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Filename : tty.stp
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// tty tapset
// Copyright (C) 2009 IBM Corp.
// Copyright (C) 2010 Red Hat Inc.
//
// Author: Breno Leitao <leitao@linux.vnet.ibm.com>
//
// This file is part of systemtap, and is free software.  You can
// redistribute it and/or modify it under the terms of the GNU General
// Public License (GPL); either version 2, or (at your option) any
// later version.

/**
 * probe tty.open - Called when a tty is opened
 * @inode_number: the inode number
 * @inode_state: the inode state
 * @inode_flags: the inode flags
 * @file_name: the file name
 * @file_mode: the file mode
 * @file_flags: the file flags
 */
probe tty.open = kernel.function("tty_open")
{
	inode_number = $inode->i_ino
	inode_state = $inode->i_state
	inode_flags = $inode->i_flags

	file_name = d_name(@choose_defined($filp->f_path->dentry,
					   $filp->f_dentry))
	file_mode = $filp->f_mode
	file_flags = $filp->f_flags
}

/**
 * probe tty.release - Called when the tty is closed
 * @inode_number: the inode number
 * @inode_state: the inode state
 * @inode_flags: the inode flags
 * @file_name: the file name
 * @file_mode: the file mode
 * @file_flags: the file flags
 */
probe tty.release = kernel.function("tty_release")
{
	// RHEL4 (2.6.9) kernel's debuginfo doesn't seem to have
	// $inode, even though the function isn't inline.  So, make
	// sure $inode is defined.
	if (@defined($inode)) {
		inode_number = $inode->i_ino
		inode_state = $inode->i_state
		inode_flags = $inode->i_flags
	}
	else {
		inode_number = -1
		inode_state = -1
		inode_flags = -1
	}

	file_name = d_name(@choose_defined($filp->f_path->dentry,
					   $filp->f_dentry))
	file_mode = $filp->f_mode
	file_flags = $filp->f_flags
}

/**
 * probe tty.resize - Called when a terminal resize happens
 * @name: the tty name
 * @old_row: the old row value
 * @old_col: the old col value
 * @old_ypixel: the old ypixel
 * @old_xpixel: the old xpixel
 * @new_row: the new row value
 * @new_col: the new col value
 * @new_ypixel: the new ypixel value
 * @new_xpixel: the new xpixel value
*/
probe tty.resize = kernel.function("tiocswinsz")
{
%(systemtap_v < "2.8" %?
	name = kernel_string($tty->name)
%:
	name = kernel_string_quoted($tty->name)
%)
	old_row = $tty->winsize->ws_row
	old_col = $tty->winsize->ws_col
	old_ypixel = $tty->winsize->ws_ypixel
	old_xpixel = $tty->winsize->ws_xpixel

	if (@defined($arg)) {
		new_row = user_ushort($arg->ws_row)
		new_col = user_ushort($arg->ws_col)
		new_ypixel = user_ushort($arg->ws_ypixel)
		new_xpixel = user_ushort($arg->ws_xpixel)
	}
	else {
		new_row = -1
		new_col = -1
		new_ypixel = -1
		new_xpixel = -1
	}
}

/**
 * probe tty.ioctl - called when a ioctl is request to the tty
 * @name: the file name
 * @cmd: the ioctl command
 * @arg: the ioctl argument
 */
probe tty.ioctl = kernel.function("tty_ioctl")
{
%(systemtap_v < "2.8" %?
	name = kernel_string(@choose_defined($file->f_path->dentry->d_iname,
					     $file->f_dentry->d_iname))
%:
	name = kernel_string_quoted(@choose_defined($file->f_path->dentry->d_iname,
						    $file->f_dentry->d_iname))
%)
	cmd = $cmd
	arg = $arg
}

/**
 * probe tty.init - Called when a tty is being initalized
 * @driver_name: the driver name
 * @name: the driver  .dev_name name
 * @module: the module name
 */
probe tty.init = kernel.function("tty_init_dev") !,
		 kernel.function("init_dev")
{
%(systemtap_v < "2.8" %?
	driver_name = kernel_string($driver->driver_name)
	name = kernel_string($driver->name)
	module = kernel_string($driver->owner->name)
%:
	driver_name = kernel_string_quoted($driver->driver_name)
	name = kernel_string_quoted($driver->name)
	module = kernel_string_quoted($driver->owner->name)
%)
}

