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Appendix A. Memory Plugin Sample Code

This appendix contains the complete code for the sample memory plugin. An explanation of this sample code and how to implement it is provided in A Sample Memory Plugin (in the The Device Management Agent topic) and in Updating the Web UI with the Sample Memory Plugin (in the topic called Using the Web UI Framework to Develop and Customize AP UIs).

This appendix contains the following:

The MemInfoPlugin.c Code 

#include <stdio.h>
#include <string.h>
#include <dman.h>
/* forward references declarations */
static void refresh_sysmem (struct dman_refresh_info *info);
static void refresh_detailmem (struct dman_refresh_info *info);
/* setup the sysMem Class */
static void setup_vlrs(void)
{
	struct dman_class* class;
	struct dman_property* prop;
	class = dman_class_new("sysmem");
	dman_class_set_persistence(class, 0);
	dman_class_set_type(class, DMAN_CLASS_TYPE_SINGLETON);
	prop = dman_property_new ("total");
	dman_property_set_writable (prop, 0);
	dman_property_set_persistence (prop, 0);
	dman_class_add_property (class, prop);
	prop = dman_property_new ("used");
	dman_property_set_writable (prop, 0);
	dman_property_set_persistence (prop, 0);
	dman_class_add_property (class, prop);
	prop = dman_property_new ("free");
	dman_property_set_writable (prop, 0);
	dman_property_set_persistence (prop, 0);
	dman_class_add_property (class, prop);
	prop = dman_property_new ("shared");
	dman_property_set_writable (prop, 0);
	dman_property_set_persistence (prop, 0);
	dman_class_add_property (class, prop);
	prop = dman_property_new ("buffers");
	dman_property_set_writable (prop, 0);
	dman_property_set_persistence (prop, 0);
	dman_class_add_property (class, prop);
	prop = dman_property_new ("cached");
	dman_property_set_writable (prop, 0);
	dman_property_set_persistence (prop, 0);
	dman_class_add_property (class, prop);
	dman_classes_add(class);
}
/* setup the Detailed Mem Class */
static void setup_detailmem_class(void)
{
	struct dman_class* class;
	struct dman_property* prop;
	class = dman_class_new("detailmem");
	dman_class_set_persistence(class, 0);
	dman_class_set_type(class, DMAN_CLASS_TYPE_ANONYMOUS);
	prop = dman_property_new ("label");
	dman_property_set_writable (prop, 0);
	dman_property_set_persistence (prop, 0);
	dman_class_add_property (class, prop);
	prop = dman_property_new ("value");
	dman_property_set_writable (prop, 0);
	dman_property_set_persistence (prop, 0);
	dman_class_add_property (class, prop);
	dman_classes_add(class);
}
/* setup System Memory Provider */
static void setup_sysmem_provider(void)
{
	struct dman_provider* provider;
	provider = dman_provider_new("sysmem");
	dman_provider_set_refresh_fn(provider,refresh_sysmem, NULL);
	dman_providers_add(provider);
}
/* setup Detailed Memory Provider */
static void setup_detailmem_provider(void)
{
	struct dman_provider* provider;
	provider = dman_provider_new("detailmem");
	dman_provider_set_refresh_fn(provider,refresh_detailmem, NULL);
	dman_providers_add(provider);
}
/* System Memory Refresh Function */
static void refresh_sysmem (struct dman_refresh_info *info)
{
	struct dman_instances *instances;
	struct dman_class *class;
	struct dman_instance *instance = NULL;
	FILE *fp;
	char total[16];
	char used[16];
	char free[16];
	char shared[16];
	char buffers[16];
	char cached[16];
	char line[128];
	if (strcmp(dman_refresh_info_get_class(info), "sysmem") != 0) {
		return;
	}
	instances = dman_refresh_info_get_instances(info);
	/*clearing instances*/
	dman_instances_delete_class(instances, "sysmem");
	/* open file pointer to /proc/memInfo */
	fp = fopen("/proc/meminfo", "r");
	/*throw away first line of the file*/
	fgets(line, sizeof(line),fp);
	class = dman_classes_get("sysmem");
	/* read information and write into class properties */
	fgets(line, sizeof(line), fp);
	sscanf(line, "%*s %s %s %s %s %s %s", total, used, free, shared, buffers, 
cached);
	instance = dman_instance_new(class, NULL);
	dman_instance_set_value(instance, "total", total);
	dman_instance_set_value(instance, "used", used);
	dman_instance_set_value(instance, "free", free);		
	dman_instance_set_value(instance, "shared", shared);			
	dman_instance_set_value(instance, "buffers", buffers);
	dman_instance_set_value(instance, "cached", cached);
	dman_instances_add(instances, instance);
	/*close file pointer */
	fclose(fp);
}
/* Detailed Memory Refresh Function */
static void refresh_detailmem (struct dman_refresh_info *info)
{
	struct dman_instances *instances;
	struct dman_class *class;
	struct dman_instance *instance = NULL;
	FILE *fp;
	char label[16];
	char value[8];
	int i;
	char line[128];
	if (strcmp(dman_refresh_info_get_class(info), "detailmem") != 0) {
		return;
	}
	instances = dman_refresh_info_get_instances(info);
	/*clearing instances*/
	dman_instances_delete_class(instances, "detailmem");
	/* open file pointer to /proc/memInfo */
	fp = fopen("/proc/meminfo", "r");
	/*throw away first three lines of the file*/
	for(i=0; i<3; i++)
		fgets(line, sizeof(line),fp);
	class = dman_classes_get("detailmem");
	/* read information and write into class properties */
	while (fgets(line, sizeof(line), fp) != NULL) {
		sscanf(line, "%s %s %*s", label, value);
		instance = dman_instance_new(class, NULL);
		dman_instance_set_value(instance, "label", label);
		dman_instance_set_value(instance, "value", value);
		dman_instances_add(instances, instance);
	}
	/*close file pointer */
	fclose(fp);
}
/* Plug-in Init Function */
void dman_plugin_init(void)
{
	dman_plugin_new("1.0");
	setup_sysmem_class();
	setup_detailmem_class();
	setup_sysmem_provider();
	setup_detailmem_provider();
}

