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71ea30a742
NULL is best for C as discussed at: https://bugs.gnu.org/66221#53 * bootstrap.conf: Remove dependency on nullptr. * s/nullptr/NULL/.
113 lines
2.9 KiB
C
113 lines
2.9 KiB
C
/* hostname - set or print the name of current host system
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Copyright (C) 1994-2026 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 Jim Meyering. */
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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 "xgethostname.h"
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/* The official name of this program (e.g., no 'g' prefix). */
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#define PROGRAM_NAME "hostname"
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#define AUTHORS proper_name ("Jim Meyering")
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#ifndef HAVE_SETHOSTNAME
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# if defined HAVE_SYSINFO && defined HAVE_SYS_SYSTEMINFO_H
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# include <sys/systeminfo.h>
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# endif
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static int
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sethostname (char const *name, size_t namelen)
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{
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# if defined HAVE_SYSINFO && defined HAVE_SYS_SYSTEMINFO_H
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/* Using sysinfo() is the SVR4 mechanism to set a hostname. */
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return (sysinfo (SI_SET_HOSTNAME, name, namelen) < 0 ? -1 : 0);
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# else
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errno = ENOTSUP;
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return -1;
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# endif
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}
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#endif
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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 (_("\
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Usage: %s [NAME]\n\
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or: %s OPTION\n\
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Print or set the hostname of the current system.\n\
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\n\
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"),
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program_name, program_name);
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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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char *hostname;
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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 *) NULL);
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if (optind + 1 < argc)
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{
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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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if (optind + 1 == argc)
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{
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/* Set hostname to operand. */
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char const *name = argv[optind];
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if (sethostname (name, strlen (name)) != 0)
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error (EXIT_FAILURE, errno, _("cannot set name to %s"),
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quote (name));
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}
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else
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{
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hostname = xgethostname ();
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if (hostname == NULL)
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error (EXIT_FAILURE, errno, _("cannot determine hostname"));
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puts (hostname);
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}
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main_exit (EXIT_SUCCESS);
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}
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