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28b176085f
Update to latest gnulib with new copyright year. Run "make update-copyright" and then... * gnulib: Update included in this commit as copyright years are the only change from the previous gnulib commit. * tests/init.sh: Sync with gnulib to pick up copyright year. * bootstrap: Likewise. * tests/sample-test: Adjust to use the single most recent year.
149 lines
3.5 KiB
C
149 lines
3.5 KiB
C
/* GNU's users.
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Copyright (C) 1992-2025 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 3 of the License, or
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(at your option) 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, see <https://www.gnu.org/licenses/>. */
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/* Written by jla; revised by djm */
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#include <config.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 "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 \
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proper_name ("Joseph Arceneaux"), \
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proper_name ("David MacKenzie")
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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 (idx_t n, struct gl_utmp const *this)
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{
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char **u = xinmalloc (n, sizeof *u);
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idx_t i;
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idx_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 (char const *filename, int options)
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{
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idx_t n_users;
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struct gl_utmp *utmp_buf;
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options |= READ_UTMP_USER_PROCESS;
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if (read_utmp (filename, &n_users, &utmp_buf, options) != 0)
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error (EXIT_FAILURE, errno, "%s", quotef (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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emit_try_help ();
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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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emit_ancillary_info (PROGRAM_NAME);
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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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set_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_gnu_standard_options_only (argc, argv, PROGRAM_NAME, PACKAGE_NAME,
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Version, true, usage, AUTHORS,
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(char const *) nullptr);
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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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return EXIT_SUCCESS;
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}
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