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Newsgroups: comp.unix.bsd
Subject: Pipe question
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Distribution: USA
Organization: University of Utah CS Dept
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Newsgroups: comp.unix.questions
Subject: Pipe question
Summary: 
Expires: 
Sender: 
Followup-To: 
Distribution: USA
Organization: University of Utah CS Dept
Keywords: 


	I am trying to set up a circular pipe with telnet.  I want to 
be able to read telnets stdout and write telnets stdin.  Here is what
I have so far.  But it doesn't read anything.  I have used pipes like
this with other applications, and they seemed to work.

#include <stdio.h>

int main(argc, argv)
     int argc;
     char **argv;
{
  int pid;
  int fd1[2],fd2[2];
  char buff[1000];
  
  pipe(fd1);
  pipe(fd2);
  close(1);
  dup(fd1[1]);
  close(0);
  dup(fd2[0]);

  pid=fork();
  if(!pid) {                      /*These means we are the child process*/
    
    close(0);
    dup(fd1[0]);
    close(1);
    dup(fd2[1]);
    sleep(1);
    fprintf(stderr,"launching telnet\n");
    execlp("telnet","peruvian.utah.edu",NULL);
    fprintf(stderr,"Could not run telnet\n");
    exit(0);
  }

/*this code is the parent process whos stdout will go to the stdin of telnet*/
  sleep(20);
  fprintf(stderr,"about to read\n");
  for(;;) {
    read(0,buff,1);
    fprintf(stderr,"%c",buff[0]);
  }
}


	Any help is greatly appreciated

	Thanks,
	R. Todd Frazier
	rfrazier@peruvian.utah.edu