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/libc_errno.h"
14#include "src/__support/macros/config.h"
15#include "src/__support/macros/sanitizer.h" // for MSAN_UNPOISON
16#include <sys/syscall.h> // For syscall numbers.
17
18namespace LIBC_NAMESPACE_DECL {
19
20LLVM_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

source code of libc/src/unistd/linux/pipe.cpp