Creating an NSRunLoop for a command line utility.

cli-nsrunloop.m

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[])
{
   NSRunLoop   * runLoop;
   CLIMain     * main; // replace with desired class

   @autoreleasepool
   {
      // create run loop
      runLoop = [NSRunLoop currentRunLoop];
      main    = [[CLIMain alloc] init]; // replace with init method

      // kick off object, if required
      [main start];

      // enter run loop
      while((!(main.shouldExit)) && (([runLoop runMode:NSDefaultRunLoopMode beforeDate:[NSDate dateWithTimeIntervalSinceNow:2]])));

   };
   return(main.exitCode);
}

Please see the following for a object-oriented approach: https://github.com/trojanfoe/RunLoopController

beautiful code !