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From: bruey@cpsin2.cps.msu.edu
Newsgroups: comp.lang.c
Subject: help on interprocess communication
Message-ID: <6456@cps3xx.UUCP>
Date: 14 Feb 90 18:23:51 GMT
Sender: usenet@cps3xx.UUCP
Reply-To: bruey@cpsin2.cps.msu.edu ()
Distribution: usa
Organization: Dept. of Computer Science, Michigan State University
Lines: 33


Can any of you brainy netlanders give me a hint why this
doesn't work?  I've been cursing at this code for days
and I can't get it to work.  (I'm not even sure that the
forks are in the right order.  So basically, I'm lost.)  


#include<stdio.h>
main()  
{
/*  yes, I know I don't need all of these declarations, but
    this isn't the only part of the program  */ 
  int pid;
  int id1,id2,id3;
int rc=0,status,parent;
int filedes[2];
char *a,*buf1,*buf;

 
 pipe(filedes);
 if (fork())
   {
    printf("%d %d are filedes \n",filedes[0],filedes[1]);
    buf = "first message"; 
    write(filedes[1],buf,14);
    if(fork()) 
     { 
      read(filedes[1],buf1,14); 
       printf("in second   %s \n",buf1);    
     } 
   }

}