mirror of
https://github.com/mollyim/webrtc.git
synced 2025-05-12 21:30:45 +01:00
dc0911bd37
Bug: webrtc:13579 Change-Id: I9fbc3d6df2dedb7eac908e1af38300d2b42142c8 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/272000 Commit-Queue: Ali Tofigh <alito@webrtc.org> Reviewed-by: Alexander Cooper <alcooper@chromium.org> Cr-Commit-Position: refs/heads/main@{#37817}
59 lines
1.7 KiB
C++
59 lines
1.7 KiB
C++
/*
|
|
* Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
|
|
*
|
|
* Use of this source code is governed by a BSD-style license
|
|
* that can be found in the LICENSE file in the root of the source
|
|
* tree. An additional intellectual property rights grant can be found
|
|
* in the file PATENTS. All contributing project authors may
|
|
* be found in the AUTHORS file in the root of the source tree.
|
|
*/
|
|
|
|
#include "modules/desktop_capture/screen_drawer_lock_posix.h"
|
|
|
|
#include <fcntl.h>
|
|
#include <sys/stat.h>
|
|
|
|
#include "absl/strings/string_view.h"
|
|
#include "rtc_base/checks.h"
|
|
#include "rtc_base/logging.h"
|
|
|
|
namespace webrtc {
|
|
|
|
namespace {
|
|
|
|
// A uuid as the name of semaphore.
|
|
static constexpr char kSemaphoreName[] = "GSDL54fe5552804711e6a7253f429a";
|
|
|
|
} // namespace
|
|
|
|
ScreenDrawerLockPosix::ScreenDrawerLockPosix()
|
|
: ScreenDrawerLockPosix(kSemaphoreName) {}
|
|
|
|
ScreenDrawerLockPosix::ScreenDrawerLockPosix(const char* name) {
|
|
semaphore_ = sem_open(name, O_CREAT, S_IRWXU | S_IRWXG | S_IRWXO, 1);
|
|
if (semaphore_ == SEM_FAILED) {
|
|
RTC_LOG_ERRNO(LS_ERROR) << "Failed to create named semaphore with " << name;
|
|
RTC_DCHECK_NOTREACHED();
|
|
}
|
|
|
|
sem_wait(semaphore_);
|
|
}
|
|
|
|
ScreenDrawerLockPosix::~ScreenDrawerLockPosix() {
|
|
if (semaphore_ == SEM_FAILED) {
|
|
return;
|
|
}
|
|
|
|
sem_post(semaphore_);
|
|
sem_close(semaphore_);
|
|
// sem_unlink a named semaphore won't wait until other clients to release the
|
|
// sem_t. So if a new process starts, it will sem_open a different kernel
|
|
// object with the same name and eventually breaks the cross-process lock.
|
|
}
|
|
|
|
// static
|
|
void ScreenDrawerLockPosix::Unlink(absl::string_view name) {
|
|
sem_unlink(std::string(name).c_str());
|
|
}
|
|
|
|
} // namespace webrtc
|