C++通过fork创建子进程实战

一 代码

#include <iostream>
using namespace std;

#include <unistd.h>  
#include <stdio.h>   
int main()   
{   
    pid_t fpid;  
    int count = 0;  
    fpid = fork();   //返回子进程的进程ID
    if (fpid < 0)     //如果返回负数，则出错了
        cout<<"failed to fork";   
    else if (fpid == 0)  //如果fork返回0，则下面进入子程序 
    {  
        cout<<"I am the child process, my pid is  "<<getpid()<<endl;   
        count++;  
    }  
    else   //如果fork返回值大于0，则依旧在父进程中执行
    {  
        cout<<"I am the parent process, my pid is "<<getpid()<<endl;
        cout << "fpid =" << fpid << endl;
        count++;  
    }  
    printf("count=%d\n", count);  
    return 0;  
}  

二 运行

[root@localhost test]# g++ test.cpp -o test
[root@localhost test]# ./test
I am the parent process, my pid is 995
fpid =996
coun