check app is responding on Mac

main.mm

//
//  main.c
//  AppStatusChecker
//
//  Created by Jonny Yu on 1/23/14.
//  Copyright (c) 2014 Jonny Yu. All rights reserved.
//

#include <CoreServices/CoreServices.h>
#include <ApplicationServices/ApplicationServices.h>

int main(int argc, const char * argv[])
{
    pid_t pid = 56377;
    
    OSStatus status = WaitForApplicationUIReady(56377, 5);
    if (status == noErr) {
        printf("UI Ready for Input\n");
    }
    else {
        printf("UI not ready within time limit.\n");
    }
    
    return 0;
}

OSStatus WaitForApplicationUIReady(pid_t pid, long timeoutInSeconds)
{
    ProcessSerialNumber psn;
    
    OSStatus status = GetProcessForPID(pid, &psn);
    if (status != noErr)
        return status;
    
    status = SendAppleEventToPSN(&psn, kAENullEvent, timeoutInSeconds * 60);
    return status;
}


OSStatus SendAppleEventToPSN(ProcessSerialNumber * psn, AEEventID eventToSendID, long timeoutInTicks) {
    AEAddressDesc targetDesc;
    
    AppleEvent eventReply = {typeNull, NULL};
    AppleEvent eventToSend = {typeNull, NULL};
    
    OSStatus status = AECreateDesc(typeProcessSerialNumber,
                                   psn, sizeof(ProcessSerialNumber), &targetDesc);
    
    if (status != noErr)
        return status;
    
    status = AECreateAppleEvent(kCoreEventClass, eventToSendID,
                                &targetDesc, kAutoGenerateReturnID, kAnyTransactionID, &eventToSend);
    
    AEDisposeDesc(&targetDesc);
    
    if (status != noErr)
        return status;
    
    status = AESendMessage(&eventToSend, &eventReply, kAEWaitReply, timeoutInTicks);
    
    AEDisposeDesc(&eventToSend);
    AEDisposeDesc(&eventReply);
    return status;
}