50 lines
2.8 KiB
C
50 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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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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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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