mirror of
https://github.com/jart/cosmopolitan.git
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60 lines
3.2 KiB
C
60 lines
3.2 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/bits/weaken.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/strace.internal.h"
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#include "libc/calls/syscall-nt.internal.h"
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#include "libc/calls/syscall-sysv.internal.h"
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#include "libc/dce.h"
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#include "libc/intrin/asan.internal.h"
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#include "libc/intrin/describeflags.internal.h"
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#include "libc/sysv/errfuns.h"
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#include "libc/zipos/zipos.internal.h"
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/**
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* Creates hard filesystem link.
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*
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* This allows two names to point to the same file data on disk. They
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* can only be differentiated by examining the inode number.
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*
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* @param flags can have AT_EMPTY_PATH or AT_SYMLINK_NOFOLLOW
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* @return 0 on success, or -1 w/ errno
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* @asyncsignalsafe
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*/
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int linkat(int olddirfd, const char *oldpath, int newdirfd, const char *newpath,
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int flags) {
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int rc;
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char buf[2][12];
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if (IsAsan() &&
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(!__asan_is_valid(oldpath, 1) || !__asan_is_valid(newpath, 1))) {
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rc = efault();
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} else if (weaken(__zipos_notat) &&
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((rc = __zipos_notat(olddirfd, oldpath)) == -1 ||
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(rc = __zipos_notat(newdirfd, newpath)) == -1)) {
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STRACE("zipos fchownat not supported yet");
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} else if (!IsWindows()) {
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rc = sys_linkat(olddirfd, oldpath, newdirfd, newpath, flags);
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} else {
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rc = sys_linkat_nt(olddirfd, oldpath, newdirfd, newpath);
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}
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STRACE("linkat(%s, %#s, %s, %#s, %#b) → %d% m",
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DescribeDirfd(buf[0], olddirfd), oldpath,
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DescribeDirfd(buf[1], newdirfd), newpath, flags, rc);
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return rc;
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}
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