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linux捕获信号的方法是什么意思

Linux捕获信号的方法是指在进程中注册一个信号处理函数，当进程接收到指定的信号时，会自动调用该函数进行处理。

Linux捕获信号的方法

在Linux系统中，信号是一种用于通知进程发生了某个事件的机制，信号可以由内核发送给进程，也可以由进程之间发送，捕获信号是进程对外部事件的一种响应方式，通过捕获信号，进程可以在收到信号时执行特定的操作，本文将介绍Linux中捕获信号的方法以及相关的问题与解答。

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1、使用信号处理函数

Linux系统中，每个进程都可以定义一个信号处理函数(signal handler),用于处理收到的信号，当进程收到信号时，会自动调用该信号处理函数，信号处理函数的原型如下：

include 
typedef void (*sighandler_t)(int);

int参数表示收到的信号编号；sighandler_t类型的函数指针表示信号处理函数，要捕获信号，需要在程序中注册信号处理函数，要捕获SIGINT信号(通常由Ctrl+C产生),可以使用以下代码：

include 
include 
include 
void signal_handler(int signum) {
    printf("接收到信号 %d
", signum);
}
int main() {
    signal(SIGINT, signal_handler); // 注册信号处理函数
    while (1) {
        printf("等待信号...
");
        sleep(1);
    }
    return 0;
}

2、使用sigaction系统调用

除了使用信号处理函数外，还可以使用sigaction系统调用来注册信号处理函数。sigaction的原型如下：

include 
int sigaction(int signum, const struct sigaction *act, struct sigaction *oldact);

signum参数表示要捕获的信号编号；act指向一个sigaction结构体，用于指定信号处理函数和附加选项；oldact用于保存原来的信号处理函数(如果有的话)，下面是一个使用sigaction的例子：

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