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Diffstat (limited to 'src/hostname.c')
-rw-r--r-- | src/hostname.c | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/src/hostname.c b/src/hostname.c new file mode 100644 index 0000000..f6748a6 --- /dev/null +++ b/src/hostname.c @@ -0,0 +1,125 @@ +/* hostname - set or print the name of current host system + Copyright (C) 1994-1997, 1999-2005 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software Foundation, + Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ + +/* Written by Jim Meyering. */ + +#include <config.h> +#include <getopt.h> +#include <stdio.h> +#include <sys/types.h> + +#include "system.h" +#include "long-options.h" +#include "error.h" +#include "quote.h" +#include "xgethostname.h" + +/* The official name of this program (e.g., no `g' prefix). */ +#define PROGRAM_NAME "hostname" + +#define AUTHORS "Jim Meyering" + +#if HAVE_SETHOSTNAME && !defined sethostname +int sethostname (); +#endif + +#if !defined HAVE_SETHOSTNAME && defined HAVE_SYSINFO && \ + defined HAVE_SYS_SYSTEMINFO_H +# include <sys/systeminfo.h> + +int +sethostname (char *name, size_t namelen) +{ + /* Using sysinfo() is the SVR4 mechanism to set a hostname. */ + return (sysinfo (SI_SET_HOSTNAME, name, namelen) < 0 ? -1 : 0); +} + +# define HAVE_SETHOSTNAME 1 /* Now we have it... */ +#endif + +/* The name this program was run with. */ +char *program_name; + +void +usage (int status) +{ + if (status != EXIT_SUCCESS) + fprintf (stderr, _("Try `%s --help' for more information.\n"), + program_name); + else + { + printf (_("\ +Usage: %s [NAME]\n\ + or: %s OPTION\n\ +Print or set the hostname of the current system.\n\ +\n\ +"), + program_name, program_name); + fputs (HELP_OPTION_DESCRIPTION, stdout); + fputs (VERSION_OPTION_DESCRIPTION, stdout); + printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT); + } + exit (status); +} + +int +main (int argc, char **argv) +{ + char *hostname; + + initialize_main (&argc, &argv); + program_name = argv[0]; + setlocale (LC_ALL, ""); + bindtextdomain (PACKAGE, LOCALEDIR); + textdomain (PACKAGE); + + atexit (close_stdout); + + parse_long_options (argc, argv, PROGRAM_NAME, GNU_PACKAGE, VERSION, + usage, AUTHORS, (char const *) NULL); + if (getopt_long (argc, argv, "", NULL, NULL) != -1) + usage (EXIT_FAILURE); + + if (argc == optind + 1) + { +#ifdef HAVE_SETHOSTNAME + /* Set hostname to operand. */ + char const *name = argv[optind]; + if (sethostname (name, strlen (name)) != 0) + error (EXIT_FAILURE, errno, _("cannot set name to %s"), quote (name)); +#else + error (EXIT_FAILURE, 0, + _("cannot set hostname; this system lacks the functionality")); +#endif + } + + if (argc <= optind) + { + hostname = xgethostname (); + if (hostname == NULL) + error (EXIT_FAILURE, errno, _("cannot determine hostname")); + printf ("%s\n", hostname); + } + + if (optind + 1 < argc) + { + error (0, 0, _("extra operand %s"), quote (argv[optind + 1])); + usage (EXIT_FAILURE); + } + + exit (EXIT_SUCCESS); +} |