cregit-Linux how code gets into the kernel

Release 4.14 drivers/tty/tty_ioctl.c

Directory: drivers/tty
/*
 *  Copyright (C) 1991, 1992, 1993, 1994  Linus Torvalds
 *
 * Modified by Fred N. van Kempen, 01/29/93, to add line disciplines
 * which can be dynamically activated and de-activated by the line
 * discipline handling modules (like SLIP).
 */

#include <linux/types.h>
#include <linux/termios.h>
#include <linux/errno.h>
#include <linux/sched/signal.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/tty.h>
#include <linux/fcntl.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/bitops.h>
#include <linux/mutex.h>
#include <linux/compat.h>

#include <asm/io.h>
#include <linux/uaccess.h>


#undef TTY_DEBUG_WAIT_UNTIL_SENT

#ifdef TTY_DEBUG_WAIT_UNTIL_SENT

# define tty_debug_wait_until_sent(tty, f, args...)    tty_debug(tty, f, ##args)
#else

# define tty_debug_wait_until_sent(tty, f, args...)    do {} while (0)
#endif


#undef	DEBUG

/*
 * Internal flag options for termios setting behavior
 */

#define TERMIOS_FLUSH	1

#define TERMIOS_WAIT	2

#define TERMIOS_TERMIO	4

#define TERMIOS_OLD	8


/**
 *      tty_chars_in_buffer     -       characters pending
 *      @tty: terminal
 *
 *      Return the number of bytes of data in the device private
 *      output queue. If no private method is supplied there is assumed
 *      to be no queue on the device.
 */


int tty_chars_in_buffer(struct tty_struct *tty) { if (tty->ops->chars_in_buffer) return tty->ops->chars_in_buffer(tty); else return 0; }

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Alan Cox32100.00%1100.00%
Total32100.00%1100.00%

EXPORT_SYMBOL(tty_chars_in_buffer); /** * tty_write_room - write queue space * @tty: terminal * * Return the number of bytes that can be queued to this device * at the present time. The result should be treated as a guarantee * and the driver cannot offer a value it later shrinks by more than * the number of bytes written. If no method is provided 2K is always * returned and data may be lost as there will be no flow control. */
int tty_write_room(struct tty_struct *tty) { if (tty->ops->write_room) return tty->ops->write_room(tty); return 2048; }

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Alan Cox31100.00%1100.00%
Total31100.00%1100.00%

EXPORT_SYMBOL(tty_write_room); /** * tty_driver_flush_buffer - discard internal buffer * @tty: terminal * * Discard the internal output buffer for this device. If no method * is provided then either the buffer cannot be hardware flushed or * there is no buffer driver side. */
void tty_driver_flush_buffer(struct tty_struct *tty) { if (tty->ops->flush_buffer) tty->ops->flush_buffer(tty); }

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Alan Cox27100.00%1100.00%
Total27100.00%1100.00%

EXPORT_SYMBOL(tty_driver_flush_buffer); /** * tty_throttle - flow control * @tty: terminal * * Indicate that a tty should stop transmitting data down the stack. * Takes the termios rwsem to protect against parallel throttle/unthrottle * and also to ensure the driver can consistently reference its own * termios data at this point when implementing software flow control. */
void tty_throttle(struct tty_struct *tty) { down_write(&tty->termios_rwsem); /* check TTY_THROTTLED first so it indicates our state */ if (!test_and_set_bit(TTY_THROTTLED, &tty->flags) && tty->ops->throttle) tty->ops->throttle(tty); tty->flow_change = 0; up_write(&tty->termios_rwsem); }

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Alan Cox5183.61%250.00%
Peter Hurley1016.39%250.00%
Total61100.00%4100.00%

EXPORT_SYMBOL(tty_throttle); /** * tty_unthrottle - flow control * @tty: terminal * * Indicate that a tty may continue transmitting data down the stack. * Takes the termios rwsem to protect against parallel throttle/unthrottle * and also to ensure the driver can consistently reference its own * termios data at this point when implementing software flow control. * * Drivers should however remember that the stack can issue a throttle, * then change flow control method, then unthrottle. */
void tty_unthrottle(struct tty_struct *tty) { down_write(&tty->termios_rwsem); if (test_and_clear_bit(TTY_THROTTLED, &tty->flags) && tty->ops->unthrottle) tty->ops->unthrottle(tty); tty->flow_change = 0; up_write(&tty->termios_rwsem); }

