diff options
Diffstat (limited to 'xpcom/threads/nsProcessCommon.cpp')
| -rw-r--r-- | xpcom/threads/nsProcessCommon.cpp | 600 |
1 files changed, 600 insertions, 0 deletions
diff --git a/xpcom/threads/nsProcessCommon.cpp b/xpcom/threads/nsProcessCommon.cpp new file mode 100644 index 0000000000..0a88488e5f --- /dev/null +++ b/xpcom/threads/nsProcessCommon.cpp @@ -0,0 +1,600 @@ +/* -*- 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/. */ + +/***************************************************************************** + * + * nsProcess is used to execute new processes and specify if you want to + * wait (blocking) or continue (non-blocking). + * + ***************************************************************************** + */ + +#include "mozilla/ArrayUtils.h" + +#include "nsCOMPtr.h" +#include "nsIFile.h" +#include "nsProcess.h" +#include "prio.h" +#include "prenv.h" +#include "nsCRT.h" +#include "nsThreadUtils.h" +#include "nsIObserverService.h" +#include "nsXULAppAPI.h" +#include "mozilla/Services.h" + +#include <stdlib.h> + +#if defined(PROCESSMODEL_WINAPI) +# include "nsString.h" +# include "nsLiteralString.h" +# include "nsReadableUtils.h" +# include "mozilla/AssembleCmdLine.h" +# include "mozilla/UniquePtrExtensions.h" +#else +# ifdef XP_MACOSX +# include <crt_externs.h> +# include <spawn.h> +# endif +# ifdef XP_UNIX +# ifndef XP_MACOSX +# include "base/process_util.h" +# endif +# include <sys/wait.h> +# include <sys/errno.h> +# endif +# include <sys/types.h> +# include <signal.h> +#endif + +using namespace mozilla; + +//-------------------------------------------------------------------// +// nsIProcess implementation +//-------------------------------------------------------------------// +NS_IMPL_ISUPPORTS(nsProcess, nsIProcess, nsIObserver) + +// Constructor +nsProcess::nsProcess() + : mThread(nullptr), + mLock("nsProcess.mLock"), + mShutdown(false), + mBlocking(false), + mStartHidden(false), + mNoShell(false), + mPid(-1), + mExitValue(-1) +#if !defined(XP_UNIX) + , + mProcess(nullptr) +#endif +{ +} + +// Destructor +nsProcess::~nsProcess() = default; + +NS_IMETHODIMP +nsProcess::Init(nsIFile* aExecutable) { + if (mExecutable) { + return NS_ERROR_ALREADY_INITIALIZED; + } + + if (NS_WARN_IF(!aExecutable)) { + return NS_ERROR_INVALID_ARG; + } + bool isFile; + + // First make sure the file exists + nsresult rv = aExecutable->IsFile(&isFile); + if (NS_FAILED(rv)) { + return rv; + } + if (!isFile) { + return NS_ERROR_FAILURE; + } + + // Store the nsIFile in mExecutable + mExecutable = aExecutable; + // Get the path because it is needed by the NSPR process creation +#ifdef XP_WIN + rv = mExecutable->GetTarget(mTargetPath); + if (NS_FAILED(rv) || mTargetPath.IsEmpty()) +#endif + rv = mExecutable->GetPath(mTargetPath); + + return rv; +} + +void nsProcess::Monitor(void* aArg) { + RefPtr<nsProcess> process = dont_AddRef(static_cast<nsProcess*>(aArg)); + + if (!process->mBlocking) { + NS_SetCurrentThreadName("RunProcess"); + } + +#if defined(PROCESSMODEL_WINAPI) + HANDLE processHandle; + { + // The mutex region cannot include WaitForSingleObject otherwise we'll + // block calls such as Kill. So lock on access and store a local. + MutexAutoLock lock(process->mLock); + processHandle = process->mProcess; + } + + DWORD dwRetVal; + unsigned long exitCode = -1; + + dwRetVal = WaitForSingleObject(processHandle, INFINITE); + if (dwRetVal != WAIT_FAILED) { + if (GetExitCodeProcess(processHandle, &exitCode) == FALSE) { + exitCode = -1; + } + } + + // Lock in case Kill or GetExitCode are called during this. + { + MutexAutoLock lock(process->mLock); + CloseHandle(process->mProcess); + process->mProcess = nullptr; + process->mExitValue = exitCode; + if (process->mShutdown) { + return; + } + } +#else +# ifdef