追赶自己的处理程序内部信号 [英] Catching signal inside its own handler

问题描述

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

void handler(int signo)
{
    printf("Into handler\n");
    while(1);
}
int main()
{
    struct sigaction act;
    act.sa_handler = handler;
    act.sa_flags = 0;
    sigemptyset(& act.sa_mask);
    sigaction(SIGINT, &act, NULL);
    while(1);
    return 0;
}

捕后的 KeyboardInterrupt 一次，当我再次preSSCTRL + C，SIGINT不处理...
我意愿的进入处理程序应每我的时间打印preSSCTRL + C

After catching the KeyboardInterrupt once, when I press "Ctrl+C" again, SIGINT is not handled... I intend that "Into handler" should be printed each time I press "Ctrl+C".

我要赶在里面SIGINTSIGINT处理程序（）本身..

推荐答案

您需要设置SA_NODEFER上sa_mask赶上相同的信号作为一个你当前正在处理：

You need to set SA_NODEFER on sa_mask to catch the same signal as the one you're currently handling:

SA_NODEFER：从自己的信号处理程序中接收不要prevent信号。 SA_NOMASK是这个标志一个过时的，不规范的代名词。

SA_NODEFER: Do not prevent the signal from being received from within its own signal handler. SA_NOMASK is an obsolete, non-standard synonym for this flag.

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