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gecko-dev/xpcom/threads/nsProcessCommon.cpp

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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/. */
/*****************************************************************************
*
* 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 "nsAutoPtr.h"
#include "nsMemory.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 "prmem.h"
#include "nsString.h"
#include "nsLiteralString.h"
#include "nsReadableUtils.h"
#else
#ifdef XP_MACOSX
#include <crt_externs.h>
#include <spawn.h>
#include <sys/wait.h>
#include <sys/errno.h>
#endif
#include <sys/types.h>
#include <signal.h>
#endif
using namespace mozilla;
#ifdef XP_MACOSX
cpu_type_t pref_cpu_types[2] = {
#if defined(__i386__)
CPU_TYPE_X86,
#elif defined(__x86_64__)
CPU_TYPE_X86_64,
#elif defined(__ppc__)
CPU_TYPE_POWERPC,
#endif
CPU_TYPE_ANY
};
#endif
//-------------------------------------------------------------------//
// nsIProcess implementation
//-------------------------------------------------------------------//
NS_IMPL_ISUPPORTS(nsProcess, nsIProcess,
nsIObserver)
//Constructor
nsProcess::nsProcess()
: mThread(nullptr)
, mLock("nsProcess.mLock")
, mShutdown(false)
, mBlocking(false)
, mPid(-1)
, mObserver(nullptr)
, mWeakObserver(nullptr)
, mExitValue(-1)
#if !defined(XP_MACOSX)
, mProcess(nullptr)
#endif
{
}
//Destructor
nsProcess::~nsProcess()
{
}
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;
}
#if defined(XP_WIN)
// Out param `aWideCmdLine` must be PR_Freed by the caller.
static int
assembleCmdLine(char* const* aArgv, wchar_t** aWideCmdLine, UINT aCodePage)
{
char* const* arg;
char* p;
char* q;
char* cmdLine;
int cmdLineSize;
int numBackslashes;
int i;
int argNeedQuotes;
/*
* Find out how large the command line buffer should be.
*/
cmdLineSize = 0;
for (arg = aArgv; *arg; ++arg) {
/*
* \ and " need to be escaped by a \. In the worst case,
* every character is a \ or ", so the string of length
* may double. If we quote an argument, that needs two ".
* Finally, we need a space between arguments, and
* a null byte at the end of command line.
*/
cmdLineSize += 2 * strlen(*arg) /* \ and " need to be escaped */
+ 2 /* we quote every argument */
+ 1; /* space in between, or final null */
}
p = cmdLine = (char*)PR_MALLOC(cmdLineSize * sizeof(char));
if (!p) {
return -1;
}
for (arg = aArgv; *arg; ++arg) {
/* Add a space to separates the arguments */
if (arg != aArgv) {
*p++ = ' ';
}
q = *arg;
numBackslashes = 0;
argNeedQuotes = 0;
/* If the argument contains white space, it needs to be quoted. */
if (strpbrk(*arg, " \f\n\r\t\v")) {
argNeedQuotes = 1;
}
if (argNeedQuotes) {
*p++ = '"';
}
while (*q) {
if (*q == '\\') {
numBackslashes++;
q++;
} else if (*q == '"') {
if (numBackslashes) {
/*
* Double the backslashes since they are followed
* by a quote
*/
for (i = 0; i < 2 * numBackslashes; i++) {
*p++ = '\\';
}
numBackslashes = 0;
}
/* To escape the quote */
*p++ = '\\';
*p++ = *q++;
} else {
if (numBackslashes) {
/*
* Backslashes are not followed by a quote, so
* don't need to double the backslashes.
*/
for (i = 0; i < numBackslashes; i++) {
*p++ = '\\';
}
numBackslashes = 0;
}
*p++ = *q++;
}
}
/* Now we are at the end of this argument */
if (numBackslashes) {
/*
* Double the backslashes if we have a quote string
* delimiter at the end.
