dreadpiratepj

- (void)applicationDidFinishLaunching:(UIApplication *)app {
    if ([UIDevice currentDevice].multitaskingSupported) {
        UIBackgroundTaskIdentifier *backgroundTask = 
        [app beginBackgroundTaskWithExpirationHandler:^{
            /* just fail if this happens. */
            NSLog(@"BackgroundTask Expiration Handler is called");
            [app endBackgroundTask:backgroundTask];
        }];
    }
}

dreadpiratepj

void *nmapFile(int sizeInBytes, FILE *myFile) {
     if (myFile) {
          /* Get the file descriptor from the FILE pointer. */
          int fd = fileno(myFile);
          if (fd >= 0) {
                /* Map the file into an unused area of the process's address space. */
                void *result = mmap(
                     NULL,                    /* No preferred address. */
                     sizeInBytes,             /* Size of mapped space. */
                     PROT_READ,               /* Read access. */

dreadpiratepj

void *newScratchArea(int sizeInBytes) {
     /*
          Create a temporary file. This file will be automatically
          destroyed by the system when our process exits.
     */
     FILE *f = tmpfile();
     if (f) {
          /* Get the file descriptor from the FILE pointer. */
          int fd = fileno(f);
          if (fd >= 0) {