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make the code "more correct": add reference counters to aproc
structures so we can keep a pointer to the device. Beside some
simplifications, this allows to easily handle the situation
where the audio device desappears. No change in the behaviour.

/*	$OpenBSD: file.h,v 1.5 2008/12/29 17:59:08 ratchov Exp $	*/
/*
 * Copyright (c) 2008 Alexandre Ratchov <alex@caoua.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
#ifndef FILE_H
#define FILE_H

#include <sys/queue.h>
#include <sys/types.h>

struct file;
struct aparams;
struct aproc;
struct abuf;
struct pollfd;

struct fileops {
	char *name;
	size_t size;
	void (*close)(struct file *);
	unsigned (*read)(struct file *, unsigned char *, unsigned);
	unsigned (*write)(struct file *, unsigned char *, unsigned);	
	void (*start)(struct file *);
	void (*stop)(struct file *);
	int (*nfds)(struct file *);
	int (*pollfd)(struct file *, struct pollfd *, int);
	int (*revents)(struct file *, struct pollfd *);
};

struct file {
	struct fileops *ops;
	struct pollfd *pfd;		/* arg to poll(2) syscall */
#define FILE_ROK	0x1		/* file readable */
#define FILE_WOK	0x2		/* file writable */
#define FILE_EOF	0x4		/* eof on the read end */
#define FILE_HUP	0x8		/* hang-up on the write end */
#define FILE_ZOMB	0x10		/* closed, but struct not freed */
	unsigned state;			/* one of above */
	unsigned refs;			/* reference counter */
	char *name;			/* for debug purposes */
	struct aproc *rproc, *wproc;	/* reader and/or writer */
	LIST_ENTRY(file) entry;
};

LIST_HEAD(filelist,file);

extern struct filelist file_list;

void filelist_init(void);
void filelist_done(void);
void filelist_unlisten(void);

struct file *file_new(struct fileops *, char *, unsigned);
void file_del(struct file *);

void file_attach(struct file *, struct aproc *, struct aproc *);
unsigned file_read(struct file *, unsigned char *, unsigned);
unsigned file_write(struct file *, unsigned char *, unsigned);
int file_poll(void);
void file_eof(struct file *);
void file_hup(struct file *);
void file_close(struct file *);

#endif /* !defined(FILE_H) */