mirror of
https://git.savannah.gnu.org/git/coreutils.git
synced 2025-09-10 07:59:52 +02:00
155 lines
3.6 KiB
C
155 lines
3.6 KiB
C
/* GNU's users.
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Copyright (C) 1992-2005 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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/* Written by jla; revised by djm */
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#include <config.h>
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#include <getopt.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include "system.h"
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#include "error.h"
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#include "long-options.h"
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#include "quote.h"
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#include "readutmp.h"
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/* The official name of this program (e.g., no `g' prefix). */
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#define PROGRAM_NAME "users"
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#define AUTHORS "Joseph Arceneaux", "David MacKenzie"
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/* The name this program was run with. */
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char *program_name;
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static int
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userid_compare (const void *v_a, const void *v_b)
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{
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char **a = (char **) v_a;
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char **b = (char **) v_b;
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return strcmp (*a, *b);
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}
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static void
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list_entries_users (size_t n, const STRUCT_UTMP *this)
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{
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char **u = xnmalloc (n, sizeof *u);
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size_t i;
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size_t n_entries = 0;
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while (n--)
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{
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if (IS_USER_PROCESS (this))
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{
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char *trimmed_name;
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trimmed_name = extract_trimmed_name (this);
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u[n_entries] = trimmed_name;
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++n_entries;
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}
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this++;
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}
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qsort (u, n_entries, sizeof (u[0]), userid_compare);
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for (i = 0; i < n_entries; i++)
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{
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char c = (i < n_entries - 1 ? ' ' : '\n');
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fputs (u[i], stdout);
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putchar (c);
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}
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for (i = 0; i < n_entries; i++)
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free (u[i]);
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free (u);
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}
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/* Display a list of users on the system, according to utmp file FILENAME.
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Use read_utmp OPTIONS to read FILENAME. */
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static void
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users (const char *filename, int options)
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{
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size_t n_users;
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STRUCT_UTMP *utmp_buf;
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if (read_utmp (filename, &n_users, &utmp_buf, options) != 0)
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error (EXIT_FAILURE, errno, "%s", filename);
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list_entries_users (n_users, utmp_buf);
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free (utmp_buf);
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}
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void
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usage (int status)
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{
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if (status != EXIT_SUCCESS)
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fprintf (stderr, _("Try `%s --help' for more information.\n"),
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program_name);
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else
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{
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printf (_("Usage: %s [OPTION]... [ FILE ]\n"), program_name);
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printf (_("\
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Output who is currently logged in according to FILE.\n\
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If FILE is not specified, use %s. %s as FILE is common.\n\
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\n\
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"),
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UTMP_FILE, WTMP_FILE);
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fputs (HELP_OPTION_DESCRIPTION, stdout);
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fputs (VERSION_OPTION_DESCRIPTION, stdout);
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printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
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}
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exit (status);
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}
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int
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main (int argc, char **argv)
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{
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initialize_main (&argc, &argv);
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program_name = argv[0];
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setlocale (LC_ALL, "");
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bindtextdomain (PACKAGE, LOCALEDIR);
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textdomain (PACKAGE);
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atexit (close_stdout);
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parse_long_options (argc, argv, PROGRAM_NAME, GNU_PACKAGE, VERSION,
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usage, AUTHORS, (char const *) NULL);
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if (getopt_long (argc, argv, "", NULL, NULL) != -1)
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usage (EXIT_FAILURE);
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switch (argc - optind)
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{
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case 0: /* users */
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users (UTMP_FILE, READ_UTMP_CHECK_PIDS);
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break;
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case 1: /* users <utmp file> */
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users (argv[optind], 0);
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break;
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default: /* lose */
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error (0, 0, _("extra operand %s"), quote (argv[optind + 1]));
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usage (EXIT_FAILURE);
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}
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exit (EXIT_SUCCESS);
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}
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