1 /* 2 * Copyright (c) 1983, 1988 Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #ifndef lint 9 char copyright[] = 10 "@(#) Copyright (c) 1983, 1988 Regents of the University of California.\n\ 11 All rights reserved.\n"; 12 #endif /* not lint */ 13 14 #ifndef lint 15 static char sccsid[] = "@(#)hostname.c 5.4 (Berkeley) 05/31/90"; 16 #endif /* not lint */ 17 18 #include <stdio.h> 19 #include <sys/param.h> 20 21 main(argc,argv) 22 int argc; 23 char **argv; 24 { 25 extern int optind; 26 int ch, sflag; 27 char hostname[MAXHOSTNAMELEN], *p, *index(); 28 29 sflag = 0; 30 while ((ch = getopt(argc, argv, "s")) != EOF) 31 switch((char)ch) { 32 case 's': 33 sflag = 1; 34 break; 35 case '?': 36 default: 37 fputs("hostname [-s] [hostname]\n", stderr); 38 exit(1); 39 } 40 argv += optind; 41 42 if (*argv) { 43 if (sethostname(*argv, strlen(*argv))) { 44 perror("sethostname"); 45 exit(1); 46 } 47 } else { 48 if (gethostname(hostname, sizeof(hostname))) { 49 perror("gethostname"); 50 exit(1); 51 } 52 if (sflag && (p = index(hostname, '.'))) 53 *p = '\0'; 54 puts(hostname); 55 } 56 exit(0); 57 } 58