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https://github.com/jart/cosmopolitan.git
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6f7d0cb1c3
This makes breaking changes to add underscores to many non-standard function names provided by the c library. MODE=tiny is now tinier and we now use smaller locks that are better for tiny apps in this mode. Some headers have been renamed to be in the same folder as the build package, so it'll be easier to know which build dependency is needed. Certain old misguided interfaces have been removed. Intel intrinsics headers are now listed in libc/isystem (but not in the amalgamation) to help further improve open source compatibility. Header complexity has also been reduced. Lastly, more shell scripts are now available.
76 lines
3.7 KiB
C
76 lines
3.7 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 2020 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/intrin/strace.internal.h"
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#include "libc/calls/syscall_support-sysv.internal.h"
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#include "libc/dce.h"
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#include "libc/intrin/kprintf.h"
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#include "libc/nt/enum/computernameformat.h"
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#include "libc/sysv/errfuns.h"
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#define KERN_HOSTNAME 10
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/**
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* Returns name of current host.
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*
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* For example, if the fully-qualified hostname is "host.domain.example"
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* then this SHOULD return "host" however that might not be the case; it
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* depends on how the host machine is configured. It's fair to say if it
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* has a dot, it's a FQDN, otherwise it's a node.
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*
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* The nul / mutation semantics are tricky. Here is some safe copypasta:
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*
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* char host[254];
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* if (gethostname(host, sizeof(host))) {
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* strcpy(host, "localhost");
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* }
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*
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* On Linux this is the same as `/proc/sys/kernel/hostname`.
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*
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* @param name receives output name, which is guaranteed to be complete
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* and have a nul-terminator if this function return zero
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* @param len is size of `name` consider using `DNS_NAME_MAX + 1` (254)
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* @raise EINVAL if `len` is negative
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* @raise EFAULT if `name` is an invalid address
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* @raise ENAMETOOLONG if the underlying system call succeeded, but the
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* returned hostname had a length equal to or greater than `len` in
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* which case this error is raised and the buffer is modified, with
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* as many bytes of hostname as possible excluding a nul-terminator
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* @return 0 on success, or -1 w/ errno
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*/
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int gethostname(char *name, size_t len) {
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int rc;
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if (len < 0) {
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rc = einval();
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} else if (!len) {
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rc = 0;
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} else if (!name) {
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rc = efault();
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} else if (IsLinux()) {
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rc = gethostname_linux(name, len);
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} else if (IsBsd()) {
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rc = gethostname_bsd(name, len, KERN_HOSTNAME);
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} else if (IsWindows()) {
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rc = gethostname_nt(name, len, kNtComputerNamePhysicalDnsHostname);
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} else {
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rc = enosys();
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}
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STRACE("gethostname([%#.*s], %'zu) → %d% m", len, name, len, rc);
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return rc;
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}
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