Advanced I/O-----socketpair

Socketpair

Socketpair: Compared to the previously mentioned pipeline, Socketpair is a full-duplex mode of communication, one end of which can be read or written, for which I understand:

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Suppose now we are using Socketpair locally, the client is fd[0], the server side is fd[1], when the server writes data to the client, writes data from the write side of the fd[1], and reads the data from the read side of the fd[1], and vice versa from the client.

The following is an implementation of a Socketpair version of interprocess communication

#include <sys/types.h>/* See NOTES */#include <sys/socket.h> int socketpair (int domain, int type, int protocol, int sv[2]);

Domian is the way to operate, because we are local so with af_local.

Type is the mode of transmission, we use the TCP streaming service, Sock_stream.

Protocol for control, we choose to fill the default 0,

SV is the number of file descriptors to create, note (this file descriptor is a network file descriptor, which can be said to be virtual).

  1  #include <stdio.h>  2  #include <sys/types.h>  3 # include<sys/socket.h>  4  #include <unistd.h>  5  #include <string.h >  6 int main ()   7 {  8     int  Fd[2];  9     if (Socketpair (AF_LOCAL,SOCK_STREAM,0,FD) <0)  10      { 11         perror ("Socketpair");  12     } 13     char buf[1024]; 14      pid_t id=fork ();  15     if (id<0) { 16          perror ("fork");  17     } Else if (id==0) { 18         close (fd[0]); 19      &Nbsp;   while (1)  20         { 21              sleep (1); 22              memset (buf, ' + ', sizeof (BUF)-1); 23              strcpy (buf, "child hello  World "),  24             write (Fd[1],buf, Strlen (BUF) +1);  25             ssize_t  size=read (fd[1],buf,sizeof (BUF)-1); 26              if (size>0)  27              { 28                  buf[size]= ' &nbs ';p;29                  printf ("parents say::%s\n", buf); 30              } 31         } 32              close (fd[1]); 33      } 34     else{ 35              close (fd[1]); 36              while (1)  37              { 38                  sleep (2); 39                  ssize_t size=read (fd[0],buf,sizeof (BUF)-1); 40                  if (size>0)  41                  { 42                      buf[size]= '  43 ';                       printf ("child say::%s\n", buf); 44                  } 45                  memset (buf, ' + ', sizeof (BUF)); 46                  strcpy (buf, "Parent  hello world "); 47                 write (Fd[0], Buf,strlen (BUF) +1);  48             }  49             close (Fd[0]);  50       51     } 52  53      return 0; 54 }

The Socketpair realizes full duplex communication mode.

This article is from the "Traces" blog, be sure to keep this source http://wpfbcr.blog.51cto.com/10696766/1784271

Advanced I/O-----socketpair