对多个信号具有单个信号处理程序功能的正确方法是什么? [英] What is correct way to have single Signal Handler function for multiple Signals?

问题描述

在Linux上的C语言中，最好的方法是设置一个程序来处理具有相同功能的多个POSIX信号?

What is the best way in C on Linux for setting up a program that can handle multiple POSIX-signals with the same function?

例如，在我的代码中，我有一个处理函数，当捕获到信号以执行某些操作时，我想一般调用该处理函数:

For example in my code I have a handler function that I want to generically call when ever a signal is caught to perform some actions:

/* Exit handler function called by sigaction */
void exitHandler( int sig, siginfo_t *siginfo, void *ignore )
{
  printf("*** Got %d signal from %d\n", siginfo->si_signo, siginfo->si_pid);
  loopCounter=0;

  return;
}

我通过为每个信号进行单独的信号调用来设置两个信号来捕获:

I have set up two signals to catch by having individual sigaction calls for each signal:

/* Set exit handler function for SIGUSR1 , SIGINT (ctrl+c) */
struct sigaction act;
act.sa_flags = SA_SIGINFO;
act.sa_sigaction = exitHandler;
sigaction( SIGUSR1, &act, 0 );
sigaction( SIGINT, &act, 0 );

这是设置此类处理的正确方法吗?还有什么其他方法可以让我不必枚举所有可能的信号编号吗?

Is this the correct way to set up this type of handling? Is there any other way where I don't have to enumerate all the possible signal numbers?

推荐答案

我看不到如何直接为 all 信号设置单个处理程序.但是，您可以使用 sigfillset() 生成一个包含所有有效信号编号的集合，然后使用

I can't see how you can straightforwardly set a single handler for all signals. However, you can get fairly close by using sigfillset() to generate a set containing all valid signal numbers, and then iterate over possible signal numbers using sigismember() to determine whether that number is in the set, and set a handler if so. OK, I can't see a method of determining what the maximum possible signal number is, so you might have to guess a suitable maximum value.

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