从内核向用户空间发送信号 [英] Sending signal from kernel to user space

问题描述

如何从内核空间向用户空间获取信号?

How to get signal from kernel space to user space?

推荐答案

要从内核到用户空间获取信号，请在用户空间和内核空间代码中使用以下代码，如下所示:

To get the signal from kernel to user space use the following code in your user space and kernel space code as below :

用户空间应用程序:

signal(SIGIO, &signal_handler_func); 
fcntl(fd, F_SETOWN, getpid());
oflags = fcntl(fd, F_GETFL);
fcntl(fd, F_SETFL, oflags | FASYNC);

定义 signal_handler_func 函数:

void signal_handler_func (int sig)
{

//handle the action corresponding to the signal here
}

内核空间模块:

int ret = 0;
struct siginfo info;
memset(&info, 0, sizeof(struct siginfo));
info.si_signo = SIG_TEST;
info.si_code = SI_QUEUE;
info.si_int = 1234;  

send_sig_info(SIG_TEST, &info, t);//send signal to user land 

t是用户应用程序的PID.

t is the PID of the user application.

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