Linux 内核态 与 用户态传递 实时信号

kernel:

#include <linux/config.h>

#include <linux/modversions.h>

#include <linux/init.h>

#include <linux/module.h>

#include <linux/kernel.h>

#include <linux/signal.h>

#include <linux/sched.h>

#define SIG_MYINT 33

#define PS_PID 30 //the user process id

static int mysig_init(void)

{

siginfo_t info;

struct task_struct *p;

info.si_signo = SIG_MYINT;

info.si_code = -1;//__SI_RT;

info.si_int = 0x8;

read_lock(&tasklist_lock);

for_each_task(p)

{

if (p->pid == PS_PID)

{

read_unlock(&tasklist_lock);

goto find_ps;

}

}

read_unlock(&tasklist_lock);

printk("can't find the process <%d>, you should run it first!
", PS_PID);

return -1;

find_ps:

printk("send signal to user space.
");

send_sig_info(SIG_MYINT, &info, p);

return 0;

}

static void mysig_exit(void)

{

printk("my signal test exit.
");

}

MODULE_LICENSE("GPL");

MODULE_AUTHOR("xxxx");

module_init(mysig_init);

module_exit(mysig_exit);

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

#define SIG_MYINT	33

void my_handler(int signo, siginfo_t *info, void *context)
{
printf("signal number: signo = %d, info->si_signo = %d
", signo,
info->si_signo);
printf("info->si_int = %d
", info->si_int);
}

int main(int argc, char **argv)
{
struct sigaction new_sa;

new_sa.sa_handler = my_handler;
sigemptyset(&new_sa.sa_mask);
new_sa.sa_flags = SA_RESTART | SA_SIGINFO;
new_sa.sa_restorer = NULL;
sigaction(SIG_MYINT, &new_sa, NULL);

while (1)
{
pause();
}
}