在Linux中通过信号发送信息 [英] Sending information with a Signal in Linux

问题描述

当从一个进程向另一个进程发送信号时，我还想发送一个 long 类型的值.那可能吗?我正在使用SIGUSR1.

When sending a signal from one process to another, I also want to send a value of type long. Is that possible? I am using SIGUSR1.

推荐答案

可以，但是您必须使用

Sure you can, but you'll have to send it with sigqueue(2) instead of kill(2). And you can send an int or a sival_ptr.

union sigval {
    int   sival_int;
    void *sival_ptr;
};

建立处理程序

struct sigaction sa;
sigemptyset(&sa.sa_mask);
sa.sa_sigaction = handler;
sa.sa_flags = SA_SIGINFO; /* Important. */

sigaction(SIGUSR1, &sa, NULL);

使用SA_SIGINFO建立的信号处理程序

static void
handler(int sig, siginfo_t *si, void *ucontext)
{
    si->si_value; /* This is what you're looking for. */
}

发送整数

union sigval sv;
sv.sival_int = 42;

sigqueue(pid, SIGUSR1, sv);

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