[완료]SIGCHLD 처리를 어디서 어떻게 해야 하는지요?

int main(int argc, char *argv[])
{       
    pid_t pid;
    const char *exe_argv1[] = {
        "/root/work/test/tmp/p2", "/root/work/test/tmp/p3"
    };
    const char *exe_argv2[] = { "p2", "p3" };
    char argv_tmp1[128]={0}, argv_tmp2[64]={0};
    int i;
 
    for (i = 0; i < 2; i++) {
        pid = fork();
        if (pid == 0) {
            sprintf(argv_tmp1, "%s", exe_argv1[i]);
            sprintf(argv_tmp2, "%s", exe_argv2[i]);
            execl(argv_tmp1, argv_tmp2, 0);
            exit(0);
        }
        else if (pid < 0) {
            printf("fork failded.\n");
            exit(1);
        }
    }
 
    while (1) {
        printf("%s: pid=[%d]\n", __FILE__, getpid());
        sleep(2);
    }
 
    return 0;
}

int main(int argc, char *argv[])
{
    while (1) {
        printf("%s: pid=[%d]\n", __FILE__, getpid());
        sleep(2);
    }
 
    return 0;
}

int main(int argc, char *argv[])
{
    while (1) {
        printf("%s: pid=[%d]\n", __FILE__, getpid());
        sleep(2);
    }
 
    return 0;
}