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linux-next/drivers/char/tty_ioctl.c
Alan Cox 78137e3b34 [PATCH] tty: improve encode_baud_rate logic 
Mostly so people can see the work in progress.  This enhances the encode
function which isn't currently used in the base tree but is when using some of
the testing tty patches.

This resolves a problem with some hardware where applications got confusing
information from the tty ioctls.  Correct but confusing.

In some situations asking for, say, 9600 baud actually gets you 9595 baud or
similar near-miss values.  With the old code this meant that a request for
B9600 got a return of BOTHER, 9595 which programs interpreted as a failure.

The new code now works on the following basis

- If you ask for specific rate via BOTHER, you get a precise return

- If you ask for a standard Bfoo rate and the result is close you get a Bfoo
  return

- If you ask for a standard Bfoo rate and get something way off you get a
  BOTHER/rate return

This seems to fix up the cases I've found where this broke compatibility.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11 10:51:32 -08:00

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/*
* linux/drivers/char/tty_ioctl.c
*
* Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
*
* Modified by Fred N. van Kempen, 01/29/93, to add line disciplines
* which can be dynamically activated and de-activated by the line
* discipline handling modules (like SLIP).
*/
#include <linux/types.h>
#include <linux/termios.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/tty.h>
#include <linux/fcntl.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/bitops.h>
#include <linux/mutex.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#undef TTY_DEBUG_WAIT_UNTIL_SENT
#undef DEBUG
/*
* Internal flag options for termios setting behavior
*/
#define TERMIOS_FLUSH 1
#define TERMIOS_WAIT 2
#define TERMIOS_TERMIO 4
#define TERMIOS_OLD 8
/**
* tty_wait_until_sent - wait for I/O to finish
* @tty: tty we are waiting for
* @timeout: how long we will wait
*
* Wait for characters pending in a tty driver to hit the wire, or
* for a timeout to occur (eg due to flow control)
*
* Locking: none
*/
void tty_wait_until_sent(struct tty_struct * tty, long timeout)
{
DECLARE_WAITQUEUE(wait, current);
#ifdef TTY_DEBUG_WAIT_UNTIL_SENT
char buf[64];
printk(KERN_DEBUG "%s wait until sent...\n", tty_name(tty, buf));
#endif
if (!tty->driver->chars_in_buffer)
return;
add_wait_queue(&tty->write_wait, &wait);
if (!timeout)
timeout = MAX_SCHEDULE_TIMEOUT;
do {
#ifdef TTY_DEBUG_WAIT_UNTIL_SENT
printk(KERN_DEBUG "waiting %s...(%d)\n", tty_name(tty, buf),
tty->driver->chars_in_buffer(tty));
#endif
set_current_state(TASK_INTERRUPTIBLE);
if (signal_pending(current))
goto stop_waiting;
if (!tty->driver->chars_in_buffer(tty))
break;
timeout = schedule_timeout(timeout);
} while (timeout);
if (tty->driver->wait_until_sent)
tty->driver->wait_until_sent(tty, timeout);
stop_waiting:
set_current_state(TASK_RUNNING);
remove_wait_queue(&tty->write_wait, &wait);
}
EXPORT_SYMBOL(tty_wait_until_sent);
static void unset_locked_termios(struct ktermios *termios,
struct ktermios *old,
struct ktermios *locked)
{
int i;
#define NOSET_MASK(x,y,z) (x = ((x) & ~(z)) | ((y) & (z)))
if (!locked) {
printk(KERN_WARNING "Warning?!? termios_locked is NULL.\n");
return;
}
NOSET_MASK(termios->c_iflag, old->c_iflag, locked->c_iflag);
NOSET_MASK(termios->c_oflag, old->c_oflag, locked->c_oflag);
NOSET_MASK(termios->c_cflag, old->c_cflag, locked->c_cflag);
NOSET_MASK(termios->c_lflag, old->c_lflag, locked->c_lflag);
termios->c_line = locked->c_line ? old->c_line : termios->c_line;
for (i=0; i < NCCS; i++)
termios->c_cc[i] = locked->c_cc[i] ?
old->c_cc[i] : termios->c_cc[i];
/* FIXME: What should we do for i/ospeed */
}
/*
* Routine which returns the baud rate of the tty
*
* Note that the baud_table needs to be kept in sync with the
* include/asm/termbits.h file.
