grp/testgrp.c

   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
   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   exit (my_passwd && my_group ? EXIT_SUCCESS : EXIT_FAILURE);
  41 }