Linux下，使用C/C++编写的一个简单的信号处理例程

// main.c file

#include <stdio.h>
#include <stdlib.h>
#include <iostream.h>

// linux header file
#include <unistd.h>
#include <sys/types.h>
#include <signal.h>

//
void MySignalAction(int nSIG)
{
 // 信号处理例程，其中dunno将会得到信号的值 SIGUSR1
 switch(nSIG)
 {
 case SIGUSR1:
  cout<<"Receiveed SIGUSR1 signal!/n"<<nSIG <<endl;
  break;

 case SIGUSR2:
  cout<<"Receiveed SIGUSR2 signal.../n" <<nSIG <<endl;
  break;

 case SIGINT:
  cout<<"Receiveed SIGINT signal.../n" <<nSIG <<endl;
  break;

 case SIGQUIT:
  cout<<"Receiveed SIGUP signal.../n" <<nSIG <<endl;
  break;

 default:
  cout<<"Receiveed unknown a signal !/n Signal ID: " <<nSIG
   <<endl ;
 }
 cout<< "Leave MySignalAction Function!/n";
}

int main()
{
 pid_t nPID = 0;
 nPID = getpid();
 cout <<"/n------------------------------------/n";
 cout <<"The process id is : " <<nPID
   <<endl <<endl;

 cout <<"------------------------------------/n";

 // test signal
 // 下面设置三个信号的处理方法
 signal(SIGUSR1, MySignalAction);
 signal(SIGUSR2, MySignalAction);
 signal(SIGINT, MySignalAction);
 signal(SIGQUIT, MySignalAction);

 for(bool bShow = true ; ; )
 {
  if(bShow)
  {
   cout<< "进入For loop。/n";
   bShow = false;
  }
  // 挂起进程
  pause();
 }
 cout<< "Process exit!/n";
 return 0;
}

// -----------------------------------------------------------------------------------

#Makefile
#

obj = main  main.o

main: main.o
 g++ -o main  main.o

main.o: main.c
 g++ -c   main.c

.PHONY: clean
clean:
 -rm $(obj)

#end file