1//===-- Linux implementation of access ------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#include "src/unistd/access.h"
10
11#include "src/__support/OSUtil/syscall.h" // For internal syscall function.
12#include "src/__support/common.h"
13
14#include "src/errno/libc_errno.h"
15#include <fcntl.h>
16#include <sys/syscall.h> // For syscall numbers.
17
18namespace LIBC_NAMESPACE {
19
20LLVM_LIBC_FUNCTION(int, access, (const char *path, int mode)) {
21#ifdef SYS_access
22 int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_access, ts: path, ts: mode);
23#elif defined(SYS_faccessat)
24 int ret =
25 LIBC_NAMESPACE::syscall_impl<int>(SYS_faccessat, AT_FDCWD, path, mode, 0);
26#else
27#error "access and faccessat syscalls not available."
28#endif
29
30 if (ret < 0) {
31 libc_errno = -ret;
32 return -1;
33 }
34 return 0;
35}
36
37} // namespace LIBC_NAMESPACE
38

source code of libc/src/unistd/linux/access.cpp