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bcf1365c | 1 | /* |
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2 | * Copyright (c) 1988, 1993 |
3 | * The Regents of the University of California. All rights reserved. | |
d93680d6 | 4 | * |
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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. | |
bcf1365c DF |
32 | */ |
33 | ||
205a2d85 | 34 | #ifndef lint |
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35 | static char copyright[] = |
36 | "@(#) Copyright (c) 1988, 1993\n\ | |
37 | The Regents of the University of California. All rights reserved.\n"; | |
d93680d6 | 38 | #endif /* not lint */ |
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39 | |
40 | #ifndef lint | |
ad787160 | 41 | static char sccsid[] = "@(#)hostname.c 8.1 (Berkeley) 5/31/93"; |
d93680d6 | 42 | #endif /* not lint */ |
bcf1365c | 43 | |
d93680d6 | 44 | #include <sys/param.h> |
d3d3fc37 | 45 | |
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46 | #include <err.h> |
47 | #include <stdio.h> | |
48 | #include <stdlib.h> | |
49 | #include <string.h> | |
50 | #include <unistd.h> | |
51 | ||
52 | int | |
d3d3fc37 | 53 | main(argc,argv) |
d93680d6 | 54 | int argc; |
cceecdef | 55 | char *argv[]; |
d3d3fc37 | 56 | { |
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57 | extern int optind; |
58 | int ch, sflag; | |
cceecdef | 59 | char *p, hostname[MAXHOSTNAMELEN]; |
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60 | |
61 | sflag = 0; | |
62 | while ((ch = getopt(argc, argv, "s")) != EOF) | |
cceecdef | 63 | switch (ch) { |
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64 | case 's': |
65 | sflag = 1; | |
66 | break; | |
67 | case '?': | |
68 | default: | |
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69 | (void)fprintf(stderr, |
70 | "usage: hostname [-s] [hostname]\n"); | |
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71 | exit(1); |
72 | } | |
cceecdef | 73 | argc -= optind; |
d93680d6 | 74 | argv += optind; |
65ed1a40 | 75 | |
d93680d6 | 76 | if (*argv) { |
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77 | if (sethostname(*argv, strlen(*argv))) |
78 | err(1, "sethostname"); | |
d3d3fc37 | 79 | } else { |
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80 | if (gethostname(hostname, sizeof(hostname))) |
81 | err(1, "gethostname"); | |
82 | if (sflag && (p = strchr(hostname, '.'))) | |
d93680d6 | 83 | *p = '\0'; |
cceecdef | 84 | (void)printf("%s\n", hostname); |
d3d3fc37 | 85 | } |
d93680d6 | 86 | exit(0); |
d3d3fc37 | 87 | } |