//-------------------------------------------------------------------
//	notifier.c
//
//	This module creates a pseudo-file (named '/proc/notifier')
//	which shows the 'notifier' and 'notifier_mask' fields from
//	each task's 'task_struct' object.   
//
//	NOTE: Written and tested with Linux kernel version 2.4.26.
//
//	programmer: ALLAN CRUSE
//	written on: 09 NOV 2004
//-------------------------------------------------------------------

#include <linux/module.h>	// for init_module() 
#include <linux/proc_fs.h>	// for create_proc_read_entry() 

static char modname[] = "notifier";

static int my_get_info( char *buf, char **start, off_t off, int count )
{
	struct task_struct	*tsk = &init_task;
	int	len;

	len = 0;
	len += sprintf( buf+len, "\n%s\n", modname );
	do	{
		len += sprintf( buf+len, "%15s ", tsk->comm );
		len += sprintf( buf+len, "pid=%-5d ", tsk->pid );
		len += sprintf( buf+len, "notifier=%08X ", tsk->notifier );
		len += sprintf( buf+len, "mask=%08X ", tsk->notifier_mask );
		len += sprintf( buf+len, "\n" );
		tsk = tsk->next_task;
		}
	while ( tsk != &init_task );
	len += sprintf( buf+len, "\n" );

	return	len;
}


void cleanup_module( void )
{
	remove_proc_entry( modname, NULL );
	printk( "<1>Removing \'%s\' module\n", modname );
}


int init_module( void )
{
	printk( "<1>\nInstalling \'%s\' module\n", modname );
	create_proc_info_entry( modname, 0, NULL, my_get_info );
	return	0;  // SUCCESS
}

MODULE_LICENSE("GPL");