mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
e522aa3a07
- ASAN memory morgue is now lockless - Make C11 atomics header more portable - Rewrote pthread keys support to be lockless - Simplify Python's unicode table unpacking code - Make crash report write(2) closer to being atomic - Make it possible to strace/ftrace a single thread - ASAN now checks nul-terminated strings fast and properly - Windows fork() now restores TLS memory of calling thread
77 lines
4 KiB
C
77 lines
4 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/calls/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/errno.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/intrin/strace.internal.h"
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#include "libc/intrin/weaken.h"
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#include "libc/sysv/consts/at.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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* Checks if effective user can access path in particular ways.
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*
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* @param dirfd is normally AT_FDCWD but if it's an open directory and
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* file is a relative path, then file is opened relative to dirfd
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* @param path is a filename or directory
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* @param amode can be `R_OK`, `W_OK`, `X_OK`, or `F_OK`
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* @param flags can have `AT_EACCESS` and/or `AT_SYMLINK_NOFOLLOW`
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* @return 0 if ok, or -1 and sets errno
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* @raise EINVAL if `mode` has bad value
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* @raise EPERM if pledge() is in play without rpath promise
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* @raise EACCES if access for requested `mode` would be denied
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* @raise ENOTDIR if a directory component in `path` exists as non-directory
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* @raise ENOENT if component of `path` doesn't exist or `path` is empty
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* @raise ENOTSUP if `path` is a zip file and `dirfd` isn't `AT_FDCWD`
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* @note on Linux `flags` is only supported on Linux 5.8+
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* @asyncsignalsafe
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*/
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int faccessat(int dirfd, const char *path, int amode, int flags) {
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int e, rc;
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struct ZiposUri zipname;
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if (!path || (IsAsan() && !__asan_is_valid_str(path))) {
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rc = efault();
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} else if (__isfdkind(dirfd, kFdZip)) {
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rc = enotsup();
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} else if (_weaken(__zipos_open) &&
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_weaken(__zipos_parseuri)(path, &zipname) != -1) {
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rc = _weaken(__zipos_access)(&zipname, amode);
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} else if (!IsWindows()) {
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e = errno;
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if (!flags) goto NoFlags;
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if ((rc = sys_faccessat2(dirfd, path, amode, flags)) == -1) {
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if (errno == ENOSYS) {
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errno = e;
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NoFlags:
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rc = sys_faccessat(dirfd, path, amode, flags);
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}
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}
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} else {
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rc = sys_faccessat_nt(dirfd, path, amode, flags);
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}
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STRACE("faccessat(%s, %#s, %#o, %#x) → %d% m", DescribeDirfd(dirfd), path,
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amode, flags, rc);
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return rc;
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}
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