macos - 守护进程知道用户何时登录 MAC

Question

我有一个守护进程（用 Obj C 编写）正在运行，我想在某些用户登录时执行一些操作。守护进程是否可以知道特定用户何时在 OSX 中登录或注销？登录时是否有任何通知？我想避免使用登录项目或启动代理。而且我还想避免在计时器上轮询以检查登录用户。

Answer 1

用于SCDynamicStoreCopyConsoleUser获取控制台用户名。

CFStringRef  consoleUserName = nil;
uid_t        uid;
gid_t        gid;
consoleUserName = SCDynamicStoreCopyConsoleUser(NULL, &uid, &gid);

存储consoleUserName在某个成员变量中。现在创建一个会话来与系统配置服务器维护的动态存储进行交互，使用SCDynamicStoreCreate

     SCDynamicStoreRef   store;
     CFStringRef         key;
     CFArrayRef          keys;
     CFRunLoopSourceRef  rls;
     store = SCDynamicStoreCreate(
                                     NULL, 
                                     CFSTR("com.apple.dts.ConsoleUser"), 
                                     callBackFunction, 
                                     NULL
                                     );

    // Set it up to notify us when the console user value changes.

    key = SCDynamicStoreKeyCreateConsoleUser(NULL);
    assert(key != NULL);

    keys = CFArrayCreate(NULL, (const void **) &key, 1, &kCFTypeArrayCallBacks);
    //assert(keys != NULL);

    success = SCDynamicStoreSetNotificationKeys(store, keys, NULL);
    //assert(success);

    // Add it to the runloop.

    rls = SCDynamicStoreCreateRunLoopSource(NULL, store, 0);
   // assert(rls != NULL);

    CFRunLoopAddSource(CFRunLoopGetCurrent(), rls, kCFRunLoopDefaultMode);


    mConsoleUserName = CopyCurrentConsoleUsername(store);
    CFRunLoopRun();

    CFRunLoopSourceInvalidate(rls);
    CFRelease(rls);
    CFRelease(keys);
    CFRelease(key);
    CFRelease(store);   

实现callBackFunction功能。当控制台用户值更改时，您将收到回调。

static void callBackFunction(
                               SCDynamicStoreRef    store,
                               CFArrayRef          changedKeys,
                               void *              info
                               )
{
    CFStringRef         currentConsoleUser;
    Boolean             didChange;

    // Get the current console user.

    currentConsoleUser = CopyCurrentConsoleUsername(store);

    if (currentConsoleUser == NULL)
    {
        return;
    }
    didChange = ! CFEqual(storedvalue, currentConsoleUser);
    if (![currentConsoleUser isEqualToString:@"loginwindow"])
    {
      // pass this value to some method
    }
}