isdninfo man page on Mandriva

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isdninfo(4)			 Special files			   isdninfo(4)

NAME
       isdninfo - ISDN status device

SYNOPSIS
       #include <linux/isdn.h>

DESCRIPTION
       /dev/isdninfo is a character device with major number 45 and minor num‐
       ber 255.	 It delivers status information from the Linux ISDN  subsystem
       to user level.

DATA FORMAT
       When  reading  from  this  device, the current status of the Linux ISDN
       subsystem is delivered in 6 lines of text. Each line starts with a  tag
       string followed by a colon and whitespace. After that the status values
       are appended separated by whitespace.

       idmap  is the tag of the first line. In this  line  for	every  virtual
	      channel,	the  Id-string of the corresponding lowlevel driver is
	      shown. If no driver is loaded, a - (hyphen) is shown.

       chmap  is the tag of line 2. In this line for  every  virtual  channel,
	      the  channel  number  of	the  corresponding  lowlevel driver is
	      shown. If no driver is loaded, -1 is shown.

       drmap  is the tag of line 3. In this line for  every  virtual  channel,
	      the  index number of the corresponding lowlevel driver is shown.
	      If no driver is loaded, -1 is shown.

       usage  is the tag of line 4. In this line for  every  virtual  channel,
	      the  current  usage  is shown. The following usage constants are
	      defined:

	      ISDN_USAGE_NONE (0)
		     Unused channel

	      ISDN_USAGE_RAW (1)
		     Channel used by raw device (currently unsupported)

	      ISDN_USAGE_MODEM (2)
		     Channel used by some ttyI

	      ISDN_USAGE_NET (3)
		     Channel used by an ISDN net-interface

	      ISDN_USAGE_VOICE (4)
		     Channel used by some ttyI in voice mode.

	      ISDN_USAGE_EXCLUSIVE (64)
		     Channel exclusively preserved for a  net-interface.  This
		     value is logically or'ed with one of the other codes.

	      ISDN_USAGE_OUTGOING (128)
		     Channel  is  used outgoing. This value is logically or'ed
		     with one of the other codes. It is set, when dialling  is
		     started  and  reset, when either dialling failed or after
		     hangup. Therefore, it is not always an indicator  for  an
		     established  connection.  To get a reliable indicator for
		     an established connection, the driver flags  (see	below)
		     have to be inspected also.

       flags  is  the  tag of line 5. In this line for every driver slot, it's
	      B-Channel status is shown. If no driver is registered in a slot,
	      a	 ? is shown.  For every established B-Channel of the driver, a
	      bit is set in the shown value. The  driver's  first  channel  is
	      mapped to bit 0, the second channel to bit 1 and so on.

       phone  is  the  tag  of line 6. In this line for every virtual channel,
	      the remote phone number is shown if the channel is active. A ???
	      is shown, if the channel is inactive.

BLOCKING BEHAVIOUR
       After  opening  the  device,  at	 most  6  lines	 can be read by a user
       process.	 After that, the user process is blocked.  Whenever  a	status
       change  happens,	 the process is allowed to read 6 more lines, starting
       with line one.

IOCTL FUNCTIONS
       Currently, there are two ioctl calls supported:

       IIOCGETDVR
	      Get Revision information.
	      Returns an unsigned long	value  v,  representing	 various  user
	      level interface revisions, where

	      (v & 0xff)
		     is the revision of the modem-register info, available via
		     ioctl on /dev/isdnctrl.

	      ((v >> 8) & 0xff)
		     is the revision of the net-interface config data,	avail‐
		     able via ioctl on /dev/isdnctrl.  and

	      ((v >> 16) & 0xff)
		     is	 the  revision of the data delivered via /dev/isdninfo
		     itself.

       IIOCGETCPS
	      Get transfer statistics.
	      Returns the number of bytes transferred so far for  all  virtual
	      channels. The third parameter should be a pointer to an array of
	      unsigned long of size  ISDN_MAX_CHANNELS	*  2.  This  array  is
	      filled with the byte counter values upon return.

OTHER CONSTANTS
       There	 are	 some	  more	  useful    constants	 defined    in
       /usr/include/linux/isdn.h:

       ISDN_TTY_MAJOR
	      The major device number of /dev/ttyI.

       ISDN_TTYAUX_MAJOR
	      The major device number of /dev/cui.

       ISDN_MAJOR
	      The  major  device  number  of   /dev/isdnctrl,	/dev/isdninfo,
	      /dev/ippp and /dev/isdn

       ISDN_MAX_DRIVERS
	      The number of driver slots.

       ISDN_MAX_CHANNELS
	      The number of virtual channels.

       ISDN_MINOR_CTRL
	      The minor device number of /dev/isdnctrl0.

       ISDN_MINOR_CTRLMAX
	      The minor device number of /dev/isdnctrl63.

       ISDN_MINOR_PPP
	      The minor device number of /dev/ippp0.

       ISDN_MINOR_PPPMAX
	      The minor device number of /dev/ippp64.

       ISDN_MINOR_STATUS
	      The minor device number of /dev/isdninfo.

       Other  constants,  necessary for ioctl's on /dev/isdnctrl are listed in
       isdnctrl(4).

AUTHOR
       Fritz Elfert <fritz@isdn4linux.de>

SEE ALSO
       isdnctrl(4), icnctrl(4).

ISDN 4 Linux 3.12		  1999/09/06			   isdninfo(4)
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