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| author | Peter Hurley <peter@hurleysoftware.com> | 2016-01-09 21:13:52 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-01-27 14:28:20 -0800 |
| commit | 11e1d4aa4da1d0572b00f040ae91da85d3474f4a (patch) | |
| tree | a6d0d89a51135068138156a67f8be85201ead940 /drivers/tty/tty_io.c | |
| parent | c2bb524b2e1a6eddae65139601bee24cb60856a0 (diff) | |
| download | op-kernel-dev-11e1d4aa4da1d0572b00f040ae91da85d3474f4a.zip op-kernel-dev-11e1d4aa4da1d0572b00f040ae91da85d3474f4a.tar.gz | |
tty: Consolidate noctty checks in tty_open()
Evaluate the conditions which prevent this tty being the controlling
terminal in one place, just before setting the controlling terminal.
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/tty_io.c')
| -rw-r--r-- | drivers/tty/tty_io.c | 17 |
1 files changed, 8 insertions, 9 deletions
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c index 6cffe0d..741a0d7 100644 --- a/drivers/tty/tty_io.c +++ b/drivers/tty/tty_io.c @@ -1960,7 +1960,7 @@ static struct tty_struct *tty_open_current_tty(dev_t device, struct file *filp) * Locking: tty_mutex protects get_tty_driver */ static struct tty_driver *tty_lookup_driver(dev_t device, struct file *filp, - int *noctty, int *index) + int *index) { struct tty_driver *driver; @@ -1970,7 +1970,6 @@ static struct tty_driver *tty_lookup_driver(dev_t device, struct file *filp, extern struct tty_driver *console_driver; driver = tty_driver_kref_get(console_driver); *index = fg_console; - *noctty = 1; break; } #endif @@ -1981,7 +1980,6 @@ static struct tty_driver *tty_lookup_driver(dev_t device, struct file *filp, if (driver) { /* Don't let /dev/console block */ filp->f_flags |= O_NONBLOCK; - *noctty = 1; break; } } @@ -2036,14 +2034,13 @@ retry_open: if (retval) return -ENOMEM; - noctty = filp->f_flags & O_NOCTTY; index = -1; retval = 0; tty = tty_open_current_tty(device, filp); if (!tty) { mutex_lock(&tty_mutex); - driver = tty_lookup_driver(device, filp, &noctty, &index); + driver = tty_lookup_driver(device, filp, &index); if (IS_ERR(driver)) { retval = PTR_ERR(driver); goto err_unlock; @@ -2091,10 +2088,6 @@ retry_open: tty_add_file(tty, filp); check_tty_count(tty, __func__); - if (tty->driver->type == TTY_DRIVER_TYPE_PTY && - tty->driver->subtype == PTY_TYPE_MASTER) - noctty = 1; - tty_debug_hangup(tty, "opening (count=%d)\n", tty->count); if (tty->ops->open) @@ -2127,6 +2120,12 @@ retry_open: read_lock(&tasklist_lock); spin_lock_irq(¤t->sighand->siglock); + noctty = (filp->f_flags & O_NOCTTY) || + device == MKDEV(TTY_MAJOR, 0) || + device == MKDEV(TTYAUX_MAJOR, 1) || + (tty->driver->type == TTY_DRIVER_TYPE_PTY && + tty->driver->subtype == PTY_TYPE_MASTER); + if (!noctty && current->signal->leader && !current->signal->tty && |
