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/*
* UNIX An implementation of the AF_UNIX network domain for the
* LINUX operating system. UNIX is implemented using the
* BSD Socket interface as the means of communication with
* the user level.
*
* This file descibes some things of the UNIX protocol family
* module. It is mainly used for the "proc" sub-module now,
* but it may be useful for cleaning up the UNIX module as a
* whole later.
*
* Version: @(#)unix.h 1.0.3 05/25/93
*
* Authors: Orest Zborowski, <obz@Kodak.COM>
* Ross Biro, <bir7@leland.Stanford.Edu>
* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
*
* Fixes:
* Dmitry Gorodchanin - proc locking
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#ifdef _LINUX_UN_H
struct unix_proto_data {
int refcnt; /* cnt of reference 0=free */
/* -1=not initialised -bgm */
struct socket *socket; /* socket we're bound to */
int protocol;
struct sockaddr_un sockaddr_un;
short sockaddr_len; /* >0 if name bound */
char *buf;
int bp_head, bp_tail;
struct inode *inode;
struct unix_proto_data *peerupd;
struct wait_queue *wait; /* Lock across page faults (FvK) */
int lock_flag;
};
extern struct unix_proto_data unix_datas[NSOCKETS];
#define last_unix_data (unix_datas + NSOCKETS - 1)
#define UN_DATA(SOCK) ((struct unix_proto_data *)(SOCK)->data)
#define UN_PATH_OFFSET ((unsigned long)((struct sockaddr_un *)0) \
->sun_path)
/*
* Buffer size must be power of 2. buffer mgmt inspired by pipe code.
* note that buffer contents can wraparound, and we can write one byte less
* than full size to discern full vs empty.
*/
#define BUF_SIZE PAGE_SIZE
#define UN_BUF_AVAIL(UPD) (((UPD)->bp_head - (UPD)->bp_tail) & \
(BUF_SIZE-1))
#define UN_BUF_SPACE(UPD) ((BUF_SIZE-1) - UN_BUF_AVAIL(UPD))
#endif /* _LINUX_UN_H */
extern void unix_proto_init(struct ddi_proto *pro);