diff options
Diffstat (limited to 'drivers/char/tty_ioctl.c')
| -rw-r--r-- | drivers/char/tty_ioctl.c | 606 |
1 files changed, 0 insertions, 606 deletions
diff --git a/drivers/char/tty_ioctl.c b/drivers/char/tty_ioctl.c deleted file mode 100644 index 4ad47d321bd..00000000000 --- a/drivers/char/tty_ioctl.c +++ /dev/null @@ -1,606 +0,0 @@ -/* - * 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 <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 - - -/** - * 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 termios *termios, - struct termios *old, - struct termios *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]; -} - -/** - * 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 termios * new_termios) -{ - int canon_change; - struct termios 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 */ - down(&tty->termios_sem); - - *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); - } - up(&tty->termios_sem); -} - -/** - * 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 termios tmp_termios; - struct tty_ldisc *ld; - int retval = tty_check_change(tty); - - if (retval) - return retval; - - if (opt & TERMIOS_TERMIO) { - memcpy(&tmp_termios, tty->termios, sizeof(struct termios)); - if (user_termio_to_kernel_termios(&tmp_termios, - (struct termio __user *)arg)) - return -EFAULT; - } else { - if (user_termios_to_kernel_termios(&tmp_termios, - (struct termios __user *)arg)) - return -EFAULT; - } - - 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; - - down(&tty->termios_sem); - 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); - up(&tty->termios_sem); - - return copy_to_user(sgttyb, &tmp, sizeof(tmp)) ? -EFAULT : 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; - } -} - -/** - * 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 termios termios; - - retval = tty_check_change(tty); - if (retval) - return retval; - - if (copy_from_user(&tmp, sgttyb, sizeof(tmp))) - return -EFAULT; - - down(&tty->termios_sem); - termios = *tty->termios; - termios.c_cc[VERASE] = tmp.sg_erase; - termios.c_cc[VKILL] = tmp.sg_kill; - set_sgflags(&termios, tmp.sg_flags); - up(&tty->termios_sem); - 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 - * - * FIXME: overlapping calls with start/stop tty lose state of tty - */ - -static void 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; - } - if (was_stopped) - start_tty(tty); - tty->driver->write(tty, &ch, 1); - if (was_stopped) - stop_tty(tty); -} - -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 TCGETS: - if (kernel_termios_to_user_termios((struct termios __user *)arg, real_tty->termios)) - return -EFAULT; - return 0; - case TCSETSF: - return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT); - case TCSETSW: - return set_termios(real_tty, p, TERMIOS_WAIT); - case TCSETS: - return set_termios(real_tty, p, 0); - 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) - send_prio_char(tty, STOP_CHAR(tty)); - break; - case TCION: - if (START_CHAR(tty) != __DISABLED_CHAR) - 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; - down(&tty->termios_sem); - tty->termios->c_cflag = - ((tty->termios->c_cflag & ~CLOCAL) | - (arg ? CLOCAL : 0)); - up(&tty->termios_sem); - return 0; - default: - return -ENOIOCTLCMD; - } -} - -EXPORT_SYMBOL(n_tty_ioctl); |