Daemon in OSX Example

Daemon in OSX Example

#import <Foundation/Foundation.h>
#import <CoreFoundation/CoreFoundation.h>

# pragma mark Daemon Protocol

@protocol DaemonProtocol
- (void)performWork;
@end

# pragma mark MyTask Object Conforms to Protocol

@interface MyTask : NSObject <DaemonProtocol>
@end;
@implementation MyTask
- (id)init
{
	self = [super init];
	if (self) {
		// Do here what you needs to be done to start things
	}
	return self;
}

- (void)dealloc
{
	// Do here what needs to be done to shut things down
	[super dealloc];
}

- (void)performWork
{
	// This method is called periodically to perform some routine work
	NSLog(@"performing work ...");
}
@end

# pragma mark Setup the daemon

// Seconds runloop runs before performing work
#define kRunLoopWaitTime 1.0

BOOL keepRunning = TRUE;

void sigHandler(int signo)
{
	NSLog(@"sigHandler: Received signale %d", signo);
	
	switch (signo) {
		case SIGTERM: keepRunning = FALSE; break; // SIGTERM means we must quit
		default: break;
	}
}

int main(int argc, char *argv[]) {
	@autoreleasepool {
		NSLog(@"Daemong running");	

		signal(SIGHUP, sigHandler);
		signal(SIGTERM, sigHandler);
	
		MyTask *task = [[MyTask alloc] init];
		while (keepRunning) {
			[task performWork];
			CFRunLoopRunInMode(kCFRunLoopDefaultMode, kRunLoopWaitTime, false);
		}
		[task release];
	
		NSLog(@"daemon existing");
	}
	return 0;
}
/*
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>KeepAlive</key><false/>
<key>Label</key><string>com.nacho4d.mydaemon</string>
<key>ProgramArguments</key><array><string>/Library/MyDaemon/Daemon/</string></array>
<key>RunAtLoad</key><true/>
<key>ServiceIPC</key><false/>
<key>StandardErrorPath</key><string>/Library/Logs/MyDaemon.log</string>
<key>StandardOutPath</key><string>/Library/Logs/MyDaemon.log</string>
</dict>
</plist>
*/