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RedHat 9 (Linux i386) - man page for isdninfo (redhat section 4)

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 number 255.	It deliv-
       ers 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 estab-
		     lished 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  chan-
	      nel 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 num-
	      ber 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  revi-
	      sions, where

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

	      ((v >> 8) & 0xff)
		     is the revision of the net-interface config data,	available  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_CHAN-
	      NELS * 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 3.1pre4			    1999/09/06				      isdninfo(4)


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