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Alan Cox4983.05%250.00%
Peter Hurley1016.95%250.00%
Total59100.00%4100.00%

EXPORT_SYMBOL(tty_unthrottle); /** * tty_throttle_safe - flow control * @tty: terminal * * Similar to tty_throttle() but will only attempt throttle * if tty->flow_change is TTY_THROTTLE_SAFE. Prevents an accidental * throttle due to race conditions when throttling is conditional * on factors evaluated prior to throttling. * * Returns 0 if tty is throttled (or was already throttled) */
int tty_throttle_safe(struct tty_struct *tty) { int ret = 0; mutex_lock(&tty->throttle_mutex); if (!tty_throttled(tty)) { if (tty->flow_change != TTY_THROTTLE_SAFE) ret = 1; else { set_bit(TTY_THROTTLED, &tty->flags); if (tty->ops->throttle) tty->ops->throttle(tty); } } mutex_unlock(&tty->throttle_mutex); return ret; }

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Peter Hurley86100.00%4100.00%
Total86100.00%4100.00%

/** * tty_unthrottle_safe - flow control * @tty: terminal * * Similar to tty_unthrottle() but will only attempt unthrottle * if tty->flow_change is TTY_UNTHROTTLE_SAFE. Prevents an accidental * unthrottle due to race conditions when unthrottling is conditional * on factors evaluated prior to unthrottling. * * Returns 0 if tty is unthrottled (or was already unthrottled) */
int tty_unthrottle_safe(struct tty_struct *tty) { int ret = 0; mutex_lock(&tty->throttle_mutex); if (tty_throttled(tty)) { if (tty->flow_change != TTY_UNTHROTTLE_SAFE) ret = 1; else { clear_bit(TTY_THROTTLED, &tty->flags); if (tty->ops->unthrottle) tty->ops->unthrottle(tty); } } mutex_unlock(&tty->throttle_mutex); return ret; }

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Peter Hurley85100.00%4100.00%
Total85100.00%4100.00%

/** * tty_wait_until_sent - wait for I/O to finish * @tty: tty we are waiting for * @timeout: how long we will wait * * Wait for characters pending in a tty driver to hit the wire, or * for a timeout to occur (eg due to flow control) * * Locking: none */
void tty_wait_until_sent(struct tty_struct *tty, long timeout) { tty_debug_wait_until_sent(tty, "wait until sent, timeout=%ld\n", timeout); if (!timeout) timeout = MAX_SCHEDULE_TIMEOUT; timeout = wait_event_interruptible_timeout(tty->write_wait, !tty_chars_in_buffer(tty), timeout); if (timeout <= 0) return; if (timeout == MAX_SCHEDULE_TIMEOUT) timeout = 0; if (tty->ops->wait_until_sent) tty->ops->wait_until_sent(tty, timeout); }

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Linus Torvalds (pre-git)4958.33%1157.89%
Johan Hovold1821.43%210.53%
Jiri Slaby67.14%15.26%
Peter Hurley55.95%210.53%
Alan Cox33.57%15.26%
Al Viro22.38%15.26%
Cory T. Tusar11.19%15.26%
Total84100.00%19100.00%

EXPORT_SYMBOL(tty_wait_until_sent); /* * Termios Helper Methods */
static void unset_locked_termios(struct tty_struct *tty, struct ktermios *old) { struct ktermios *termios = &tty->termios; struct ktermios *locked = &tty->termios_locked; int i; #define NOSET_MASK(x, y, z) (x = ((x) & ~(z)) | ((y) & (z))) NOSET_MASK(termios->c_iflag, old->c_iflag, locked->c_iflag); NOSET_MASK(termios->c_oflag, old->c_oflag, locked->c_oflag); NOSET_MASK(termios->c_cflag, old->c_cflag, locked->c_cflag); NOSET_MASK(termios->c_lflag, old->c_lflag, locked->c_lflag); termios->c_line = locked->c_line ? old->c_line : termios->c_line; for (i = 0; i < NCCS; i++) termios->c_cc[i] = locked->c_cc[i] ? old->c_cc[i] : termios->c_cc[i]; /* FIXME: What should we do for i/ospeed */ }

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Linus Torvalds (pre-git)8751.79%466.67%
Alan Cox6136.31%116.67%
Peter Hurley2011.90%116.67%
Total168100.00%6100.00%

