PreLoginAgentCocoa/main.m

/*
     File: main.m
 Abstract: Application main.
  Version: 1.1
 
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 */
 
#import <Cocoa/Cocoa.h>
 
#import "LogManager.h"
 
static void WaitForWindowServerSession(void)
    // This routine waits for the window server to register its per-session 
    // services in our session.  This code was necessary in various pre-release 
    // versions of Mac OS X 10.5, but it is not necessary on the final version. 
    // However, I've left it in, and the option to enable it, to give me the 
    // flexibility to test this edge case.
{
    [[LogManager sharedManager] logWithFormat:@"Waiting for window server session begin"];
    
    do {
        NSDictionary *  sessionDict;
 
        sessionDict = CFBridgingRelease( CGSessionCopyCurrentDictionary() );
        if (sessionDict != nil) {
            break;
        }
        [[LogManager sharedManager] logWithFormat:@"No window server session, wait"];
        sleep(1);
    } while (YES);
 
    [[LogManager sharedManager] logWithFormat:@"Waiting for window server session end"];
}
 
static void InstallHandleSIGTERMFromRunLoop(void)
    // This routine installs a SIGTERM handler that's called on the main thread, allowing 
    // it to then call into Cocoa to quit the app.
{
    static dispatch_once_t   sOnceToken;
    static dispatch_source_t sSignalSource;
 
    dispatch_once(&sOnceToken, ^{
        signal(SIGTERM, SIG_IGN);
    
        sSignalSource = dispatch_source_create(DISPATCH_SOURCE_TYPE_SIGNAL, SIGTERM, 0, dispatch_get_main_queue());
        assert(sSignalSource != NULL);
        
        dispatch_source_set_event_handler(sSignalSource, ^{
            assert([NSThread isMainThread]);
            
            [[LogManager sharedManager] logWithFormat:@"Got SIGTERM"];
 
            [[NSApplication sharedApplication] terminate:nil];
        });
        
        dispatch_resume(sSignalSource);
    });
}
 
int main(int argc, char *argv[])
{
    int             retVal;
    NSTimeInterval  delay;
    
    [[LogManager sharedManager] logWithFormat:@"Start"];
    
    // Register the default defaults, so to speak.
    
    [[NSUserDefaults standardUserDefaults] registerDefaults:@{
        @"DelayStartup":               @0.0, 
        @"WaitForWindowServerSession": @NO,
        @"ForceOrderFront":            @YES,
        @"CleanExit":                  @YES
    }];
    
    // Handle various options startup options.
    
    if ([[NSUserDefaults standardUserDefaults] boolForKey:@"WaitForWindowServerSession"]) {
        WaitForWindowServerSession();
    } else {
        [[LogManager sharedManager] logWithFormat:@"Not waiting for CGSessionCopyCurrentDictionary"];
    }
    
    delay = [[NSUserDefaults standardUserDefaults] doubleForKey:@"DelayStartup"];
    if (delay > 0.0) {
        [[LogManager sharedManager] logWithFormat:@"Delaying %.1f", delay];
        [NSThread sleepForTimeInterval:delay];
    } else {
        [[LogManager sharedManager] logWithFormat:@"Not delaying"];
    }
    
    if ([[NSUserDefaults standardUserDefaults] boolForKey:@"CleanExit"]) {
        [[LogManager sharedManager] logWithFormat:@"Installing SIGTERM handler"];
        InstallHandleSIGTERMFromRunLoop();
    } else {
        [[LogManager sharedManager] logWithFormat:@"Not installing SIGTERM handler"];
    }
    
    // Go go gadget Cocoa!
    
    [[LogManager sharedManager] logWithFormat:@"Starting Cocoa application"];
 
    retVal = NSApplicationMain(argc, (const char **) argv);
 
    [[LogManager sharedManager] logWithFormat:@"Cocoa application returned!?"];
    
    return retVal;
}