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/sanitizer.h" // for MSAN_UNPOISON 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, pipe, (int pipefd[2])) { 20 #ifdef SYS_pipe 21 int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_pipe, 22 reinterpret_cast<long>(pipefd)); 23 #elif defined(SYS_pipe2) 24 int ret = LIBC_NAMESPACE::syscall_impl<int>( 25 SYS_pipe2, reinterpret_cast<long>(pipefd), 0); 26 #endif 27 MSAN_UNPOISON(pipefd, sizeof(int) * 2); 28 if (ret < 0) { 29 libc_errno = -ret; 30 return -1; 31 } 32 return ret; 33 } 34 35 } // namespace LIBC_NAMESPACE 36