C Sleep and File Writing

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I'm having some issues with writing to a file whilst also having a delay in a while loop. Here's a snippet:

void main(int){
   FILE * fp = NULL;
   sprintf(filename, "log%i.msg", SET_ID);
   fp = fopen(filename, "w+");

   fprintf(fp, "File started\n");
   while(1){
      fprintf(fp, "%i %u %s\n", someInt, someUnsigned, someString);
      fflush(stdout);

      sleep(5); // Commenting out this line will work
   }
   fclose(fp);
   return 1;
}

Running the code gives me an output file of 0 bytes with nothing in it. However, when I remove the sleep(5); line, it does print correctly. I've searched about this already, but what I've found is that it needs to be flushed, but I do this (though apparantly incorrectly). What am I doing wrong?

asked 41 secs ago

arbitter

913