mirror of
https://github.com/jart/cosmopolitan.git
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62 lines
3 KiB
C
62 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/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/str/str.h"
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#include "libc/sysv/consts/f.h"
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#include "libc/sysv/consts/fd.h"
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#include "libc/sysv/consts/o.h"
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int sys_openat(int dirfd, const char *file, int flags, unsigned mode) {
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static bool once, modernize;
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int d, e, f;
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/*
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* RHEL5 doesn't support O_CLOEXEC. It's hard to test for this.
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* Sometimes the system call succeeds and it just doesn't set the
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* flag. Other times, it return -530 which makes no sense.
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*/
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if (!IsLinux() || !(flags & O_CLOEXEC) || modernize) {
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d = __sys_openat(dirfd, file, flags, mode);
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} else if (once) {
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if ((d = __sys_openat(dirfd, file, flags & ~O_CLOEXEC, mode)) != -1) {
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e = errno;
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if (__sys_fcntl(d, F_SETFD, FD_CLOEXEC) == -1) {
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errno = e;
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}
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}
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} else {
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e = errno;
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if ((d = __sys_openat(dirfd, file, flags, mode)) != -1) {
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if ((f = __sys_fcntl(d, F_GETFD)) != -1) {
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if (f & FD_CLOEXEC) {
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modernize = true;
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} else {
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__sys_fcntl(d, F_SETFD, FD_CLOEXEC);
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}
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}
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errno = e;
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once = true;
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} else if (errno > 255) {
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once = true;
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d = sys_openat(dirfd, file, flags, mode);
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}
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}
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return d;
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}
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