[asterisk-bugs] [JIRA] (ASTERISK-23837) Can't read responses from AGI - 'Broken Pipe' errors from utils.c - astcarefulwrite when writing to STDIN

[Rusty Newton (JIRA)]

    [ https://issues.asterisk.org/jira/browse/ASTERISK-23837?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=219204#comment-219204 ] 

Rusty Newton commented on ASTERISK-23837:
-----------------------------------------

This is probably a config issue and not a bug. However we need to document the resolution on our wiki, as googling around I see where many people have run into this or similar issues with no resolution, or resolution that is undocumented.

> Can't read responses from AGI - 'Broken Pipe' errors from utils.c - astcarefulwrite when writing to STDIN
> ---------------------------------------------------------------------------------------------------------
>
>                 Key: ASTERISK-23837
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-23837
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Core/General, Utilities/General
>    Affects Versions: 11.10.0, 12.3.0
>            Reporter: Rusty Newton
>            Severity: Minor
>
> When looking into an unrelated issue, I saw the following:
> {noformat}
> <SIP/6001-00000004>AGI Rx << ANSWER
>        > 0xb7523800 -- Probation passed - setting RTP source address to 10.24.18.16:4042
> <SIP/6001-00000004>AGI Tx >> 200 result=0
> [Jun  9 13:05:02] ERROR[13442][C-00000004]: utils.c:1328 ast_carefulwrite: write() returned error: Broken pipe
> <SIP/6001-00000004>AGI Rx << RECORD FILE recordfiletest wav 9 60000 0 0 demo-congrats
>     -- <SIP/6001-00000004> Playing 'beep.gsm' (language 'en')
> <SIP/6001-00000004>AGI Tx >> 200 result=-1 (hangup) endpos=8000
> [Jun  9 13:05:04] ERROR[13442][C-00000004]: utils.c:1328 ast_carefulwrite: write() returned error: Broken pipe
>     -- <SIP/6001-00000004>AGI Script ASTERISK23772.sh completed, returning 4
>   == Spawn extension (from-internal, 101, 1) exited non-zero on 'SIP/6001-00000004'
> {noformat}
> It appears that the Broken Pipe errors come after Asterisk attempts to write out AGI responses to STDIN.
> I'm not great with AGI or bash, but I tried redirecting the output of the read commands to a file to see if I could verify what the script was receiving or not receiving.
> {code}
> #!/bin/bash
> while read VAR && [ -n ${VAR} ] ; do : ; done
> echo 'ANSWER'
> read RESPONSE >> /tmp/responses.txt
> echo 'RECORD FILE recordfiletest wav 9 60000 0 0 demo-congrats'
> read RESPONSE >> /tmp/responses.txt
> exit 0
> {code}
> The responses.txt file gets created, but remains blank.
> The AGI actions called work fine and the call behaves as expected.
> Other issues with Broken Pipe symptoms have been filed, but I don't think they are the same.
> ASTERISK-23549
> ASTERISK-20087
> Asterisk has permissions to read,write and execute the script. SElinux is not involved. I'm not sure why Asterisk can't write to STDIN.



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