/** * tty_termios_copy_hw - copy hardware settings * @new: New termios * @old: Old termios * * Propagate the hardware specific terminal setting bits from * the old termios structure to the new one. This is used in cases * where the hardware does not support reconfiguration or as a helper * in some cases where only minimal reconfiguration is supported */
void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old) { /* The bits a dumb device handles in software. Smart devices need to always provide a set_termios method */ new->c_cflag &= HUPCL | CREAD | CLOCAL; new->c_cflag |= old->c_cflag & ~(HUPCL | CREAD | CLOCAL); new->c_ispeed = old->c_ispeed; new->c_ospeed = old->c_ospeed; }

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Alan Cox59100.00%1100.00%
Total59100.00%1100.00%

EXPORT_SYMBOL(tty_termios_copy_hw); /** * tty_termios_hw_change - check for setting change * @a: termios * @b: termios to compare * * Check if any of the bits that affect a dumb device have changed * between the two termios structures, or a speed change is needed. */
int tty_termios_hw_change(struct ktermios *a, struct ktermios *b) { if (a->c_ispeed != b->c_ispeed || a->c_ospeed != b->c_ospeed) return 1; if ((a->c_cflag ^ b->c_cflag) & ~(HUPCL | CREAD | CLOCAL)) return 1; return 0; }

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Alan Cox63100.00%1100.00%
Total63100.00%1100.00%

EXPORT_SYMBOL(tty_termios_hw_change); /** * tty_set_termios - update termios values * @tty: tty to update * @new_termios: desired new value * * Perform updates to the termios values set on this terminal. * A master pty's termios should never be set. * * Locking: termios_rwsem */
int tty_set_termios(struct tty_struct *tty, struct ktermios *new_termios) { struct ktermios old_termios; struct tty_ldisc *ld; WARN_ON(tty->driver->type == TTY_DRIVER_TYPE_PTY && tty->driver->subtype == PTY_TYPE_MASTER); /* * Perform the actual termios internal changes under lock. */ /* FIXME: we need to decide on some locking/ordering semantics for the set_termios notification eventually */ down_write(&tty->termios_rwsem); old_termios = tty->termios; tty->termios = *new_termios; unset_locked_termios(tty, &old_termios); 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->ops->set_termios) ld->ops->set_termios(tty, &old_termios); tty_ldisc_deref(ld); } up_write(&tty->termios_rwsem); return 0; }

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Alan Cox7145.22%942.86%
Linus Torvalds (pre-git)6138.85%942.86%
Peter Hurley2314.65%29.52%
Al Viro21.27%14.76%
Total157100.00%21100.00%

EXPORT_SYMBOL_GPL(tty_set_termios); /** * 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 tty_set_termios to do the actual changes. * * Locking: * Called functions take ldisc and termios_rwsem 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; down_read(&tty->termios_rwsem); tmp_termios = tty->termios; up_read(&tty->termios_rwsem); 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 }

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Alan Cox8456.00%538.46%
Linus Torvalds (pre-git)5637.33%538.46%
Al Viro42.67%17.69%
Peter Hurley42.67%17.69%
Linus Torvalds21.33%17.69%
Total150100.00%13100.00%

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->ops->flush_buffer) ld->ops->flush_buffer(tty); tty_ldisc_deref(ld); } if (opt & TERMIOS_WAIT) { tty_wait_until_sent(tty, 0); if (signal_pending(current)) return -ERESTARTSYS; } tty_set_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 void copy_termios(struct tty_struct *tty, struct ktermios *kterm) { down_read(&tty->termios_rwsem); *kterm = tty->termios; up_read(&tty->termios_rwsem); }

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Alan Cox3589.74%375.00%
Peter Hurley410.26%125.00%
Total39100.00%4100.00%


static void copy_termios_locked(struct tty_struct *tty, struct ktermios *kterm) { down_read(&tty->termios_rwsem); *kterm = tty->termios_locked; up_read(&tty->termios_rwsem); }

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Alan Cox3589.74%266.67%
Peter Hurley410.26%133.33%
Total39100.00%3100.00%


static int get_termio(struct tty_struct *tty, struct termio __user *termio) { struct ktermios kterm; copy_termios(tty, &kterm); if (kernel_termios_to_user_termio(termio, &kterm)) return -EFAULT; return 0; }

