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marcus.erl |
/*
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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 <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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/**
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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 (!tty->driver->chars_in_buffer)
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return;
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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->driver->chars_in_buffer(tty), timeout) < 0)
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return;
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if (tty->driver->wait_until_sent)
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tty->driver->wait_until_sent(tty, timeout);
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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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267 |
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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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272 |
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if (ibaud - iclose <= baud_table[i] &&
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ibaud + iclose >= baud_table[i]) {
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274 |
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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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280 |
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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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284 |
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}
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285 |
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} while (++i < n_baud_table);
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286 |
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287 |
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/*
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288 |
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* If we found no match then use BOTHER if provided or warn
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289 |
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* the user their platform maintainer needs to wake up if not.
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*/
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291 |
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#ifdef BOTHER
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292 |
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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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295 |
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user already did */
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296 |
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if (ifound == -1 && (ibaud != obaud || ibinput))
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297 |
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termios->c_cflag |= (BOTHER << IBSHIFT);
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298 |
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#else
|
299 |
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if (ifound == -1 || ofound == -1) {
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300 |
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static int warned;
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301 |
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if (!warned++)
|
302 |
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printk(KERN_WARNING "tty: Unable to return correct "
|
303 |
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"speed data as your architecture needs updating.\n");
|
304 |
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}
|
305 |
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#endif
|
306 |
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}
|
307 |
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EXPORT_SYMBOL_GPL(tty_termios_encode_baud_rate);
|
308 |
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309 |
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void tty_encode_baud_rate(struct tty_struct *tty, speed_t ibaud, speed_t obaud)
|
310 |
|
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{
|
311 |
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tty_termios_encode_baud_rate(tty->termios, ibaud, obaud);
|
312 |
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}
|
313 |
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EXPORT_SYMBOL_GPL(tty_encode_baud_rate);
|
314 |
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|
315 |
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/**
|
316 |
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* tty_get_baud_rate - get tty bit rates
|
317 |
|
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* @tty: tty to query
|
318 |
|
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*
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319 |
|
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* Returns the baud rate as an integer for this terminal. The
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320 |
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* termios lock must be held by the caller and the terminal bit
|
321 |
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* flags may be updated.
|
322 |
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*
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323 |
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* Locking: none
|
324 |
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*/
|
325 |
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|
326 |
|
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speed_t tty_get_baud_rate(struct tty_struct *tty)
|
327 |
|
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{
|
328 |
|
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speed_t baud = tty_termios_baud_rate(tty->termios);
|
329 |
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|
330 |
|
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if (baud == 38400 && tty->alt_speed) {
|
331 |
|
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if (!tty->warned) {
|
332 |
|
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printk(KERN_WARNING "Use of setserial/setrocket to "
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333 |
|
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"set SPD_* flags is deprecated\n");
|
334 |
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tty->warned = 1;
|
335 |
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}
|
336 |
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baud = tty->alt_speed;
|
337 |
|
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}
|
338 |
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|
339 |
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return baud;
|
340 |
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}
|
341 |
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|
342 |
|
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EXPORT_SYMBOL(tty_get_baud_rate);
|
343 |
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|
344 |
|
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/**
|
345 |
|
|
* tty_termios_copy_hw - copy hardware settings
|
346 |
|
|
* @new: New termios
|
347 |
|
|
* @old: Old termios
|
348 |
|
|
*
|
349 |
|
|
* Propogate the hardware specific terminal setting bits from
|
350 |
|
|
* the old termios structure to the new one. This is used in cases
|
351 |
|
|
* where the hardware does not support reconfiguration or as a helper
|
352 |
|
|
* in some cases where only minimal reconfiguration is supported
|
353 |
|
|
*/
|
354 |
|
|
|
355 |
|
|
void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old)
|
356 |
|
|
{
|
357 |
|
|
/* The bits a dumb device handles in software. Smart devices need
|
358 |
|
|
to always provide a set_termios method */
|
359 |
|
|
new->c_cflag &= HUPCL | CREAD | CLOCAL;
|
360 |
|
|
new->c_cflag |= old->c_cflag & ~(HUPCL | CREAD | CLOCAL);
|
361 |
|
|
new->c_ispeed = old->c_ispeed;
|
362 |
|
|
new->c_ospeed = old->c_ospeed;
|
363 |
|
|
}
|
364 |
|
|
|
365 |
|
|
EXPORT_SYMBOL(tty_termios_copy_hw);
|
366 |
|
|
|
367 |
|
|
/**
|
368 |
|
|
* tty_termios_hw_change - check for setting change
|
369 |
|
|
* @a: termios
|
370 |
|
|
* @b: termios to compare
|
371 |
|
|
*
|
372 |
|
|
* Check if any of the bits that affect a dumb device have changed
|
373 |
|
|
* between the two termios structures, or a speed change is needed.
