socketpair()进程通信

socketpair 能够实现父子进程间的全双工通信

socketpair 函数原型：

int socketpair(int d, int type, int protocol, int sv[2]);

 

code:

#include<sys/types.h>
#include<sys/socket.h>
#include<stdio.h>
#include<string.h>
/*
socketpair();实现全双工通信
*/

int main()
{
 int fd[2];
 int ret;
 pid_t pid;
 ret = socketpair(AF_UNIX,SOCK_STREAM,0,fd);
 if(ret < 0)
 printf("socketpair call wrong\n");
 pid = fork();
 if(pid < 0)
 printf("fork wrong\n");
 else if(pid == 0)  //child process
 {
  sleep(2);
  close(fd[1]);
  int val = 0;
  int rev;
  while(1)
  {
  read(fd[0],&rev,sizeof(rev));
  printf("child rev data: %d\n",rev);
  val ++;
  printf("child send data:%d\n",val);
  write(fd[0],&val,sizeof(val));
  if(val == 10)
  break;
  }
 }else{     //father process;
  close(fd[0]);
  int val = 0;
  int rev;
  while(1)
  {
   val ++;
   printf("father send data:%d\n",val);
   write(fd[1],&val,sizeof(val));
   if(val == 10)
   break;
   sleep(1);
   read(fd[1],&rev,sizeof(rev));
   printf("father rev data:%d\n",rev);
  }
 }
 waitpid(pid,NULL,0);
}