ioctl Q:

[GarBear Irick]

The following program is SUPPOSED to allow me to affect the stdin of another
terminal whose /dev/ttyXX is owned by me also, but it loses.  It works if
I take out the code to try and open another device driver and simply put
chars into my OWN stdin, but I can't get it to close its own control terminal,
open a new one, and put chars into stdin.  Any clues?  Thanks to all the C
gurus out there who reply by E-mail...

#include <sys/ioctl.h>
#include <stdio.h>

/* Program should take 1st argument as terminal device driver (/dev/ttyXX),
   and echo all remaining args onto the std_IN_ of the terminal...  */

main(argc,argv)
int argc;
char *argv[];
{
 int j;
 char *s;

 if (ioctl(3,TIOCGPGRP,(char *) &j) == -1)
   (void) dup2(0,3);

/* THIS CODE LOSES */
 ioctl(0,TIOCNOTTY,"/dev/tty");
 close(0);
 fopen(0,argv[1]);
/* BACK TO OK CODE */

 for (j = 2;j < argc;j++)
  {
   for (s = argv[j];*s;s++)
     (void) ioctl(3,TIOCSTI,s);
   if (j < argc - 1)
     (void) ioctl(3,TIOCSTI," ");
  }
}
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Gary A. Irick,  Purdue University | "You can log out any time you like,
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