Detecting if iOS app is run in debugger

Question

I set up my application to either send debugging output to console or a log file. Now, I\'d like to decide with in the code whether

• it is run in the debugger

Answer 1

Based off an answer in a duplicate thread that was for Objective-C as well and showed how HockeyApp-iOS does it, here's a Swift 5 version:

let isDebuggerAttached: Bool = {
    var debuggerIsAttached = false

    var name: [Int32] = [CTL_KERN, KERN_PROC, KERN_PROC_PID, getpid()]
    var info: kinfo_proc = kinfo_proc()
    var info_size = MemoryLayout.size

    let success = name.withUnsafeMutableBytes { (nameBytePtr: UnsafeMutableRawBufferPointer) -> Bool in
        guard let nameBytesBlindMemory = nameBytePtr.bindMemory(to: Int32.self).baseAddress else { return false }
        return -1 != sysctl(nameBytesBlindMemory, 4, &info/*UnsafeMutableRawPointer!*/, &info_size/*UnsafeMutablePointer!*/, nil, 0)
    }

    // The original HockeyApp code checks for this; you could just as well remove these lines:
    if !success {
        debuggerIsAttached = false
    }

    if !debuggerIsAttached && (info.kp_proc.p_flag & P_TRACED) != 0 {
        debuggerIsAttached = true
    }

    return debuggerIsAttached
}()