49 lines
2.8 KiB
C
49 lines
2.8 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/sysv/consts/at.h"
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#include "libc/sysv/errfuns.h"
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/**
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* Opens file, the modern way.
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*
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* @param dirfd is normally AT_FDCWD or an open relative directory thing
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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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*/
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int openat(int dirfd, const char *pathname, 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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if (!pathname) return efault();
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if (dirfd == AT_FDCWD) {
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return open(pathname, flags, mode);
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} else {
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return openat$sysv(dirfd, pathname, flags, mode);
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}
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}
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