forked from luck/tmp_suning_uos_patched
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>
This commit is contained in:
parent
71a5cd8a4a
commit
2812d9e9fd
|
@ -2138,37 +2138,15 @@ extern ssize_t redirected_tty_write(struct file *, const char __user *,
|
|||
|
||||
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);
|
||||
}
|
||||
|
||||
|
||||
|
|
|
@ -390,10 +390,10 @@ EXPORT_SYMBOL_GPL(tty_find_polling_driver);
|
|||
* Locking: ctrl_lock
|
||||
*/
|
||||
|
||||
int tty_check_change(struct tty_struct *tty)
|
||||
int __tty_check_change(struct tty_struct *tty, int sig)
|
||||
{
|
||||
unsigned long flags;
|
||||
struct pid *pgrp;
|
||||
struct pid *pgrp, *tty_pgrp;
|
||||
int ret = 0;
|
||||
|
||||
if (current->signal->tty != tty)
|
||||
|
@ -403,33 +403,35 @@ int tty_check_change(struct tty_struct *tty)
|
|||
pgrp = task_pgrp(current);
|
||||
|
||||
spin_lock_irqsave(&tty->ctrl_lock, flags);
|
||||
|
||||
if (!tty->pgrp) {
|
||||
printk(KERN_WARNING "tty_check_change: tty->pgrp == NULL!\n");
|
||||
goto out_unlock;
|
||||
}
|
||||
if (pgrp == tty->pgrp)
|
||||
goto out_unlock;
|
||||
tty_pgrp = tty->pgrp;
|
||||
spin_unlock_irqrestore(&tty->ctrl_lock, flags);
|
||||
|
||||
if (is_ignored(SIGTTOU))
|
||||
goto out_rcuunlock;
|
||||
if (is_current_pgrp_orphaned()) {
|
||||
ret = -EIO;
|
||||
goto out_rcuunlock;
|
||||
if (tty_pgrp && pgrp != tty->pgrp) {
|
||||
if (is_ignored(sig)) {
|
||||
if (sig == SIGTTIN)
|
||||
ret = -EIO;
|
||||
} else if (is_current_pgrp_orphaned())
|
||||
ret = -EIO;
|
||||
else {
|
||||
kill_pgrp(pgrp, sig, 1);
|
||||
set_thread_flag(TIF_SIGPENDING);
|
||||
ret = -ERESTARTSYS;
|
||||
}
|
||||
}
|
||||
kill_pgrp(pgrp, SIGTTOU, 1);
|
||||
rcu_read_unlock();
|
||||
set_thread_flag(TIF_SIGPENDING);
|
||||
ret = -ERESTARTSYS;
|
||||
return ret;
|
||||
out_unlock:
|
||||
spin_unlock_irqrestore(&tty->ctrl_lock, flags);
|
||||
out_rcuunlock:
|
||||
rcu_read_unlock();
|
||||
|
||||
if (!tty_pgrp) {
|
||||
pr_warn("%s: tty_check_change: sig=%d, tty->pgrp == NULL!\n",
|
||||
tty_name(tty), sig);
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
int tty_check_change(struct tty_struct *tty)
|
||||
{
|
||||
return __tty_check_change(tty, SIGTTOU);
|
||||
}
|
||||
EXPORT_SYMBOL(tty_check_change);
|
||||
|
||||
static ssize_t hung_up_tty_read(struct file *file, char __user *buf,
|
||||
|
|
|
@ -423,6 +423,7 @@ extern int tty_paranoia_check(struct tty_struct *tty, struct inode *inode,
|
|||
const char *routine);
|
||||
extern const char *tty_name(const struct tty_struct *tty);
|
||||
extern void tty_wait_until_sent(struct tty_struct *tty, long timeout);
|
||||
extern int __tty_check_change(struct tty_struct *tty, int sig);
|
||||
extern int tty_check_change(struct tty_struct *tty);
|
||||
extern void __stop_tty(struct tty_struct *tty);
|
||||
extern void stop_tty(struct tty_struct *tty);
|
||||
|
|
Loading…
Reference in New Issue
Block a user