help on using pseudo terminals - using /dev/ptmx

["C K Kashyap" <ckkashyap@gmail.com>]

Hi all,

I recently ran into trouble with pseudo terminals while trying to make
nxterm(microwindows or nano X) work.

Could someone please help me out with the program below...where I am
trying to do a two way communication between parent and child using
pseudo-terminal.


#include <pty.h>
#include <utmp.h>
#include <fcntl.h>
#include <stdio.h>


int main(){
  int amaster,aslave;
  char name[256];
  char buffer[20];



  openpty(&amaster,&aslave,name,NULL,NULL);
    fcntl (amaster, F_SETFL, O_NONBLOCK);
    fcntl (aslave, F_SETFL, O_NONBLOCK);



  printf("Master = %d, Slave = %d\n",amaster,aslave);
  printf("NAME %s\n",name);

  if(fork()==0){
    //login_tty(aslave);
    read(aslave,buffer,10);
    printf("Child: %s\n",buffer);
    write(aslave,"ABCDEFGHIJ\n",11);
    sleep(5);
    exit(0);

  }
  //  login_tty(amaster);
  write(amaster,"1234567890\n",11);
  read(amaster,buffer,10);
  printf("Parent: %s\n",buffer);

  sleep(5);
}



-- 
Regards,
Kashyap