/*
 * mysyscalls.c
 *
 * !!! this is a kernel file, and goes in LINUX_ROOT/kernel
 * !!! modify the Makefile in that directory to include the file
 * !!! in the kernel build.
 *
 * Implements an in-kernel ring buffer and logging, using syscalls.
 *
 * template 27 sep 2015 -burt
 *
 * student name:
 * revision history:
 */

#include<linux/kernel.h>
#include<linux/syscalls.h>

#define RING_BUFFER_SIZE 8 
#define RING_BUFFER_OP_IS_EMPTY 1
#define RING_BUFFER_OP_IS_FULL 2

struct RingBuffer {
	int next_in ;
	int next_out ;
	int is_full ; 
	char buffer[RING_BUFFER_SIZE] ;
} ;

static struct RingBuffer ring_buffer ;

asmlinkage long sys_my_syslog(const char * msg) {
	printk(KERN_ALERT "my_syslog: %s\n", msg) ;
	return 0 ;
}

asmlinkage long sys_rb_ioctl(unsigned int op) {
	/* code here */
	return 0 ;
}

asmlinkage long sys_rb_enqueue(const char c) {
	/* code here */
	return 0 ; 
}

asmlinkage long sys_rb_dequeue(void)  {
	/* code here */
	return 0 ;
}