信号处理

• sigaction

#include <signal.h>


int sigaction(int sig, const struct sigaction *act, struct sigaction *oldact);

• 和signal比较
  • 移植性更佳　
• 常用信号

SIGINT	Ctrl-C，终止进程
SIGALRM	调用alarm和setitimer设置的定时器到期
SIGABRT	调用abort
SIGCHLD	父进程的某一子进程终止
SIGQUIT	Ctrl-\，终止进程，生成core

• struct sigaction

struct sigaction {//简化版，相关成员
    void (*sa_handler)(int);
    sigset_t sa_mask;

    int sa_flags;
    void (*sa_restorer)(void);
};

• 测试代码

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


void handler(int a)
{
        printf("This is func which process sig: %d.\n", a);
}


int main(void)
{
        struct sigaction sa;
        int a;

        bzero(&sa, sizeof(struct sigaction));
        sigemptyset(&sa.sa_mask);
        sa.sa_flags = 0;

        sa.sa_handler = handler;

        sigaction(SIGALRM, &sa, NULL);
        alarm(5);
        while (EOF != scanf("%d", &a)){
                printf("%d\n", a);
        }

        return 0;
}