From 2aa4a82499d4becd2284cdb482213d541b8804dd Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 28 Apr 2024 16:29:10 +0200 Subject: Adding upstream version 86.0.1. Signed-off-by: Daniel Baumann --- xpcom/base/nsDumpUtils.h | 184 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 184 insertions(+) create mode 100644 xpcom/base/nsDumpUtils.h (limited to 'xpcom/base/nsDumpUtils.h') diff --git a/xpcom/base/nsDumpUtils.h b/xpcom/base/nsDumpUtils.h new file mode 100644 index 0000000000..0df3fa78d6 --- /dev/null +++ b/xpcom/base/nsDumpUtils.h @@ -0,0 +1,184 @@ +/* -*- 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/. */ + +#ifndef mozilla_nsDumpUtils_h +#define mozilla_nsDumpUtils_h + +#include "nsIObserver.h" +#include "base/message_loop.h" +#include "nsXULAppAPI.h" +#include "nsThreadUtils.h" +#include "mozilla/Mutex.h" +#include "mozilla/StaticPtr.h" +#include "nsTArray.h" + +#ifdef LOG +# undef LOG +#endif + +#ifdef ANDROID +# include "android/log.h" +# define LOG(...) \ + __android_log_print(ANDROID_LOG_INFO, "Gecko:DumpUtils", ##__VA_ARGS__) +#else +# define LOG(...) +#endif + +#ifdef XP_UNIX // { + +/** + * Abstract base class for something which watches an fd and takes action when + * we can read from it without blocking. + */ +class FdWatcher : public MessageLoopForIO::Watcher, public nsIObserver { + protected: + MessageLoopForIO::FileDescriptorWatcher mReadWatcher; + int mFd; + + virtual ~FdWatcher() { + // StopWatching should have run. + MOZ_ASSERT(mFd == -1); + } + + public: + FdWatcher() : mFd(-1) { MOZ_ASSERT(NS_IsMainThread()); } + + /** + * Open the fd to watch. If we encounter an error, return -1. + */ + virtual int OpenFd() = 0; + + /** + * Called when you can read() from the fd without blocking. Note that this + * function is also called when you're at eof (read() returns 0 in this case). + */ + virtual void OnFileCanReadWithoutBlocking(int aFd) override = 0; + virtual void OnFileCanWriteWithoutBlocking(int aFd) override{}; + + NS_DECL_THREADSAFE_ISUPPORTS + + /** + * Initialize this object. This should be called right after the object is + * constructed. (This would go in the constructor, except we interact with + * XPCOM, which we can't do from a constructor because our refcount is 0 at + * that point.) + */ + void Init(); + + // Implementations may call this function multiple times if they ensure that + + virtual void StartWatching(); + + // Since implementations can call StartWatching() multiple times, they can of + // course call StopWatching() multiple times. + virtual void StopWatching(); + + NS_IMETHOD Observe(nsISupports* aSubject, const char* aTopic, + const char16_t* aData) override { + MOZ_ASSERT(NS_IsMainThread()); + MOZ_ASSERT(!strcmp(aTopic, "xpcom-shutdown")); + + XRE_GetIOMessageLoop()->PostTask(mozilla::NewRunnableMethod( + "FdWatcher::StopWatching", this, &FdWatcher::StopWatching)); + + return NS_OK; + } +}; + +typedef void (*FifoCallback)(const nsCString& aInputStr); +struct FifoInfo { + nsCString mCommand; + FifoCallback mCallback; +}; +typedef nsTArray FifoInfoArray; + +class FifoWatcher : public FdWatcher { + public: + /** + * The name of the preference used to enable/disable the FifoWatcher. + */ + // The length of this array must match the size of the string constant in + // the definition in nsDumpUtils.cpp. A mismatch will result in a compile-time + // error. + static const char kPrefName[38]; + + static FifoWatcher* GetSingleton(); + + static bool MaybeCreate(); + + void RegisterCallback(const nsCString& aCommand, FifoCallback aCallback); + + virtual ~FifoWatcher(); + + virtual int OpenFd() override; + + virtual void OnFileCanReadWithoutBlocking(int aFd) override; + + private: + nsAutoCString mDirPath; + + static mozilla::StaticRefPtr sSingleton; + + explicit FifoWatcher(nsCString aPath) + : mDirPath(aPath), mFifoInfoLock("FifoWatcher.mFifoInfoLock") {} + + mozilla::Mutex mFifoInfoLock; // protects mFifoInfo + FifoInfoArray mFifoInfo; +}; + +typedef void (*PipeCallback)(const uint8_t aRecvSig); +struct SignalInfo { + uint8_t mSignal; + PipeCallback mCallback; +}; +typedef nsTArray SignalInfoArray; + +class SignalPipeWatcher : public FdWatcher { + public: + static SignalPipeWatcher* GetSingleton(); + + void RegisterCallback(uint8_t aSignal, PipeCallback aCallback); + + void RegisterSignalHandler(uint8_t aSignal = 0); + + virtual ~SignalPipeWatcher(); + + virtual int OpenFd() override; + + virtual void StopWatching() override; + + virtual void OnFileCanReadWithoutBlocking(int aFd) override; + + private: + static mozilla::StaticRefPtr sSingleton; + + SignalPipeWatcher() : mSignalInfoLock("SignalPipeWatcher.mSignalInfoLock") { + MOZ_ASSERT(NS_IsMainThread()); + } + + mozilla::Mutex mSignalInfoLock; // protects mSignalInfo + SignalInfoArray mSignalInfo; +}; + +#endif // XP_UNIX } + +class nsDumpUtils { + public: + enum Mode { CREATE, CREATE_UNIQUE }; + + /** + * This function creates a new unique file based on |aFilename| in a + * world-readable temp directory. This is the system temp directory + * or, in the case of Android, the downloads directory. If |aFile| is + * non-null, it is assumed to point to a folder, and that folder is used + * instead. + */ + static nsresult OpenTempFile(const nsACString& aFilename, nsIFile** aFile, + const nsACString& aFoldername = ""_ns, + Mode aMode = CREATE_UNIQUE); +}; + +#endif -- cgit v1.2.3