![Alan Cox](/assets/img/avatar_default.png)
Something Arjan suggested which allows us to clean up the code nicely Signed-off-by: Alan Cox <alan@redhat.com> Cc: Arjan van de Ven <arjan@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1059 lines
27 KiB
C
1059 lines
27 KiB
C
/*
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* linux/drivers/char/tty_ioctl.c
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*
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* Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
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*
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* Modified by Fred N. van Kempen, 01/29/93, to add line disciplines
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* which can be dynamically activated and de-activated by the line
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* discipline handling modules (like SLIP).
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*/
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#include <linux/types.h>
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#include <linux/termios.h>
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/major.h>
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#include <linux/tty.h>
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#include <linux/fcntl.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/bitops.h>
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#include <linux/mutex.h>
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#include <linux/smp_lock.h>
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#include <asm/io.h>
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#include <asm/uaccess.h>
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#include <asm/system.h>
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#undef TTY_DEBUG_WAIT_UNTIL_SENT
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#undef DEBUG
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/*
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* Internal flag options for termios setting behavior
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*/
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#define TERMIOS_FLUSH 1
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#define TERMIOS_WAIT 2
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#define TERMIOS_TERMIO 4
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#define TERMIOS_OLD 8
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int tty_chars_in_buffer(struct tty_struct *tty)
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{
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if (tty->ops->chars_in_buffer)
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return tty->ops->chars_in_buffer(tty);
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else
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return 0;
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}
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EXPORT_SYMBOL(tty_chars_in_buffer);
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int tty_write_room(struct tty_struct *tty)
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{
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if (tty->ops->write_room)
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return tty->ops->write_room(tty);
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return 2048;
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}
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EXPORT_SYMBOL(tty_write_room);
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void tty_driver_flush_buffer(struct tty_struct *tty)
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{
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if (tty->ops->flush_buffer)
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tty->ops->flush_buffer(tty);
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}
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EXPORT_SYMBOL(tty_driver_flush_buffer);
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void tty_throttle(struct tty_struct *tty)
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{
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/* check TTY_THROTTLED first so it indicates our state */
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if (!test_and_set_bit(TTY_THROTTLED, &tty->flags) &&
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tty->ops->throttle)
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tty->ops->throttle(tty);
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}
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EXPORT_SYMBOL(tty_throttle);
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void tty_unthrottle(struct tty_struct *tty)
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{
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if (test_and_clear_bit(TTY_THROTTLED, &tty->flags) &&
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tty->ops->unthrottle)
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tty->ops->unthrottle(tty);
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}
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EXPORT_SYMBOL(tty_unthrottle);
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/**
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* tty_wait_until_sent - wait for I/O to finish
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* @tty: tty we are waiting for
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* @timeout: how long we will wait
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*
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* Wait for characters pending in a tty driver to hit the wire, or
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* for a timeout to occur (eg due to flow control)
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*
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* Locking: none
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*/
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void tty_wait_until_sent(struct tty_struct *tty, long timeout)
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{
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#ifdef TTY_DEBUG_WAIT_UNTIL_SENT
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char buf[64];
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printk(KERN_DEBUG "%s wait until sent...\n", tty_name(tty, buf));
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#endif
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if (!timeout)
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timeout = MAX_SCHEDULE_TIMEOUT;
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if (wait_event_interruptible_timeout(tty->write_wait,
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!tty_chars_in_buffer(tty), timeout) >= 0) {
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if (tty->ops->wait_until_sent)
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tty->ops->wait_until_sent(tty, timeout);
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}
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}
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EXPORT_SYMBOL(tty_wait_until_sent);
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static void unset_locked_termios(struct ktermios *termios,
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struct ktermios *old,
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struct ktermios *locked)
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{
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int i;
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#define NOSET_MASK(x, y, z) (x = ((x) & ~(z)) | ((y) & (z)))
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if (!locked) {
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printk(KERN_WARNING "Warning?!? termios_locked is NULL.\n");
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return;
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}
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NOSET_MASK(termios->c_iflag, old->c_iflag, locked->c_iflag);
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NOSET_MASK(termios->c_oflag, old->c_oflag, locked->c_oflag);
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NOSET_MASK(termios->c_cflag, old->c_cflag, locked->c_cflag);
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NOSET_MASK(termios->c_lflag, old->c_lflag, locked->c_lflag);
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termios->c_line = locked->c_line ? old->c_line : termios->c_line;
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for (i = 0; i < NCCS; i++)
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termios->c_cc[i] = locked->c_cc[i] ?