|
374 |
|
|
*/
|
375 |
|
|
|
376 |
|
|
int tty_termios_hw_change(struct ktermios *a, struct ktermios *b)
|
377 |
|
|
{
|
378 |
|
|
if (a->c_ispeed != b->c_ispeed || a->c_ospeed != b->c_ospeed)
|
379 |
|
|
return 1;
|
380 |
|
|
if ((a->c_cflag ^ b->c_cflag) & ~(HUPCL | CREAD | CLOCAL))
|
381 |
|
|
return 1;
|
382 |
|
|
return 0;
|
383 |
|
|
}
|
384 |
|
|
EXPORT_SYMBOL(tty_termios_hw_change);
|
385 |
|
|
|
386 |
|
|
/**
|
387 |
|
|
* change_termios - update termios values
|
388 |
|
|
* @tty: tty to update
|
389 |
|
|
* @new_termios: desired new value
|
390 |
|
|
*
|
391 |
|
|
* Perform updates to the termios values set on this terminal. There
|
392 |
|
|
* is a bit of layering violation here with n_tty in terms of the
|
393 |
|
|
* internal knowledge of this function.
|
394 |
|
|
*
|
395 |
|
|
* Locking: termios_sem
|
396 |
|
|
*/
|
397 |
|
|
|
398 |
|
|
static void change_termios(struct tty_struct * tty, struct ktermios * new_termios)
|
399 |
|
|
{
|
400 |
|
|
int canon_change;
|
401 |
|
|
struct ktermios old_termios = *tty->termios;
|
402 |
|
|
struct tty_ldisc *ld;
|
403 |
|
|
|
404 |
|
|
/*
|
405 |
|
|
* Perform the actual termios internal changes under lock.
|
406 |
|
|
*/
|
407 |
|
|
|
408 |
|
|
|
409 |
|
|
/* FIXME: we need to decide on some locking/ordering semantics
|
410 |
|
|
for the set_termios notification eventually */
|
411 |
|
|
mutex_lock(&tty->termios_mutex);
|
412 |
|
|
|
413 |
|
|
*tty->termios = *new_termios;
|
414 |
|
|
unset_locked_termios(tty->termios, &old_termios, tty->termios_locked);
|
415 |
|
|
canon_change = (old_termios.c_lflag ^ tty->termios->c_lflag) & ICANON;
|
416 |
|
|
if (canon_change) {
|
417 |
|
|
memset(&tty->read_flags, 0, sizeof tty->read_flags);
|
418 |
|
|
tty->canon_head = tty->read_tail;
|
419 |
|
|
tty->canon_data = 0;
|
420 |
|
|
tty->erasing = 0;
|
421 |
|
|
}
|
422 |
|
|
|
423 |
|
|
/* This bit should be in the ldisc code */
|
424 |
|
|
if (canon_change && !L_ICANON(tty) && tty->read_cnt)
|
425 |
|
|
/* Get characters left over from canonical mode. */
|
426 |
|
|
wake_up_interruptible(&tty->read_wait);
|
427 |
|
|
|
428 |
|
|
/* See if packet mode change of state. */
|
429 |
|
|
if (tty->link && tty->link->packet) {
|
430 |
|
|
int old_flow = ((old_termios.c_iflag & IXON) &&
|
431 |
|
|
(old_termios.c_cc[VSTOP] == '\023') &&
|
432 |
|
|
(old_termios.c_cc[VSTART] == '\021'));
|
433 |
|
|
int new_flow = (I_IXON(tty) &&
|
434 |
|
|
STOP_CHAR(tty) == '\023' &&
|
435 |
|
|
START_CHAR(tty) == '\021');
|
436 |
|
|
if (old_flow != new_flow) {
|
437 |
|
|
tty->ctrl_status &= ~(TIOCPKT_DOSTOP | TIOCPKT_NOSTOP);
|
438 |
|
|
if (new_flow)
|
439 |
|
|
tty->ctrl_status |= TIOCPKT_DOSTOP;
|
440 |
|
|
else
|
441 |
|
|
tty->ctrl_status |= TIOCPKT_NOSTOP;
|
442 |
|
|
wake_up_interruptible(&tty->link->read_wait);
|
443 |
|
|
}
|
444 |
|
|
}
|
445 |
|
|
|
446 |
|
|
if (tty->driver->set_termios)
|
447 |
|
|
(*tty->driver->set_termios)(tty, &old_termios);
|
448 |
|
|
else
|
449 |
|
|
tty_termios_copy_hw(tty->termios, &old_termios);
|
450 |
|
|
|
451 |
|
|
ld = tty_ldisc_ref(tty);
|
452 |
|
|
if (ld != NULL) {
|
453 |
|
|
if (ld->set_termios)
|
454 |
|
|
(ld->set_termios)(tty, &old_termios);
|
455 |
|
|
tty_ldisc_deref(ld);
|
456 |
|
|
}
|
457 |
|
|
mutex_unlock(&tty->termios_mutex);
|
458 |
|
|
}
|
459 |
|
|
|
460 |
|
|
/**
|
461 |
|
|
* set_termios - set termios values for a tty
|
462 |
|
|
* @tty: terminal device
|
463 |
|
|
* @arg: user data
|
464 |
|
|
* @opt: option information
|
465 |
|
|
*
|
466 |
|
|
* Helper function to prepare termios data and run necessary other
|
467 |
|
|
* functions before using change_termios to do the actual changes.