/**
 * probe tty.register - Called when a tty device is registred
 * @driver_name: the driver name
 * @name: the driver  .dev_name name
 * @module: the module name
 * @index: the tty index requested
 */
probe tty.register = kernel.function("tty_register_device")
{
%(systemtap_v < "2.8" %?
	driver_name = kernel_string($driver->driver_name)
	name = kernel_string($driver->name)
	module = kernel_string($driver->owner->name)
%:
	driver_name = kernel_string_quoted($driver->driver_name)
	name = kernel_string_quoted($driver->name)
	module = kernel_string_quoted($driver->owner->name)
%)
	index = $index
}

/**
 * probe tty.unregister - Called when a tty device is being unregistered
 * @driver_name: the driver name
 * @name: the driver  .dev_name name
 * @module: the module name
 * @index: the tty index requested
 */
probe tty.unregister = kernel.function("tty_unregister_device")
{
%(systemtap_v < "2.8" %?
	driver_name = kernel_string($driver->driver_name)
	name = kernel_string($driver->name)
	module = kernel_string($driver->owner->name)
%:
	driver_name = kernel_string_quoted($driver->driver_name)
	name = kernel_string_quoted($driver->name)
	module = kernel_string_quoted($driver->owner->name)
%)
	index = $index
}

/**
 * probe tty.poll - Called when a tty device is being polled
 * @file_name: the tty file name
 * @wait_key: the wait queue key
 */
probe tty.poll = kernel.function("tty_poll")
{
	file_name = d_name(@choose_defined($filp->f_path->dentry,
					   $filp->f_dentry))

	wait_key = (@defined($wait->key) ? ($wait ? $wait->key : 0) : 0)
}

/**
 * probe tty.receive - called when a tty receives a message
 * @cp: the buffer that was received
 * @fp: The flag buffer
 * @count: The amount of characters received
 * @driver_name: the driver name
 * @name: the name of the module file
 * @index: The tty Index
 * @id: the tty id
 */
probe tty.receive = kernel.function("n_tty_receive_buf")
{
%(systemtap_v < "2.8" %?
	cp = kernel_string($cp)
	fp = kernel_string($fp)
%:
	cp = kernel_string_quoted($cp)
	fp = kernel_string_quoted($fp)
%)
	count = $count

%(systemtap_v < "2.8" %?
	driver_name = kernel_string($tty->driver->driver_name)
	name = kernel_string($tty->driver->name)
%:
	driver_name = kernel_string_quoted($tty->driver->driver_name)
	name = kernel_string_quoted($tty->driver->name)
%)
	index = $tty->index
	id = $tty->magic
}

/**
 * probe tty.write - write to the tty line
 * @buffer: the buffer that will be written
 * @nr: The amount of characters
 * @driver_name: the driver name
 * @file_name: the file name lreated to the tty
 */
probe tty.write = kernel.function("n_tty_write") !,
		  kernel.function("write_chan")
{
%(systemtap_v < "2.8" %?
	buffer = kernel_string($buf)
%:
       buffer = kernel_buffer_quoted($buf, $nr, 0)
%)
	nr = $nr

	file_name = d_name(@choose_defined($file->f_path->dentry,
					   $file->f_dentry))
%(systemtap_v < "2.8" %?
	driver_name = kernel_string($tty->driver->driver_name)
%:
	driver_name = kernel_string_quoted($tty->driver->driver_name)
%)
}

/**
 * probe tty.read - called when a tty line will be read
 * @buffer: the buffer that will receive the characters
 * @nr: The amount of characters to be read
 * @driver_name: the driver name
 * @file_name: the file name lreated to the tty
 */
probe tty.read = kernel.function("n_tty_read") !,
		 kernel.function("read_chan")
{
%(systemtap_v < "2.8" %?
	buffer = kernel_string($buf)
%:
       buffer = kernel_buffer_quoted($buf, $nr, 0)
%)
	nr = $nr
	file_name = d_name(@choose_defined($file->f_path->dentry,
					   $file->f_dentry))
%(systemtap_v < "2.8" %?
	driver_name = kernel_string($tty->driver->driver_name)
%:
	driver_name = kernel_string_quoted($tty->driver->driver_name)
%)
}