mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 11:37:35 +00:00
85 lines
4.1 KiB
C
85 lines
4.1 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2020 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ Permission to use, copy, modify, and/or distribute this software for │
|
|
│ any purpose with or without fee is hereby granted, provided that the │
|
|
│ above copyright notice and this permission notice appear in all copies. │
|
|
│ │
|
|
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
|
|
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
|
|
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
|
|
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
|
|
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
|
|
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
|
|
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
|
|
│ PERFORMANCE OF THIS SOFTWARE. │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/calls/calls.h"
|
|
#include "libc/calls/internal.h"
|
|
#include "libc/calls/state.internal.h"
|
|
#include "libc/calls/strace.internal.h"
|
|
#include "libc/calls/syscall-nt.internal.h"
|
|
#include "libc/calls/syscall-sysv.internal.h"
|
|
#include "libc/dce.h"
|
|
#include "libc/intrin/asan.internal.h"
|
|
#include "libc/intrin/describeflags.internal.h"
|
|
#include "libc/intrin/weaken.h"
|
|
#include "libc/log/log.h"
|
|
#include "libc/str/str.h"
|
|
#include "libc/sysv/consts/at.h"
|
|
#include "libc/sysv/consts/o.h"
|
|
#include "libc/sysv/errfuns.h"
|
|
#include "libc/zipos/zipos.internal.h"
|
|
|
|
/**
|
|
* Opens file.
|
|
*
|
|
* @param dirfd is normally AT_FDCWD but if it's an open directory and
|
|
* file is a relative path, then file is opened relative to dirfd
|
|
* @param file is a UTF-8 string, preferably relative w/ forward slashes
|
|
* @param flags should be O_RDONLY, O_WRONLY, or O_RDWR, and can be or'd
|
|
* with O_CREAT, O_TRUNC, O_APPEND, O_EXCL, O_CLOEXEC, O_TMPFILE
|
|
* @param mode is an octal user/group/other permission signifier, that's
|
|
* ignored if O_CREAT or O_TMPFILE weren't passed
|
|
* @return number needing close(), or -1 w/ errno
|
|
* @asyncsignalsafe (zip files may have issues)
|
|
* @vforksafe (raises error if zip file)
|
|
* @threadsafe
|
|
*/
|
|
int openat(int dirfd, const char *file, int flags, ...) {
|
|
int rc;
|
|
va_list va;
|
|
unsigned mode;
|
|
struct ZiposUri zipname;
|
|
va_start(va, flags);
|
|
mode = va_arg(va, unsigned);
|
|
va_end(va);
|
|
if (file && (!IsAsan() || __asan_is_valid(file, 1))) {
|
|
if (!__isfdkind(dirfd, kFdZip)) {
|
|
if (weaken(__zipos_open) &&
|
|
weaken(__zipos_parseuri)(file, &zipname) != -1) {
|
|
if (!__vforked && dirfd == AT_FDCWD) {
|
|
rc = weaken(__zipos_open)(&zipname, flags, mode);
|
|
} else {
|
|
rc = eopnotsupp(); /* TODO */
|
|
}
|
|
} else if (!IsWindows() && !IsMetal()) {
|
|
rc = sys_openat(dirfd, file, flags, mode);
|
|
} else if (IsMetal()) {
|
|
rc = sys_openat_metal(dirfd, file, flags, mode);
|
|
} else {
|
|
rc = sys_open_nt(dirfd, file, flags, mode);
|
|
}
|
|
} else {
|
|
rc = eopnotsupp(); /* TODO */
|
|
}
|
|
} else {
|
|
rc = efault();
|
|
}
|
|
STRACE("openat(%s, %#s, %s, %#o) → %d% m", DescribeDirfd(dirfd), file,
|
|
DescribeOpenFlags(flags), (flags & (O_CREAT | O_TMPFILE)) ? mode : 0,
|
|
rc);
|
|
return rc;
|
|
}
|