1 /* hostname - set or print the name of current host system
2 Copyright (C) 94, 1995 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
18 /* Jim Meyering <meyering@comco.com> */
22 #include <sys/types.h>
26 #include "long-options.h"
29 #if !defined(HAVE_SETHOSTNAME) && defined(HAVE_SYSINFO) && \
30 defined (HAVE_SYS_SYSTEMINFO_H) && defined(HAVE_LIMITS_H)
32 #include <sys/systeminfo.h>
35 sethostname (name, namelen)
39 /* Using sysinfo() is the SVR4 mechanism to set a hostname. */
42 result = sysinfo (SI_SET_HOSTNAME, name, namelen);
44 return (result == -1 ? result : 0);
47 #define HAVE_SETHOSTNAME 1 /* Now we have it... */
50 char *xgethostname ();
52 /* The name this program was run with. */
60 fprintf (stderr, "Try `%s --help' for more information.\n",
68 --help display this help and exit\n\
69 --version output version information and exit\n\
71 , program_name, program_name);
83 program_name = argv[0];
85 parse_long_options (argc, argv, "hostname", version_string, usage);
87 #ifdef HAVE_SETHOSTNAME
92 /* Set hostname to argv[1]. */
93 err = sethostname (argv[1], strlen (argv[1]));
95 error (1, errno, "%s", argv[1]);
100 error (1, 0, "cannot set hostname; this system lacks the functionality");
105 hostname = xgethostname ();
106 if (hostname == NULL)
107 error (1, errno, "cannot determine hostname");
108 printf ("%s\n", hostname);
112 error (2, 0, "too many arguments");