*/
static const speed_t baud_table[] = {
0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
9600, 19200, 38400, 57600, 115200, 230400, 460800,
#ifdef __sparc__
76800, 153600, 307200, 614400, 921600
#else
500000, 576000, 921600, 1000000, 1152000, 1500000, 2000000,
2500000, 3000000, 3500000, 4000000
#endif
};
#ifndef __sparc__
static const tcflag_t baud_bits[] = {
B0, B50, B75, B110, B134, B150, B200, B300, B600,
B1200, B1800, B2400, B4800, B9600, B19200, B38400,
B57600, B115200, B230400, B460800, B500000, B576000,
B921600, B1000000, B1152000, B1500000, B2000000, B2500000,
B3000000, B3500000, B4000000
};
#else
static const tcflag_t baud_bits[] = {
B0, B50, B75, B110, B134, B150, B200, B300, B600,
B1200, B1800, B2400, B4800, B9600, B19200, B38400,
B57600, B115200, B230400, B460800, B76800, B153600,
B307200, B614400, B921600
};
#endif
static int n_baud_table = ARRAY_SIZE(baud_table);
/**
* tty_termios_baud_rate
* @termios: termios structure
*
* Convert termios baud rate data into a speed. This should be called
* with the termios lock held if this termios is a terminal termios
* structure. May change the termios data. Device drivers can call this
* function but should use ->c_[io]speed directly as they are updated.
*
* Locking: none
*/
speed_t tty_termios_baud_rate(struct ktermios *termios)
{
unsigned int cbaud;
cbaud = termios->c_cflag & CBAUD;
#ifdef BOTHER
/* Magic token for arbitary speed via c_ispeed/c_ospeed */
if (cbaud == BOTHER)
return termios->c_ospeed;
#endif
if (cbaud & CBAUDEX) {
cbaud &= ~CBAUDEX;
if (cbaud < 1 || cbaud + 15 > n_baud_table)
termios->c_cflag &= ~CBAUDEX;
else
cbaud += 15;
}
return baud_table[cbaud];
}
EXPORT_SYMBOL(tty_termios_baud_rate);
/**
* tty_termios_input_baud_rate
* @termios: termios structure
*
* Convert termios baud rate data into a speed. This should be called
* with the termios lock held if this termios is a terminal termios
* structure. May change the termios data. Device drivers can call this
* function but should use ->c_[io]speed directly as they are updated.
*
* Locking: none
*/
speed_t tty_termios_input_baud_rate(struct ktermios *termios)
{
#ifdef IBSHIFT
unsigned int cbaud = (termios->c_cflag >> IBSHIFT) & CBAUD;
if (cbaud == B0)
return tty_termios_baud_rate(termios);
/* Magic token for arbitary speed via c_ispeed*/
if (cbaud == BOTHER)
return termios->c_ispeed;
if (cbaud & CBAUDEX) {
cbaud &= ~CBAUDEX;
if (cbaud < 1 || cbaud + 15 > n_baud_table)
termios->c_cflag &= ~(CBAUDEX << IBSHIFT);
else
cbaud += 15;
}
return baud_table[cbaud];
#else
return tty_termios_baud_rate(termios);
#endif
}
EXPORT_SYMBOL(tty_termios_input_baud_rate);
#ifdef BOTHER
/**
* tty_termios_encode_baud_rate
* @termios: ktermios structure holding user requested state
* @ispeed: input speed
* @ospeed: output speed
*
* Encode the speeds set into the passed termios structure. This is
* used as a library helper for drivers os that they can report back
* the actual speed selected when it differs from the speed requested
*
* For maximal back compatibility with legacy SYS5/POSIX *nix behaviour
* we need to carefully set the bits when the user does not get the
* desired speed. We allow small margins and preserve as much of possible
* of the input intent to keep compatiblity.
