c+ signal

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#include <iostream> #include <string> using namespace std;    typedef uint32_t u32; typedef uint8_t u8; typedef uint16_t u16;    #include <signal.h> int deamon_run = 1;  /*进程关闭信号处理*/ static void sig_handler(const int sig) {     int ret;     if (sig != SIGTERM && sig != SIGQUIT && sig != SIGINT)         return;       if (deamon_run != 0)         deamon_run = 0;       printf("signal(%d) received, try to exit deamon gracefully ..\n", sig); }   int main() {     /*进程退出信号监视*/     if (signal(SIGTERM, sig_handler) == SIG_ERR)         cout<<"can not catch SIGTERM"<<endl;     if (signal(SIGQUIT, sig_handler) == SIG_ERR)         cout<<"can not catch SIGQUIT"<<endl;     if (signal(SIGINT, sig_handler) == SIG_ERR)         cout<<"can not catch SIGINT"<<endl;      // while (deamon_run){    // }       return 0; }