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Linus Torvalds (pre-git)3065.22%360.00%
Alan Cox1532.61%120.00%
Al Viro12.17%120.00%
Total46100.00%5100.00%

#ifdef TCGETX /** * set_termiox - set termiox fields if possible * @tty: terminal * @arg: termiox structure from user * @opt: option flags for ioctl type * * Implement the device calling points for the SYS5 termiox ioctl * interface in Linux */
static int set_termiox(struct tty_struct *tty, void __user *arg, int opt) { struct termiox tnew; struct tty_ldisc *ld; if (tty->termiox == NULL) return -EINVAL; if (copy_from_user(&tnew, arg, sizeof(struct termiox))) return -EFAULT; ld = tty_ldisc_ref(tty); if (ld != NULL) { if ((opt & TERMIOS_FLUSH) && ld->ops->flush_buffer) ld->ops->flush_buffer(tty); tty_ldisc_deref(ld); } if (opt & TERMIOS_WAIT) { tty_wait_until_sent(tty, 0); if (signal_pending(current)) return -ERESTARTSYS; } down_write(&tty->termios_rwsem); if (tty->ops->set_termiox) tty->ops->set_termiox(tty, &tnew); up_write(&tty->termios_rwsem); return 0; }

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Alan Cox16397.02%133.33%
Peter Hurley42.38%133.33%
Oleg Nesterov10.60%133.33%
Total168100.00%3100.00%

#endif #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 (!L_ICANON(tty)) { if (L_ISIG(tty)) flags |= 0x02; /* cbreak */ else flags |= 0x20; /* raw */ } if (L_ECHO(tty)) flags |= 0x08; /* echo */ if (O_OPOST(tty)) if (O_ONLCR(tty)) flags |= 0x10; /* crmod */ return flags; }

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Linus Torvalds (pre-git)6380.77%266.67%
Peter Hurley1519.23%133.33%
Total78100.00%3100.00%


static int get_sgttyb(struct tty_struct *tty, struct sgttyb __user *sgttyb) { struct sgttyb tmp; down_read(&tty->termios_rwsem); 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); up_read(&tty->termios_rwsem); return copy_to_user(sgttyb, &tmp, sizeof(tmp)) ? -EFAULT : 0; }

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Linus Torvalds (pre-git)7971.17%327.27%
Alan Cox2421.62%545.45%
Peter Hurley43.60%19.09%
Linus Torvalds32.70%19.09%
Al Viro10.90%19.09%
Total111100.00%11100.00%


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; } }

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Linus Torvalds (pre-git)14491.72%133.33%
Alan Cox138.28%266.67%
Total157100.00%3100.00%

/** * 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_rwsem */
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; down_write(&tty->termios_rwsem); 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 up_write(&tty->termios_rwsem); tty_set_termios(tty, &termios); return 0; }

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Linus Torvalds (pre-git)10169.18%333.33%
Alan Cox4027.40%444.44%
Peter Hurley42.74%111.11%
Al Viro10.68%111.11%
Total146100.00%9100.00%

#endif #ifdef TIOCGETC
static int get_tchars(struct tty_struct *tty, struct tchars __user *tchars) { struct tchars tmp; down_read(&tty->termios_rwsem); 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? */ up_read(&tty->termios_rwsem); return copy_to_user(tchars, &tmp, sizeof(tmp)) ? -EFAULT : 0; }

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Linus Torvalds (pre-git)10980.74%337.50%
Alan Cox1813.33%225.00%
Peter Hurley42.96%112.50%
Linus Torvalds32.22%112.50%
Al Viro10.74%112.50%
Total135100.00%8100.00%


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; down_write(&tty->termios_rwsem); 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? */ up_write(&tty->termios_rwsem); return 0; }

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Linus Torvalds (pre-git)11583.33%660.00%
Alan Cox1813.04%220.00%
Peter Hurley42.90%110.00%
Al Viro10.72%110.00%
Total138100.00%10100.00%

#endif #ifdef TIOCGLTC
static int get_ltchars(struct tty_struct *tty, struct ltchars __user *ltchars) { struct ltchars tmp; down_read(&tty->termios_rwsem); 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]; up_read(&tty->termios_rwsem); return copy_to_user(ltchars, &tmp, sizeof(tmp)) ? -EFAULT : 0; }