*
* Locking: Caller should hold termios lock. This is already held
* when calling this function from the driver termios handler.
*/
void tty_termios_encode_baud_rate(struct ktermios *termios, speed_t ibaud, speed_t obaud)
{
int i = 0;
int ifound = -1, ofound = -1;
int iclose = ibaud/50, oclose = obaud/50;
int ibinput = 0;
termios->c_ispeed = ibaud;
termios->c_ospeed = obaud;
/* If the user asked for a precise weird speed give a precise weird
answer. If they asked for a Bfoo speed they many have problems
digesting non-exact replies so fuzz a bit */
if ((termios->c_cflag & CBAUD) == BOTHER)
oclose = 0;
if (((termios->c_cflag >> IBSHIFT) & CBAUD) == BOTHER)
iclose = 0;
if ((termios->c_cflag >> IBSHIFT) & CBAUD)
ibinput = 1; /* An input speed was specified */
termios->c_cflag &= ~CBAUD;
do {
if (obaud - oclose >= baud_table[i] && obaud + oclose <= baud_table[i]) {
termios->c_cflag |= baud_bits[i];
ofound = i;
}
if (ibaud - iclose >= baud_table[i] && ibaud + iclose <= baud_table[i]) {
/* For the case input == output don't set IBAUD bits if the user didn't do so */
if (ofound != i || ibinput)
termios->c_cflag |= (baud_bits[i] << IBSHIFT);
ifound = i;
}
}
while(++i < n_baud_table);
if (ofound == -1)
termios->c_cflag |= BOTHER;
/* Set exact input bits only if the input and output differ or the
user already did */
if (ifound == -1 && (ibaud != obaud || ibinput))
termios->c_cflag |= (BOTHER << IBSHIFT);
}
EXPORT_SYMBOL_GPL(tty_termios_encode_baud_rate);
#endif
/**
* tty_get_baud_rate - get tty bit rates
* @tty: tty to query
*
* Returns the baud rate as an integer for this terminal. The
* termios lock must be held by the caller and the terminal bit
* flags may be updated.
*
* Locking: none
*/
speed_t tty_get_baud_rate(struct tty_struct *tty)
{
speed_t baud = tty_termios_baud_rate(tty->termios);
if (baud == 38400 && tty->alt_speed) {
if (!tty->warned) {
printk(KERN_WARNING "Use of setserial/setrocket to "
"set SPD_* flags is deprecated\n");
tty->warned = 1;
}
baud = tty->alt_speed;
}
return baud;
}
EXPORT_SYMBOL(tty_get_baud_rate);
/**
* change_termios - update termios values
* @tty: tty to update
* @new_termios: desired new value
*
* Perform updates to the termios values set on this terminal. There
* is a bit of layering violation here with n_tty in terms of the
* internal knowledge of this function.
*
* Locking: termios_sem
*/
static void change_termios(struct tty_struct * tty, struct ktermios * new_termios)
{
int canon_change;
struct ktermios old_termios = *tty->termios;
struct tty_ldisc *ld;
/*
* Perform the actual termios internal changes under lock.
