iOS官网问答：Detecting the Debugger（判断是否处于联机调试）

这是来自苹果文档的Technical Q&A QA1361 Detecting the Debugger

Q: 我如何判断程序当前是处在联机调试？

A：最好使用以下代码来判断

#include 
#include 
#include 
#include 
#include 

static bool AmIBeingDebugged(void)
// Returns true if the current process is being debugged (either
// running under the debugger or has a debugger attached post facto).
{
    int                 junk;
    int                 mib[4];
    struct kinfo_proc   info;
    size_t              size;
    
    // Initialize the flags so that, if sysctl fails for some bizarre
    // reason, we get a predictable result.
    
    info.kp_proc.p_flag =0;
    
    // Initialize mib, which tells sysctl the info we want, in this case
    // we're looking for information about a specific process ID.
    
    mib[0] = CTL_KERN;
    mib[1] = KERN_PROC;
    mib[2] = KERN_PROC_PID;
    mib[3] = getpid();
    
    // Call sysctl.
    
    size = sizeof(info);
    junk = sysctl(mib, sizeof(mib) /sizeof(*mib), &info, &size, NULL,0);
    assert(junk == 0);
    
    // We're being debugged if the P_TRACED flag is set.
    
    return ( (info.kp_proc.p_flag &P_TRACED) != 0 );
}

PS:因为kinfo_proc结构体的定义<定义在sys/sysctl.h中>在__APPLE_API_UNSTABLE中是有条件的，所以尽量少用上述代码调试debug版