| 1 | //===-- Linux implementation of dup3 --------------------------------------===// |
|---|---|
| 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/dup3.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 <sys/syscall.h> // For syscall numbers. |
| 16 | |
| 17 | namespace LIBC_NAMESPACE { |
| 18 | |
| 19 | LLVM_LIBC_FUNCTION(int, dup3, (int oldfd, int newfd, int flags)) { |
| 20 | // If dup2 syscall is available, we make use of directly. |
| 21 | int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_dup3, ts: oldfd, ts: newfd, ts: flags); |
| 22 | if (ret >= 0) |
| 23 | return ret; |
| 24 | libc_errno = -ret; |
| 25 | return -1; |
| 26 | } |
| 27 | |
| 28 | } // namespace LIBC_NAMESPACE |
| 29 |