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(guān)咨詢
選擇下列產(chǎn)品馬上在線溝通
服務(wù)時(shí)間：8:30-17:00
你可能遇到了下面的問(wèn)題
關(guān)閉右側(cè)工具欄

新聞中心

這里有您想知道的互聯(lián)網(wǎng)營(yíng)銷解決方案
linux捕獲信號(hào)的方法是什么意思
Linux捕獲信號(hào)的方法是指在進(jìn)程中注冊(cè)一個(gè)信號(hào)處理函數(shù)，當(dāng)進(jìn)程接收到指定的信號(hào)時(shí)，會(huì)自動(dòng)調(diào)用該函數(shù)進(jìn)行處理。

Linux捕獲信號(hào)的方法

在Linux系統(tǒng)中，信號(hào)是一種用于通知進(jìn)程發(fā)生了某個(gè)事件的機(jī)制，信號(hào)可以由內(nèi)核發(fā)送給進(jìn)程，也可以由進(jìn)程之間發(fā)送，捕獲信號(hào)是進(jìn)程對(duì)外部事件的一種響應(yīng)方式，通過(guò)捕獲信號(hào)，進(jìn)程可以在收到信號(hào)時(shí)執(zhí)行特定的操作，本文將介紹Linux中捕獲信號(hào)的方法以及相關(guān)的問(wèn)題與解答。

我們提供的服務(wù)有：做網(wǎng)站、成都網(wǎng)站制作、微信公眾號(hào)開(kāi)發(fā)、網(wǎng)站優(yōu)化、網(wǎng)站認(rèn)證、井岡山ssl等。為數(shù)千家企事業(yè)單位解決了網(wǎng)站和推廣的問(wèn)題。提供周到的售前咨詢和貼心的售后服務(wù)，是有科學(xué)管理、有技術(shù)的井岡山網(wǎng)站制作公司

1、使用信號(hào)處理函數(shù)

Linux系統(tǒng)中，每個(gè)進(jìn)程都可以定義一個(gè)信號(hào)處理函數(shù)(signal handler),用于處理收到的信號(hào)，當(dāng)進(jìn)程收到信號(hào)時(shí)，會(huì)自動(dòng)調(diào)用該信號(hào)處理函數(shù)，信號(hào)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(hào)編號(hào)；sighandler_t類型的函數(shù)指針表示信號(hào)處理函數(shù)，要捕獲信號(hào)，需要在程序中注冊(cè)信號(hào)處理函數(shù)，要捕獲SIGINT信號(hào)(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(hào) %d
", signum);
}
int main() {
    signal(SIGINT, signal_handler); // 注冊(cè)信號(hào)處理函數(shù)
    while (1) {
        printf("等待信號(hào)...
");
        sleep(1);
    }
    return 0;
}

2、使用sigaction系統(tǒng)調(diào)用

除了使用信號(hào)處理函數(shù)外，還可以使用sigaction系統(tǒng)調(diào)用來(lái)注冊(cè)信號(hào)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(hào)編號(hào)；act指向一個(gè)sigaction結(jié)構(gòu)體，用于指定信號(hào)處理函數(shù)和附加選項(xiàng)；oldact用于保存原來(lái)的信號(hào)處理函數(shù)(如果有的話)，下面是一個(gè)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

文章名稱：linux捕獲信號(hào)的方法是什么意思
URL地址：http://m.5511xx.com/article/dpchsgd.html