|
468 |
|
|
*
|
469 |
|
|
* Locking:
|
470 |
|
|
* Called functions take ldisc and termios_sem locks
|
471 |
|
|
*/
|
472 |
|
|
|
473 |
|
|
static int set_termios(struct tty_struct * tty, void __user *arg, int opt)
|
474 |
|
|
{
|
475 |
|
|
struct ktermios tmp_termios;
|
476 |
|
|
struct tty_ldisc *ld;
|
477 |
|
|
int retval = tty_check_change(tty);
|
478 |
|
|
|
479 |
|
|
if (retval)
|
480 |
|
|
return retval;
|
481 |
|
|
|
482 |
|
|
memcpy(&tmp_termios, tty->termios, sizeof(struct ktermios));
|
483 |
|
|
|
484 |
|
|
if (opt & TERMIOS_TERMIO) {
|
485 |
|
|
if (user_termio_to_kernel_termios(&tmp_termios,
|
486 |
|
|
(struct termio __user *)arg))
|
487 |
|
|
return -EFAULT;
|
488 |
|
|
#ifdef TCGETS2
|
489 |
|
|
} else if (opt & TERMIOS_OLD) {
|
490 |
|
|
if (user_termios_to_kernel_termios_1(&tmp_termios,
|
491 |
|
|
(struct termios __user *)arg))
|
492 |
|
|
return -EFAULT;
|
493 |
|
|
} else {
|
494 |
|
|
if (user_termios_to_kernel_termios(&tmp_termios,
|
495 |
|
|
(struct termios2 __user *)arg))
|
496 |
|
|
return -EFAULT;
|
497 |
|
|
}
|
498 |
|
|
#else
|
499 |
|
|
} else if (user_termios_to_kernel_termios(&tmp_termios,
|
500 |
|
|
(struct termios __user *)arg))
|
501 |
|
|
return -EFAULT;
|
502 |
|
|
#endif
|
503 |
|
|
|
504 |
|
|
/* If old style Bfoo values are used then load c_ispeed/c_ospeed with the real speed
|
505 |
|
|
so its unconditionally usable */
|
506 |
|
|
tmp_termios.c_ispeed = tty_termios_input_baud_rate(&tmp_termios);
|
507 |
|
|
tmp_termios.c_ospeed = tty_termios_baud_rate(&tmp_termios);
|
508 |
|
|
|
509 |
|
|
ld = tty_ldisc_ref(tty);
|
510 |
|
|
|
511 |
|
|
if (ld != NULL) {
|
512 |
|
|
if ((opt & TERMIOS_FLUSH) && ld->flush_buffer)
|
513 |
|
|
ld->flush_buffer(tty);
|
514 |
|
|
tty_ldisc_deref(ld);
|
515 |
|
|
}
|
516 |
|
|
|
517 |
|
|
if (opt & TERMIOS_WAIT) {
|
518 |
|
|
tty_wait_until_sent(tty, 0);
|
519 |
|
|
if (signal_pending(current))
|
520 |
|
|
return -EINTR;
|
521 |
|
|
}
|
522 |
|
|
|
523 |
|
|
change_termios(tty, &tmp_termios);
|
524 |
|
|
|
525 |
|
|
/* FIXME: Arguably if tmp_termios == tty->termios AND the
|
526 |
|
|
actual requested termios was not tmp_termios then we may
|
527 |
|
|
want to return an error as no user requested change has
|
528 |
|
|
succeeded */
|
529 |
|
|
return 0;
|
530 |
|
|
}
|
531 |
|
|
|
532 |
|
|
static int get_termio(struct tty_struct * tty, struct termio __user * termio)
|
533 |
|
|
{
|
534 |
|
|
if (kernel_termios_to_user_termio(termio, tty->termios))
|
535 |
|
|
return -EFAULT;
|
536 |
|
|
return 0;
|
537 |
|
|
}
|
538 |
|
|
|
539 |
|
|
static unsigned long inq_canon(struct tty_struct * tty)
|
540 |
|
|
{
|
541 |
|
|
int nr, head, tail;
|
542 |
|
|
|
543 |
|
|
if (!tty->canon_data || !tty->read_buf)
|
544 |
|
|
return 0;
|
545 |
|
|
head = tty->canon_head;
|
546 |
|
|
tail = tty->read_tail;
|
547 |
|
|
nr = (head - tail) & (N_TTY_BUF_SIZE-1);
|
548 |
|
|
/* Skip EOF-chars.. */
|
549 |
|
|
while (head != tail) {
|
550 |
|
|
if (test_bit(tail, tty->read_flags) &&
|
551 |
|
|
tty->read_buf[tail] == __DISABLED_CHAR)
|
552 |
|
|
nr--;
|
553 |
|
|
tail = (tail+1) & (N_TTY_BUF_SIZE-1);
|
554 |
|
|
}
|
555 |
|
|
return nr;
|
556 |
|
|
}
|
557 |
|
|
|
558 |
|
|
#ifdef TIOCGETP
|
559 |
|
|
/*
|
560 |
|
|
* These are deprecated, but there is limited support..
