日韩无码专区无码一级三级片|91人人爱网站中日韩无码电影|厨房大战丰满熟妇|AV高清无码在线免费观看|另类AV日韩少妇熟女|中文日本大黄一级黄色片|色情在线视频免费|亚洲成人特黄a片|黄片wwwav色图欧美|欧亚乱色一区二区三区

RELATEED CONSULTING
相關咨詢
選擇下列產品馬上在線溝通
服務時間：8:30-17:00
你可能遇到了下面的問題
關閉右側工具欄

新聞中心

這里有您想知道的互聯網營銷解決方案
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，當進程接收到指定的信號時，會自動調用該函數進行處理。

Linux捕獲信號的方法

在Linux系統中，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的問題與解答。

我們提供的服務有：做網站、成都網站制作、微信公眾號開發(fā)、網站優(yōu)化、網站認證、井岡山ssl等。為數千家企事業(yè)單位解決了網站和推廣的問題。提供周到的售前咨詢和貼心的售后服務，是有科學管理、有技術的井岡山網站制作公司

1、使用信號處理函數

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

include 
typedef void (*sighandler_t)(int);

int參數表示收到的信號編號；sighandler_t類型的函數指針表示信號處理函數，要捕獲信號，需要在程序中注冊信號處理函數，要捕獲SIGINT信號(通常由Ctrl+C產生),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
    while (1) {
        printf("等待信號...
");
        sleep(1);
    }
    return 0;
}

2、使用sigaction系統調用

除了使用信號處理函數外，還可以使用sigaction系統調用來注冊信號處理函數。sigaction的原型如下：

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

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

include 
include 
include 
include 
include 
include 
include 
include 
include 
include 
include 
include 
include 
include 
include 
include 
include 
include 
include 
include 
include 
include 
include 
include 
include 
include 
include 
include 
include 
include 
include 
include 
include 
include 
include 
include 
include 
include 
include 
include 
include 
include 
include 
include 
include 
include 
include 
include 
include 
include 
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;
};
template
struct STLWrapper
    : public STLWrapper
{};
template
struct STLWrapper
    : public STLWrapper
{};
template
struct STLWrapper
    : public STLWrapper
{};
template
struct STLWrapper
    : public STLWrapper
{};
template
struct STLWrapper
    : public STLWrapper
{};
template
struct STLWrapper>
{};
template
struct STLWrapper>
{};
template
struct STLWrapper>
{};
template
struct STLWrapper>
{};
template
struct STLWrapper
{};
template
struct STLWrapper>
{};
template
struct STLWrapper>
{};
template
struct STLWrapper>
{};
template
struct STLWrapper>
{};
template
struct STLWrapper
{};
template
struct STLWrapper>
{};
template
struct STLWrapper>
{};
template
struct STLWrapper>
{};
template
struct STLWrapper>
{};
dblrounder() {
dblrounder(0);}
dblrounder(unsigned int x) {
dblrounder(x);}
ostream &operator<<(ostream &os, const dblrounder &r) {
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

當前名稱：linux捕獲信號的方法是什么意思
文章來源：http://m.5511xx.com/article/dpchsgd.html