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
85 lines
4 KiB
C
85 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/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/state.internal.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/log/log.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/at.h"
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#include "libc/sysv/consts/o.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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* Opens file.
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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 file is a UTF-8 string, preferably relative w/ forward slashes
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* @param flags should be O_RDONLY, O_WRONLY, or O_RDWR, and can be or'd
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* with O_CREAT, O_TRUNC, O_APPEND, O_EXCL, O_CLOEXEC, O_TMPFILE
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* @param mode is an octal user/group/other permission signifier, that's
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* ignored if O_CREAT or O_TMPFILE weren't passed
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* @return number needing close(), or -1 w/ errno
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* @asyncsignalsafe (zip files may have issues)
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* @vforksafe (raises error if zip file)
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* @threadsafe
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*/
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int openat(int dirfd, const char *file, int flags, ...) {
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int rc;
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va_list va;
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unsigned mode;
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struct ZiposUri zipname;
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va_start(va, flags);
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mode = va_arg(va, unsigned);
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va_end(va);
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if (file && (!IsAsan() || __asan_is_valid(file, 1))) {
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if (!__isfdkind(dirfd, kFdZip)) {
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if (weaken(__zipos_open) &&
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weaken(__zipos_parseuri)(file, &zipname) != -1) {
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if (!__vforked && dirfd == AT_FDCWD) {
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rc = weaken(__zipos_open)(&zipname, flags, mode);
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} else {
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rc = eopnotsupp(); /* TODO */
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}
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} else if (!IsWindows() && !IsMetal()) {
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rc = sys_openat(dirfd, file, flags, mode);
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} else if (IsMetal()) {
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rc = sys_openat_metal(dirfd, file, flags, mode);
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} else {
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rc = sys_open_nt(dirfd, file, flags, mode);
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}
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} else {
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rc = eopnotsupp(); /* TODO */
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}
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} else {
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rc = efault();
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}
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STRACE("openat(%s, %#s, %s, %#o) → %d% m", DescribeDirfd(dirfd), file,
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DescribeOpenFlags(flags), (flags & (O_CREAT | O_TMPFILE)) ? mode : 0,
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rc);
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return rc;
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}
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