asterisk users - Apr 2010 - Asterisk 1.4.30 is slow sending STDIN to AGI script

I have upgraded Asterisk from 1.4.22 to 1.4.30 and I have noticed I am 
getting a lot of errors like this on the console :-
ERROR[23912]: utils.c:968 ast_carefulwrite: write() returned error: 
Broken pipe

I have tracked it down to a perl AGI script which performs our own CDR 
recording. It is called before the start of the call, once answered and 
again when the call is hungup.
It works fine when called before dialing and the AGI debugging shows 
asterisk sending the STDIN to the script very fast. When called after 
answering and at the end of the call asterisk is much slower sending the 
STDIN and I can see the debug scrolling up the screen and this is what 
is causing the error as the AGI script finished and exits before all the 
STDIN is sent. Even if I add a pause at the end of the script for 1 
second it only gets half way through sending the STDIN.

Why is asterisk so slow in sending the call info via STDIn in these cases?
Is there any way this can be fixed?

Thanks

Two suggestions - 1. Make sure your AGI has the proper syntax/handling -
just because it "works" doesn't mean that it will be happy in the
more
"restrictive" environment of a dialplan call. 
2.  If you are 100% certain that #1 has been addressed, change utils.c line
968 from
ast_log(LOG_ERROR, "write() returned error: %s\n", strerror(errno));
to 
ast_log(LOG_WARNING, "write() returned error: %s\n", strerror(errno));

and do a new make;make install.


-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Gareth Blades
Sent: Wednesday, April 28, 2010 3:51 AM
To: Asterisk Mailing List
Subject: [asterisk-users] Asterisk 1.4.30 is slow sending STDIN to AGI
script

I have upgraded Asterisk from 1.4.22 to 1.4.30 and I have noticed I am 
getting a lot of errors like this on the console :-
ERROR[23912]: utils.c:968 ast_carefulwrite: write() returned error: 
Broken pipe

I have tracked it down to a perl AGI script which performs our own CDR 
recording. It is called before the start of the call, once answered and 
again when the call is hungup.
It works fine when called before dialing and the AGI debugging shows 
asterisk sending the STDIN to the script very fast. When called after 
answering and at the end of the call asterisk is much slower sending the 
STDIN and I can see the debug scrolling up the screen and this is what 
is causing the error as the AGI script finished and exits before all the 
STDIN is sent. Even if I add a pause at the end of the script for 1 
second it only gets half way through sending the STDIN.

Why is asterisk so slow in sending the call info via STDIn in these cases?
Is there any way this can be fixed?

Thanks

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Check out this snippet from "Tilghman Lesher" (one of the true
Asterisk
Guru's)
http://www.mail-archive.com/asterisk-users at lists.digium.com/msg220482.html

It's a "NAG" (my term) introduced in the jump from 1.4.22 to
1.4.23 and
carried out through the rest of the 1.4 tree.

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Gareth Blades
Sent: Wednesday, April 28, 2010 3:51 AM
To: Asterisk Mailing List
Subject: [asterisk-users] Asterisk 1.4.30 is slow sending STDIN to AGI
script

I have upgraded Asterisk from 1.4.22 to 1.4.30 and I have noticed I am 
getting a lot of errors like this on the console :-
ERROR[23912]: utils.c:968 ast_carefulwrite: write() returned error: 
Broken pipe

I have tracked it down to a perl AGI script which performs our own CDR 
recording. It is called before the start of the call, once answered and 
again when the call is hungup.
It works fine when called before dialing and the AGI debugging shows 
asterisk sending the STDIN to the script very fast. When called after 
answering and at the end of the call asterisk is much slower sending the 
STDIN and I can see the debug scrolling up the screen and this is what 
is causing the error as the AGI script finished and exits before all the 
STDIN is sent. Even if I add a pause at the end of the script for 1 
second it only gets half way through sending the STDIN.

Why is asterisk so slow in sending the call info via STDIn in these cases?
Is there any way this can be fixed?

Thanks

-- 
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Hi!
> Why is asterisk so slow in sending the call info via STDIn in these cases?
> Is there any way this can be fixed?
Your AGI script is faulty: In at least one place you have missed to READ 
the output right after you have issued a command. So go check your script 
("agi debug" might help a little with this).

Others would say: Your script violates the AGI protocol.

Philipp

Philipp von Klitzing wrote:
> Hi!
> 
>> Why is asterisk so slow in sending the call info via STDIn in these
cases?
>> Is there any way this can be fixed?
> 
> Your AGI script is faulty: In at least one place you have missed to READ 
> the output right after you have issued a command. So go check your script 
> ("agi debug" might help a little with this).
> 
> Others would say: Your script violates the AGI protocol.
The script performs call logging to a database. Similar to the built in 
CDR but it updates at the start and answering of a call aswell so the 
database can be used to show current call status.

The script does not issue any commands. The same script is called at all 
3 stages but with different parameters on the command line to indicate 
the call status. Works fine before the call is answered but during and 
at the end of the call it quits before asterisk has finished sending the 
information about the current call via STDIN.

Can you post the script?

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Gareth Blades
Sent: Wednesday, April 28, 2010 9:00 AM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [asterisk-users] Asterisk 1.4.30 is slow sending STDIN to AGI
script

Philipp von Klitzing wrote:
> Hi!
> 
>> Why is asterisk so slow in sending the call info via STDIn in these
cases?
>> Is there any way this can be fixed?
> 
> Your AGI script is faulty: In at least one place you have missed to READ 
> the output right after you have issued a command. So go check your script 
> ("agi debug" might help a little with this).
> 
> Others would say: Your script violates the AGI protocol.
The script performs call logging to a database. Similar to the built in 
CDR but it updates at the start and answering of a call aswell so the 
database can be used to show current call status.

The script does not issue any commands. The same script is called at all 
3 stages but with different parameters on the command line to indicate 
the call status. Works fine before the call is answered but during and 
at the end of the call it quits before asterisk has finished sending the 
information about the current call via STDIN.

-- 
_____________________________________________________________________
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On Wed, 28 Apr 2010, Ryan Bullock wrote:
> Looking at the Asterisk::AGI docs, maybe try calling ReadParse() early
> in the script to read in anything from stdin?
>
> (From the docs)
> # pull AGI variables into %input
> %input = $AGI->ReadParse();
"early" == "before (any interaction with Asterisk || exit)"

-- 
Thanks in advance,
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