#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <pty.h>
#include <string.h>
#include <sys/wait.h>

void get_output (int fd);

int
main () 
{
  int master;
  pid_t pid;

  if ((pid = forkpty (&master, NULL, NULL, NULL)) < 0)
    {
      perror ("forkpty");
      exit (1);
    }
  /* child */
  if (pid == 0) 
    {
      char  *argv[3];
      argv[0] = "gdb";
      argv[1] = "-i=mi";
      argv[2] = '\0';
      execvp (argv[0], argv);
      /* shouldn't get here */
      exit (1);
    }
  /* parent */
  char *input[10];

  input[0] = "1-inferior-tty-set /dev/pty3\n";
  input[1] = "2-gdb-set height 0\n";
  input[2] = "3-gdb-set non-stop 1\n";
  input[3] = "4-file-list-exec-source-files\n";
  input[4] = "5-file-list-exec-source-file\n";
  input[5] = "6-gdb-show prompt\n";
  input[6] = "7-stack-info-frame\n";
  input[7] = "8-thread-info\n";
  input[8] = "9-break-list\n";
  input[9] = "q\n";

  int i;
  for (i = 0; i < 10; ++i)
    write (master, input[i], strlen (input[i]));
  get_output (master);
  wait (NULL);
}

void
get_output (int fd)
{
#define BUFSIZE 1024
  char buf[BUFSIZE];
  int i;

  for (i = 0; i < 10; ++i)
    {
      int nread;
      nread = read (fd, buf, BUFSIZE);
      if (nread > 0)
	write (STDOUT_FILENO, buf, nread);
      else
	{
	  printf ("No more output.\n");
	  break;
	}
    }
}