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Linus Torvalds (pre-git)10879.41%545.45%
Alan Cox2014.71%327.27%
Peter Hurley42.94%19.09%
Linus Torvalds32.21%19.09%
Al Viro10.74%19.09%
Total136100.00%11100.00%


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; down_write(&tty->termios_rwsem); 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; up_write(&tty->termios_rwsem); return 0; }

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Linus Torvalds (pre-git)11482.01%861.54%
Alan Cox2014.39%323.08%
Peter Hurley42.88%17.69%
Al Viro10.72%17.69%
Total139100.00%13100.00%

#endif /** * 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 rwsem */
static int tty_change_softcar(struct tty_struct *tty, int arg) { int ret = 0; int bit = arg ? CLOCAL : 0; struct ktermios old; down_write(&tty->termios_rwsem); 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 (C_CLOCAL(tty) != bit) ret = -EINVAL; up_write(&tty->termios_rwsem); return ret; }

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Alan Cox10193.52%360.00%
Peter Hurley76.48%240.00%
Total108100.00%5100.00%

/** * 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; int ret = 0; struct ktermios kterm; BUG_ON(file == NULL); 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: copy_termios(real_tty, &kterm); if (kernel_termios_to_user_termios((struct termios __user *)arg, &kterm)) ret = -EFAULT; return ret; #else case TCGETS: copy_termios(real_tty, &kterm); if (kernel_termios_to_user_termios_1((struct termios __user *)arg, &kterm)) ret = -EFAULT; return ret; case TCGETS2: copy_termios(real_tty, &kterm); if (kernel_termios_to_user_termios((struct termios2 __user *)arg, &kterm)) ret = -EFAULT; return ret; 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: copy_termios_locked(real_tty, &kterm); if (kernel_termios_to_user_termios((struct termios __user *)arg, &kterm)) ret = -EFAULT; return ret; case TIOCSLCKTRMIOS: if (!capable(CAP_SYS_ADMIN)) return -EPERM; copy_termios_locked(real_tty, &kterm); if (user_termios_to_kernel_termios(&kterm, (struct termios __user *) arg)) return -EFAULT; down_write(&real_tty->termios_rwsem); real_tty->termios_locked = kterm; up_write(&real_tty->termios_rwsem); return 0; #else case TIOCGLCKTRMIOS: copy_termios_locked(real_tty, &kterm); if (kernel_termios_to_user_termios_1((struct termios __user *)arg, &kterm)) ret = -EFAULT; return ret; case TIOCSLCKTRMIOS: if (!capable(CAP_SYS_ADMIN)) return -EPERM; copy_termios_locked(real_tty, &kterm); if (user_termios_to_kernel_termios_1(&kterm, (struct termios __user *) arg)) return -EFAULT; down_write(&real_tty->termios_rwsem); real_tty->termios_locked = kterm; up_write(&real_tty->termios_rwsem); return ret; #endif #ifdef TCGETX case TCGETX: { struct termiox ktermx; if (real_tty->termiox == NULL) return -EINVAL; down_read(&real_tty->termios_rwsem); memcpy(&ktermx, real_tty->termiox, sizeof(struct termiox)); up_read(&real_tty->termios_rwsem); if (copy_to_user(p, &ktermx, sizeof(struct termiox))) ret = -EFAULT; return ret; } case TCSETX: return set_termiox(real_tty, p, 0); case TCSETXW: return set_termiox(real_tty, p, TERMIOS_WAIT); case TCSETXF: return set_termiox(real_tty, p, TERMIOS_FLUSH); #endif case TIOCGSOFTCAR: copy_termios(real_tty, &kterm); ret = put_user((kterm.c_cflag & CLOCAL) ? 1 : 0, (int __user *)arg); return ret; case TIOCSSOFTCAR: if (get_user(arg, (unsigned int __user *) arg)) return -EFAULT; return tty_change_softcar(real_tty, arg); default: return -ENOIOCTLCMD; } }

Contributors

PersonTokensPropCommitsCommitProp
Alan Cox50359.32%1133.33%
Linus Torvalds (pre-git)29534.79%1751.52%
Al Viro283.30%26.06%
Peter Hurley121.42%13.03%
Mike Frysinger60.71%13.03%
Dave Jones40.47%13.03%
Total848100.00%33100.00%

