//-------------------------------------------------------------------
//	myfiles.c
//
//	This module creates a pseudo-file named '/proc/myfiles' that
//	lets an application see the names of the files it has opened.
//	
//	NOTE: Developed and tested using Linux kernel version 2.4.26.
//
//	programmer: ALLAN CRUSE
//	written on: 01 DEC 2004
//-------------------------------------------------------------------

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

static char modname[] = "myfiles";


static int my_get_info( char *buf, char **start, off_t off, int count )
{
	struct task_struct	*task = current;
	struct files_struct	*files = task->files;	
	unsigned long		i, len = 0;
	
	// show title for output
	len += sprintf( buf+len, "\nList of files opened by " );
	len += sprintf( buf+len, "\'%s\' ", task->comm );
	len += sprintf( buf+len, "(pid=%d):\n\n", task->pid );

	// show the names for the opened files
	for (i = 0; i < files->next_fd; i++)
		{
		struct file	*file = files->fd[i];
		struct dentry	*dentry = file->f_dentry;

		len += sprintf( buf+len, "%3d ", i );
		len += sprintf( buf+len, "%s\n", dentry->d_name );
		}

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


int init_module( void )
{
	create_proc_info_entry( modname, 0, NULL, my_get_info );
	return	0;  //SUCCESS
}


void cleanup_module( void )
{
	remove_proc_entry( modname, NULL );
}

MODULE_LICENSE("GPL");