LINUX 进程间 信号

#include <iostream>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <signal.h>
using namespace std;
extern char **environ;
void signal_handle(int signal_no){
cout << "sign:" <<signal_no << endl;
}
int main(int args,char *argc[]){

pid_t pid=fork();
if(pid<0){
cout << "fork error!" <<endl;
}else if(pid==0){

signal(SIGUSR1,signal_handle_kill);
int count=0;
while(count<10){
count++;
cout << "count:" <<count <<endl;
sleep(1);
}
kill(getppid(),SIGUSR1);
}else{
signal(SIGUSR1,signal_handle);
pause();
}

}