[mythtv] re: lirc, Motorola DCT2000 and the Actisys IR blaster

Wed, 20 Nov 2002 20:28:28 -0600

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If some of you have been using the scripts I posted back on Nov. 4 you
might be experiencing a strange issue similar to the following:

changing to 162
Changing from None to RecordingOnly
Can't open video device: /dev/video
open video:: Device or resource busy

The problem is because of this script:
---------------change_channel---------------
#!/bin/sh
echo "changing to $1"
/usr/local/bin/channel.pl $1 &
--------------------------------------------

If you change it the first line to #!/bin/csh the problem will go away.
After doing some research it appears bourne, bash and ksh inherit file
descriptors from the parent process (thereby keeping /dev/video open).
Csh closes all file destriptors when before the script starts.

Carlos

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<div class=3DSection1>

If some of you have been using the scripts I posted =
back on
Nov. 4 you might be experiencing a strange issue similar to the =
following:<o:p></o:p>

<pre><font size=3D2 face=3D"Courier New"><span =
style=3D'font-size:10.0pt'><o:p>&nbsp;</o:p></span></font></pre><pre><spa=
n
class=3DGramE><font size=3D2 face=3D"Courier New"><span =
style=3D'font-size:10.0pt'>changing</span></font></span> to =
162<o:p></o:p></pre><pre><font
size=3D2 face=3D"Courier New"><span style=3D'font-size:10.0pt'>Changing =
from None to <span
class=3DSpellE>RecordingOnly</span><o:p></o:p></span></font></pre><pre><f=
ont
size=3D2 face=3D"Courier New"><span style=3D'font-size:10.0pt'>Can't =
open video device: /dev/video<o:p></o:p></span></font></pre><pre><span
class=3DGramE><font size=3D2 face=3D"Courier New"><span =
style=3D'font-size:10.0pt'>open</span></font></span> video:: Device or =
resource busy<o:p></o:p></pre>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>The problem is because of this =
script:<o:p></o:p></span></font></p>

<pre><font size=3D2 face=3D"Courier New"><span =
style=3D'font-size:10.0pt'>---------------<span
class=3DSpellE>change_channel</span>---------------<o:p></o:p></span></fo=
nt></pre><pre><span
class=3DGramE><font size=3D2 face=3D"Courier New"><span =
style=3D'font-size:10.0pt'>#!/</span></font></span>bin/<span
class=3DSpellE>sh</span><o:p></o:p></pre><pre><span class=3DGramE><font =
size=3D2
face=3D"Courier New"><span =
style=3D'font-size:10.0pt'>echo</span></font></span> &quot;changing to =
$1&quot;<o:p></o:p></pre><pre><font
size=3D2 face=3D"Courier New"><span =
style=3D'font-size:10.0pt'>/usr/local/bin/channel.pl $1 =
&amp;<o:p></o:p></span></font></pre><pre><font
size=3D2 face=3D"Courier New"><span =
style=3D'font-size:10.0pt'>--------------------------------------------<o=
:p></o:p></span></font></pre>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

<pre>If you change it the first =
line to #!/bin/csh the problem =
will go away. After doing some research it appears bourne, bash and ksh =
inherit file descriptors from the parent process (thereby keeping =
/dev/video open). Csh closes all file destriptors when before the script =
starts.<o:p></o:p></pre><pre><o:p>&nbsp;</o:p></pre><pre><fon=
t
size=3D2 face=3D"Courier New">Carlos<o:p></o:p></pre>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><o:p>&nbsp;</o:p></span></font></p>

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