37 lines · cpp
1//===-- Linux implementation of pipe --------------------------------------===//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/pipe.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#include "src/__support/macros/sanitizer.h" // for MSAN_UNPOISON16#include <sys/syscall.h> // For syscall numbers.17 18namespace LIBC_NAMESPACE_DECL {19 20LLVM_LIBC_FUNCTION(int, pipe, (int pipefd[2])) {21#ifdef SYS_pipe22 int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_pipe,23 reinterpret_cast<long>(pipefd));24#elif defined(SYS_pipe2)25 int ret = LIBC_NAMESPACE::syscall_impl<int>(26 SYS_pipe2, reinterpret_cast<long>(pipefd), 0);27#endif28 MSAN_UNPOISON(pipefd, sizeof(int) * 2);29 if (ret < 0) {30 libc_errno = -ret;31 return -1;32 }33 return ret;34}35 36} // namespace LIBC_NAMESPACE_DECL37