/*
* 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 <asm/io.h>
#include <asm/bitops.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#undef TTY_DEBUG_WAIT_UNTIL_SENT
#undef DEBUG
#ifdef DEBUG
# define PRINTK(x) printk (x)
#else
# define PRINTK(x) /**/
#endif
/*
* Internal flag options for termios setting behavior
*/
#define TERMIOS_FLUSH 1
#define TERMIOS_WAIT 2
#define TERMIOS_TERMIO 4
43 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("%s wait until sent...\n", tty_name(tty, buf));
#endif
52 if (!tty->driver.chars_in_buffer)
53 return;
add_wait_queue(&tty->write_wait, &wait);
55 if (!timeout)
timeout = MAX_SCHEDULE_TIMEOUT;
57 do {
#ifdef TTY_DEBUG_WAIT_UNTIL_SENT
printk("waiting %s...(%d)\n", tty_name(tty, buf),
tty->driver.chars_in_buffer(tty));
#endif
62 set_current_state(TASK_INTERRUPTIBLE);
63 if (signal_pending(current))
64 goto stop_waiting;
65 if (!tty->driver.chars_in_buffer(tty))
66 break;
timeout = schedule_timeout(timeout);
68 } while (timeout);
69 if (tty->driver.wait_until_sent)
tty->driver.wait_until_sent(tty, timeout);
stop_waiting:
current->state = TASK_RUNNING;
remove_wait_queue(&tty->write_wait, &wait);
}
76 static void unset_locked_termios(struct termios *termios,
struct termios *old,
struct termios *locked)
{
int i;
#define NOSET_MASK(x,y,z) (x = ((x) & ~(z)) | ((y) & (z)))
84 if (!locked) {
printk("Warning?!? termios_locked is NULL.\n");
86 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;
94 for (i=0; i < NCCS; i++)
termios->c_cc[i] = locked->c_cc[i] ?
old->c_cc[i] : termios->c_cc[i];
}
99 static void change_termios(struct tty_struct * tty, struct termios * new_termios)
{
int canon_change;
struct termios old_termios = *tty->termios;
cli();
*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;
108 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;
}
sti();
115 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 */
121 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');
128 if (old_flow != new_flow) {
tty->ctrl_status &= ~(TIOCPKT_DOSTOP | TIOCPKT_NOSTOP);
130 if (new_flow)
tty->ctrl_status |= TIOCPKT_DOSTOP;
132 else
tty->ctrl_status |= TIOCPKT_NOSTOP;
wake_up_interruptible(&tty->link->read_wait);
}
}
138 if (tty->driver.set_termios)
(*tty->driver.set_termios)(tty, &old_termios);
141 if (tty->ldisc.set_termios)
(*tty->ldisc.set_termios)(tty, &old_termios);
}
145 static int set_termios(struct tty_struct * tty, unsigned long arg, int opt)
{
struct termios tmp_termios;
int retval;
retval = tty_check_change(tty);
151 if (retval)
152 return retval;
154 if (opt & TERMIOS_TERMIO) {
memcpy(&tmp_termios, tty->termios, sizeof(struct termios));
156 if (user_termio_to_kernel_termios(&tmp_termios, (struct termio *) arg))
157 return -EFAULT;
158 } else {
159 if (user_termios_to_kernel_termios(&tmp_termios, (struct termios *) arg))
160 return -EFAULT;
}
163 if ((opt & TERMIOS_FLUSH) && tty->ldisc.flush_buffer)
tty->ldisc.flush_buffer(tty);
166 if (opt & TERMIOS_WAIT) {
tty_wait_until_sent(tty, 0);
168 if (signal_pending(current))
169 return -EINTR;
}
