libc/src/unistd/linux/pipe.cpp

//===-- Linux implementation of pipe --------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#include "src/unistd/pipe.h"

#include "src/__support/OSUtil/syscall.h" // For internal syscall function.
#include "src/__support/common.h"
#include "src/__support/libc_errno.h"
#include "src/__support/macros/config.h"
#include "src/__support/macros/sanitizer.h" // for MSAN_UNPOISON
#include <sys/syscall.h>                    // For syscall numbers.

namespace LIBC_NAMESPACE_DECL {

LLVM_LIBC_FUNCTION(int, pipe, (int pipefd[2])) {
#ifdef SYS_pipe
  int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_pipe,
                                              reinterpret_cast<long>(pipefd));
#elif defined(SYS_pipe2)
  int ret = LIBC_NAMESPACE::syscall_impl<int>(
      SYS_pipe2, reinterpret_cast<long>(pipefd), 0);
#endif
  MSAN_UNPOISON(pipefd, sizeof(int) * 2);
  if (ret < 0) {
    libc_errno = -ret;
    return -1;
  }
  return ret;
}

} // namespace LIBC_NAMESPACE_DECL