libc/src/unistd/linux/dup3.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-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, oldfd, newfd, flags);
  22   if (ret >= 0)
  23     return ret;
  24   libc_errno = -ret;
  25   return -1;
  26 }
  27
  28 } // namespace LIBC_NAMESPACE