*/
/* FIXME: we need to decide on some locking/ordering semantics
for the set_termios notification eventually */
mutex_lock(&tty->termios_mutex);
*tty->termios = *new_termios;
unset_locked_termios(tty->termios, &old_termios, tty->termios_locked);
canon_change = (old_termios.c_lflag ^ tty->termios->c_lflag) & ICANON;
if (canon_change) {
memset(&tty->read_flags, 0, sizeof tty->read_flags);
tty->canon_head = tty->read_tail;
tty->canon_data = 0;
tty->erasing = 0;
}
if (canon_change && !L_ICANON(tty) && tty->read_cnt)
/* Get characters left over from canonical mode. */
wake_up_interruptible(&tty->read_wait);
/* See if packet mode change of state. */
if (tty->link && tty->link->packet) {
int old_flow = ((old_termios.c_iflag & IXON) &&
(old_termios.c_cc[VSTOP] == '\023') &&
(old_termios.c_cc[VSTART] == '\021'));
int new_flow = (I_IXON(tty) &&
STOP_CHAR(tty) == '\023' &&
START_CHAR(tty) == '\021');
if (old_flow != new_flow) {
tty->ctrl_status &= ~(TIOCPKT_DOSTOP | TIOCPKT_NOSTOP);
if (new_flow)
tty->ctrl_status |= TIOCPKT_DOSTOP;
else
tty->ctrl_status |= TIOCPKT_NOSTOP;
wake_up_interruptible(&tty->link->read_wait);
}
}
if (tty->driver->set_termios)
(*tty->driver->set_termios)(tty, &old_termios);
ld = tty_ldisc_ref(tty);
if (ld != NULL) {
if (ld->set_termios)
(ld->set_termios)(tty, &old_termios);
tty_ldisc_deref(ld);
}
mutex_unlock(&tty->termios_mutex);
}
/**
* set_termios - set termios values for a tty
* @tty: terminal device
* @arg: user data
* @opt: option information
*
* Helper function to prepare termios data and run neccessary other
* functions before using change_termios to do the actual changes.
*
* Locking:
* Called functions take ldisc and termios_sem locks
*/
static int set_termios(struct tty_struct * tty, void __user *arg, int opt)
{
struct ktermios tmp_termios;
struct tty_ldisc *ld;
int retval = tty_check_change(tty);
if (retval)
return retval;
memcpy(&tmp_termios, tty->termios, sizeof(struct ktermios));
if (opt & TERMIOS_TERMIO) {
if (user_termio_to_kernel_termios(&tmp_termios,
(struct termio __user *)arg))
return -EFAULT;
#ifdef TCGETS2
} else if (opt & TERMIOS_OLD) {
if (user_termios_to_kernel_termios_1(&tmp_termios,
(struct termios __user *)arg))
return -EFAULT;
} else {
if (user_termios_to_kernel_termios(&tmp_termios,
(struct termios2 __user *)arg))
return -EFAULT;
}
#else
} else if (user_termios_to_kernel_termios(&tmp_termios,
(struct termios __user *)arg))
return -EFAULT;
#endif
/* If old style Bfoo values are used then load c_ispeed/c_ospeed with the real speed
so its unconditionally usable */
tmp_termios.c_ispeed = tty_termios_input_baud_rate(&tmp_termios);
tmp_termios.c_ospeed = tty_termios_baud_rate(&tmp_termios);
ld = tty_ldisc_ref(tty);
if (ld != NULL) {
if ((opt & TERMIOS_FLUSH) && ld->flush_buffer)
ld->flush_buffer(tty);
tty_ldisc_deref(ld);
}
if (opt & TERMIOS_WAIT) {
tty_wait_until_sent(tty, 0);
if (signal_pending(current))
return -EINTR;
}
change_termios(tty, &tmp_termios);
return 0;
}
static int get_termio(struct tty_struct * tty, struct termio __user * termio)
{
if (kernel_termios_to_user_termio(termio, tty->termios))
return -EFAULT;
return 0;
}
static unsigned long inq_canon(struct tty_struct * tty)
{
int nr, head, tail;
if (!tty->canon_data || !tty->read_buf)
return 0;
head = tty->canon_head;
tail = tty->read_tail;
nr = (head - tail) & (N_TTY_BUF_SIZE-1);
/* Skip EOF-chars.. */
while (head != tail) {
if (test_bit(tail, tty->read_flags) &&
tty->read_buf[tail] == __DISABLED_CHAR)
nr--;
tail = (tail+1) & (N_TTY_BUF_SIZE-1);
}
return nr;
}
#ifdef TIOCGETP
/*
* These are deprecated, but there is limited support..
*
* The "sg_flags" translation is a joke..
