 me = getuid ();
17 my_passwd = getpwuid (me);
18 if (my_passwd == NULL)
19 printf ("Cannot find user entry for UID %d\n", me);
20 else
21 {
22 printf ("My login name is %s.\n", my_passwd->pw_name);
23 printf ("My uid is %d.\n", (int)(my_passwd->pw_uid));
24 printf ("My home directory is %s.\n", my_passwd->pw_dir);
25 printf ("My default shell is %s.\n", my_passwd->pw_shell);
26
27 my_group = getgrgid (my_passwd->pw_gid);
28 if (my_group == NULL)
29 printf ("No data for group %d found\n", my_passwd->pw_gid);
30 else
31 {
32 printf ("My default group is %s (%d).\n",
33 my_group->gr_name, (int)(my_passwd->pw_gid));
34 printf ("The members of this group are:\n");
35 for (members = my_group->gr_mem; *members != NULL; ++members)
36 printf (" %s\n", *members);
37 }
38 }
39
40 return my_passwd && my_group ? EXIT_SUCCESS : EXIT_FAILURE;
41 }
42