//-------------------------------------------------------------------
//	tasklist.c
//
//	This module creates a pseudo-file (named '/proc/tasklist')
//	that will display a list of all the system's active tasks.
//
//	NOTE: Written and tested using Linux kernel version 2.6.5.
//
//	programmer: ALLAN CRUSE
//	written on: 29 DEC 2004
//-------------------------------------------------------------------

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

static char modname[] = "tasklist";

static int my_get_info( char *buf, char **start, off_t off, int count )
{
	struct task_struct	*task = &init_task;
	int			n_elt = 0, len = 0;

	do	{
		++n_elt;
		len += sprintf( buf+len, "%5d ", task->pid );
		len += sprintf( buf+len, "%lu ", task->state );
		len += sprintf( buf+len, "%-15s ", task->comm );
		if ( ( n_elt % 3 ) == 0 ) len += sprintf( buf+len, "\n" );
		task = next_task( task );
		}
	while ( task != &init_task );

	len += sprintf( buf+len, "\n" );
	return	len;
}


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


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

MODULE_LICENSE("GPL");