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/*
* RT-Linux FIFOs
*
* Copyright (C) 1999 FSM Labs (http://www.fsmlabs.com/)
* Written by Michael Barabanov <baraban@fsmlabs.com>
*/
#ifndef __RTF__
#define __RTF__
#ifdef __KERNEL__
extern int rtf_init(void);
/* attach a handler to an RT-FIFO
*
* Allow function \arg{handler} to be called when a user process reads or
* writes to the FIFO. When the function is called, it is passed the fifo
* number as the argument.
*/
extern int rtf_create_handler(unsigned int fifo, /* RT-FIFO */
int (*handler)(unsigned int fifo) /* function to be called */);
/* create an RT-FIFO
*
* An RT-FIFO \arg{fifo} is created with initial size of \arg{size}.
*
* Return value: On success, \arg{size} is returned. On error, -1 is returned.
*/
extern int rtf_create(unsigned int fifo, int size);
/* destroy an RT-FIFO
*
* Return value: On success, 0 is returned
*/
extern int rtf_destroy(unsigned int fifo);
/* resize an RT-FIFO
*
* Return value: \arg{size} is returned on success. On error, a negative value
* is returned
*
* Bugs: This operation destroys the contents of the FIFO
*/
extern int rtf_resize(unsigned int minor, int size);
/*
* write to an RT-FIFO
*
* Try to write \arg{count} bytes to an FIFO. Return -1 if there's not enough space
* in the FIFO; otherwise return \arg{count}
*/
extern int rtf_put(unsigned int fifo, /* RT-FIFO */
void * buf, /* buffer address */
int count /* number of bytes to write */);
/*
* read from an RT-FIFO
*
* Try to read \arg{count} bytes from a FIFO.
* Return -1 if there's not enough data in the FIFO;
* otherwise return \arg{count}
*/
extern int rtf_get(unsigned int fifo, /* RT-FIFO */
void * buf, /* buffer address */
int count /* number of bytes to read */);
#define RTFSETSIZE 0
#define RTFMMAPABLE 1
#endif
#endif
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