|
561 |
|
|
*
|
562 |
|
|
* The "sg_flags" translation is a joke..
|
563 |
|
|
*/
|
564 |
|
|
static int get_sgflags(struct tty_struct * tty)
|
565 |
|
|
{
|
566 |
|
|
int flags = 0;
|
567 |
|
|
|
568 |
|
|
if (!(tty->termios->c_lflag & ICANON)) {
|
569 |
|
|
if (tty->termios->c_lflag & ISIG)
|
570 |
|
|
flags |= 0x02; /* cbreak */
|
571 |
|
|
else
|
572 |
|
|
flags |= 0x20; /* raw */
|
573 |
|
|
}
|
574 |
|
|
if (tty->termios->c_lflag & ECHO)
|
575 |
|
|
flags |= 0x08; /* echo */
|
576 |
|
|
if (tty->termios->c_oflag & OPOST)
|
577 |
|
|
if (tty->termios->c_oflag & ONLCR)
|
578 |
|
|
flags |= 0x10; /* crmod */
|
579 |
|
|
return flags;
|
580 |
|
|
}
|
581 |
|
|
|
582 |
|
|
static int get_sgttyb(struct tty_struct * tty, struct sgttyb __user * sgttyb)
|
583 |
|
|
{
|
584 |
|
|
struct sgttyb tmp;
|
585 |
|
|
|
586 |
|
|
mutex_lock(&tty->termios_mutex);
|
587 |
|
|
tmp.sg_ispeed = tty->termios->c_ispeed;
|
588 |
|
|
tmp.sg_ospeed = tty->termios->c_ospeed;
|
589 |
|
|
tmp.sg_erase = tty->termios->c_cc[VERASE];
|
590 |
|
|
tmp.sg_kill = tty->termios->c_cc[VKILL];
|
591 |
|
|
tmp.sg_flags = get_sgflags(tty);
|
592 |
|
|
mutex_unlock(&tty->termios_mutex);
|
593 |
|
|
|
594 |
|
|
return copy_to_user(sgttyb, &tmp, sizeof(tmp)) ? -EFAULT : 0;
|
595 |
|
|
}
|
596 |
|
|
|
597 |
|
|
static void set_sgflags(struct ktermios * termios, int flags)
|
598 |
|
|
{
|
599 |
|
|
termios->c_iflag = ICRNL | IXON;
|
600 |
|
|
termios->c_oflag = 0;
|
601 |
|
|
termios->c_lflag = ISIG | ICANON;
|
602 |
|
|
if (flags & 0x02) { /* cbreak */
|
603 |
|
|
termios->c_iflag = 0;
|
604 |
|
|
termios->c_lflag &= ~ICANON;
|
605 |
|
|
}
|
606 |
|
|
if (flags & 0x08) { /* echo */
|
607 |
|
|
termios->c_lflag |= ECHO | ECHOE | ECHOK |
|
608 |
|
|
ECHOCTL | ECHOKE | IEXTEN;
|
609 |
|
|
}
|
610 |
|
|
if (flags & 0x10) { /* crmod */
|
611 |
|
|
termios->c_oflag |= OPOST | ONLCR;
|
612 |
|
|
}
|
613 |
|
|
if (flags & 0x20) { /* raw */
|
614 |
|
|
termios->c_iflag = 0;
|
615 |
|
|
termios->c_lflag &= ~(ISIG | ICANON);
|
616 |
|
|
}
|
617 |
|
|
if (!(termios->c_lflag & ICANON)) {
|
618 |
|
|
termios->c_cc[VMIN] = 1;
|
619 |
|
|
termios->c_cc[VTIME] = 0;
|
620 |
|
|
}
|
621 |
|
|
}
|
622 |
|
|
|
623 |
|
|
/**
|
624 |
|
|
* set_sgttyb - set legacy terminal values
|
625 |
|
|
* @tty: tty structure
|
626 |
|
|
* @sgttyb: pointer to old style terminal structure
|
627 |
|
|
*
|
628 |
|
|
* Updates a terminal from the legacy BSD style terminal information
|
629 |
|
|
* structure.