change_termios(tty, &tmp_termios);
173 return 0;
}
176 static int get_termio(struct tty_struct * tty, struct termio * termio)
{
178 if (kernel_termios_to_user_termio(termio, tty->termios))
179 return -EFAULT;
180 return 0;
}
183 static unsigned long inq_canon(struct tty_struct * tty)
{
int nr, head, tail;
187 if (!tty->canon_data || !tty->read_buf)
188 return 0;
head = tty->canon_head;
tail = tty->read_tail;
nr = (head - tail) & (N_TTY_BUF_SIZE-1);
/* Skip EOF-chars.. */
193 while (head != tail) {
if (test_bit(tail, &tty->read_flags) &&
195 tty->read_buf[tail] == __DISABLED_CHAR)
nr--;
tail = (tail+1) & (N_TTY_BUF_SIZE-1);
}
199 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 * sgttyb)
{
struct sgttyb tmp;
tmp.sg_ispeed = 0;
tmp.sg_ospeed = 0;
tmp.sg_erase = tty->termios->c_cc[VERASE];
tmp.sg_kill = tty->termios->c_cc[VKILL];
tmp.sg_flags = get_sgflags(tty);
if (copy_to_user(sgttyb, &tmp, sizeof(tmp)))
return -EFAULT;
return 0;
}
static void set_sgflags(struct termios * 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;
}
}
static int set_sgttyb(struct tty_struct * tty, struct sgttyb * sgttyb)
{
int retval;
struct sgttyb tmp;
struct termios termios;
retval = tty_check_change(tty);
if (retval)
return retval;
termios = *tty->termios;
if (copy_from_user(&tmp, sgttyb, sizeof(tmp)))
return -EFAULT;
termios.c_cc[VERASE] = tmp.sg_erase;
termios.c_cc[VKILL] = tmp.sg_kill;
set_sgflags(&termios, tmp.sg_flags);
change_termios(tty, &termios);
return 0;
}
#endif
#ifdef TIOCGETC
static int get_tchars(struct tty_struct * tty, struct tchars * 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? */
if (copy_to_user(tchars, &tmp, sizeof(tmp)))
return -EFAULT;
return 0;
}
static int set_tchars(struct tty_struct * tty, struct tchars * 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 * 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];
if (copy_to_user(ltchars, &tmp, sizeof(tmp)))
return -EFAULT;
return 0;
}
static int set_ltchars(struct tty_struct * tty, struct ltchars * 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 a high priority character to the tty.
*/
353 void send_prio_char(struct tty_struct *tty, char ch)
{
int was_stopped = tty->stopped;
357 if (tty->driver.send_xchar) {
tty->driver.send_xchar(tty, ch);
359 return;
}
361 if (was_stopped)
start_tty(tty);
tty->driver.write(tty, 0, &ch, 1);
364 if (was_stopped)
stop_tty(tty);
}
368 int n_tty_ioctl(struct tty_struct * tty, struct file * file,
unsigned int cmd, unsigned long arg)
{
struct tty_struct * real_tty;
int retval;
if (tty->driver.type == TTY_DRIVER_TYPE_PTY &&
375 tty->driver.subtype == PTY_TYPE_MASTER)
real_tty = tty->link;
377 else
real_tty = tty;
380 switch (cmd) {
#ifdef TIOCGETP
case TIOCGETP:
return get_sgttyb(real_tty, (struct sgttyb *) arg);
case TIOCSETP:
case TIOCSETN:
return set_sgttyb(real_tty, (struct sgttyb *) arg);
#endif
#ifdef TIOCGETC
case TIOCGETC:
return get_tchars(real_tty, (struct tchars *) arg);
case TIOCSETC:
return set_tchars(real_tty, (struct tchars *) arg);
#endif
#ifdef TIOCGLTC
case TIOCGLTC:
