30 lines · cpp
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-exception6//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/__support/libc_errno.h"15#include "src/__support/macros/config.h"16#include <sys/syscall.h> // For syscall numbers.17 18namespace LIBC_NAMESPACE_DECL {19 20LLVM_LIBC_FUNCTION(int, dup3, (int oldfd, int newfd, int flags)) {21 // If dup2 syscall is available, we make use of directly.22 int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_dup3, oldfd, newfd, flags);23 if (ret >= 0)24 return ret;25 libc_errno = -ret;26 return -1;27}28 29} // namespace LIBC_NAMESPACE_DECL30