*/
static int get_sgflags(struct tty_struct * tty)
{
int flags = 0;
if (!(tty->termios->c_lflag & ICANON)) {
if (tty->termios->c_lflag & ISIG)
flags |= 0x02; /* cbreak */
else
flags |= 0x20; /* raw */
}
if (tty->termios->c_lflag & ECHO)
flags |= 0x08; /* echo */
if (tty->termios->c_oflag & OPOST)
if (tty->termios->c_oflag & ONLCR)
flags |= 0x10; /* crmod */
return flags;
}
static int get_sgttyb(struct tty_struct * tty, struct sgttyb __user * sgttyb)
{
struct sgttyb tmp;
mutex_lock(&tty->termios_mutex);
tmp.sg_ispeed = tty->termios->c_ispeed;
tmp.sg_ospeed = tty->termios->c_ospeed;
tmp.sg_erase = tty->termios->c_cc[VERASE];
tmp.sg_kill = tty->termios->c_cc[VKILL];
tmp.sg_flags = get_sgflags(tty);
mutex_unlock(&tty->termios_mutex);
return copy_to_user(sgttyb, &tmp, sizeof(tmp)) ? -EFAULT : 0;
}
static void set_sgflags(struct ktermios * termios, int flags)
{
termios->c_iflag = ICRNL | IXON;
termios->c_oflag = 0;
termios->c_lflag = ISIG | ICANON;
if (flags & 0x02) { /* cbreak */
termios->c_iflag = 0;
termios->c_lflag &= ~ICANON;
}
if (flags & 0x08) { /* echo */
termios->c_lflag |= ECHO | ECHOE | ECHOK |
ECHOCTL | ECHOKE | IEXTEN;
}
if (flags & 0x10) { /* crmod */
termios->c_oflag |= OPOST | ONLCR;
}
if (flags & 0x20) { /* raw */
termios->c_iflag = 0;
termios->c_lflag &= ~(ISIG | ICANON);
}
if (!(termios->c_lflag & ICANON)) {
termios->c_cc[VMIN] = 1;
termios->c_cc[VTIME] = 0;
}
}
/**
* set_sgttyb - set legacy terminal values
* @tty: tty structure
* @sgttyb: pointer to old style terminal structure
*
* Updates a terminal from the legacy BSD style terminal information
* structure.
*
* Locking: termios_sem
*/
static int set_sgttyb(struct tty_struct * tty, struct sgttyb __user * sgttyb)
{
int retval;
struct sgttyb tmp;
struct ktermios termios;
retval = tty_check_change(tty);
if (retval)
return retval;
if (copy_from_user(&tmp, sgttyb, sizeof(tmp)))
return -EFAULT;
mutex_lock(&tty->termios_mutex);
termios = *tty->termios;
termios.c_cc[VERASE] = tmp.sg_erase;
termios.c_cc[VKILL] = tmp.sg_kill;
set_sgflags(&termios, tmp.sg_flags);
/* Try and encode into Bfoo format */
#ifdef BOTHER
tty_termios_encode_baud_rate(&termios, termios.c_ispeed, termios.c_ospeed);
#endif
mutex_unlock(&tty->termios_mutex);
change_termios(tty, &termios);
return 0;
}
#endif
#ifdef TIOCGETC
static int get_tchars(struct tty_struct * tty, struct tchars __user * tchars)
{
struct tchars tmp;
tmp.t_intrc = tty->termios->c_cc[VINTR];
tmp.t_quitc = tty->termios->c_cc[VQUIT];
tmp.t_startc = tty->termios->c_cc[VSTART];
tmp.t_stopc = tty->termios->c_cc[VSTOP];
tmp.t_eofc = tty->termios->c_cc[VEOF];
tmp.t_brkc = tty->termios->c_cc[VEOL2]; /* what is brkc anyway? */
return copy_to_user(tchars, &tmp, sizeof(tmp)) ? -EFAULT : 0;
}
static int set_tchars(struct tty_struct * tty, struct tchars __user * tchars)
{
struct tchars tmp;
if (copy_from_user(&tmp, tchars, sizeof(tmp)))
return -EFAULT;
tty->termios->c_cc[VINTR] = tmp.t_intrc;
tty->termios->c_cc[VQUIT] = tmp.t_quitc;