*/
if (argNeedQuotes) {
numBackslashes *= 2;
}
for (i = 0; i < numBackslashes; i++) {
*p++ = '\\';
}
}
if (argNeedQuotes) {
*p++ = '"';
}
}
*p = '\0';
int32_t numChars = MultiByteToWideChar(aCodePage, 0, cmdLine, -1, nullptr, 0);
*aWideCmdLine = (wchar_t*)PR_MALLOC(numChars * sizeof(wchar_t));
MultiByteToWideChar(aCodePage, 0, cmdLine, -1, *aWideCmdLine, numChars);
PR_Free(cmdLine);
return 0;
}
#endif
void
nsProcess::Monitor(void* aArg)
{
RefPtr<nsProcess> process = dont_AddRef(static_cast<nsProcess*>(aArg));
if (!process->mBlocking) {
PR_SetCurrentThreadName("RunProcess");
}
#if defined(PROCESSMODEL_WINAPI)
DWORD dwRetVal;
unsigned long exitCode = -1;
dwRetVal = WaitForSingleObject(process->mProcess, INFINITE);
if (dwRetVal != WAIT_FAILED) {
if (GetExitCodeProcess(process->mProcess, &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_MACOSX
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;
if (PR_WaitProcess(process->mProcess, &exitCode) != PR_SUCCESS) {
exitCode = -1;
}
#endif
// Lock in case Kill or GetExitCode are called during this
{
MutexAutoLock lock(process->mLock);
#if !defined(XP_MACOSX)
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(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;
if (mExitValue < 0) {
topic = "process-failed";
} else {
topic = "process-finished";
}
mPid = -1;
nsCOMPtr<nsIObserver> observer;
if (mWeakObserver) {
observer = do_QueryReferent(mWeakObserver);
} else if (mObserver) {
observer = mObserver;
}
mObserver = nullptr;
mWeakObserver = 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));
if (!my_argv) {
return NS_ERROR_OUT_OF_MEMORY;
}
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));
if (!my_argv) {
return NS_ERROR_OUT_OF_MEMORY;
}
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) {
mWeakObserver = do_GetWeakReference(aObserver);
if (!mWeakObserver) {
return NS_NOINTERFACE;
}
} else {
mObserver = aObserver;
}
}
mExitValue = -1;
mPid = -1;
#if defined(PROCESSMODEL_WINAPI)
BOOL retVal;
wchar_t* cmdLine = nullptr;
// |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] && assembleCmdLine(aMyArgv + 1, &cmdLine,
aArgsUTF8 ? CP_UTF8 : CP_ACP) == -1) {
return NS_ERROR_FILE_EXECUTION_FAILED;
}
/* 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.
*/
// The program name in aMyArgv[0] is always UTF-8
NS_ConvertUTF8toUTF16 wideFile(aMyArgv[0]);
SHELLEXECUTEINFOW sinfo;
memset(&sinfo, 0, sizeof(SHELLEXECUTEINFOW));
sinfo.cbSize = sizeof(SHELLEXECUTEINFOW);
sinfo.hwnd = nullptr;
sinfo.lpFile = wideFile.get();
sinfo.nShow = SW_SHOWNORMAL;
sinfo.fMask = SEE_MASK_FLAG_DDEWAIT |
SEE_MASK_NO_CONSOLE |
SEE_MASK_NOCLOSEPROCESS;
if (cmdLine) {
sinfo.lpParameters = cmdLine;
}
retVal = ShellExecuteExW(&sinfo);
if (!retVal) {
return NS_ERROR_FILE_EXECUTION_FAILED;
}
mProcess = sinfo.hProcess;
if (cmdLine) {
PR_Free(cmdLine);
}
mPid = GetProcessId(mProcess);
#elif defined(XP_MACOSX)
// Initialize spawn attributes.
posix_spawnattr_t spawnattr;
if (posix_spawnattr_init(&spawnattr) != 0) {
return NS_ERROR_FAILURE;
}
// Set spawn attributes.
size_t attr_count = ArrayLength(pref_cpu_types);
size_t attr_ocount = 0;
if (posix_spawnattr_setbinpref_np(&spawnattr, attr_count, pref_cpu_types,
&attr_ocount) != 0 ||
attr_ocount != attr_count) {
posix_spawnattr_destroy(&spawnattr);
return NS_ERROR_FAILURE;
}
// Note: |aMyArgv| is already null-terminated as required by posix_spawnp.
pid_t newPid = 0;
int result = posix_spawnp(&newPid, aMyArgv[0], nullptr, &spawnattr, aMyArgv,
*_NSGetEnviron());
mPid = static_cast<int32_t>(newPid);
posix_spawnattr_destroy(&spawnattr);
if (result != 0) {
return NS_ERROR_FAILURE;
}
#else
mProcess = PR_CreateProcess(aMyArgv[0], aMyArgv, nullptr, nullptr);
if (!mProcess) {
return NS_ERROR_FAILURE;
}
struct MYProcess
{
uint32_t pid;
};
MYProcess* ptrProc = (MYProcess*)mProcess;
mPid = ptrProc->pid;
#endif
NS_ADDREF_THIS();
mBlocking = aBlocking;
if (aBlocking) {
Monitor(this);
if (mExitValue < 0) {
return NS_ERROR_FILE_EXECUTION_FAILED;
}
} else {
mThread = PR_CreateThread(PR_SYSTEM_THREAD, Monitor, this,
PR_PRIORITY_NORMAL, PR_GLOBAL_THREAD,
PR_JOINABLE_THREAD, 0);
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;
}
NS_IMETHODIMP
nsProcess::GetIsRunning(bool* aIsRunning)
{
if (mThread) {
*aIsRunning = true;
} else {
*aIsRunning = false;
}
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_MACOSX)
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;
mWeakObserver = nullptr;
MutexAutoLock lock(mLock);
mShutdown = true;
return NS_OK;
}
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