XP_UNIX + int exitCode = -1; + int status = 0; + pid_t result; + do { + result = waitpid(process->mPid, &status, 0); + } while (result == -1 && errno == EINTR); + if (result == process->mPid) { + if (WIFEXITED(status)) { + exitCode = WEXITSTATUS(status); + } else if (WIFSIGNALED(status)) { + exitCode = 256; // match NSPR's signal exit status + } + } +# else + int32_t exitCode = -1; + PRProcess* prProcess; + { + // The mutex region cannot include PR_WaitProcess otherwise we'll + // block calls such as Kill. So lock on access and store a local. + MutexAutoLock lock(process->mLock); + prProcess = process->mProcess; + } + if (PR_WaitProcess(prProcess, &exitCode) != PR_SUCCESS) { + exitCode = -1; + } +# endif + + // Lock in case Kill or GetExitCode are called during this + { + MutexAutoLock lock(process->mLock); +# if !defined(XP_UNIX) + process->mProcess = nullptr; +# endif + process->mExitValue = exitCode; + if (process->mShutdown) { + return; + } + } +#endif + + // If we ran a background thread for the monitor then notify on the main + // thread + if (NS_IsMainThread()) { + process->ProcessComplete(); + } else { + NS_DispatchToMainThread(NewRunnableMethod( + "nsProcess::ProcessComplete", process, &nsProcess::ProcessComplete)); + } +} + +void nsProcess::ProcessComplete() { + if (mThread) { + nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService(); + if (os) { + os->RemoveObserver(this, "xpcom-shutdown"); + } + PR_JoinThread(mThread); + mThread = nullptr; + } + + const char* topic; + { + MutexAutoLock lock(mLock); + if (mExitValue != 0) { + topic = "process-failed"; + } else { + topic = "process-finished"; + } + } + + mPid = -1; + nsCOMPtr<nsIObserver> observer = mObserver.GetValue(); + mObserver = nullptr; + + if (observer) { + observer->Observe(NS_ISUPPORTS_CAST(nsIProcess*, this), topic, nullptr); + } +} + +// XXXldb |aArgs| has the wrong const-ness +NS_IMETHODIMP +nsProcess::Run(bool aBlocking, const char** aArgs, uint32_t aCount) { + return CopyArgsAndRunProcess(aBlocking, aArgs, aCount, nullptr, false); +} + +// XXXldb |aArgs| has the wrong const-ness +NS_IMETHODIMP +nsProcess::RunAsync(const char** aArgs, uint32_t aCount, nsIObserver* aObserver, + bool aHoldWeak) { + return CopyArgsAndRunProcess(false, aArgs, aCount, aObserver, aHoldWeak); +} + +nsresult nsProcess::CopyArgsAndRunProcess(bool aBlocking, const char** aArgs, + uint32_t aCount, + nsIObserver* aObserver, + bool aHoldWeak) { + // Add one to the aCount for the program name and one for null termination. + char** my_argv = nullptr; + my_argv = (char**)moz_xmalloc(sizeof(char*) * (aCount + 2)); + + my_argv[0] = ToNewUTF8String(mTargetPath); + + for (uint32_t i = 0; i < aCount; ++i) { + my_argv[i + 1] = const_cast<char*>(aArgs[i]); + } + + my_argv[aCount + 1] = nullptr; + + nsresult rv = RunProcess(aBlocking, my_argv, aObserver, aHoldWeak, false); + + free(my_argv[0]); + free(my_argv); + return rv; +} + +// XXXldb |aArgs| has the wrong const-ness +NS_IMETHODIMP +nsProcess::Runw(bool aBlocking, const char16_t** aArgs, uint32_t aCount) { + return CopyArgsAndRunProcessw(aBlocking, aArgs, aCount, nullptr, false); +} + +// XXXldb |aArgs| has the wrong const-ness +NS_IMETHODIMP +nsProcess::RunwAsync(const char16_t** aArgs, uint32_t aCount, + nsIObserver* aObserver, bool aHoldWeak) { + return CopyArgsAndRunProcessw(false, aArgs, aCount, aObserver, aHoldWeak); +} + +nsresult nsProcess::CopyArgsAndRunProcessw(bool aBlocking, + const char16_t** aArgs, + uint32_t aCount, + nsIObserver* aObserver, + bool aHoldWeak) { + // Add one to the aCount for the program name and one for null termination. + char** my_argv = nullptr; + my_argv = (char**)moz_xmalloc(sizeof(char*) * (aCount + 2)); + + my_argv[0] = ToNewUTF8String(mTargetPath); + + for (uint32_t i = 0; i < aCount; i++) { + my_argv[i + 1] = ToNewUTF8String(nsDependentString(aArgs[i])); + } + + my_argv[aCount + 1] = nullptr; + + nsresult rv = RunProcess(aBlocking, my_argv, aObserver, aHoldWeak, true); + + for (uint32_t i = 0; i <= aCount; ++i) { + free(my_argv[i]); + } + free(my_argv); + return rv; +} + +nsresult nsProcess::RunProcess(bool aBlocking, char** aMyArgv, + nsIObserver* aObserver, bool aHoldWeak, + bool aArgsUTF8) { + NS_WARNING_ASSERTION(!XRE_IsContentProcess(), + "No launching of new processes in the content process"); + + if (NS_WARN_IF(!mExecutable)) { + return NS_ERROR_NOT_INITIALIZED; + } + if (NS_WARN_IF(mThread)) { + return NS_ERROR_ALREADY_INITIALIZED; + } + + if (aObserver) { + if (aHoldWeak) { + nsresult rv = NS_OK; + mObserver = do_GetWeakReference(aObserver, &rv); + NS_ENSURE_SUCCESS(rv, rv); + } else { + mObserver = aObserver; + } + } + + { + MutexAutoLock lock(mLock); + mExitValue = -1; + mPid = -1; + } + +#if defined(PROCESSMODEL_WINAPI) + BOOL retVal; + UniqueFreePtr<wchar_t> cmdLine; + + // |aMyArgv| is null-terminated and always starts with the program path. If + // the second slot is non-null then arguments are being passed. + if (aMyArgv[1] || mNoShell) { + // Pass the executable path as argv[0] to the launched program when calling + // CreateProcess(). + char** argv = mNoShell ? aMyArgv : aMyArgv + 1; + + wchar_t* assembledCmdLine = nullptr; + if (assembleCmdLine(argv, &assembledCmdLine, + aArgsUTF8 ? CP_UTF8 : CP_ACP) == -1) { + return NS_ERROR_FILE_EXECUTION_FAILED; + } + cmdLine.reset(assembledCmdLine); + } + + // The program name in aMyArgv[0] is always UTF-8 + NS_ConvertUTF8toUTF16 wideFile(aMyArgv[0]); + + if (mNoShell) { + STARTUPINFO startupInfo; + ZeroMemory(&startupInfo, sizeof(startupInfo)); + startupInfo.cb = sizeof(startupInfo); + startupInfo.dwFlags = STARTF_USESHOWWINDOW; + startupInfo.wShowWindow = mStartHidden ? SW_HIDE : SW_SHOWNORMAL; + + PROCESS_INFORMATION processInfo; + retVal = CreateProcess(/* lpApplicationName = */ wideFile.get(), + /* lpCommandLine */ cmdLine.get(), + /* lpProcessAttributes = */ NULL, + /* lpThreadAttributes = */ NULL, + /* bInheritHandles = */ FALSE, + /* dwCreationFlags = */ 0, + /* lpEnvironment = */ NULL, + /* lpCurrentDirectory = */ NULL, + /* lpStartupInfo = */ &startupInfo, + /* lpProcessInformation */ &processInfo); + + if (!retVal) { + return NS_ERROR_FILE_EXECUTION_FAILED; + } + + CloseHandle(processInfo.hThread); + + // TODO(bug 1763051): assess if we need further work around this locking. + MutexAutoLock lock(mLock); + mProcess = processInfo.hProcess; + } else { + SHELLEXECUTEINFOW sinfo; + memset(&sinfo, 0, sizeof(SHELLEXECUTEINFOW)); + sinfo.cbSize = sizeof(SHELLEXECUTEINFOW); + sinfo.hwnd = nullptr; + sinfo.lpFile = wideFile.get(); + sinfo.nShow = mStartHidden ? SW_HIDE : SW_SHOWNORMAL; + + /* The SEE_MASK_NO_CONSOLE flag is important to prevent console windows + * from appearing. This makes behavior the same on all platforms. The flag + * will not have any effect on non-console applications. + */ + sinfo.fMask = + SEE_MASK_FLAG_DDEWAIT | SEE_MASK_NO_CONSOLE | SEE_MASK_NOCLOSEPROCESS; + + if (cmdLine) { + sinfo.lpParameters = cmdLine.get(); + } + + retVal = ShellExecuteExW(&sinfo); + if (!retVal) { + return NS_ERROR_FILE_EXECUTION_FAILED; + } + + MutexAutoLock lock(mLock); + mProcess = sinfo.hProcess; + } + + { + MutexAutoLock lock(mLock); + mPid = GetProcessId(mProcess); + } +#elif defined(XP_MACOSX) + // Note: |aMyArgv| is already null-terminated as required by posix_spawnp. + pid_t newPid = 0; + int result = posix_spawnp(&newPid, aMyArgv[0], nullptr, nullptr, aMyArgv, + *_NSGetEnviron()); + mPid = static_cast<int32_t>(newPid); + + if (result != 0) { + return NS_ERROR_FAILURE; + } +#elif defined(XP_UNIX) + base::LaunchOptions