1 | //===-- Implementation of openat ------------------------------------------===// |
---|---|
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/fcntl/openat.h" |
10 | |
11 | #include "src/__support/OSUtil/syscall.h" // For internal syscall function. |
12 | #include "src/__support/common.h" |
13 | #include "src/__support/libc_errno.h" |
14 | #include "src/__support/macros/config.h" |
15 | |
16 | #include "hdr/types/mode_t.h" |
17 | #include <stdarg.h> |
18 | #include <sys/syscall.h> // For syscall numbers. |
19 | |
20 | namespace LIBC_NAMESPACE_DECL { |
21 | |
22 | LLVM_LIBC_FUNCTION(int, openat, (int dfd, const char *path, int flags, ...)) { |
23 | mode_t mode_flags = 0; |
24 | // O_TMPFILE is a multi-bit flag so we test all bits by checking for equality |
25 | // with O_TMPFILE |
26 | if ((flags & O_CREAT) || (flags & O_TMPFILE) == O_TMPFILE) { |
27 | va_list varargs; |
28 | va_start(varargs, flags); |
29 | mode_flags = va_arg(varargs, mode_t); |
30 | va_end(varargs); |
31 | } |
32 | |
33 | int fd = LIBC_NAMESPACE::syscall_impl<int>(SYS_openat, dfd, path, flags, |
34 | mode_flags); |
35 | if (fd > 0) |
36 | return fd; |
37 | |
38 | libc_errno = -fd; |
39 | return -1; |
40 | } |
41 | |
42 | } // namespace LIBC_NAMESPACE_DECL |
43 |