Re: Dtrace and glib

["Veerapuram Varadhan" <vvaradhan novell com>]

On Wed, 2006-01-11 at 08:11 +0000, "Veerapuram Varadhan"  wrote:
> Hi,
> 
> I have gnusolaris (nexenta os) installed and was running dtrace on
> evolution to find memory leaks.  When I was running valgrind on
> evolution, couple of months back, I had a custom built gnome
environment
> with a "disabled mem pool" glib.  In gnusolaris, I don't have a glib
> with a "disabled mem pool", because of which, dtrace reports lots of
> (false) memory leaks.  
> 
> Is there any option to specify glib to disable mem pools? (without
> compiling it?)
> 

Found a way to work-around (or is it the only way?) this by the
following script...

#!/usr/sbin/dtrace -s

pid$target:libglib-2.0.so.0:g_malloc:entry
{
        self->trace = 1;
        self->size = arg0;
}
pid$target:libglib-2.0.so.0:g_malloc:return
/self->trace == 1/
{
        printf("Ptr=0x%p Size=%d", arg1, self->size);
        ustack();
        self->trace = 0;
        self->size = 0;
}

pid$target:libglib-2.0.so.0:g_realloc:entry
{
        self->trace = 1;
        self->size = arg1;
        self->oldptr = arg0;
}

pid$target:libglib-2.0.so.0:g_realloc:return
/self->trace == 1/
{
        printf("Ptr=0x%p Oldptr=0x%p Size=%d", arg1, self->oldptr,
self->size);
        ustack();
        self->trace = 0;
        self->size = 0;
}

pid$target:libglib-2.0.so.0:g_malloc0:entry
/self->trace == 1/
{
        self->trace = 1;
        self->size = arg1;
}

pid$target:libglib-2.0.so.0:g_malloc0:return
/self->trace == 1/
{
        printf("Ptr=0x%p Size=%d", arg1, self->size);
        ustack();
        self->trace = 0;
        self->size = 0;
}

pid$target:libglib-2.0.so.0:g_free:entry
{
        printf("Ptr=0x%p ", arg0);
}

and tested the following sample program:

#include <stdio.h>
#include <glib.h>

int
main ()
{
	gchar* str = NULL;
	int i;
	
	for (i = 0; i < 10; i++) {
		str = g_strdup ("0123456789");
		printf ("%s\n", str);
		g_free (str);
	}
	return 0;
}

and it printed.... (after processing the output dump of my dtrace
script)

Total memory leak (in bytes): 0


V. Varadhan