检测是否正在从Xcode运行Swift应用程序 [英] Detect if Swift app is being run from Xcode

问题描述

我想以编程方式确定iOS应用程序是直接从XCode运行（在模拟器中还是在系留设备上）。
我已经尝试了这里描述的-D DEBUG解决方案，但是当我从Xcode断开连接并重新连接时运行应用程序，它仍然认为它处于调试模式。
我认为我正在寻找的是一个Swift版本的此功能

I would like to programmatically determine if the iOS app is being run directly from XCode (either in the simulator or on a tethered device). I've tried the -D DEBUG solution described here, but when I then disconnect from Xcode and re-run the app, it still thinks it's in debug mode. I think what I'm looking for is a Swift version of this function

#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 );
}

推荐答案

澄清：您的C代码（以及下面的Swift版本）检查程序是否在调试器控件下运行
，，如果它是从
Xcode运行的话。可以调试Xcode之外的程序（通过直接调用lldb或
gdb），可以从Xcode运行程序而不调试它
（如果方案设置中的Debug Executable复选框关闭） 。

Clarification: Your C code (and the Swift version below) checks if the program is run under debugger control, not if it's being run from Xcode. One can debug a program outside of Xcode (by calling lldb or gdb directly) and one can run a program from Xcode without debugging it (if the "Debug Executable" checkbox in the scheme setting is off).

您可以简单地保留C函数并从Swift中调用它。
如何从中调用Objective-C代码中给出的配方Swift 也适用于纯C代码。

You could simply keep the C function and call it from Swift. The recipes given in How to call Objective-C code from Swift apply to pure C code as well.

但将代码转换为Swift实际上并不太复杂：

But it is actually not too complicated to translate that code to Swift:

func amIBeingDebugged() -> Bool {

    var info = kinfo_proc()
    var mib : [Int32] = [CTL_KERN, KERN_PROC, KERN_PROC_PID, getpid()]
    var size = strideofValue(info)
    let junk = sysctl(&mib, UInt32(mib.count), &info, &size, nil, 0)
    assert(junk == 0, "sysctl failed")
    return (info.kp_proc.p_flag & P_TRACED) != 0
}

备注：

• kinfo_proc（）创建完全初始化所有
  字段的结构设置为零，因此无需设置 info.kp_proc.p_flag = 0 。


• C int 类型是 Int32 是Swift。


• sizeof（info）来自C代码必须 strideOfValue（info）
包含结构填充。使用 sizeofValue（info）
上述代码在64位设备的模拟器中始终返回false。这是最困难的部分。



• kinfo_proc() creates a fully initialized structure with all fields set to zero, therefore setting info.kp_proc.p_flag = 0 is not necessary.
• The C int type is Int32 is Swift.
• sizeof(info) from the C code has to be strideOfValue(info) in Swift to include the structure padding. With sizeofValue(info) the above code always returned false in the Simulator for 64-bit devices. This was the most difficult part to figure out.

Swift 3更新（Xcode 8）：

strideofValue 且相关功能不再存在，
它们已由<$ c $替换c> MemoryLayout ：

strideofValue and the related functions do not exist anymore, they have been replaced by MemoryLayout:

func amIBeingDebugged() -> Bool {

    var info = kinfo_proc()
    var mib : [Int32] = [CTL_KERN, KERN_PROC, KERN_PROC_PID, getpid()]
    var size = MemoryLayout<kinfo_proc>.stride
    let junk = sysctl(&mib, UInt32(mib.count), &info, &size, nil, 0)
    assert(junk == 0, "sysctl failed")
    return (info.kp_proc.p_flag & P_TRACED) != 0
}

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