/*
 * Functions you may use for your shell.
 * See FAQ Question 4.
 *
 * CS 3214 Fall 2011, Godmar Back.
 */

/**
 * Assign ownership of ther terminal to process group
 * pgrp, restoring its terminal state if provided.
 *
 * Before printing a new prompt, the shell should
 * invoke this function with its own process group
 * id (obtained on startup via getpgrp()) and a
 * sane terminal state (obtained on startup via
 * esh_sys_tty_init()).
 */
static void
give_terminal_to(pid_t pgrp, struct termios *pg_tty_state)
{
    esh_signal_block(SIGTTOU);
    int rc = tcsetpgrp(esh_sys_tty_getfd(), pgrp);
    if (rc == -1)
        esh_sys_fatal_error("tcsetpgrp: ");

    if (pg_tty_state)
        esh_sys_tty_restore(pg_tty_state);
    esh_signal_unblock(SIGTTOU);
}