进程之间信号收发并携带数据

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

int main(int argc, char ** argv)
{
    union sigval    value;
    int        signum = SIGTERM;    // 默认发送SIGTERM
    pid_t        pid;
    int        i;

    /*初始化*/
    value.sival_int = 0;    

    /*检查参数的个数*/
    if (argc != 3 && argc != 5 && argc != 7) {
        printf("./send_data_signo <-d data> <-s signum> [-p][data]\n");
        exit(1);
    }

    /*从命令行参数解析出信号编号、PID以及待传递的数据*/
    for (i=1; i<argc; i++) {
        if (!strcmp(argv[i], "-d")) {
            value.sival_int = atoi(argv[i+1]);
            continue;
        }
        if (!strcmp(argv[i], "-s")) {
            signum = atoi(argv[i+1]);
            continue;
        }
        if (!strcmp(argv[i], "-p")) {
            pid = atoi(argv[i+1]);
            continue;
        }
    }

    /*利用sigqueue给pid发送信号signum，并携带数据value*/
    if (sigqueue(pid, signum, value) < 0) {
        perror("sigqueue");
        exit(1);
    }

    return 0;
}

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

/*三参数的信号处理程序*/
void handler_sigint(int signo, siginfo_t *siginfo, void * pvoid)
{
    printf("recv SIGINT, the data value is:%d\n", siginfo->si_int);
}

int main()
{
    struct sigaction act;
    
    /*赋值act结构*/
    act.sa_sigaction = handler_sigint;
    act.sa_flags = SA_SIGINFO;        // 指定使用三参数的信号处理函数
    /*安装信号处理函数*/
    sigaction(SIGINT, &act, NULL);
    
    while(1)
        ;

    return 0;
}