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-exception 6 // 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/macros/config.h" 14 #include "src/__support/macros/sanitizer.h" // for MSAN_UNPOISON 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, pipe, (int pipefd[2])) { 21 #ifdef SYS_pipe 22 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 #endif 28 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_DECL 37