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//===-- Implementation of openat ------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "src/fcntl/openat.h"
#include "src/__support/OSUtil/syscall.h" // For internal syscall function.
#include "src/__support/common.h"
#include "src/errno/libc_errno.h"
#include <fcntl.h>
#include <stdarg.h>
#include <sys/syscall.h> // For syscall numbers.
namespace __llvm_libc {
LLVM_LIBC_FUNCTION(int, openat, (int dfd, const char *path, int flags, ...)) {
mode_t mode_flags = 0;
// O_TMPFILE is a multi-bit flag so we test all bits by checking for equality
// with O_TMPFILE
if ((flags & O_CREAT) || (flags & O_TMPFILE) == O_TMPFILE) {
va_list varargs;
va_start(varargs, flags);
mode_flags = va_arg(varargs, mode_t);
va_end(varargs);
}
int fd =
__llvm_libc::syscall_impl<int>(SYS_openat, dfd, path, flags, mode_flags);
if (fd > 0)
return fd;
libc_errno = -fd;
return -1;
}
} // namespace __llvm_libc
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