Summary:ASTERISK-05859: [patch] program for testing "is there any zaptel device?"
Reporter:Denis Smirnov (mithraen)Labels:
Date Opened:2005-12-17 10:07:59.000-0600Date Closed:2005-12-19 21:23:50.000-0600
Versions:Frequency of
Environment:Attachments:( 0) zt_exists.c
Description:This program can be used for loading ztdummy in initscript:

if ! zt_exists; then
  modprobe ztdummy

Can it be added to asterisk-addons?
Comments:By: Tilghman Lesher (tilghman) 2005-12-17 10:10:02.000-0600

Why not just do a simple shell test, i.e.

if [ -e /dev/zap/pseudo ]; then


By: Tzafrir Cohen (tzafrir) 2005-12-17 10:31:36.000-0600

/dev/zap/pseudo may exist but be invalid . To actually open it use something like: head -c 0 /dev/zap/pseudo

The scriptlet I use in my Debian package:

if [ ! -d /proc/zaptel ] || ! echo /proc/zaptel/* | grep -v '\*'
| grep -q .
then modprobe ztdummy

that is: if either zaptel itself was not loaded or if zaptel was loaded but no other zaptel module was loaded, load ztdummy.

This assumes that any other zaptel driver that has generated a span will also provide timing. I believe that this holds for all of the current zaptel drivers.

(consider the above snipet disclaimed, FWIW)

By: Denis Smirnov (mithraen) 2005-12-17 10:32:28.000-0600

Because it would not works without udev/devfs (when dev nodes created once and forevever) :)

By: Tilghman Lesher (tilghman) 2005-12-17 11:34:36.000-0600

tzafrir:  Verified that this works:

if head -c 0 /dev/zap/pseudo 2>/dev/null; then
   echo "zap installed"
   echo "not installed"

By: Tilghman Lesher (tilghman) 2005-12-19 21:23:50.000-0600

Since this operation can be done with shell scripting, there's no need for a separate executable.