tty: Combine SIGTTOU/SIGTTIN handling
The job_control() check in n_tty_read() has nearly identical purpose
and results as tty_check_change(). Both functions' purpose is to
determine if the current task's pgrp is the foreground pgrp for the tty,
and if not, to signal the current pgrp.
Introduce __tty_check_change() which takes the signal to send
and performs the shared operations for job control() and
tty_check_change().
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index ff728d3..fb8ccbf 100644
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -2138,37 +2138,15 @@
static int job_control(struct tty_struct *tty, struct file *file)
{
- struct pid *pgrp;
-
/* Job control check -- must be done at start and after
every sleep (POSIX.1 7.1.1.4). */
/* NOTE: not yet done after every sleep pending a thorough
check of the logic of this change. -- jlc */
/* don't stop on /dev/console */
- if (file->f_op->write == redirected_tty_write ||
- current->signal->tty != tty)
+ if (file->f_op->write == redirected_tty_write)
return 0;
- rcu_read_lock();
- pgrp = task_pgrp(current);
-
- spin_lock_irq(&tty->ctrl_lock);
- if (!tty->pgrp)
- printk(KERN_ERR "n_tty_read: no tty->pgrp!\n");
- else if (pgrp != tty->pgrp) {
- spin_unlock_irq(&tty->ctrl_lock);
- if (is_ignored(SIGTTIN) || is_current_pgrp_orphaned()) {
- rcu_read_unlock();
- return -EIO;
- }
- kill_pgrp(pgrp, SIGTTIN, 1);
- rcu_read_unlock();
- set_thread_flag(TIF_SIGPENDING);
- return -ERESTARTSYS;
- }
- spin_unlock_irq(&tty->ctrl_lock);
- rcu_read_unlock();
- return 0;
+ return __tty_check_change(tty, SIGTTIN);
}