|
630 |
|
|
*
|
631 |
|
|
* Locking: termios_sem
|
632 |
|
|
*/
|
633 |
|
|
|
634 |
|
|
static int set_sgttyb(struct tty_struct * tty, struct sgttyb __user * sgttyb)
|
635 |
|
|
{
|
636 |
|
|
int retval;
|
637 |
|
|
struct sgttyb tmp;
|
638 |
|
|
struct ktermios termios;
|
639 |
|
|
|
640 |
|
|
retval = tty_check_change(tty);
|
641 |
|
|
if (retval)
|
642 |
|
|
return retval;
|
643 |
|
|
|
644 |
|
|
if (copy_from_user(&tmp, sgttyb, sizeof(tmp)))
|
645 |
|
|
return -EFAULT;
|
646 |
|
|
|
647 |
|
|
mutex_lock(&tty->termios_mutex);
|
648 |
|
|
termios = *tty->termios;
|
649 |
|
|
termios.c_cc[VERASE] = tmp.sg_erase;
|
650 |
|
|
termios.c_cc[VKILL] = tmp.sg_kill;
|
651 |
|
|
set_sgflags(&termios, tmp.sg_flags);
|
652 |
|
|
/* Try and encode into Bfoo format */
|
653 |
|
|
#ifdef BOTHER
|
654 |
|
|
tty_termios_encode_baud_rate(&termios, termios.c_ispeed, termios.c_ospeed);
|
655 |
|
|
#endif
|
656 |
|
|
mutex_unlock(&tty->termios_mutex);
|
657 |
|
|
change_termios(tty, &termios);
|
658 |
|
|
return 0;
|
659 |
|
|
}
|
660 |
|
|
#endif
|
661 |
|
|
|
662 |
|
|
#ifdef TIOCGETC
|
663 |
|
|
static int get_tchars(struct tty_struct * tty, struct tchars __user * tchars)
|
664 |
|
|
{
|
665 |
|
|
struct tchars tmp;
|
666 |
|
|
|
667 |
|
|
tmp.t_intrc = tty->termios->c_cc[VINTR];
|
668 |
|
|
tmp.t_quitc = tty->termios->c_cc[VQUIT];
|
669 |
|
|
tmp.t_startc = tty->termios->c_cc[VSTART];
|
670 |
|
|
tmp.t_stopc = tty->termios->c_cc[VSTOP];
|
671 |
|
|
tmp.t_eofc = tty->termios->c_cc[VEOF];
|
672 |
|
|
tmp.t_brkc = tty->termios->c_cc[VEOL2]; /* what is brkc anyway? */
|
673 |
|
|
return copy_to_user(tchars, &tmp, sizeof(tmp)) ? -EFAULT : 0;
|
674 |
|
|
}
|
675 |
|
|
|
676 |
|
|
static int set_tchars(struct tty_struct * tty, struct tchars __user * tchars)
|
677 |
|
|
{
|
678 |
|
|
struct tchars tmp;
|
679 |
|
|
|
680 |
|
|
if (copy_from_user(&tmp, tchars, sizeof(tmp)))
|
681 |
|
|
return -EFAULT;
|
682 |
|
|
tty->termios->c_cc[VINTR] = tmp.t_intrc;
|
683 |
|
|
tty->termios->c_cc[VQUIT] = tmp.t_quitc;
|
684 |
|
|
tty->termios->c_cc[VSTART] = tmp.t_startc;
|
685 |
|
|
tty->termios->c_cc[VSTOP] = tmp.t_stopc;
|
686 |
|
|
tty->termios->c_cc[VEOF] = tmp.t_eofc;
|
687 |
|
|
tty->termios->c_cc[VEOL2] = tmp.t_brkc; /* what is brkc anyway? */
|
688 |
|
|
return 0;
|
689 |
|
|
}
|
690 |
|
|
#endif
|
691 |
|
|
|
692 |
|
|
#ifdef TIOCGLTC
|
693 |
|
|
static int get_ltchars(struct tty_struct * tty, struct ltchars __user * ltchars)
|
694 |
|
|
{
|
695 |
|
|
struct ltchars tmp;
|
696 |
|
|
|
697 |
|
|
tmp.t_suspc = tty->termios->c_cc[VSUSP];
|
698 |
|
|
tmp.t_dsuspc = tty->termios->c_cc[VSUSP]; /* what is dsuspc anyway? */
|
699 |
|
|
tmp.t_rprntc = tty->termios->c_cc[VREPRINT];
|
700 |
|
|
tmp.t_flushc = tty->termios->c_cc[VEOL2]; /* what is flushc anyway? */
|
701 |
|
|
tmp.t_werasc = tty->termios->c_cc[VWERASE];
|
702 |
|
|
tmp.t_lnextc = tty->termios->c_cc[VLNEXT];
|
703 |
|
|
return copy_to_user(ltchars, &tmp, sizeof(tmp)) ? -EFAULT : 0;
|
704 |
|
|
}
|
705 |
|
|
|
706 |
|
|
static int set_ltchars(struct tty_struct * tty, struct ltchars __user * ltchars)
|
707 |
|
|
{
|
708 |
|
|
struct ltchars tmp;
|
709 |
|
|
|
710 |
|
|
if (copy_from_user(&tmp, ltchars, sizeof(tmp)))
|
711 |
|
|
return -EFAULT;
|
712 |
|
|
|
713 |
|
|
tty->termios->c_cc[VSUSP] = tmp.t_suspc;
|
714 |
|
|
tty->termios->c_cc[VEOL2] = tmp.t_dsuspc; /* what is dsuspc anyway? */
|
715 |
|
|
tty->termios->c_cc[VREPRINT] = tmp.t_rprntc;
|
716 |
|
|
tty->termios->c_cc[VEOL2] = tmp.t_flushc; /* what is flushc anyway? */
|
717 |
|
|
tty->termios->c_cc[VWERASE] = tmp.t_werasc;
|
718 |
|
|
tty->termios->c_cc[VLNEXT] = tmp.t_lnextc;
|
719 |
|
|
return 0;
|
720 |
|
|
}
|
721 |
|
|
#endif
|
722 |
|
|
|
723 |
|
|
/**
|
724 |
|
|
* send_prio_char - send priority character
|
725 |
|
|
*
|
726 |
|
|
* Send a high priority character to the tty even if stopped
|
727 |
|
|
*
|
728 |
|
|
* Locking: none for xchar method, write ordering for write method.