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old->c_cc[i] : termios->c_cc[i];
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/* FIXME: What should we do for i/ospeed */
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}
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/*
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* Routine which returns the baud rate of the tty
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*
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* Note that the baud_table needs to be kept in sync with the
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* include/asm/termbits.h file.
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*/
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static const speed_t baud_table[] = {
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0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
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9600, 19200, 38400, 57600, 115200, 230400, 460800,
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#ifdef __sparc__
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76800, 153600, 307200, 614400, 921600
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#else
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500000, 576000, 921600, 1000000, 1152000, 1500000, 2000000,
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2500000, 3000000, 3500000, 4000000
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#endif
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};
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#ifndef __sparc__
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static const tcflag_t baud_bits[] = {
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B0, B50, B75, B110, B134, B150, B200, B300, B600,
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B1200, B1800, B2400, B4800, B9600, B19200, B38400,
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B57600, B115200, B230400, B460800, B500000, B576000,
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B921600, B1000000, B1152000, B1500000, B2000000, B2500000,
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B3000000, B3500000, B4000000
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};
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#else
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static const tcflag_t baud_bits[] = {
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B0, B50, B75, B110, B134, B150, B200, B300, B600,
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B1200, B1800, B2400, B4800, B9600, B19200, B38400,
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B57600, B115200, B230400, B460800, B76800, B153600,
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B307200, B614400, B921600
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};
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#endif
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static int n_baud_table = ARRAY_SIZE(baud_table);
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/**
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* tty_termios_baud_rate
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* @termios: termios structure
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*
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* Convert termios baud rate data into a speed. This should be called
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* with the termios lock held if this termios is a terminal termios
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* structure. May change the termios data. Device drivers can call this
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* function but should use ->c_[io]speed directly as they are updated.
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*
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* Locking: none
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*/
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speed_t tty_termios_baud_rate(struct ktermios *termios)
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{
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unsigned int cbaud;
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cbaud = termios->c_cflag & CBAUD;
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#ifdef BOTHER
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/* Magic token for arbitary speed via c_ispeed/c_ospeed */
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if (cbaud == BOTHER)
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return termios->c_ospeed;
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#endif
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if (cbaud & CBAUDEX) {
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cbaud &= ~CBAUDEX;
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if (cbaud < 1 || cbaud + 15 > n_baud_table)
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termios->c_cflag &= ~CBAUDEX;
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else
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cbaud += 15;
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}
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return baud_table[cbaud];
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}
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EXPORT_SYMBOL(tty_termios_baud_rate);
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/**
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* tty_termios_input_baud_rate
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* @termios: termios structure
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*
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* Convert termios baud rate data into a speed. This should be called
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* with the termios lock held if this termios is a terminal termios
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* structure. May change the termios data. Device drivers can call this
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* function but should use ->c_[io]speed directly as they are updated.
