signal

目前没找到怎么实现，进程处于系统调用态时ignore某信号，处于用户态模式响应该信号

ps -ef | grep a.out | grep -v grep | awk '{print $2}' | xargs -I % kill -urg %

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


static void hdl (int sig, siginfo_t *siginfo, void* context)
{
    printf("recv hdl\n");
}
int main()
{
    struct sigaction act;
    memset (&act, '\0', sizeof(act));
    act.sa_sigaction = &hdl;
    // act.sa_flags = SA_ONSTACK | SA_SIGINFO |SA_RESTART;
    act.sa_flags = SA_RESTART;
    signal (SIGURG, SIG_IGN);
    if (sigaction(SIGURG, &act, NULL) < 0) {
        printf("sigaction err");
        return 1;
    }

    sleep(600);
    return 0;
}

#include <time.h>
#include <stdio.h>
#include <string.h>
#include <signal.h>
#include <unistd.h>

static void hdl (int sig, siginfo_t *siginfo, void* context)
{
    printf("recv hdl\n");
}

int main()
{
    struct sigaction act;
    memset (&act, '\0', sizeof(act));
    act.sa_sigaction = &hdl;
    act.sa_flags = SA_ONSTACK | SA_SIGINFO ;
    if (sigaction(SIGUSR1, &act, NULL) < 0) {
        printf("sigaction err");
        return 1;
    }

    struct sigevent event;
    timer_t timer_id;

    event.sigev_value.sival_ptr = &timer_id;
    event.sigev_notify = SIGEV_SIGNAL;
    event.sigev_signo = SIGUSR1;
    timer_create(CLOCK_REALTIME, &event, &timer_id);
    struct itimerspec ts;
    ts.it_interval.tv_sec = 0; // the spacing time
    ts.it_interval.tv_nsec = 50000000;
    ts.it_value.tv_sec = 0;  // the delay time start
    ts.it_value.tv_nsec = 10000000;
    int ret = timer_settime(timer_id, 0, &ts, NULL);
    if (ret)
        printf("set time err:%d",ret);

    printf("cmd1\n");
    sleep(60);
    printf("cmd2\n");
    getchar();
    printf("cmd3\n");
    return 0;
}