2.11BSD#431 - /usr/src/bin/hostname/hostname.c

   1: /*
   2:  * Copyright (c) 1988, 1993
   3:  *	The Regents of the University of California.  All rights reserved.
   4:  *
   5:  * Redistribution and use in source and binary forms, with or without
   6:  * modification, are permitted provided that the following conditions
   7:  * are met:
   8:  * 1. Redistributions of source code must retain the above copyright
   9:  *    notice, this list of conditions and the following disclaimer.
  10:  * 2. Redistributions in binary form must reproduce the above copyright
  11:  *    notice, this list of conditions and the following disclaimer in the
  12:  *    documentation and/or other materials provided with the distribution.
  13:  * 3. All advertising materials mentioning features or use of this software
  14:  *    must display the following acknowledgement:
  15:  *	This product includes software developed by the University of
  16:  *	California, Berkeley and its contributors.
  17:  * 4. Neither the name of the University nor the names of its contributors
  18:  *    may be used to endorse or promote products derived from this software
  19:  *    without specific prior written permission.
  20:  *
  21:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31:  * SUCH DAMAGE.
  32:  *
  33:  *	hostname.c,v 1.2 1994/09/24 02:55:40 davidg Exp
  34:  */
  35: 
  36: #if defined(DOSCCS) & !defined(lint)
  37: static char copyright[] =
  38: "@(#) Copyright (c) 1988, 1993\n\
  39: 	The Regents of the University of California.  All rights reserved.\n";
  40: #endif /* not lint */
  41: 
  42: #if defined(DOSCCS) & !defined(lint)
  43: static char sccsid[] = "@(#)hostname.c	8.1.1 (R.Birch) 8/2/95";
  44: #endif /* not lint */
  45: 
  46: #include <sys/param.h>
  47: 
  48: #include <stdio.h>
  49: #include <string.h>
  50: 
  51: int
  52: main(argc,argv)
  53:     int argc;
  54:     char *argv[];
  55: {
  56:     extern int optind;
  57:     int ch, sflag;
  58:     char *p, hostname[MAXHOSTNAMELEN];
  59: 
  60:     sflag = 0;
  61:     while ((ch = getopt(argc, argv, "s")) != EOF)
  62:         switch (ch) {
  63:         case 's':
  64:             sflag = 1;
  65:             break;
  66:         case '?':
  67:         default:
  68:             (void)fprintf(stderr,
  69:                 "usage: hostname [-s] [hostname]\n");
  70:             exit(1);
  71:         }
  72:     argc -= optind;
  73:     argv += optind;
  74: 
  75:     if (*argv) {
  76:         if (sethostname(*argv, strlen(*argv)))
  77:             err(1, "sethostname");
  78:     } else {
  79:         if (gethostname(hostname, sizeof(hostname)))
  80:             err(1, "gethostname");
  81:         if (sflag && (p = strchr(hostname, '.')))
  82:             *p = '\0';
  83:         (void)printf("%s\n", hostname);
  84:     }
  85:     exit(0);
  86: }

Defined functions

Defined variables