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*
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* Locking: none
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*/
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speed_t tty_termios_input_baud_rate(struct ktermios *termios)
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{
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#ifdef IBSHIFT
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unsigned int cbaud = (termios->c_cflag >> IBSHIFT) & CBAUD;
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if (cbaud == B0)
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return tty_termios_baud_rate(termios);
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/* Magic token for arbitary speed via c_ispeed*/
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if (cbaud == BOTHER)
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return termios->c_ispeed;
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if (cbaud & CBAUDEX) {
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cbaud &= ~CBAUDEX;
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if (cbaud < 1 || cbaud + 15 > n_baud_table)
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termios->c_cflag &= ~(CBAUDEX << IBSHIFT);
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else
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cbaud += 15;
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}
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return baud_table[cbaud];
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#else
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return tty_termios_baud_rate(termios);
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#endif
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}
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EXPORT_SYMBOL(tty_termios_input_baud_rate);
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/**
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* tty_termios_encode_baud_rate
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* @termios: ktermios structure holding user requested state
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* @ispeed: input speed
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* @ospeed: output speed
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*
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* Encode the speeds set into the passed termios structure. This is
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* used as a library helper for drivers os that they can report back
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* the actual speed selected when it differs from the speed requested
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*
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* For maximal back compatibility with legacy SYS5/POSIX *nix behaviour
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* we need to carefully set the bits when the user does not get the
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* desired speed. We allow small margins and preserve as much of possible
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* of the input intent to keep compatiblity.
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*
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* Locking: Caller should hold termios lock. This is already held
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* when calling this function from the driver termios handler.
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*
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* The ifdefs deal with platforms whose owners have yet to update them
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* and will all go away once this is done.
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*/
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void tty_termios_encode_baud_rate(struct ktermios *termios,
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speed_t ibaud, speed_t obaud)
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{
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int i = 0;
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int ifound = -1, ofound = -1;
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int iclose = ibaud/50, oclose = obaud/50;
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int ibinput = 0;
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if (obaud == 0) /* CD dropped */
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ibaud = 0; /* Clear ibaud to be sure */
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termios->c_ispeed = ibaud;
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termios->c_ospeed = obaud;
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#ifdef BOTHER
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/* If the user asked for a precise weird speed give a precise weird
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answer. If they asked for a Bfoo speed they many have problems
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digesting non-exact replies so fuzz a bit */
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if ((termios->c_cflag & CBAUD) == BOTHER)
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oclose = 0;
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if (((termios->c_cflag >> IBSHIFT) & CBAUD) == BOTHER)
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iclose = 0;
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if ((termios->c_cflag >> IBSHIFT) & CBAUD)
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ibinput = 1; /* An input speed was specified */
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#endif
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termios->c_cflag &= ~CBAUD;
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/*
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* Our goal is to find a close match to the standard baud rate
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* returned. Walk the baud rate table and if we get a very close
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* match then report back the speed as a POSIX Bxxxx value by
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* preference
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*/
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do {
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if (obaud - oclose <= baud_table[i] &&
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obaud + oclose >= baud_table[i]) {
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termios->c_cflag |= baud_bits[i];
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ofound = i;
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}
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if (ibaud - iclose <= baud_table[i] &&
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ibaud + iclose >= baud_table[i]) {
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/* For the case input == output don't set IBAUD bits
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if the user didn't do so */
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if (ofound == i && !ibinput)
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ifound = i;
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#ifdef IBSHIFT
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else {
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ifound = i;
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termios->c_cflag |= (baud_bits[i] << IBSHIFT);
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}
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#endif
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}
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} while (++i < n_baud_table);
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/*
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* If we found no match then use BOTHER if provided or warn
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* the user their platform maintainer needs to wake up if not.
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*/
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#ifdef BOTHER
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if (ofound == -1)
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termios->c_cflag |= BOTHER;
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/* Set exact input bits only if the input and output differ or the
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user already did */
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if (ifound == -1 && (ibaud != obaud || ibinput))
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termios->c_cflag |= (BOTHER << IBSHIFT);
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#else
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if (ifound == -1 || ofound == -1) {
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static int warned;
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if (!warned++)
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printk(KERN_WARNING "tty: Unable to return correct "
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"speed data as your architecture needs updating.\n");
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}
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#endif
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}
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EXPORT_SYMBOL_GPL(tty_termios_encode_baud_rate);
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void tty_encode_baud_rate(struct tty_struct *tty, speed_t ibaud, speed_t obaud)
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{
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tty_termios_encode_baud_rate(tty->termios, ibaud, obaud);
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}
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EXPORT_SYMBOL_GPL(tty_encode_baud_rate);
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/**
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* tty_get_baud_rate - get tty bit rates
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* @tty: tty to query
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*
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* Returns the baud rate as an integer for this terminal. The
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* termios lock must be held by the caller and the terminal bit
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* flags may be updated.
