检查是否连接到调试器

/**
 * Check if the debugger is attached
 *
 * Taken from https://github.com/plausiblelabs/plcrashreporter/blob/2dd862ce049e6f43feb355308dfc710f3af54c4d/Source/Crash%20Demo/main.m#L96
 *
 * @return `YES` if the debugger is attached to the current process, `NO` otherwise
 */
+ (BOOL)isDebuggerAttached
{
    static BOOL debuggerIsAttached = NO;
    static dispatch_once_t debuggerPredicate;
    dispatch_once(&debuggerPredicate, ^{
        struct kinfo_proc info;
        size_t info_size = sizeof(info);
        int name[4];
        name[0] = CTL_KERN;
        name[1] = KERN_PROC;
        name[2] = KERN_PROC_PID;
        name[3] = getpid();
        if (sysctl(name, 4, &info, &info_size, NULL, 0) == -1) {
            NSLog(@"[HockeySDK] ERROR: Checking for a running debugger via sysctl() failed: %s", strerror(errno));
            debuggerIsAttached = false;
        }
        if (!debuggerIsAttached && (info.kp_proc.p_flag & P_TRACED) != 0)
            debuggerIsAttached = true;
    });

    return debuggerIsAttached;
}