sbase/hostname.c

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C
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/* See LICENSE file for copyright and license details. */
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#include <limits.h>
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#include <stdio.h>
#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "util.h"
static void
usage(void)
{
eprintf("usage: %s [name]\n", argv0);
}
int
main(int argc, char *argv[])
{
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long sz;
char *host;
sz = sysconf(_SC_HOST_NAME_MAX);
if (sz < 0)
sz = 255;
host = malloc(sz + 1);
if (!host)
eprintf("malloc:");
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ARGBEGIN {
default:
usage();
} ARGEND;
if (argc < 1) {
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if (gethostname(host, sz + 1) < 0)
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eprintf("gethostname:");
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puts(host);
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} else {
if (sethostname(argv[0], strlen(argv[0])) < 0)
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eprintf("sethostname:");
}
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free(host);
return EXIT_SUCCESS;
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}