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42 lines
2.3 KiB
C
42 lines
2.3 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2021 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/calls.h"
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#include "libc/errno.h"
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#include "libc/str/str.h"
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#define CTL_KERN 1
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#define KERN_HOSTNAME 10
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int gethostname_bsd(char *name, size_t len) {
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char *p;
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int cmd[2];
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char buf[254];
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size_t buflen;
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cmd[0] = CTL_KERN;
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cmd[1] = KERN_HOSTNAME;
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buflen = sizeof(buf);
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if (sysctl(cmd, 2, buf, &buflen, NULL, 0) == -1) {
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if (errno == ENOMEM) errno = ENAMETOOLONG;
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return -1;
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}
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strncpy(name, buf, len);
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name[len - 1] = '\0';
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if ((p = strchr(name, '.'))) *p = '\0';
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return 0;
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}
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