Socketpair Implementing Process Communication

pipes are used to create pipelines, but a single pipe can only communicate One direction at a time, while the other end is for reading and the other for writing. If you want to process two-way communication, you must create a pair of pipelines. Specific implementations are ignored. The Socketpair can then be used to create a two-way channel. depending on the underlying implementation, the Open is a file, fd[0],fd[1], in the pipeline f[0] read end, f[1] write end.

#include <sys/types.h>

#include <sys/socket.h>

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

Domain: Choose af_local;

Type:sock_stream

Protocol: Default 0

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#include <stdio.h>                                                                           #include <stdlib.h> #include <sys/types.h> #include <sys/socket.h> #include < unistd.h> #include <errno.h> #include <string.h>int main () {&NBSP;&NBSP;&NBSP;&NBSP;INT&NBSP;FD [2];    if (Socketpair (AF_LOCAL,SOCK_STREAM,0,FD) <0) {         perror ("Sockpair");        return 1;     }    pid_t id=fork ();     if (id<0) {        &nbsP;perror ("fork");        return 2;    }     else if (id==0) {        close (fd[0]);         char buf[1024];         while (1)                 {             ssize_t _s;             strcpy (buf, "Hello bit");             write (Fd[1],buf,strlen (BUF));             _s=read (fd[1],buf,sizeof (BUF)-1);             buf[_s]= ';             printf ("Father-> child%s\n ", buf);        }         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]= ';                 printf ("Child -> father  %s\n ", buf);            }             strcpy (buf, "Hello world");             write (Fd[0],buf,strlen (BUF));        }                        close (fd[0]);        //wait child     }    return 0;

Run:

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Socketpair Implementing Process Communication