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gecko/xpcom/threads/nsProcessCommon.cpp

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Communicator client code, released
* March 31, 1998.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998-1999
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Don Bragg <dbragg@netscape.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/*****************************************************************************
*
* nsProcess is used to execute new processes and specify if you want to
* wait (blocking) or continue (non-blocking).
*
*****************************************************************************
*/
#include "nsCOMPtr.h"
#include "nsAutoPtr.h"
#include "nsMemory.h"
#include "nsProcess.h"
#include "prtypes.h"
#include "prio.h"
#include "prenv.h"
#include "nsCRT.h"
#include "nsAutoLock.h"
#include "nsThreadUtils.h"
#include "nsIObserverService.h"
#include <stdlib.h>
#if defined(PROCESSMODEL_WINAPI)
#include "prmem.h"
#include "nsString.h"
#include "nsLiteralString.h"
#include "nsReadableUtils.h"
#else
#include <sys/types.h>
#include <signal.h>
#endif
#ifdef WINCE
#include <windows.h> // for MultiByteToWideChar
#include "prmem.h"
#endif
//-------------------------------------------------------------------//
// nsIProcess implementation
//-------------------------------------------------------------------//
NS_IMPL_THREADSAFE_ISUPPORTS2(nsProcess, nsIProcess,
nsIObserver)
//Constructor
nsProcess::nsProcess()
: mThread(nsnull),
mLock(PR_NewLock()),
mShutdown(PR_FALSE),
mPid(-1),
mObserver(nsnull),
mWeakObserver(nsnull),
mExitValue(-1),
mProcess(nsnull)
{
}
//Destructor
nsProcess::~nsProcess()
{
PR_DestroyLock(mLock);
}
NS_IMETHODIMP
nsProcess::Init(nsIFile* executable)
{
if (mExecutable)
return NS_ERROR_ALREADY_INITIALIZED;
NS_ENSURE_ARG_POINTER(executable);
PRBool isFile;
//First make sure the file exists
nsresult rv = executable->IsFile(&isFile);
if (NS_FAILED(rv)) return rv;
if (!isFile)
return NS_ERROR_FAILURE;
//Store the nsIFile in mExecutable
mExecutable = executable;
//Get the path because it is needed by the NSPR process creation
#ifdef XP_WIN
rv = mExecutable->GetNativeTarget(mTargetPath);
if (NS_FAILED(rv) || mTargetPath.IsEmpty() )
#endif
rv = mExecutable->GetNativePath(mTargetPath);
return rv;
}
#if defined(XP_WIN)
// Out param `wideCmdLine` must be PR_Freed by the caller.
static int assembleCmdLine(char *const *argv, PRUnichar **wideCmdLine)
{
char *const *arg;
char *p, *q, *cmdLine;
int cmdLineSize;
int numBackslashes;
int i;
int argNeedQuotes;
/*
* Find out how large the command line buffer should be.
*/
cmdLineSize = 0;
for (arg = argv; *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 == NULL) {
return -1;
}
for (arg = argv; *arg; arg++) {
/* Add a space to separates the arguments */
if (arg != argv) {
*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';
PRInt32 numChars = MultiByteToWideChar(CP_ACP, 0, cmdLine, -1, NULL, 0);
*wideCmdLine = (PRUnichar *) PR_MALLOC(numChars*sizeof(PRUnichar));
MultiByteToWideChar(CP_ACP, 0, cmdLine, -1, *wideCmdLine, numChars);
PR_Free(cmdLine);
return 0;
}
#endif
void PR_CALLBACK nsProcess::Monitor(void *arg)
{
nsRefPtr<nsProcess> process = dont_AddRef(static_cast<nsProcess*>(arg));
#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
{
nsAutoLock lock(process->mLock);
CloseHandle(process->mProcess);
process->mProcess = NULL;
process->mExitValue = exitCode;
if (process->mShutdown)
return;
}
#else
PRInt32 exitCode = -1;
if (PR_WaitProcess(process->mProcess, &exitCode) != PR_SUCCESS)
exitCode = -1;
// Lock in case Kill or GetExitCode are called during this
{
nsAutoLock lock(process->mLock);
process->mProcess = nsnull;
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 {
nsCOMPtr<nsIRunnable> event = new nsRunnableMethod<nsProcess>(process, &nsProcess::ProcessComplete);
NS_DispatchToMainThread(event);
}
}
void nsProcess::ProcessComplete()
{
if (mThread) {
nsCOMPtr<nsIObserverService> os = do_GetService("@mozilla.org/observer-service;1");
if (os)
os->RemoveObserver(this, "xpcom-shutdown");
PR_JoinThread(mThread);
mThread = nsnull;
}
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 = nsnull;
mWeakObserver = nsnull;
if (observer)
observer->Observe(NS_ISUPPORTS_CAST(nsIProcess*, this), topic, nsnull);
}
// XXXldb |args| has the wrong const-ness
NS_IMETHODIMP
nsProcess::Run(PRBool blocking, const char **args, PRUint32 count)
{
return RunProcess(blocking, args, count, nsnull, PR_FALSE);
}
// XXXldb |args| has the wrong const-ness
NS_IMETHODIMP
nsProcess::RunAsync(const char **args, PRUint32 count,
nsIObserver* observer, PRBool holdWeak)
{
return RunProcess(PR_FALSE, args, count, observer, holdWeak);
}
NS_IMETHODIMP
nsProcess::RunProcess(PRBool blocking, const char **args, PRUint32 count,
nsIObserver* observer, PRBool holdWeak)
{
NS_ENSURE_TRUE(mExecutable, NS_ERROR_NOT_INITIALIZED);
NS_ENSURE_FALSE(mThread, NS_ERROR_ALREADY_INITIALIZED);
if (observer) {
if (holdWeak) {
mWeakObserver = do_GetWeakReference(observer);
if (!mWeakObserver)
return NS_NOINTERFACE;
}
else {
mObserver = observer;
}
}
mExitValue = -1;
mPid = -1;
// make sure that when we allocate we have 1 greater than the
// count since we need to null terminate the list for the argv to
// pass into PR_CreateProcess
char **my_argv = NULL;
my_argv = (char **)nsMemory::Alloc(sizeof(char *) * (count + 2) );
if (!my_argv) {
return NS_ERROR_OUT_OF_MEMORY;
}
// copy the args
PRUint32 i;
for (i=0; i < count; i++) {
my_argv[i+1] = const_cast<char*>(args[i]);
}
// we need to set argv[0] to the program name.