tty->termios->c_cc[VSTART] = tmp.t_startc;
tty->termios->c_cc[VSTOP] = tmp.t_stopc;
tty->termios->c_cc[VEOF] = tmp.t_eofc;
tty->termios->c_cc[VEOL2] = tmp.t_brkc; /* what is brkc anyway? */
return 0;
}
#endif
#ifdef TIOCGLTC
static int get_ltchars(struct tty_struct * tty, struct ltchars __user * ltchars)
{
struct ltchars tmp;
tmp.t_suspc = tty->termios->c_cc[VSUSP];
tmp.t_dsuspc = tty->termios->c_cc[VSUSP]; /* what is dsuspc anyway? */
tmp.t_rprntc = tty->termios->c_cc[VREPRINT];
tmp.t_flushc = tty->termios->c_cc[VEOL2]; /* what is flushc anyway? */
tmp.t_werasc = tty->termios->c_cc[VWERASE];
tmp.t_lnextc = tty->termios->c_cc[VLNEXT];
return copy_to_user(ltchars, &tmp, sizeof(tmp)) ? -EFAULT : 0;
}
static int set_ltchars(struct tty_struct * tty, struct ltchars __user * ltchars)
{
struct ltchars tmp;
if (copy_from_user(&tmp, ltchars, sizeof(tmp)))
return -EFAULT;
tty->termios->c_cc[VSUSP] = tmp.t_suspc;
tty->termios->c_cc[VEOL2] = tmp.t_dsuspc; /* what is dsuspc anyway? */
tty->termios->c_cc[VREPRINT] = tmp.t_rprntc;
tty->termios->c_cc[VEOL2] = tmp.t_flushc; /* what is flushc anyway? */
tty->termios->c_cc[VWERASE] = tmp.t_werasc;
tty->termios->c_cc[VLNEXT] = tmp.t_lnextc;
return 0;
}
#endif
/**
* send_prio_char - send priority character
*
* Send a high priority character to the tty even if stopped
*
* Locking: none for xchar method, write ordering for write method.
*/
static int send_prio_char(struct tty_struct *tty, char ch)
{
int was_stopped = tty->stopped;
if (tty->driver->send_xchar) {
tty->driver->send_xchar(tty, ch);
return 0;
}
if (mutex_lock_interruptible(&tty->atomic_write_lock))
return -ERESTARTSYS;
if (was_stopped)
start_tty(tty);
tty->driver->write(tty, &ch, 1);
if (was_stopped)
stop_tty(tty);
mutex_unlock(&tty->atomic_write_lock);
return 0;
}
int n_tty_ioctl(struct tty_struct * tty, struct file * file,
unsigned int cmd, unsigned long arg)
{
struct tty_struct * real_tty;
void __user *p = (void __user *)arg;
int retval;
struct tty_ldisc *ld;
if (tty->driver->type == TTY_DRIVER_TYPE_PTY &&
tty->driver->subtype == PTY_TYPE_MASTER)
real_tty = tty->link;
else
real_tty = tty;
switch (cmd) {
#ifdef TIOCGETP
case TIOCGETP:
return get_sgttyb(real_tty, (struct sgttyb __user *) arg);
case TIOCSETP:
case TIOCSETN:
return set_sgttyb(real_tty, (struct sgttyb __user *) arg);
#endif
#ifdef TIOCGETC
case TIOCGETC:
return get_tchars(real_tty, p);
case TIOCSETC:
return set_tchars(real_tty, p);
#endif
#ifdef TIOCGLTC
case TIOCGLTC:
return get_ltchars(real_tty, p);
case TIOCSLTC:
return set_ltchars(real_tty, p);
#endif
case TCSETSF:
return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT | TERMIOS_OLD);
case TCSETSW:
return set_termios(real_tty, p, TERMIOS_WAIT | TERMIOS_OLD);
case TCSETS:
return set_termios(real_tty, p, TERMIOS_OLD);
#ifndef TCGETS2
case TCGETS:
if (kernel_termios_to_user_termios((struct termios __user *)arg, real_tty->termios))
return -EFAULT;
return 0;
#else
case TCGETS:
