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417797d218
We always favor calling functions like openat(), fstatat(), etc. because Linux, XNU, FreeBSD, and OpenBSD all elected to support them, while some systems like Android love them so much, that they stopped supporting the old interfaces. This change ensures that when dirfd is actually a dirfd and not AT_FDCWD we'll do the right thing on Windows NT. We use an API that's been around since Vista to accomplish that. This change also adds exponential backoff to chdir() on Windows since it seems almost as flaky on Windows 7 as the rmdir() function.
41 lines
2.5 KiB
C
41 lines
2.5 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/sysv/consts/at.h"
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/**
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* Opens file.
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*
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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
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* @vforksafe
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*/
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nodiscard int open(const char *file, int flags, ...) {
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va_list va;
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unsigned mode;
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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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return openat(AT_FDCWD, file, flags, mode);
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}
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