mirror of
https://github.com/jart/cosmopolitan.git
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fbc053e018
- Introduce __assert_disable global - Improve strsignal() thread safety - Make system call tracing thread safe - Fix SO_RCVTIMEO / SO_SNDTIMEO on Windows - Refactor DescribeFoo() functions into one place - Fix fork() on Windows when TLS and MAP_STACK exist - Round upwards in setsockopt(SO_RCVTIMEO) on Windows - Disable futexes on OpenBSD which seem extremely broken - Implement a better kludge for monotonic time on Windows
58 lines
3.1 KiB
C
58 lines
3.1 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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* 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)) {
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rc = efault();
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} else if (weaken(__zipos_notat) && (rc = __zipos_notat(dirfd, path)) == -1) {
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rc = eopnotsupp();
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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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STRACE("fchmodat(%s, %#s, %#o, %d) → %d% m", DescribeDirfd(dirfd), path, mode,
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flags, rc);
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return rc;
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}
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