ProcessLauncherMac.mm [plain text]
/*
* Copyright (C) 2010, 2011, 2012 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#import "config.h"
#import "ProcessLauncher.h"
#import "DynamicLinkerEnvironmentExtractor.h"
#import "EnvironmentVariables.h"
#import "WebProcess.h"
#import "WebKitSystemInterface.h"
#import <WebCore/RunLoop.h>
#import <crt_externs.h>
#import <mach-o/dyld.h>
#import <mach/machine.h>
#import <runtime/InitializeThreading.h>
#import <servers/bootstrap.h>
#import <spawn.h>
#import <sys/param.h>
#import <sys/stat.h>
#import <wtf/PassRefPtr.h>
#import <wtf/RetainPtr.h>
#import <wtf/Threading.h>
#import <wtf/text/CString.h>
#import <wtf/text/WTFString.h>
using namespace WebCore;
// FIXME: We should be doing this another way.
extern "C" kern_return_t bootstrap_register2(mach_port_t, name_t, mach_port_t, uint64_t);
namespace WebKit {
static void setUpTerminationNotificationHandler(pid_t pid)
{
#if HAVE(DISPATCH_H)
dispatch_source_t processDiedSource = dispatch_source_create(DISPATCH_SOURCE_TYPE_PROC, pid, DISPATCH_PROC_EXIT, dispatch_get_current_queue());
dispatch_source_set_event_handler(processDiedSource, ^{
int status;
waitpid(dispatch_source_get_handle(processDiedSource), &status, 0);
dispatch_source_cancel(processDiedSource);
});
dispatch_source_set_cancel_handler(processDiedSource, ^{
dispatch_release(processDiedSource);
});
dispatch_resume(processDiedSource);
#endif
}
void ProcessLauncher::launchProcess()
{
// Create the listening port.
mach_port_t listeningPort;
mach_port_allocate(mach_task_self(), MACH_PORT_RIGHT_RECEIVE, &listeningPort);
// Insert a send right so we can send to it.
mach_port_insert_right(mach_task_self(), listeningPort, listeningPort, MACH_MSG_TYPE_MAKE_SEND);
pid_t processIdentifier = 0;
EnvironmentVariables environmentVariables;
#if !defined(BUILDING_ON_SNOW_LEOPARD)
static const char* preexistingProcessServiceName = environmentVariables.get(EnvironmentVariables::preexistingProcessServiceNameKey());
ProcessType preexistingProcessType;
if (preexistingProcessServiceName)
getProcessTypeFromString(environmentVariables.get(EnvironmentVariables::preexistingProcessTypeKey()), preexistingProcessType);
bool usePreexistingProcess = preexistingProcessServiceName && preexistingProcessType == m_launchOptions.processType;
if (usePreexistingProcess) {
mach_port_t lookupPort;
bootstrap_look_up(bootstrap_port, preexistingProcessServiceName, &lookupPort);
mach_msg_header_t header;
header.msgh_bits = MACH_MSGH_BITS(MACH_MSG_TYPE_COPY_SEND, MACH_MSG_TYPE_MAKE_SEND);
header.msgh_id = 0;
header.msgh_local_port = listeningPort;
header.msgh_remote_port = lookupPort;
header.msgh_size = sizeof(header);
kern_return_t kr = mach_msg(&header, MACH_SEND_MSG, sizeof(header), 0, MACH_PORT_NULL, MACH_MSG_TIMEOUT_NONE, MACH_PORT_NULL);
if (kr) {
LOG_ERROR("Failed to pick up preexisting process at %s (%x). Launching a new process of type %s instead.", preexistingProcessServiceName, kr, processTypeAsString(m_launchOptions.processType));
usePreexistingProcess = false;
}
mach_port_deallocate(mach_task_self(), lookupPort);
preexistingProcessServiceName = 0;
}
if (!usePreexistingProcess) {
#endif
NSBundle *webKit2Bundle = [NSBundle bundleWithIdentifier:@"com.apple.WebKit2"];
NSString *frameworksPath = [[webKit2Bundle bundlePath] stringByDeletingLastPathComponent];
const char* frameworkExecutablePath = [[webKit2Bundle executablePath] fileSystemRepresentation];
NSString *processPath;
if (m_launchOptions.processType == ProcessLauncher::PluginProcess)
processPath = [webKit2Bundle pathForAuxiliaryExecutable:@"PluginProcess.app"];
else
processPath = [webKit2Bundle pathForAuxiliaryExecutable:@"WebProcess.app"];
NSString *processAppExecutablePath = [[NSBundle bundleWithPath:processPath] executablePath];
RetainPtr<CFStringRef> cfLocalization(AdoptCF, WKCopyCFLocalizationPreferredName(NULL));
CString localization = String(cfLocalization.get()).utf8();
// Make a unique, per pid, per process launcher web process service name.
