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 | |
18 | namespace LIBC_NAMESPACE { |
19 | |
20 | LLVM_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 | |