陷入 sigwait 困境

发布于 2024-11-06 10:39:45 字数 670 浏览 0 评论 0原文

我在代码中做错了，其他进程向它发送了 SIGUSR2 信号：

sigset_t sigset;
sigemptyset(&sigset);
sigaddset(&sigset, SIGILL);
sigaddset(&sigset, SIGUSR2);
sigwait(&sigset, &received);

XCode 注意到收到了 SIGUSER2(31) 信号，但收到的 = SIGILL(4) （或集合中的最小信号）。

为什么会这样呢？我哪里错了？

现在，它看起来像这样：

    sigset_t sigset;
    sigemptyset(&sigset);
    sigaddset(&sigset, SIGILL);
    sigaddset(&sigset, SIGUSR2);
    sigprocmask(SIG_BLOCK, &sigset, 0);
    sigwait(&sigset, &received);
    if(received == SIGUSR2) {
        //...
    } else if(received == SIGILL) {
        //...
    }

仍然不起作用。

原文

I did something wrong in my code, where an other process send a SIGUSR2 signal to it:

sigset_t sigset;
sigemptyset(&sigset);
sigaddset(&sigset, SIGILL);
sigaddset(&sigset, SIGUSR2);
sigwait(&sigset, &received);

XCode notices SIGUSER2(31) signal received, but received = SIGILL(4) (or the minimal signal in the set).

Why is that so? Where I am wrong?

Now, it looks like this:

    sigset_t sigset;
    sigemptyset(&sigset);
    sigaddset(&sigset, SIGILL);
    sigaddset(&sigset, SIGUSR2);
    sigprocmask(SIG_BLOCK, &sigset, 0);
    sigwait(&sigset, &received);
    if(received == SIGUSR2) {
        //...
    } else if(received == SIGILL) {
        //...
    }

Still not working.

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无人问我粥可暖 2024-11-13 10:39:45

有时调试器可能会妨碍。我以前见过调试器干扰信号处理。尝试在不涉及调试器的情况下运行代码。

以下代码在 OS X 上完美运行：

#include <signal.h>
#include <stdio.h>

int main()
{
    sigset_t set;
    int sig;

    sigemptyset(&set);
    sigaddset(&set, SIGUSR1);
    sigaddset(&set, SIGUSR2);
    sigprocmask(SIG_BLOCK, &set, NULL);
    sigwait(&set, &sig);
    printf("Got signal %d\n", sig);
    return 0;
}

Sometimes the debugger can get in the way. I have seen debuggers interfere with signal handling before. Try running the code without the debugger involved.

The following code works perfectly on OS X:

#include <signal.h>
#include <stdio.h>

int main()
{
    sigset_t set;
    int sig;

    sigemptyset(&set);
    sigaddset(&set, SIGUSR1);
    sigaddset(&set, SIGUSR2);
    sigprocmask(SIG_BLOCK, &set, NULL);
    sigwait(&set, &sig);
    printf("Got signal %d\n", sig);
    return 0;
}

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