How do I detect that an iOS app is running on a jailbroken phone?

Question

If I want my app to behave differently on a jailbroken iPhone, how would I go about determining this?

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);
        return NO;
    }
    else {
        // device IS jailbroken
        fclose(f);
        return YES;
    }
#endif
}