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-rw-r--r--libc/manual/examples/db.c52
1 files changed, 52 insertions, 0 deletions
diff --git a/libc/manual/examples/db.c b/libc/manual/examples/db.c
new file mode 100644
index 000000000..1a1cb0c0d
--- /dev/null
+++ b/libc/manual/examples/db.c
@@ -0,0 +1,52 @@
+#include <grp.h>
+#include <pwd.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <stdlib.h>
+
+int
+main (void)
+{
+ uid_t me;
+ struct passwd *my_passwd;
+ struct group *my_group;
+ char **members;
+
+ /* Get information about the user ID. */
+ me = getuid ();
+ my_passwd = getpwuid (me);
+ if (!my_passwd)
+ {
+ printf ("Couldn't find out about user %d.\n", (int) me);
+ exit (EXIT_FAILURE);
+ }
+
+ /* Print the information. */
+ printf ("I am %s.\n", my_passwd->pw_gecos);
+ printf ("My login name is %s.\n", my_passwd->pw_name);
+ printf ("My uid is %d.\n", (int) (my_passwd->pw_uid));
+ printf ("My home directory is %s.\n", my_passwd->pw_dir);
+ printf ("My default shell is %s.\n", my_passwd->pw_shell);
+
+ /* Get information about the default group ID. */
+ my_group = getgrgid (my_passwd->pw_gid);
+ if (!my_group)
+ {
+ printf ("Couldn't find out about group %d.\n",
+ (int) my_passwd->pw_gid);
+ exit (EXIT_FAILURE);
+ }
+
+ /* Print the information. */
+ printf ("My default group is %s (%d).\n",
+ my_group->gr_name, (int) (my_passwd->pw_gid));
+ printf ("The members of this group are:\n");
+ members = my_group->gr_mem;
+ while (*members)
+ {
+ printf (" %s\n", *(members));
+ members++;
+ }
+
+ return EXIT_SUCCESS;
+}