CString serviceName = String::format("com.apple.WebKit.WebProcess-%d-%p", getpid(), this).utf8();
const char* args[] = { [processAppExecutablePath fileSystemRepresentation], frameworkExecutablePath, "-type", processTypeAsString(m_launchOptions.processType), "-servicename", serviceName.data(), "-localization", localization.data(), 0 };
// Register ourselves.
kern_return_t kr = bootstrap_register2(bootstrap_port, const_cast<char*>(serviceName.data()), listeningPort, 0);
ASSERT_UNUSED(kr, kr == KERN_SUCCESS);
posix_spawnattr_t attr;
posix_spawnattr_init(&attr);
short flags = 0;
// We want our process to receive all signals.
sigset_t signalMaskSet;
sigemptyset(&signalMaskSet);
posix_spawnattr_setsigmask(&attr, &signalMaskSet);
flags |= POSIX_SPAWN_SETSIGMASK;
// Determine the architecture to use.
cpu_type_t architecture = m_launchOptions.architecture;
if (architecture == LaunchOptions::MatchCurrentArchitecture)
architecture = _NSGetMachExecuteHeader()->cputype;
cpu_type_t cpuTypes[] = { architecture };
size_t outCount = 0;
posix_spawnattr_setbinpref_np(&attr, 1, cpuTypes, &outCount);
// Start suspended so we can set up the termination notification handler.
flags |= POSIX_SPAWN_START_SUSPENDED;
#ifndef BUILDING_ON_SNOW_LEOPARD
static const int allowExecutableHeapFlag = 0x2000;
if (m_launchOptions.executableHeap)
flags |= allowExecutableHeapFlag;
#endif
posix_spawnattr_setflags(&attr, flags);
#ifndef BUILDING_ON_SNOW_LEOPARD
DynamicLinkerEnvironmentExtractor environmentExtractor([[NSBundle mainBundle] executablePath], _NSGetMachExecuteHeader()->cputype);
environmentExtractor.getExtractedEnvironmentVariables(environmentVariables);
#endif
// To make engineering builds work, if the path is outside of /System set up
// DYLD_FRAMEWORK_PATH to pick up other frameworks, but don't do it for the
// production configuration because it involves extra file system access.
if (![frameworksPath hasPrefix:@"/System/"])
environmentVariables.appendValue("DYLD_FRAMEWORK_PATH", [frameworksPath fileSystemRepresentation], ':');
NSString *processShimPathNSString = nil;
if (m_launchOptions.processType == ProcessLauncher::PluginProcess)
processShimPathNSString = [[processAppExecutablePath stringByDeletingLastPathComponent] stringByAppendingPathComponent:@"PluginProcessShim.dylib"];
else if (m_launchOptions.processType == ProcessLauncher::WebProcess)
processShimPathNSString = [[processAppExecutablePath stringByDeletingLastPathComponent] stringByAppendingPathComponent:@"WebProcessShim.dylib"];
// Make sure that the shim library file exists and insert it.
if (processShimPathNSString) {
const char* processShimPath = [processShimPathNSString fileSystemRepresentation];
struct stat statBuf;
if (stat(processShimPath, &statBuf) == 0 && (statBuf.st_mode & S_IFMT) == S_IFREG)
environmentVariables.appendValue("DYLD_INSERT_LIBRARIES", processShimPath, ':');
}
int result = posix_spawn(&processIdentifier, args[0], 0, &attr, const_cast<char**>(args), environmentVariables.environmentPointer());
posix_spawnattr_destroy(&attr);
if (!result) {
// Set up the termination notification handler and then ask the child process to continue.
setUpTerminationNotificationHandler(processIdentifier);
kill(processIdentifier, SIGCONT);
} else {
// We failed to launch. Release the send right.
mach_port_deallocate(mach_task_self(), listeningPort);
// And the receive right.
mach_port_mod_refs(mach_task_self(), listeningPort, MACH_PORT_RIGHT_RECEIVE, -1);
listeningPort = MACH_PORT_NULL;
processIdentifier = 0;
}
#if !defined(BUILDING_ON_SNOW_LEOPARD)
}
#endif
// We've finished launching the process, message back to the main run loop.
RunLoop::main()->dispatch(bind(&ProcessLauncher::didFinishLaunchingProcess, this, processIdentifier, listeningPort));
}
void ProcessLauncher::terminateProcess()
{
if (!m_processIdentifier)
return;
kill(m_processIdentifier, SIGKILL);
}
void ProcessLauncher::platformInvalidate()
{
}
} // namespace WebKit