Getting a program to type into another program

[usernamer]

I have a program, test, in which you need to enter the character 'y', followed by pressing <enter>.
I have a second program which runs the program, test, in the terminal, but I'm having serious issues of entering the character 'y' (and the enter)...:(

This is as close as I've got so far:

#include <stdio.h>
#include <unistd.h>

int main(void)
{
FILE *terminal;
char *name;

name = ttyname(0);
terminal = fopen( ttyname(0), "w" );

system( "./test %s", name );
fprintf( terminal, "y\r" );

fclose(terminal);

return 0;
}


- This will run the correct program to the correct terminal, and then print 'y' once you exit the program.
- Is there any way to get it to type the 'y' in the program (as though you open up the program, then hit 'y' and <enter> on the keyboard)?

Cheers for any light shed on the issue.

[ofnuts]

http://jineshkj.wordpress.com/2006/12/22/how-to-capture-stdin-stdout-and-stderr-of-child-program/

Then you write a "y" to the right file descriptor (and don't forget to fflush()).

[usernamer]

Thanks a lot, I'll look into that.