mirror of
https://github.com/jart/cosmopolitan.git
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55 lines
3 KiB
C
55 lines
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/bits/weaken.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/internal.h"
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#include "libc/calls/sysdebug.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/sysv/errfuns.h"
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#include "libc/zipos/zipos.internal.h"
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/**
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* Changes permissions on file, e.g.:
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*
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* CHECK_NE(-1, fchmodat(AT_FDCWD, "foo/bar.txt", 0644));
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* CHECK_NE(-1, fchmodat(AT_FDCWD, "o/default/program.com", 0755));
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* CHECK_NE(-1, fchmodat(AT_FDCWD, "privatefolder/", 0700));
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*
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* @param path must exist
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* @param mode contains octal flags (base 8)
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* @param flags can have `AT_SYMLINK_NOFOLLOW`
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* @errors ENOENT, ENOTDIR, ENOSYS
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* @asyncsignalsafe
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* @see fchmod()
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*/
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int fchmodat(int dirfd, const char *path, uint32_t mode, int flags) {
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int rc;
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if (IsAsan() && !__asan_is_valid(path, 1)) return efault();
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if (weaken(__zipos_notat) && weaken(__zipos_notat)(dirfd, path) == -1) {
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rc = -1; /* TODO(jart): implement me */
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} else if (!IsWindows()) {
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rc = sys_fchmodat(dirfd, path, mode, flags);
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} else {
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rc = sys_fchmodat_nt(dirfd, path, mode, flags);
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}
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SYSDEBUG("fchmodat(%d, %s, %o, %d) -> %d %s", (long)dirfd, path, mode, flags,
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rc != -1 ? "" : strerror(errno));
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return rc;
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}
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