Re: [Cppcms-users] cppcms::service and system(..)

[Christian G. <chr...@gm...>]

Hi all,


I have found some time and I am still working in this issue. The
current state is the following:

void Service::calibrate()
{
    // valid session needed
    if (!session().is_set("user"))
    {
        BOOSTER_DEBUG("Service") << __func__ << ") not logged in";
        return;
    }

    // only local host is allowed to do this
    if (request().remote_addr() != "127.0.0.1")
    {
        BOOSTER_DEBUG("Service") << __func__ << ") only on local host
- called from " << request().remote_addr();
        response().out() << "$.jGrowl(\"" << translate("Touch
calibration only allowed on local host") << "\");" << "\n";
        return;
    }

    response().out() << "$.jGrowl(\"" << translate("Starting
calibration") << "...\");" << "\n";
    BOOSTER_DEBUG("Service") << __func__ << ") doing action";

    system("/opt/scripts/set-backlight.sh 0");
    system("/opt/scripts/xcalibrate-touch.sh");
    system("/opt/scripts/set-backlight.sh 100");

    BOOSTER_DEBUG("Service") << __func__ << ") done";
}


system("/opt/scripts/set-backlight.sh 0"); call works as expected but
the whole web apps hangs
at the next call:
system("/opt/scripts/xcalibrate-touch.sh");


-----------------------------------------
#!/bin/bash
# Invokes touch screen calibrator (x11)

export DISPLAY=:0.0
BINARY=/opt/xinput_calibrator

CALDATA=`$BINARY | grep 'Setting new calibration data:' | cut -d ":"
-f 2 | tr -d ' ' | sed 's/,/ /g'`

# if CALDATA is empty simply return
if [ -z $CALDATA ]; then
  exit 0
fi

# at the moment we store our axis_calib data in
# the ID-Register. in some rare cases the
# ID-Register is not accessable and we need a
# fallback place to store our data.
if [ -e /proc/idreg/axis_calib ]; then
  echo $CALDATA > /proc/idreg/axis_calib
else
  echo $CALDATA > /home/vis/.axis_calib
fi
-----------------------------------------

xinput_calibrator can be found here https://github.com/tias/xinput_calibrator


At the moment I am not sure whats wrong and how to debug it. maybe someone
has an idea.

---
Christian Gmeiner, MSc


2012/7/19 Artyom Beilis <art...@ya...>:
>
>
> ----- Original Message -----
>> From: Christian Gmeiner <chr...@gm...>
>> To: Artyom Beilis <art...@ya...>; cpp...@li...
>> Cc:
>> Sent: Thursday, July 19, 2012 3:58 PM
>> Subject: Re: [Cppcms-users] cppcms::service and system(..)
>>
>> 2012/7/19 Artyom Beilis <art...@ya...>:
>>>  Make sure you do not call system from asynchronous application - call it
>>>  only from thread pool
>>>
>>
>> The asynchronous application (javascript RPC) get the call to execute
>> a bash script
>
> Asynchronous JavaScript or Asynchronously mounted CppCMS Application/RPC
>
>    http://cppcms.com/wikipp/en/page/cppcms_1x_application_lifetime
>
> I mean if you mount an application asynchronously than you can't call system from there
> as all I/O would be blocked by system
>
>> via system(..). How can I trigger the calling from thread pool?
>
> See in cppcms::service::thread_pool and cppcms::thread_pool documentation
>
>
>
> Artyom Beilis
>
> --------------
> CppCMS - C++ Web Framework:   http://cppcms.com/
> CppDB - C++ SQL Connectivity: http://cppcms.com/sql/cppdb/
>
>
>>
>> thanks
>> ---
>> Christian Gmeiner, MSc
>>
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