my_argv[0] = mTargetPath.BeginWriting();
// null terminate the array
my_argv[count+1] = NULL;
#if defined(PROCESSMODEL_WINAPI)
BOOL retVal;
PRUnichar *cmdLine;
if (count > 0 && assembleCmdLine(my_argv + 1, &cmdLine) == -1) {
nsMemory::Free(my_argv);
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.
*/
PRInt32 numChars = MultiByteToWideChar(CP_ACP, 0, my_argv[0], -1, NULL, 0);
PRUnichar* wideFile = (PRUnichar *) PR_MALLOC(numChars * sizeof(PRUnichar));
MultiByteToWideChar(CP_ACP, 0, my_argv[0], -1, wideFile, numChars);
nsMemory::Free(my_argv);
SHELLEXECUTEINFOW sinfo;
memset(&sinfo, 0, sizeof(SHELLEXECUTEINFOW));
sinfo.cbSize = sizeof(SHELLEXECUTEINFOW);
sinfo.hwnd = NULL;
sinfo.lpFile = wideFile;
sinfo.nShow = SW_SHOWNORMAL;
sinfo.fMask = SEE_MASK_FLAG_DDEWAIT |
SEE_MASK_NO_CONSOLE |
SEE_MASK_NOCLOSEPROCESS;
if (count > 0)
sinfo.lpParameters = cmdLine;
retVal = ShellExecuteExW(&sinfo);
if (!retVal) {
return NS_ERROR_FILE_EXECUTION_FAILED;
}
mProcess = sinfo.hProcess;
PR_Free(wideFile);
if (count > 0)
PR_Free( cmdLine );
HMODULE kernelDLL = ::LoadLibraryW(L"kernel32.dll");
if (kernelDLL) {
GetProcessIdPtr getProcessId = (GetProcessIdPtr)GetProcAddress(kernelDLL, "GetProcessId");
if (getProcessId)
mPid = getProcessId(mProcess);
FreeLibrary(kernelDLL);
}
#else // Note, this must not be an #elif ...!
mProcess = PR_CreateProcess(mTargetPath.get(), my_argv, NULL, NULL);
nsMemory::Free(my_argv);
if (!mProcess)
return NS_ERROR_FAILURE;
#if !defined WINCE
struct MYProcess {
PRUint32 pid;
};
MYProcess* ptrProc = (MYProcess *) mProcess;
mPid = ptrProc->pid;
#endif
#endif
NS_ADDREF_THIS();
if (blocking) {
Monitor(this);
if (mExitValue < 0)
return NS_ERROR_FILE_EXECUTION_FAILED;
}
else {
mThread = PR_CreateThread(PR_SYSTEM_THREAD, Monitor, this,
PR_PRIORITY_NORMAL, PR_LOCAL_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 = do_GetService("@mozilla.org/observer-service;1");
if (os)
os->AddObserver(this, "xpcom-shutdown", PR_FALSE);
}
return NS_OK;
}
NS_IMETHODIMP nsProcess::GetIsRunning(PRBool *aIsRunning)
{
if (mThread)
*aIsRunning = PR_TRUE;
else
*aIsRunning = PR_FALSE;
return NS_OK;
}
NS_IMETHODIMP
nsProcess::GetPid(PRUint32 *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;
{
nsAutoLock lock(mLock);
#if defined(PROCESSMODEL_WINAPI)
if (TerminateProcess(mProcess, NULL) == 0)
return NS_ERROR_FAILURE;
#else
if (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 = do_GetService("@mozilla.org/observer-service;1");
if (os)
os->RemoveObserver(this, "xpcom-shutdown");
PR_JoinThread(mThread);
mThread = nsnull;
return NS_OK;
}
NS_IMETHODIMP
nsProcess::GetExitValue(PRInt32 *aExitValue)
{
nsAutoLock lock(mLock);
*aExitValue = mExitValue;
return NS_OK;
}
NS_IMETHODIMP
nsProcess::Observe(nsISupports* subject, const char* topic, const PRUnichar* data)
{
// Shutting down, drop all references
if (mThread) {
nsCOMPtr<nsIObserverService> os = do_GetService("@mozilla.org/observer-service;1");
if (os)
os->RemoveObserver(this, "xpcom-shutdown");
mThread = nsnull;
}
mObserver = nsnull;
mWeakObserver = nsnull;
nsAutoLock lock(mLock);
mShutdown = PR_TRUE;
return NS_OK;
}
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