UniquePtrExtensions.cpp

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/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "UniquePtrExtensions.h"

#include "mozilla/Assertions.h"

#include "mozilla/DebugOnly.h"

#ifdef XP_WIN

#  include <windows.h>

#else

#  include <errno.h>

#  include <unistd.h>

#  include <fcntl.h>

#endif

namespace mozilla {

namespace detail {

void FileHandleDeleter::operator()(FileHandleHelper aHelper) {

  if (aHelper != nullptr) {

    DebugOnly<bool> ok;

#ifdef XP_WIN

    ok = CloseHandle(aHelper);

#else

    ok = close(aHelper) == 0 || errno == EINTR;

#endif

    MOZ_ASSERT(ok, "failed to close file handle");

}  // namespace detail

#ifdef XP_UNIX

void SetCloseOnExec(detail::FileHandleType aFile) {

  // The fcntl calls shouldn't fail if aFile is valid.

  if (aFile >= 0) {

    int fdFlags = fcntl(aFile, F_GETFD);

    MOZ_ASSERT(fdFlags >= 0);

    if (fdFlags >= 0) {

      DebugOnly<int> rv = fcntl(aFile, F_SETFD, fdFlags | FD_CLOEXEC);

      MOZ_ASSERT(rv != -1);

#endif

#ifndef __wasm__

UniqueFileHandle DuplicateFileHandle(detail::FileHandleType aFile) {

#  ifdef XP_WIN

  if (aFile != INVALID_HANDLE_VALUE && aFile != NULL) {

    HANDLE handle;

    HANDLE currentProcess = ::GetCurrentProcess();

    if (::DuplicateHandle(currentProcess, aFile, currentProcess, &handle, 0,

                          false, DUPLICATE_SAME_ACCESS)) {

      return UniqueFileHandle{handle};

#  else

  if (aFile != -1) {

    int fd;

    // Set cloexec atomically if supported; otherwise fall back to non-atomic.

#    ifdef F_DUPFD_CLOEXEC

    fd = fcntl(aFile, F_DUPFD_CLOEXEC, 0);

#    else

    fd = dup(aFile);

    SetCloseOnExec(fd);

#    endif

    return UniqueFileHandle{fd};

#  endif

  return nullptr;

#endif

}  // namespace mozilla