pipe用來建立管道,但是單個管道隻能進行單向通信,一頓用于讀,一段用于寫,如果要實作程序雙向通信,必須建立一對管道。
而socketpair則可以用來建立雙向通信的管道具體實作如下:
實作,打開的還是一個檔案,fd[0],fd[1],管道中f[0]讀端,f[1]寫端。
#include <sys/types.h>
#include <sys/socket.h>
int socketpair(int domain, int type, int protocol, int sv[2]);
domain:選用AF_LOCAL;
type:SOCK_STREAM
protocol:預設0
![](https://img.laitimes.com/img/_0nNw4CM6IyYiwiM6ICdiwiI0gTMx81dsQWZ4lmZf1GLlpXazVmcvwFciV2dsQXYtJ3bm9CX9s2RkBnVHFmb1clWvB3MaVnRtp1XlBXe0xCMy81dvRWYoNHLwEzX5xCMx8FesU2cfdGLwMzX0xiRGZkRGZ0Xy9GbvNGLpZTY1EmMZVDUSFTU4VFRR9Fd4VGdsYTMfVmepNHLrJXYtJXZ0F2dvwVZnFWbp1zczV2YvJHctM3cv1Ce-cmbw5SO1ETN1UDN5UWYhhTN5ETMzYzX4UjMzMTMyAzLclDMyIDMy8CXn9Gbi9CXzV2Zh1WavwVbvNmLvR3YxUjLyM3Lc9CX6MHc0RHaiojIsJye.png)
#include<stdio.h>
#include<stdlib.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<string.h>
int main()
{
int fd[2];
if(socketpair(AF_LOCAL,SOCK_STREAM,0,fd)<0){
perror("sockpair");
return 1;
}
pid_t id=fork();
if(id<0){
perror("fork");
return 2;
}
else if(id==0)
{
close(fd[0]);
char buf[1024];
while(1)
{
strcpy(buf,"hello world");
write(fd[1],buf,strlen(buf));
ssize_t _s=read(fd[1],buf,sizeof(buf)-1);
buf[_s]='\0';
printf("father->child:%s\n",buf);
sleep(1);
}
close(fd[1]);
}
else
{
close(fd[1]);
char buf[1024];
while(1)
{
ssize_t _s=read(fd[0],buf,sizeof(buf)-1);
if(_s>0)
{
buf[_s]='\0';
printf("child->father:%s\n",buf);
sleep(1);
}
strcpy(buf,"hello mygirl");
write(fd[0],buf,strlen(buf));
}
close(fd[0]);
}
return 0;
}