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*
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* Locking: none
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*/
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speed_t tty_get_baud_rate(struct tty_struct *tty)
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{
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speed_t baud = tty_termios_baud_rate(tty->termios);
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if (baud == 38400 && tty->alt_speed) {
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if (!tty->warned) {
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printk(KERN_WARNING "Use of setserial/setrocket to "
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"set SPD_* flags is deprecated\n");
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tty->warned = 1;
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}
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baud = tty->alt_speed;
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}
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return baud;
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}
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EXPORT_SYMBOL(tty_get_baud_rate);
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/**
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* tty_termios_copy_hw - copy hardware settings
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* @new: New termios
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* @old: Old termios
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*
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* Propogate the hardware specific terminal setting bits from
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* the old termios structure to the new one. This is used in cases
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* where the hardware does not support reconfiguration or as a helper
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* in some cases where only minimal reconfiguration is supported
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*/
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void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old)
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{
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/* The bits a dumb device handles in software. Smart devices need
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to always provide a set_termios method */
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new->c_cflag &= HUPCL | CREAD | CLOCAL;
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new->c_cflag |= old->c_cflag & ~(HUPCL | CREAD | CLOCAL);
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new->c_ispeed = old->c_ispeed;
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new->c_ospeed = old->c_ospeed;
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}
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EXPORT_SYMBOL(tty_termios_copy_hw);
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/**
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* tty_termios_hw_change - check for setting change
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* @a: termios
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* @b: termios to compare
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*
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* Check if any of the bits that affect a dumb device have changed
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* between the two termios structures, or a speed change is needed.
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*/
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int tty_termios_hw_change(struct ktermios *a, struct ktermios *b)
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{
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if (a->c_ispeed != b->c_ispeed || a->c_ospeed != b->c_ospeed)
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return 1;
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if ((a->c_cflag ^ b->c_cflag) & ~(HUPCL | CREAD | CLOCAL))
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return 1;
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return 0;
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}
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EXPORT_SYMBOL(tty_termios_hw_change);
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/**
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* change_termios - update termios values
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* @tty: tty to update
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* @new_termios: desired new value
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*
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* Perform updates to the termios values set on this terminal. There
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* is a bit of layering violation here with n_tty in terms of the
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* internal knowledge of this function.
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*
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* Locking: termios_sem
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*/
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static void change_termios(struct tty_struct *tty, struct ktermios *new_termios)
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{
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int canon_change;
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struct ktermios old_termios;
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struct tty_ldisc *ld;
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unsigned long flags;
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/*
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* Perform the actual termios internal changes under lock.