options; + std::vector<std::string> argvVec; + for (char** arg = aMyArgv; *arg != nullptr; ++arg) { + argvVec.push_back(*arg); + } + pid_t newPid; + if (base::LaunchApp(argvVec, options, &newPid).isOk()) { + static_assert(sizeof(pid_t) <= sizeof(int32_t), + "mPid is large enough to hold a pid"); + mPid = static_cast<int32_t>(newPid); + } else { + return NS_ERROR_FAILURE; + } +#else + { + PRProcess* prProcess = + PR_CreateProcess(aMyArgv[0], aMyArgv, nullptr, nullptr); + if (!prProcess) { + return NS_ERROR_FAILURE; + } + { + MutexAutoLock lock(mLock); + mProcess = prProcess; + } + struct MYProcess { + uint32_t pid; + }; + MYProcess* ptrProc = (MYProcess*)mProcess; + mPid = ptrProc->pid; + } +#endif + + NS_ADDREF_THIS(); + mBlocking = aBlocking; + if (aBlocking) { + Monitor(this); + MutexAutoLock lock(mLock); + if (mExitValue < 0) { + return NS_ERROR_FILE_EXECUTION_FAILED; + } + } else { + mThread = CreateMonitorThread(); + if (!mThread) { + NS_RELEASE_THIS(); + return NS_ERROR_FAILURE; + } + + // It isn't a failure if we just can't watch for shutdown + nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService(); + if (os) { + os->AddObserver(this, "xpcom-shutdown", false); + } + } + + return NS_OK; +} + +// We don't guarantee that monitor threads are joined before Gecko exits, which +// can cause TSAN to complain about thread leaks. We handle this with a TSAN +// suppression, and route thread creation through this helper so that the +// suppression is as narrowly-scoped as possible. +PRThread* nsProcess::CreateMonitorThread() { + return PR_CreateThread(PR_SYSTEM_THREAD, Monitor, this, PR_PRIORITY_NORMAL, + PR_GLOBAL_THREAD, PR_JOINABLE_THREAD, 0); +} + +NS_IMETHODIMP +nsProcess::GetIsRunning(bool* aIsRunning) { + if (mThread) { + *aIsRunning = true; + } else { + *aIsRunning = false; + } + + return NS_OK; +} + +NS_IMETHODIMP +nsProcess::GetStartHidden(bool* aStartHidden) { + *aStartHidden = mStartHidden; + return NS_OK; +} + +NS_IMETHODIMP +nsProcess::SetStartHidden(bool aStartHidden) { + mStartHidden = aStartHidden; + return NS_OK; +} + +NS_IMETHODIMP +nsProcess::GetNoShell(bool* aNoShell) { + *aNoShell = mNoShell; + return NS_OK; +} + +NS_IMETHODIMP +nsProcess::SetNoShell(bool aNoShell) { + mNoShell = aNoShell; + return NS_OK; +} + +NS_IMETHODIMP +nsProcess::GetPid(uint32_t* aPid) { + if (!mThread) { + return NS_ERROR_FAILURE; + } + if (mPid < 0) { + return NS_ERROR_NOT_IMPLEMENTED; + } + *aPid = mPid; + return NS_OK; +} + +NS_IMETHODIMP +nsProcess::Kill() { + if (!mThread) { + return NS_ERROR_FAILURE; + } + + { + MutexAutoLock lock(mLock); +#if defined(PROCESSMODEL_WINAPI) + if (TerminateProcess(mProcess, 0) == 0) { + return NS_ERROR_FAILURE; + } +#elif defined(XP_UNIX) + if (kill(mPid, SIGKILL) != 0) { + return NS_ERROR_FAILURE; + } +#else + if (!mProcess || (PR_KillProcess(mProcess) != PR_SUCCESS)) { + return NS_ERROR_FAILURE; + } +#endif + } + + // We must null out mThread if we want IsRunning to return false immediately + // after this call. + nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService(); + if (os) { + os->RemoveObserver(this, "xpcom-shutdown"); + } + PR_JoinThread(mThread); + mThread = nullptr; + + return NS_OK; +} + +NS_IMETHODIMP +nsProcess::GetExitValue(int32_t* aExitValue) { + MutexAutoLock lock(mLock); + + *aExitValue = mExitValue; + + return NS_OK; +} + +NS_IMETHODIMP +nsProcess::Observe(nsISupports* aSubject, const char* aTopic, + const char16_t* aData) { + // Shutting down, drop all references + if (mThread) { + nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService(); + if (os) { + os->RemoveObserver(this, "xpcom-shutdown"); + } + mThread = nullptr; + } + + mObserver = nullptr; + + MutexAutoLock lock(mLock); + mShutdown = true; + + return NS_OK; +} |