How to detect that the app is running on a jailbroken device? [duplicate]

Answer 1

-(BOOL) isJailbroken
{
#if TARGET_IPHONE_SIMULATOR
return NO;
#else
FILE *f = fopen("/bin/bash", "r");
if (errno == ENOENT)
{
    // device is NOT jailbroken
    fclose(f);
    NSLog(@"no");
    return NO;
}
else {
    // device IS jailbroken
    fclose(f);
    NSLog(@"yes");
    return YES;

}
#endif
}