Experimental Physics and
Industrial Control System

Heinz Junkes <[email protected]> · Thu, 19 Nov 2015 15:00:43 +0100

Hi all,

I am still fighting with glib running within procserv (or remote via ssh).

The aravislib used in areadetector to connect to GigE (Genicam) cameras uses glib.

Running the stuff locally works well. Running it remotely it fails.

Testfile:

h1@earth:~/ARAVIS/aravis/tests$ more loadhttptest.c

#include <glib.h>
#include <gio/gio.h>
#include <stdlib.h>
#include <stdio.h>
#include <arv.h>

int
main (int argc, char **argv)
{
	GFile *file;
	GFileInputStream *stream;
	const char *filename;
	char *genicam = NULL;
	char **tokens;
	gsize len = 0;
GError *err = NULL;

	if (argc != 2) {
		printf ("Usage: load-http-test <URL>\n");
		return EXIT_FAILURE;
	}

	filename = argv[1];

	tokens = g_regex_split (arv_gv_device_get_url_regex (), filename, 0);

	if (tokens[0] != NULL && tokens[1] != NULL) {
		if (g_ascii_strcasecmp (tokens[1], "http:") == 0) {
			file = g_file_new_for_uri (filename);
			stream = g_file_read (file, NULL, &err);

if (err != NULL) {
             g_error("Could not open %s for reading: %s\n", filename, err->message);
             g_error_free(err);
             return 1;
      }

			if(stream) {
				GDataInputStream *data_stream;

				data_stream = g_data_input_stream_new (G_INPUT_STREAM (stream));
				genicam = g_data_input_stream_read_upto (data_stream, "", 0, &len, NULL, NULL);

				g_object_unref (data_stream);
				g_object_unref (stream);
			}
			g_object_unref (file);
		}
	}

	g_strfreev (tokens);

	printf ("size = %lu\n", len);
	printf ("%s\n", genicam != NULL ? genicam : "NULL");

	g_free (genicam);

	return EXIT_SUCCESS;
}

Running it locally it shows:

h1@earth:~/ARAVIS/aravis/tests$ ./load-http-test http://141.14.128.47/dias_gige_desc.xml
size = 64451
<?xml version="1.0" encoding="utf-8"?>

<RegisterDescription
        ModelName="Pyroview"
        VendorName="DIAS"
        StandardNameSpace="None"
        SchemaMajorVersion="1"
        SchemaMinorVersion="0"
        SchemaSubMinorVersion="1"
        MajorVersion="1"
        MinorVersion=“ …

…
	<IntSwissKnife Name="NOT_TLParamsLocked">
		<ToolTip>Negation of the TLParamsLocked value</ToolTip>
		<Visibility>Invisible</Visibility>
		<pVariable Name="TLPL">TLParamsLocked</pVariable>
		<Formula>(TLPL = 0) ? 1 : 0</Formula>
	</IntSwissKnife>		

</RegisterDescription>

Running it remote via ssh it shows :

h1@earth:~/ARAVIS/aravis/tests$ ./load-http-test http://141.14.128.47/dias_gige_desc.xml

** (process:11455): ERROR **: Could not open http://141.14.128.47/dias_gige_desc.xml for reading: Operation not supported

Trace/breakpoint trap (core dumped)

I assume problems with dbus/session/stream stuff. About one year ago I could overcome the problem by adding the
following to the st.cmd used by procserv :

#!/bin/bash 

PID_FILE=/tmp/dbus_pid

if [ -a $PID_FILE ]
  then
#   echo "$PID_FILE exists ..."
    PID=`cat $PID_FILE` 
#   echo "kill_pid $PID"
    kill -9 $PID
fi

if test -z "$DBUS_SESSION_BUS_ADDRESS" ; then
  ## if not found, launch a new one
  eval `dbus-launch --sh-syntax --exit-with-session`
  echo "D-Bus per-session daemon address is: $DBUS_SESSION_BUS_ADDRESS"
  echo "$DBUS_SESSION_BUS_PID" >$PID_FILE
fi
#date
#sleep 1
#/usr/local/bin/arv-tool-0.4 -n 'DIAS Infrared GmbH-C1076026' genicam >/tmp/dias_genicam.out
#sleep 1
#date
cd /srv/ioc/sys/iocBoot/iocdias
./st.cmd
#kill -9 $DBUS_SESSION_BUS_PID

But this doesn’t help anymore.

Any Ideas?
Thx Heinz

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System