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*/
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/* FIXME: we need to decide on some locking/ordering semantics
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for the set_termios notification eventually */
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mutex_lock(&tty->termios_mutex);
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old_termios = *tty->termios;
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*tty->termios = *new_termios;
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unset_locked_termios(tty->termios, &old_termios, tty->termios_locked);
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canon_change = (old_termios.c_lflag ^ tty->termios->c_lflag) & ICANON;
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if (canon_change) {
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memset(&tty->read_flags, 0, sizeof tty->read_flags);
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tty->canon_head = tty->read_tail;
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tty->canon_data = 0;
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tty->erasing = 0;
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}
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/* This bit should be in the ldisc code */
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if (canon_change && !L_ICANON(tty) && tty->read_cnt)
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/* Get characters left over from canonical mode. */
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wake_up_interruptible(&tty->read_wait);
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/* See if packet mode change of state. */
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if (tty->link && tty->link->packet) {
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int old_flow = ((old_termios.c_iflag & IXON) &&
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(old_termios.c_cc[VSTOP] == '\023') &&
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(old_termios.c_cc[VSTART] == '\021'));
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int new_flow = (I_IXON(tty) &&
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STOP_CHAR(tty) == '\023' &&
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START_CHAR(tty) == '\021');
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if (old_flow != new_flow) {
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spin_lock_irqsave(&tty->ctrl_lock, flags);
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tty->ctrl_status &= ~(TIOCPKT_DOSTOP | TIOCPKT_NOSTOP);
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if (new_flow)
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tty->ctrl_status |= TIOCPKT_DOSTOP;
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else
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tty->ctrl_status |= TIOCPKT_NOSTOP;
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spin_unlock_irqrestore(&tty->ctrl_lock, flags);
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wake_up_interruptible(&tty->link->read_wait);
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|
}
|
|
}
|
|
|
|
if (tty->ops->set_termios)
|
|
(*tty->ops->set_termios)(tty, &old_termios);
|
|
else
|
|
tty_termios_copy_hw(tty->termios, &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 necessary 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;
|
|
|
|
mutex_lock(&tty->termios_mutex);
|
|
memcpy(&tmp_termios, tty->termios, sizeof(struct ktermios));
|
|
mutex_unlock(&tty->termios_mutex);
|
|
|
|
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);
|
|
|
|
/* FIXME: Arguably if tmp_termios == tty->termios AND the
|
|
actual requested termios was not tmp_termios then we may
|
|
want to return an error as no user requested change has
|
|
succeeded */
|
|
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;
|
|
|
|
mutex_lock(&tty->termios_mutex);
|
|
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? */
|
|
mutex_unlock(&tty->termios_mutex);
|
|
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;
|
|
mutex_lock(&tty->termios_mutex);
|
|
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? */
|
|
mutex_unlock(&tty->termios_mutex);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#ifdef TIOCGLTC
|
|
static int get_ltchars(struct tty_struct *tty, struct ltchars __user *ltchars)
|
|
{
|
|
struct ltchars tmp;
|
|
|
|