|
729 |
|
|
*/
|
730 |
|
|
|
731 |
|
|
static int send_prio_char(struct tty_struct *tty, char ch)
|
732 |
|
|
{
|
733 |
|
|
int was_stopped = tty->stopped;
|
734 |
|
|
|
735 |
|
|
if (tty->driver->send_xchar) {
|
736 |
|
|
tty->driver->send_xchar(tty, ch);
|
737 |
|
|
return 0;
|
738 |
|
|
}
|
739 |
|
|
|
740 |
|
|
if (tty_write_lock(tty, 0) < 0)
|
741 |
|
|
return -ERESTARTSYS;
|
742 |
|
|
|
743 |
|
|
if (was_stopped)
|
744 |
|
|
start_tty(tty);
|
745 |
|
|
tty->driver->write(tty, &ch, 1);
|
746 |
|
|
if (was_stopped)
|
747 |
|
|
stop_tty(tty);
|
748 |
|
|
tty_write_unlock(tty);
|
749 |
|
|
return 0;
|
750 |
|
|
}
|
751 |
|
|
|
752 |
|
|
/**
|
753 |
|
|
* tty_mode_ioctl - mode related ioctls
|
754 |
|
|
* @tty: tty for the ioctl
|
755 |
|
|
* @file: file pointer for the tty
|
756 |
|
|
* @cmd: command
|
757 |
|
|
* @arg: ioctl argument
|
758 |
|
|
*
|
759 |
|
|
* Perform non line discipline specific mode control ioctls. This
|
760 |
|
|
* is designed to be called by line disciplines to ensure they provide
|
761 |
|
|
* consistent mode setting.
|
762 |
|
|
*/
|
763 |
|
|
|
764 |
|
|
int tty_mode_ioctl(struct tty_struct * tty, struct file *file,
|
765 |
|
|
unsigned int cmd, unsigned long arg)
|
766 |
|
|
{
|
767 |
|
|
struct tty_struct * real_tty;
|
768 |
|
|
void __user *p = (void __user *)arg;
|
769 |
|
|
|
770 |
|
|
if (tty->driver->type == TTY_DRIVER_TYPE_PTY &&
|
771 |
|
|
tty->driver->subtype == PTY_TYPE_MASTER)
|
772 |
|
|
real_tty = tty->link;
|
773 |
|
|
else
|
774 |
|
|
real_tty = tty;
|
775 |
|
|
|
776 |
|
|
switch (cmd) {
|
777 |
|
|
#ifdef TIOCGETP
|
778 |
|
|
case TIOCGETP:
|
779 |
|
|
return get_sgttyb(real_tty, (struct sgttyb __user *) arg);
|
780 |
|
|
case TIOCSETP:
|
781 |
|
|
case TIOCSETN:
|
782 |
|
|
return set_sgttyb(real_tty, (struct sgttyb __user *) arg);
|
783 |
|
|
#endif
|
784 |
|
|
#ifdef TIOCGETC
|
785 |
|
|
case TIOCGETC:
|
786 |
|
|
return get_tchars(real_tty, p);
|
787 |
|
|
case TIOCSETC:
|
788 |
|
|
return set_tchars(real_tty, p);
|
789 |
|
|
#endif
|
790 |
|
|
#ifdef TIOCGLTC
|
791 |
|
|
case TIOCGLTC:
|
792 |
|
|
return get_ltchars(real_tty, p);
|
793 |
|
|
case TIOCSLTC:
|
794 |
|
|
return set_ltchars(real_tty, p);
|
795 |
|
|
#endif
|
796 |
|
|
case TCSETSF:
|
797 |
|
|
return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT | TERMIOS_OLD);
|
798 |
|
|
case TCSETSW:
|
799 |
|
|
return set_termios(real_tty, p, TERMIOS_WAIT | TERMIOS_OLD);
|
800 |
|
|
case TCSETS:
|
801 |
|
|
return set_termios(real_tty, p, TERMIOS_OLD);
|
802 |
|
|
#ifndef TCGETS2
|
803 |
|
|
case TCGETS:
|
804 |
|
|
if (kernel_termios_to_user_termios((struct termios __user *)arg, real_tty->termios))
|
805 |
|
|
return -EFAULT;
|
806 |
|
|
return 0;
|
807 |
|
|
#else
|
808 |
|
|
case TCGETS:
|
809 |
|
|
if (kernel_termios_to_user_termios_1((struct termios __user *)arg, real_tty->termios))
|
810 |
|
|
return -EFAULT;
|
811 |
|
|
return 0;
