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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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
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