return get_ltchars(real_tty, (struct ltchars *) arg);
case TIOCSLTC:
return set_ltchars(real_tty, (struct ltchars *) arg);
#endif
400 case TCGETS:
401 if (kernel_termios_to_user_termios((struct termios *)arg, real_tty->termios))
402 return -EFAULT;
403 return 0;
404 case TCSETSF:
405 return set_termios(real_tty, arg, TERMIOS_FLUSH);
406 case TCSETSW:
407 return set_termios(real_tty, arg, TERMIOS_WAIT);
408 case TCSETS:
409 return set_termios(real_tty, arg, 0);
410 case TCGETA:
411 return get_termio(real_tty,(struct termio *) arg);
412 case TCSETAF:
413 return set_termios(real_tty, arg, TERMIOS_FLUSH | TERMIOS_TERMIO);
414 case TCSETAW:
415 return set_termios(real_tty, arg, TERMIOS_WAIT | TERMIOS_TERMIO);
416 case TCSETA:
417 return set_termios(real_tty, arg, TERMIOS_TERMIO);
418 case TCXONC:
retval = tty_check_change(tty);
420 if (retval)
421 return retval;
422 switch (arg) {
423 case TCOOFF:
424 if (!tty->flow_stopped) {
tty->flow_stopped = 1;
stop_tty(tty);
}
428 break;
429 case TCOON:
430 if (tty->flow_stopped) {
tty->flow_stopped = 0;
start_tty(tty);
}
434 break;
435 case TCIOFF:
436 if (STOP_CHAR(tty) != __DISABLED_CHAR)
send_prio_char(tty, STOP_CHAR(tty));
438 break;
439 case TCION:
440 if (START_CHAR(tty) != __DISABLED_CHAR)
send_prio_char(tty, START_CHAR(tty));
442 break;
443 default:
444 return -EINVAL;
}
446 return 0;
447 case TCFLSH:
retval = tty_check_change(tty);
449 if (retval)
450 return retval;
451 switch (arg) {
452 case TCIFLUSH:
453 if (tty->ldisc.flush_buffer)
tty->ldisc.flush_buffer(tty);
455 break;
456 case TCIOFLUSH:
457 if (tty->ldisc.flush_buffer)
tty->ldisc.flush_buffer(tty);
/* fall through */
460 case TCOFLUSH:
461 if (tty->driver.flush_buffer)
tty->driver.flush_buffer(tty);
463 break;
464 default:
465 return -EINVAL;
}
467 return 0;
468 case TIOCOUTQ:
return put_user(tty->driver.chars_in_buffer ?
tty->driver.chars_in_buffer(tty) : 0,
471 (int *) arg);
472 case TIOCINQ:
retval = tty->read_cnt;
474 if (L_ICANON(tty))
retval = inq_canon(tty);
476 return put_user(retval, (unsigned int *) arg);
477 case TIOCGLCKTRMIOS:
478 if (kernel_termios_to_user_termios((struct termios *)arg, real_tty->termios_locked))
479 return -EFAULT;
480 return 0;
482 case TIOCSLCKTRMIOS:
483 if (!suser())
484 return -EPERM;
485 if (user_termios_to_kernel_termios(real_tty->termios_locked, (struct termios *) arg))
486 return -EFAULT;
487 return 0;
489 case TIOCPKT:
{
int pktmode;
if (tty->driver.type != TTY_DRIVER_TYPE_PTY ||
494 tty->driver.subtype != PTY_TYPE_MASTER)
495 return -ENOTTY;
retval = get_user(pktmode, (int *) arg);
497 if (retval)
498 return retval;
499 if (pktmode) {
500 if (!tty->packet) {
tty->packet = 1;
tty->link->ctrl_status = 0;
}
504 } else
tty->packet = 0;
506 return 0;
}
508 case TIOCGSOFTCAR:
509 return put_user(C_CLOCAL(tty) ? 1 : 0, (int *) arg);
510 case TIOCSSOFTCAR:
retval = get_user(arg, (unsigned int *) arg);
512 if (retval)
513 return retval;
tty->termios->c_cflag =
((tty->termios->c_cflag & ~CLOCAL) |
(arg ? CLOCAL : 0));
517 return 0;
518 default:
519 return -ENOIOCTLCMD;
}
}