if (kernel_termios_to_user_termios_1((struct termios __user *)arg, real_tty->termios))
return -EFAULT;
return 0;
case TCGETS2:
if (kernel_termios_to_user_termios((struct termios2 __user *)arg, real_tty->termios))
return -EFAULT;
return 0;
case TCSETSF2:
return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT);
case TCSETSW2:
return set_termios(real_tty, p, TERMIOS_WAIT);
case TCSETS2:
return set_termios(real_tty, p, 0);
#endif
case TCGETA:
return get_termio(real_tty, p);
case TCSETAF:
return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT | TERMIOS_TERMIO);
case TCSETAW:
return set_termios(real_tty, p, TERMIOS_WAIT | TERMIOS_TERMIO);
case TCSETA:
return set_termios(real_tty, p, TERMIOS_TERMIO);
case TCXONC:
retval = tty_check_change(tty);
if (retval)
return retval;
switch (arg) {
case TCOOFF:
if (!tty->flow_stopped) {
tty->flow_stopped = 1;
stop_tty(tty);
}
break;
case TCOON:
if (tty->flow_stopped) {
tty->flow_stopped = 0;
start_tty(tty);
}
break;
case TCIOFF:
if (STOP_CHAR(tty) != __DISABLED_CHAR)
return send_prio_char(tty, STOP_CHAR(tty));
break;
case TCION:
if (START_CHAR(tty) != __DISABLED_CHAR)
return send_prio_char(tty, START_CHAR(tty));
break;
default:
return -EINVAL;
}
return 0;
case TCFLSH:
retval = tty_check_change(tty);
if (retval)
return retval;
ld = tty_ldisc_ref(tty);
switch (arg) {
case TCIFLUSH:
if (ld && ld->flush_buffer)
ld->flush_buffer(tty);
break;
case TCIOFLUSH:
if (ld && ld->flush_buffer)
ld->flush_buffer(tty);
/* fall through */
case TCOFLUSH:
if (tty->driver->flush_buffer)
tty->driver->flush_buffer(tty);
break;
default:
tty_ldisc_deref(ld);
return -EINVAL;
}
tty_ldisc_deref(ld);
return 0;
case TIOCOUTQ:
return put_user(tty->driver->chars_in_buffer ?
tty->driver->chars_in_buffer(tty) : 0,
(int __user *) arg);
case TIOCINQ:
retval = tty->read_cnt;
if (L_ICANON(tty))
retval = inq_canon(tty);
return put_user(retval, (unsigned int __user *) arg);
case TIOCGLCKTRMIOS:
if (kernel_termios_to_user_termios((struct termios __user *)arg, real_tty->termios_locked))
return -EFAULT;
return 0;
case TIOCSLCKTRMIOS:
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (user_termios_to_kernel_termios(real_tty->termios_locked, (struct termios __user *) arg))
return -EFAULT;
return 0;
case TIOCPKT:
{
int pktmode;
if (tty->driver->type != TTY_DRIVER_TYPE_PTY ||
tty->driver->subtype != PTY_TYPE_MASTER)
return -ENOTTY;
if (get_user(pktmode, (int __user *) arg))
return -EFAULT;
if (pktmode) {
if (!tty->packet) {
tty->packet = 1;
tty->link->ctrl_status = 0;
}
} else
tty->packet = 0;
return 0;
}
case TIOCGSOFTCAR:
return put_user(C_CLOCAL(tty) ? 1 : 0, (int __user *)arg);
case TIOCSSOFTCAR:
if (get_user(arg, (unsigned int __user *) arg))
return -EFAULT;
mutex_lock(&tty->termios_mutex);
tty->termios->c_cflag =
((tty->termios->c_cflag & ~CLOCAL) |
(arg ? CLOCAL : 0));
mutex_unlock(&tty->termios_mutex);
return 0;
default:
return -ENOIOCTLCMD;
}
}
EXPORT_SYMBOL(n_tty_ioctl);
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