The MemInfoWebUI Code

The meminfo Code (admin-features.hdf) 

meminfo {
	id = meminfo
	Query = action=meminfo
	LabelResKey = Meminfo
	MsgResKey = Meminfo
}
The Labels_en_us_ds.hdf File 
Labels {
	Meminfo = Memory
	SysMem = System Memory Information
	Total = Total
	Used = Used
	Free = Free
	Shared = Shared
	Buffers = Buffers
	Cached = Cached
	DetailMem = Detailed Memory Information
	Label = Label
	Size = Size
}

The Messages_en_us_ds.hdf File 

Messages {
	Meminfo = Memory Usage Information
}

The meminfo-action.hdf File 

actions {
	meminfo {
		data = device.sysmem device.detailmem
		targets = meminfo.html
	}
}

The meminfo.html Template 

<div class="page-header1"><?cs var:localize("Labels.SysMem") ?>:</div>
<table class="sectioned" cellpadding="0" cellspacing="0" width="80%">
  <tr class="section-row">
    <td class="section-header-super"><?cs var:localize("Labels.Total") ?>:</td>
    <td class="section-header-super"><?cs var:localize("Labels.Used") ?>:</td>
    <td class="section-header-super"><?cs var:localize("Labels.Free") ?>:</td>
    <td class="section-header-super"><?cs var:localize("Labels.Shared") ?>:</td>
    <td class="section-header-super"><?cs var:localize("Labels.Buffers") ?>:</td>
    <td class="section-header-super"><?cs var:localize("Labels.Cached") ?>:</td>
  </tr>
  <?cs each:chan = device.sysmem_s ?>
  <tr class="<?cs if:row_num % #2 == #0 ?>eventablerow<?cs else ?>oddtablerow<?cs /if 
?>">
    <td class="section-cell"><?cs var:chan.total ?></td>
    <td class="section-cell"><?cs var:chan.used ?></td>
    <td class="section-cell"><?cs var:chan.free ?></td>
    <td class="section-cell"><?cs var:chan.shared ?></td>
    <td class="section-cell"><?cs var:chan.buffers ?></td>
    <td class="section-cell"><?cs var:chan.cached ?></td>
  </tr>
  <?cs /each ?>
</table>
<div class="page-header2"><?cs var:localize("Labels.DetailMem") ?>:</div>
<table class="sectioned" cellpadding="0" cellspacing="0" width="80%">
  <tr class="section-row">
    <td class="section-header-super"><?cs var:localize("Labels.Label") ?>:</td>
    <td class="section-header-super"><?cs var:localize("Labels.Size") ?>:</td>
  </tr>
  <?cs each:chan = device.detailmem_s ?>
  <tr class="<?cs if:row_num % #2 == #0 ?>eventablerow<?cs else ?>oddtablerow<?cs /if 
?>">
    <td class="section-cell"><?cs var:chan.label ?></td>
    <td class="section-cell"><?cs var:chan.value ?></td>
  </tr>
  <?cs /each ?>
</table>
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