iphone - 检测 iOS 应用程序是否在调试器中运行

Question

我将我的应用程序设置为将调试输出发送到控制台或日志文件。现在，我想在代码中决定是否

• 它在调试器(或模拟器)中运行，因此有一个控制台窗口，我想直接在其中读取输出，或者如果
• 没有控制台窗口，因此应将输出重定向到文件。

有没有办法确定应用程序是否在调试器中运行？

Answer 1

技术问答 1361(entry in Mac library 和 entry in iOS library ；它们是相同的)中有一个来自 Apple 的功能来检测程序是否正在被调试。

技术问答中的代码:

#include <assert.h>
#include <stdbool.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/sysctl.h>

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 );
}

还要注意问答末尾的这个注释:

Important: Because the definition of the kinfo_proc structure (in <sys/sysctl.h>) is conditionalized by __APPLE_API_UNSTABLE, you should restrict use of the above code to the debug build of your program.