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