#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sched.h>
/*
This was all theoretical, I could never get it to work on my box,
but the theory is the same. I'm grabbing all processes with the 
task_struct defined in  sched.h. I use the fancy for loop to go 
through each process because the macro for_each_process 
is busted for whatever reason and GCC hates it. While looping 
through each process, I decalre a file struct from the task 
struct and use it to retrieve the file open file descripts table 
with fd_array() which holds them. I test said array for a third
 element. If there is an element in that array, then my if
 statement is satisfied and I print out info about the process. 
*/
int init_mod(void)
{
struct task_struct  *task;
for (task = &init_task ; (task = next_task(task)) != &init_task ; )
{
	printk(KERN_CRIT "For this one: %s %d\n",task->comm, task->pid);
	int j =0;
        struct dentry *dentP = NULL;
        struct file *fileP = NULL;
        struct files_struct *file_struct = NULL ;

        file_struct = task->files;

        if ( file_struct )
        {
          if ( file_struct->fd_array[3]!=NULL ) 
/* if the file descriptor array is (starting at 0) 
has something in its 4th array slot, then it has 
more than 3 descriptors. The first is always stdin, 
second is stdout, third is usually stderr. /*
          {
            fileP = file_struct->fd_array;
           for ( j =0; j < NR_OPEN_DEFAULT; j++ )
            {
               if (fileP) {
printk("This process has 3 or more open file descriptors!\n");	
		printk("owner =  [%d]\n",fileP->f_uid);
		printk("group =  [%d]\n",fileP->f_gid);
		

	    }
	fileP++;
        }
	}

}
return 0;
}
void cleanup(void)
{
printk(KERN_CRIT "Bye bye!\n");
}