|
812 |
|
|
case TCGETS2:
|
813 |
|
|
if (kernel_termios_to_user_termios((struct termios2 __user *)arg, real_tty->termios))
|
814 |
|
|
return -EFAULT;
|
815 |
|
|
return 0;
|
816 |
|
|
case TCSETSF2:
|
817 |
|
|
return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT);
|
818 |
|
|
case TCSETSW2:
|
819 |
|
|
return set_termios(real_tty, p, TERMIOS_WAIT);
|
820 |
|
|
case TCSETS2:
|
821 |
|
|
return set_termios(real_tty, p, 0);
|
822 |
|
|
#endif
|
823 |
|
|
case TCGETA:
|
824 |
|
|
return get_termio(real_tty, p);
|
825 |
|
|
case TCSETAF:
|
826 |
|
|
return set_termios(real_tty, p, TERMIOS_FLUSH | TERMIOS_WAIT | TERMIOS_TERMIO);
|
827 |
|
|
case TCSETAW:
|
828 |
|
|
return set_termios(real_tty, p, TERMIOS_WAIT | TERMIOS_TERMIO);
|
829 |
|
|
case TCSETA:
|
830 |
|
|
return set_termios(real_tty, p, TERMIOS_TERMIO);
|
831 |
|
|
#ifndef TCGETS2
|
832 |
|
|
case TIOCGLCKTRMIOS:
|
833 |
|
|
if (kernel_termios_to_user_termios((struct termios __user *)arg, real_tty->termios_locked))
|
834 |
|
|
return -EFAULT;
|
835 |
|
|
return 0;
|
836 |
|
|
|
837 |
|
|
case TIOCSLCKTRMIOS:
|
838 |
|
|
if (!capable(CAP_SYS_ADMIN))
|
839 |
|
|
return -EPERM;
|
840 |
|
|
if (user_termios_to_kernel_termios(real_tty->termios_locked, (struct termios __user *) arg))
|
841 |
|
|
return -EFAULT;
|
842 |
|
|
return 0;
|
843 |
|
|
#else
|
844 |
|
|
case TIOCGLCKTRMIOS:
|
845 |
|
|
if (kernel_termios_to_user_termios_1((struct termios __user *)arg, real_tty->termios_locked))
|
846 |
|
|
return -EFAULT;
|
847 |
|
|
return 0;
|
848 |
|
|
|
849 |
|
|
case TIOCSLCKTRMIOS:
|
850 |
|
|
if (!capable(CAP_SYS_ADMIN))
|
851 |
|
|
return -EPERM;
|
852 |
|
|
if (user_termios_to_kernel_termios_1(real_tty->termios_locked, (struct termios __user *) arg))
|
853 |
|
|
return -EFAULT;
|
854 |
|
|
return 0;
|
855 |
|
|
#endif
|
856 |
|
|
case TIOCGSOFTCAR:
|
857 |
|
|
return put_user(C_CLOCAL(tty) ? 1 : 0, (int __user *)arg);
|
858 |
|
|
case TIOCSSOFTCAR:
|
859 |
|
|
if (get_user(arg, (unsigned int __user *) arg))
|
860 |
|
|
return -EFAULT;
|
861 |
|
|
mutex_lock(&tty->termios_mutex);
|
862 |
|
|
tty->termios->c_cflag =
|
863 |
|
|
((tty->termios->c_cflag & ~CLOCAL) |
|
864 |
|
|
(arg ? CLOCAL : 0));
|
865 |
|
|
mutex_unlock(&tty->termios_mutex);
|
866 |
|
|
return 0;
|
867 |
|
|
default:
|
868 |
|
|
return -ENOIOCTLCMD;
|
869 |
|
|
}
|
870 |
|
|
}
|
871 |
|
|
|
872 |
|
|
EXPORT_SYMBOL_GPL(tty_mode_ioctl);
|
873 |
|
|
|
874 |
|
|
int tty_perform_flush(struct tty_struct *tty, unsigned long arg)
|
875 |
|
|
{
|
876 |
|
|
struct tty_ldisc *ld;
|
877 |
|
|
int retval = tty_check_change(tty);
|
878 |
|
|
if (retval)
|
879 |
|
|
return retval;
|
880 |
|
|
|
881 |
|
|
ld = tty_ldisc_ref(tty);
|
882 |
|
|
switch (arg) {
|
883 |
|
|
case TCIFLUSH:
|
884 |
|
|
if (ld && ld->flush_buffer)
|
885 |
|
|
ld->flush_buffer(tty);
|
886 |
|
|
break;
|
887 |
|
|
case TCIOFLUSH:
|
888 |
|
|
if (ld && ld->flush_buffer)
