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linux捕獲信號的方法是什么意思
Linux捕獲信號的方法是指在進程中注冊一個信號處理函數(shù)，當進程接收到指定的信號時，會自動調(diào)用該函數(shù)進行處理。

Linux捕獲信號的方法

在Linux系統(tǒng)中，信號是一種用于通知進程發(fā)生了某個事件的機制，信號可以由內(nèi)核發(fā)送給進程，也可以由進程之間發(fā)送，捕獲信號是進程對外部事件的一種響應方式，通過捕獲信號，進程可以在收到信號時執(zhí)行特定的操作，本文將介紹Linux中捕獲信號的方法以及相關(guān)的問題與解答。

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1、使用信號處理函數(shù)

Linux系統(tǒng)中，每個進程都可以定義一個信號處理函數(shù)(signal handler),用于處理收到的信號，當進程收到信號時，會自動調(diào)用該信號處理函數(shù)，信號處理函數(shù)的原型如下：

include 
typedef void (*sighandler_t)(int);

int參數(shù)表示收到的信號編號；sighandler_t類型的函數(shù)指針表示信號處理函數(shù)，要捕獲信號，需要在程序中注冊信號處理函數(shù)，要捕獲SIGINT信號(通常由Ctrl+C產(chǎn)生),可以使用以下代碼：

include 
include 
include 
void signal_handler(int signum) {
    printf("接收到信號 %d
", signum);
}
int main() {
    signal(SIGINT, signal_handler); // 注冊信號處理函數(shù)
    while (1) {
        printf("等待信號...
");
        sleep(1);
    }
    return 0;
}

2、使用sigaction系統(tǒng)調(diào)用

除了使用信號處理函數(shù)外，還可以使用sigaction系統(tǒng)調(diào)用來注冊信號處理函數(shù)。sigaction的原型如下：

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

signum參數(shù)表示要捕獲的信號編號；act指向一個sigaction結(jié)構(gòu)體，用于指定信號處理函數(shù)和附加選項；oldact用于保存原來的信號處理函數(shù)(如果有的話)，下面是一個使用sigaction的例子：

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define FOREACH(i, m) for (auto i = (m).begin(); i != (m).end(); ++i) 
template
struct STLWrapper{
    typedef T value_type;
    typedef std::array array_type;
    typedef std::vector> vector_type;
    typedef std::list> list_type;
    typedef std::deque> deque_type;
    typedef std::forward_list> forward_list_type;
};
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{};
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dblrounder() {
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dblrounder(unsigned int x) {
dblrounder(x);}
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sprintf(buffer, "%g", r.value); os << buffer;
osflush(buffer); return os;}
dblrounder& operator+=(dblrounder &a) {
a.value += a.value >= 0.5 ? 0.5 : -0.5;return a;
ostream &operator+=(ostream &os, const dblrounder &a) {return os << a;}
dblrounder& operator-=(dblrounder &a) {
a.value -= a.value >= 0.5 ? 0.5 : -0.5;return a;
ostream &operator-=(ostream &os, const dblrounder &a) {return os << a;}
dblrounder& operator*=(dblrounder &a) {
a.value *= a.value >= 1 ? 10000000000000000032765463127458959121053859791337890625 : 0.0000000000000000032765463127458959121053859791337890625;return a;
ostream &operator*=(ostream &os, const dblrounder &a) {return os << a;}
dblrounder& operator/=(d

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