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/__support/macros/config.h" 15 #include "src/errno/libc_errno.h" 16 #include <sys/syscall.h> // For syscall numbers. 17 18 namespace LIBC_NAMESPACE_DECL { 19 20 LLVM_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_DECL 30