118 lines
3.3 KiB
C++
118 lines
3.3 KiB
C++
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/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <folly/portability/Fcntl.h>
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#ifdef _WIN32
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#include <folly/portability/Sockets.h>
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#include <folly/portability/SysStat.h>
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#include <folly/portability/Windows.h>
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namespace folly {
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namespace portability {
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namespace fcntl {
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int creat(char const* fn, int pm) {
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return _creat(fn, pm);
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}
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int fcntl(int fd, int cmd, ...) {
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va_list args;
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int res = -1;
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va_start(args, cmd);
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switch (cmd) {
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case F_GETFD: {
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HANDLE h = (HANDLE)_get_osfhandle(fd);
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if (h != INVALID_HANDLE_VALUE) {
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DWORD flags;
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if (GetHandleInformation(h, &flags)) {
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res = int(flags & HANDLE_FLAG_INHERIT);
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}
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}
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break;
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}
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case F_SETFD: {
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int flags = va_arg(args, int);
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HANDLE h = (HANDLE)_get_osfhandle(fd);
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if (h != INVALID_HANDLE_VALUE) {
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if (SetHandleInformation(
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h, HANDLE_FLAG_INHERIT, (DWORD)(flags & FD_CLOEXEC))) {
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res = 0;
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}
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}
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break;
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}
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case F_GETFL: {
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// No idea how to get the IO blocking mode, so return 0.
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res = 0;
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break;
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}
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case F_SETFL: {
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int flags = va_arg(args, int);
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// If it's not a socket, it's probably a pipe.
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if (folly::portability::sockets::is_fh_socket(fd)) {
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SOCKET s = (SOCKET)_get_osfhandle(fd);
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if (s != INVALID_SOCKET) {
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u_long nonBlockingEnabled = (flags & O_NONBLOCK) ? 1 : 0;
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res = ioctlsocket(s, FIONBIO, &nonBlockingEnabled);
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}
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} else {
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HANDLE p = (HANDLE)_get_osfhandle(fd);
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if (GetFileType(p) == FILE_TYPE_PIPE) {
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DWORD newMode = PIPE_READMODE_BYTE;
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newMode |= (flags & O_NONBLOCK) ? PIPE_NOWAIT : PIPE_WAIT;
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if (SetNamedPipeHandleState(p, &newMode, nullptr, nullptr)) {
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res = 0;
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}
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}
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}
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break;
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}
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}
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va_end(args);
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return res;
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}
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int open(char const* fn, int of, int pm) {
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int fh;
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int realMode = _S_IREAD;
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if ((of & _O_RDWR) == _O_RDWR) {
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realMode = _S_IREAD | _S_IWRITE;
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} else if ((of & _O_WRONLY) == _O_WRONLY) {
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realMode = _S_IWRITE;
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} else if ((of & _O_RDONLY) != _O_RDONLY) {
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// One of these needs to be present, just fail if
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// none are.
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return -1;
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}
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if (!strcmp(fn, "/dev/null")) {
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// Windows doesn't have a /dev/null, but it does have
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// NUL, which achieves the same result.
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fn = "NUL";
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}
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errno_t res = _sopen_s(&fh, fn, of, _SH_DENYNO, realMode);
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return res ? -1 : fh;
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}
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int posix_fallocate(int fd, off_t offset, off_t len) {
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// We'll pretend we always have enough space. We
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// can't exactly pre-allocate on windows anyways.
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return 0;
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}
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} // namespace fcntl
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} // namespace portability
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} // namespace folly
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#endif
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