EXPORT_SYMBOL_GPL(tty_mode_ioctl); /* Caller guarantees ldisc reference is held */
static int __tty_perform_flush(struct tty_struct *tty, unsigned long arg) { struct tty_ldisc *ld = tty->ldisc; switch (arg) { case TCIFLUSH: if (ld && ld->ops->flush_buffer) { ld->ops->flush_buffer(tty); tty_unthrottle(tty); } break; case TCIOFLUSH: if (ld && ld->ops->flush_buffer) { ld->ops->flush_buffer(tty); tty_unthrottle(tty); } /* fall through */ case TCOFLUSH: tty_driver_flush_buffer(tty); break; default: return -EINVAL; } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Alan Cox5753.27%444.44%
Linus Torvalds (pre-git)2624.30%222.22%
Ilya Zykov1413.08%111.11%
Peter Hurley87.48%111.11%
Zaur Kambarov21.87%111.11%
Total107100.00%9100.00%


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_wait(tty); retval = __tty_perform_flush(tty, arg); if (ld) tty_ldisc_deref(ld); return retval; }

Contributors

PersonTokensPropCommitsCommitProp
Peter Hurley5487.10%150.00%
Alan Cox812.90%150.00%
Total62100.00%2100.00%

EXPORT_SYMBOL_GPL(tty_perform_flush);
int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg) { int retval; switch (cmd) { case TCXONC: retval = tty_check_change(tty); if (retval) return retval; switch (arg) { case TCOOFF: spin_lock_irq(&tty->flow_lock); if (!tty->flow_stopped) { tty->flow_stopped = 1; __stop_tty(tty); } spin_unlock_irq(&tty->flow_lock); break; case TCOON: spin_lock_irq(&tty->flow_lock); if (tty->flow_stopped) { tty->flow_stopped = 0; __start_tty(tty); } spin_unlock_irq(&tty->flow_lock); break; case TCIOFF: if (STOP_CHAR(tty) != __DISABLED_CHAR) retval = tty_send_xchar(tty, STOP_CHAR(tty)); break; case TCION: if (START_CHAR(tty) != __DISABLED_CHAR) retval = tty_send_xchar(tty, START_CHAR(tty)); break; default: return -EINVAL; } return retval; case TCFLSH: retval = tty_check_change(tty); if (retval) return retval; return __tty_perform_flush(tty, arg); default: /* Try the mode commands */ return tty_mode_ioctl(tty, file, cmd, arg); } }

Contributors

PersonTokensPropCommitsCommitProp
Alan Cox15466.67%320.00%
Peter Hurley5825.11%533.33%
Linus Torvalds (pre-git)198.23%746.67%
Total231100.00%15100.00%

EXPORT_SYMBOL(n_tty_ioctl_helper); #ifdef CONFIG_COMPAT
long n_tty_compat_ioctl_helper(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg) { switch (cmd) { case TIOCGLCKTRMIOS: case TIOCSLCKTRMIOS: return tty_mode_ioctl(tty, file, cmd, (unsigned long) compat_ptr(arg)); default: return -ENOIOCTLCMD; } }

Contributors

PersonTokensPropCommitsCommitProp
Thomas Meyer59100.00%1100.00%
Total59100.00%1100.00%

EXPORT_SYMBOL(n_tty_compat_ioctl_helper); #endif

Overall Contributors

PersonTokensPropCommitsCommitProp
Alan Cox187045.10%2625.00%
Linus Torvalds (pre-git)159738.52%4139.42%
Peter Hurley47311.41%1615.38%
Thomas Meyer721.74%10.96%
Al Viro441.06%21.92%
Linus Torvalds190.46%21.92%
Johan Hovold180.43%21.92%
Ilya Zykov140.34%10.96%
Mike Frysinger60.14%10.96%
Jiri Slaby60.14%10.96%
Frederic Danis50.12%10.96%
Arnaldo Carvalho de Melo50.12%10.96%
Dave Jones40.10%10.96%
Arjan van de Ven30.07%10.96%
Oleg Nesterov20.05%10.96%
Adrian Bunk20.05%10.96%
Zaur Kambarov20.05%10.96%
Cory T. Tusar10.02%10.96%
Ingo Molnar10.02%10.96%
Lucas De Marchi10.02%10.96%
Jovi Zhang10.02%10.96%
Total4146100.00%104100.00%
Directory: drivers/tty
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