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tty: Add termiox

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We need a way to describe the various additional modes and flow control
features that random weird hardware shows up and software such as wine
wants to emulate as Windows supports them.

TCGETX/TCSETX and the termiox ioctl are a SYS5 extension that we might as
well adopt. This patches adds the structures and the basic ioctl interfaces
when the TCGETX etc defines are added for an architecture. Drivers wishing
to use this stuff need to add new methods.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alan Cox
2008-10-13 10:38:18 +01:00
committed by Linus Torvalds
parent 5aaa70a80f
commit 1d65b4a088
5 changed files with 87 additions and 0 deletions
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58
drivers/char/tty_ioctl.c
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@@ -579,6 +579,50 @@ static int get_termio(struct tty_struct *tty, struct termio __user *termio)
return 0;
}
#ifdef TCGETX
/**
* set_termiox - set termiox fields if possible
* @tty: terminal
* @arg: termiox structure from user
* @opt: option flags for ioctl type
*
* Implement the device calling points for the SYS5 termiox ioctl
* interface in Linux
*/
static int set_termiox(struct tty_struct *tty, void __user *arg, int opt)
{
struct termiox tnew;
struct tty_ldisc *ld;
if (tty->termiox == NULL)
return -EINVAL;
if (copy_from_user(&tnew, arg, sizeof(struct termiox)))
return -EFAULT;
ld = tty_ldisc_ref(tty);
if (ld != NULL) {
if ((opt & TERMIOS_FLUSH) && ld->ops->flush_buffer)
ld->ops->flush_buffer(tty);
tty_ldisc_deref(ld);
}
if (opt & TERMIOS_WAIT) {
tty_wait_until_sent(tty, 0);
if (signal_pending(current))
return -EINTR;
}
mutex_lock(&tty->termios_mutex);
if (tty->ops->set_termiox)
tty->ops->set_termiox(tty, &tnew);
mutex_unlock(&tty->termios_mutex);
return 0;
}
#endif
static unsigned long inq_canon(struct tty_struct *tty)
{
int nr, head, tail;
@@ -936,6 +980,20 @@ int tty_mode_ioctl(struct tty_struct *tty, struct file *file,
return -EFAULT;
return 0;
#endif
#ifdef TCGETX
case TCGETX:
if (real_tty->termiox == NULL)
return -EINVAL;
if (copy_to_user(p, real_tty->termiox, sizeof(struct termiox)))
return -EFAULT;
return 0;
case TCSETX:
return set_termiox(real_tty, p, 0);
case TCSETXW:
return set_termiox(real_tty, p, TERMIOS_WAIT);
case TCSETXF:
return set_termiox(real_tty, p, TERMIOS_FLUSH);
#endif
case TIOCGSOFTCAR:
/* FIXME: for correctness we may need to take the termios
lock here - review */