mutex_lock(&tty->termios_mutex);
|
|
tmp.t_suspc = tty->termios->c_cc[VSUSP];
|
|
/* what is dsuspc anyway? */
|
|
tmp.t_dsuspc = tty->termios->c_cc[VSUSP];
|
|
tmp.t_rprntc = tty->termios->c_cc[VREPRINT];
|
|
/* what is flushc anyway? */
|
|
tmp.t_flushc = tty->termios->c_cc[VEOL2];
|
|
tmp.t_werasc = tty->termios->c_cc[VWERASE];
|
|
tmp.t_lnextc = tty->termios->c_cc[VLNEXT];
|
|
mutex_unlock(&tty->termios_mutex);
|
|
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;
|
|
|
|
mutex_lock(&tty->termios_mutex);
|
|
tty->termios->c_cc[VSUSP] = tmp.t_suspc;
|
|
/* what is dsuspc anyway? */
|
|
tty->termios->c_cc[VEOL2] = tmp.t_dsuspc;
|
|
tty->termios->c_cc[VREPRINT] = tmp.t_rprntc;
|
|
/* what is flushc anyway? */
|
|
tty->termios->c_cc[VEOL2] = tmp.t_flushc;
|
|
tty->termios->c_cc[VWERASE] = tmp.t_werasc;
|
|
tty->termios->c_cc[VLNEXT] = tmp.t_lnextc;
|
|
mutex_unlock(&tty->termios_mutex);
|
|
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->ops->send_xchar) {
|
|
tty->ops->send_xchar(tty, ch);
|
|
return 0;
|
|
}
|
|
|
|
if (tty_write_lock(tty, 0) < 0)
|
|
return -ERESTARTSYS;
|
|
|
|
if (was_stopped)
|
|
start_tty(tty);
|
|
tty->ops->write(tty, &ch, 1);
|
|
if (was_stopped)
|
|
stop_tty(tty);
|
|
tty_write_unlock(tty);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* tty_change_softcar - carrier change ioctl helper
|
|
* @tty: tty to update
|
|
* @arg: enable/disable CLOCAL
|
|
*
|
|
* Perform a change to the CLOCAL state and call into the driver
|
|
* layer to make it visible. All done with the termios mutex
|
|
*/
|
|
|
|
static int tty_change_softcar(struct tty_struct *tty, int arg)
|
|
{
|
|
int ret = 0;
|
|
int bit = arg ? CLOCAL : 0;
|
|
struct ktermios old;
|
|
|
|
mutex_lock(&tty->termios_mutex);
|
|
old = *tty->termios;
|
|
tty->termios->c_cflag &= ~CLOCAL;
|
|
tty->termios->c_cflag |= bit;
|
|
if (tty->ops->set_termios)
|
|
tty->ops->set_termios(tty, &old);
|
|
if ((tty->termios->c_cflag & CLOCAL) != bit)
|
|
ret = -EINVAL;
|
|
mutex_unlock(&tty->termios_mutex);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* tty_mode_ioctl - mode related ioctls
|
|
* @tty: tty for the ioctl
|
|
* @file: file pointer for the tty
|
|
* @cmd: command
|
|
* @arg: ioctl argument
|
|
*
|
|
* Perform non line discipline specific mode control ioctls. This
|
|
* is designed to be called by line disciplines to ensure they provide
|
|
* consistent mode setting.
|
|
*/
|
|
|
|
int tty_mode_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;
|
|
|
|
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);
|
|
#ifndef TCGETS2
|
|
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;
|
|
#else
|
|
case TIOCGLCKTRMIOS:
|
|
if (kernel_termios_to_user_termios_1((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_1(real_tty->termios_locked,
|
|
(struct termios __user *) arg))
|
|
return -EFAULT;
|
|
return 0;
|
|
#endif
|
|
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;
|
|
return tty_change_softcar(tty, arg);
|
|
default:
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(tty_mode_ioctl);
|
|
|
|
int tty_perform_flush(struct tty_struct *tty, unsigned long arg)
|
|
{
|
|
struct tty_ldisc *ld;
|
|
int 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:
|
|
tty_driver_flush_buffer(tty);
|
|
break;
|
|
default:
|
|
tty_ldisc_deref(ld);
|
|
return -EINVAL;
|
|
}
|
|
tty_ldisc_deref(ld);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tty_perform_flush);
|
|
|
|
int n_tty_ioctl(struct tty_struct *tty, struct file *file,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct tty_struct *real_tty;
|
|
unsigned long flags;
|
|
int retval;
|
|
|
|
if (tty->driver->type == TTY_DRIVER_TYPE_PTY &&
|
|
tty->driver->subtype == PTY_TYPE_MASTER)
|
|
real_tty = tty->link;
|
|
else
|
|
real_tty = tty;
|
|
|
|
switch (cmd) {
|
|
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:
|
|
return tty_perform_flush(tty, arg);
|
|
case TIOCOUTQ:
|
|
return put_user(tty_chars_in_buffer(tty), (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 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;
|
|
spin_lock_irqsave(&tty->ctrl_lock, flags);
|
|
if (pktmode) {
|
|
if (!tty->packet) {
|
|
tty->packet = 1;
|
|
tty->link->ctrl_status = 0;
|
|
}
|
|
} else
|
|
tty->packet = 0;
|
|
spin_unlock_irqrestore(&tty->ctrl_lock, flags);
|
|
return 0;
|
|
}
|
|
default:
|
|
/* Try the mode commands */
|
|
return tty_mode_ioctl(tty, file, cmd, arg);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(n_tty_ioctl);
|