|
889 |
|
|
ld->flush_buffer(tty);
|
890 |
|
|
/* fall through */
|
891 |
|
|
case TCOFLUSH:
|
892 |
|
|
if (tty->driver->flush_buffer)
|
893 |
|
|
tty->driver->flush_buffer(tty);
|
894 |
|
|
break;
|
895 |
|
|
default:
|
896 |
|
|
tty_ldisc_deref(ld);
|
897 |
|
|
return -EINVAL;
|
898 |
|
|
}
|
899 |
|
|
tty_ldisc_deref(ld);
|
900 |
|
|
return 0;
|
901 |
|
|
}
|
902 |
|
|
|
903 |
|
|
EXPORT_SYMBOL_GPL(tty_perform_flush);
|
904 |
|
|
|
905 |
|
|
int n_tty_ioctl(struct tty_struct * tty, struct file * file,
|
906 |
|
|
unsigned int cmd, unsigned long arg)
|
907 |
|
|
{
|
908 |
|
|
struct tty_struct * real_tty;
|
909 |
|
|
int retval;
|
910 |
|
|
|
911 |
|
|
if (tty->driver->type == TTY_DRIVER_TYPE_PTY &&
|
912 |
|
|
tty->driver->subtype == PTY_TYPE_MASTER)
|
913 |
|
|
real_tty = tty->link;
|
914 |
|
|
else
|
915 |
|
|
real_tty = tty;
|
916 |
|
|
|
917 |
|
|
switch (cmd) {
|
918 |
|
|
case TCXONC:
|
919 |
|
|
retval = tty_check_change(tty);
|
920 |
|
|
if (retval)
|
921 |
|
|
return retval;
|
922 |
|
|
switch (arg) {
|
923 |
|
|
case TCOOFF:
|
924 |
|
|
if (!tty->flow_stopped) {
|
925 |
|
|
tty->flow_stopped = 1;
|
926 |
|
|
stop_tty(tty);
|
927 |
|
|
}
|
928 |
|
|
break;
|
929 |
|
|
case TCOON:
|
930 |
|
|
if (tty->flow_stopped) {
|
931 |
|
|
tty->flow_stopped = 0;
|
932 |
|
|
start_tty(tty);
|
933 |
|
|
}
|
934 |
|
|
break;
|
935 |
|
|
case TCIOFF:
|
936 |
|
|
if (STOP_CHAR(tty) != __DISABLED_CHAR)
|
937 |
|
|
return send_prio_char(tty, STOP_CHAR(tty));
|
938 |
|
|
break;
|
939 |
|
|
case TCION:
|
940 |
|
|
if (START_CHAR(tty) != __DISABLED_CHAR)
|
941 |
|
|
return send_prio_char(tty, START_CHAR(tty));
|
942 |
|
|
break;
|
943 |
|
|
default:
|
944 |
|
|
return -EINVAL;
|
945 |
|
|
}
|
946 |
|
|
return 0;
|
947 |
|
|
case TCFLSH:
|
948 |
|
|
return tty_perform_flush(tty, arg);
|
949 |
|
|
case TIOCOUTQ:
|
950 |
|
|
return put_user(tty->driver->chars_in_buffer ?
|
951 |
|
|
tty->driver->chars_in_buffer(tty) : 0,
|
952 |
|
|
(int __user *) arg);
|
953 |
|
|
case TIOCINQ:
|
954 |
|
|
retval = tty->read_cnt;
|
955 |
|
|
if (L_ICANON(tty))
|
956 |
|
|
retval = inq_canon(tty);
|
957 |
|
|
return put_user(retval, (unsigned int __user *) arg);
|
958 |
|
|
case TIOCPKT:
|
959 |
|
|
{
|
960 |
|
|
int pktmode;
|
961 |
|
|
|
962 |
|
|
if (tty->driver->type != TTY_DRIVER_TYPE_PTY ||
|
963 |
|
|
tty->driver->subtype != PTY_TYPE_MASTER)
|
964 |
|
|
return -ENOTTY;
|
965 |
|
|
if (get_user(pktmode, (int __user *) arg))
|
966 |
|
|
return -EFAULT;
|
967 |
|
|
if (pktmode) {
|
968 |
|
|
if (!tty->packet) {
|
969 |
|
|
tty->packet = 1;
|
970 |
|
|
tty->link->ctrl_status = 0;
|
971 |
|
|
}
|
972 |
|
|
} else
|
973 |
|
|
tty->packet = 0;
|
974 |
|
|
return 0;
|
975 |
|
|
}
|
976 |
|
|
default:
|
977 |
|
|
/* Try the mode commands */
|
978 |
|
|
return tty_mode_ioctl(tty, file, cmd, arg);
|
979 |
|
|
}
|
980 |
|
|
}
|
981 |
|
|
|
982 |
|
|
EXPORT_SYMBOL(n_tty_ioctl);
|