static int pty_resize(struct tty_struct *tty, struct winsize *ws)
{
struct pid *pgrp, *rpgrp;
struct tty_struct *pty = tty->link;
/* For a PTY we need to lock the tty side */
mutex_lock(&tty->winsize_mutex);
if (!memcmp(ws, &tty->winsize, sizeof(*ws)))
goto done;
/* Signal the foreground process group of both ptys */
pgrp = tty_get_pgrp(tty);
rpgrp = tty_get_pgrp(pty);
if (pgrp)
kill_pgrp(pgrp, SIGWINCH, 1);
if (rpgrp != pgrp && rpgrp)
kill_pgrp(rpgrp, SIGWINCH, 1);
put_pid(pgrp);
put_pid(rpgrp);
tty->winsize = *ws;
pty->winsize = *ws; /* Never used so will go away soon */
done:
mutex_unlock(&tty->winsize_mutex);
return 0;
}
/* Send a signal to the slave */
static int pty_signal(struct tty_struct *tty, int sig)
{
struct pid *pgrp;
if (tty->link) {
pgrp = tty_get_pgrp(tty->link);
if (pgrp)
kill_pgrp(pgrp, sig, 1);
put_pid(pgrp);
}
return 0;
}
/* Send a signal to the slave */
static int pty_signal(struct tty_struct *tty, int sig)
{
struct pid *pgrp;
if (sig != SIGINT && sig != SIGQUIT && sig != SIGTSTP)
return -EINVAL;
if (tty->link) {
pgrp = tty_get_pgrp(tty->link);
if (pgrp)
kill_pgrp(pgrp, sig, 1);
put_pid(pgrp);
}
return 0;
}
