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/* $OpenBSD: file.h,v 1.12 2011/11/20 22:54:51 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 aproc;
struct pollfd;
struct timo {
struct timo *next;
unsigned val; /* time to wait before the callback */
unsigned set; /* true if the timeout is set */
void (*cb)(void *arg); /* routine to call on expiration */
void *arg; /* argument to give to 'cb' */
};
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 (*)(void *, int), void *);
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 */
#define FILE_RINUSE 0x20 /* inside rproc->ops->in() */
#define FILE_WINUSE 0x40 /* inside wproc->ops->out() */
unsigned state; /* one of above */
#ifdef DEBUG
#define FILE_MAXCYCLES 20
unsigned cycles; /* number of POLLIN/POLLOUT events */
#endif
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;
#ifdef DEBUG
extern long long file_wtime, file_utime;
#endif
void timo_set(struct timo *, void (*)(void *), void *);
void timo_add(struct timo *, unsigned);
void timo_del(struct timo *);
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_dbg(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) */
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