// gcc -Wall -arch i386 -arch ppc -mmacosx-version-min=10.4 -framework AppKit -framework Carbon -weak_framework ScriptingBridge -o reload reload.m 2>&1 | egrep -v "(In file included from reload.m:8:)|(Mac OS X version 10.5 or later is needed for use of property)"
 
#import <AppKit/AppKit.h>
#import <Carbon/Carbon.h>
 
// Generate this header with
// sdef "/Applications/System Preferences.app" | sdp -fh --basename SystemPreferences
#import "SystemPreferences.h"
 
@interface TerminationListener : NSObject
{
    const char *prefPaneIdentifier;
    pid_t parentProcessId;
}
 
- (void) reload;
- (void) exit;
 
@end
 
@implementation TerminationListener
 
- (id) initWithPrefPaneIdentifier:(const char *)paneId parentProcessId:(pid_t)ppid
{
    self = [super init];
    if (self != nil) {
        prefPaneIdentifier = paneId ;
        parentProcessId = ppid;
 
        // This adds the input source required by the run loop
        [[[NSWorkspace sharedWorkspace] notificationCenter] addObserver:self selector:@selector(applicationDidTerminate:) name:NSWorkspaceDidTerminateApplicationNotification object:nil];
        if (getppid() == 1) {
            // ppid is launchd (1) => parent terminated already
            [self reload];
        }
    }
    return self;
}
 
- (void) applicationDidTerminate:(NSNotification *)notification
{
    if (parentProcessId == [[[notification userInfo] valueForKey:@"NSApplicationProcessIdentifier"] intValue]) {
        // parent just terminated
        [self reload];
    }
}
 
- (void) applicationDidLaunch:(NSNotification *)notification
{
    NSDictionary *notificationInfo = [notification userInfo];
    if ([[notificationInfo valueForKey:@"NSApplicationName"] isEqualToString:@"System Preferences"]) {
        // System Preferences just relaunched
        ProcessSerialNumber psn = {[[notificationInfo valueForKey:@"NSApplicationProcessSerialNumberHigh"] intValue], [[notificationInfo valueForKey:@"NSApplicationProcessSerialNumberLow"] intValue]};
        SetFrontProcess(&psn);
 
        // Load the pref pane by sending the appropriate apple event
        AppleEvent event = {typeNull, NULL};
        NSString *gizmo = [NSString stringWithFormat:@"'data':obj{'form':enum('ID  '), 'want':type('xppb'), 'seld':\"%s\", 'from':'null'()}, '----':obj{'form':enum('prop'), 'want':type('prop'), 'seld':type('xpcp'), 'from':'null'()}", prefPaneIdentifier];
        AEBuildAppleEvent(kAECoreSuite, kAESetData, typeProcessSerialNumber, &psn, sizeof(psn), kAutoGenerateReturnID, kAnyTransactionID, &event, NULL, [gizmo UTF8String]);
        AESend(&event, NULL, kAENoReply, kAENormalPriority, kAEDefaultTimeout, NULL, NULL);
        AEDisposeDesc(&event);
 
        [self exit];
    }
}
 
- (void) reload
{
    if (NSClassFromString(@"SBApplication")) {
        SystemPreferencesApplication *SystemPreferences = [SBApplication applicationWithBundleIdentifier:@"com.apple.systempreferences"];
 
        @try {
            [SystemPreferences activate];
            SystemPreferences.currentPane = [SystemPreferences.panes objectWithID:[NSString stringWithCString:prefPaneIdentifier encoding:NSUTF8StringEncoding]];
        } @catch (NSException *exception) {
            NSLog(@"%@", [exception description]);
        }
        [self exit];
    } else {
        [[[NSWorkspace sharedWorkspace] notificationCenter] addObserver:self selector:@selector(applicationDidLaunch:) name:NSWorkspaceDidLaunchApplicationNotification object:nil];
        if (![[NSWorkspace sharedWorkspace] launchApplication:@"System Preferences"]) {
            [self exit];
        }
    }
}
 
- (void) exit
{
    /* As it is impossible to get the right combination of 
       {[NSApp stop:self] call, [NSApp abortModal] call, [NSApp terminate:self] call, on Tiger, on Leopard, from Terminal, from NSTask} 
       to work (that is, exit the run loop), just call the more radical exit() function. */ 
    exit(0);
}
 
@end
 
int main (int argc, const char * argv[])
{
    if (argc != 3) return EXIT_FAILURE;
 
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
 
    [[[TerminationListener alloc] initWithPrefPaneIdentifier:argv[1] parentProcessId:atoi(argv[2])] autorelease];
    [[NSApplication sharedApplication] run];
 
    [pool release];
 
    return EXIT_SUCCESS;
}