ios - 使用 SIGPIPE 和 SIG_IGN 的信号函数

Question

我加入了一个旧项目，我发现了这一行

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    signal(SIGPIPE, SIG_IGN);
    ....
}

我在文档中找到了这个:

/*
 * For historical reasons; programs expect signal's return value to be
 * defined by <sys/signal.h>.
 */

但我仍然对该行的目的感到困惑。

Answer 1

From Apple's documentation :

When a connection closes, by default, your process receives a SIGPIPE signal. If your program does not handle or ignore this signal, your program will quit immediately.

Ignore the signal globally with the following line of code:signal(SIGPIPE, SIG_IGN);