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这个比较简单,通过前面几个作业,大家一定知道如何编译了,所以,现在就只给出代码.大家自行编译吧.
我编写的都是C++代码,所以,希望朋友们起名的时候,应该是*.CPP才对哦(有点"肺"话啊!)
/*
作者:刘海涛
功能:在LINUX下,用fork生成3个子进程,并使用系统调用PIPE创建管道.使得这3个子进程共用一个管道
环境:G++,Rad Hat Enterprise Linux,gedit
时间:2008.4.1
*/
#include<iostream>
#include<stdio.h>
using namespace std;
int main()
{
int i,r,p[3],fd[2];
char buffer[100],temp[100];
pipe(fd);
while((p[0]=fork())==-1);
if(p[0]==0)
{
lockf(fd[1],1,0);
sprintf(buffer,"child process p1 is sending mess!/n");
cout<<"child process"<<" "<<"p[0]"<<endl;
write(fd[1],buffer,100);
sleep(1);
lockf(fd[1],0,0);
exit(0);
}
else
{
while((p[1]=fork())==-1);
if(p[1]==0)
{
lockf(fd[1],1,0);
sprintf(buffer,"child process p2 is sending mess!/n");
cout<<"child process"<<" "<<"p[1]"<<endl;
write(fd[1],buffer,100);
sleep(1);
lockf(fd[1],0,0);
exit(0);
}
else
{
while((p[2]=fork())==-1);
if(p[2]==0)
{
lockf(fd[1],1,0);
sprintf(buffer,"child process p3 is sending mess!/n");
cout<<"child process"<<" "<<"p[2]"<<endl;
write(fd[1],buffer,100);
sleep(1);
lockf(fd[1],0,0);
exit(0);
}
//wait(0);
for(i=0;i<3;i++)
{
if(r=read(fd[0],temp,100)==-1)
{
cout<<"can`t read pipe";
}
else
{
cout<<"the pipe is:"<<temp<<endl;
}
}
exit(0);
}
}
return 0;
}
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