66 lines
1.9 KiB
C
66 lines
1.9 KiB
C
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/*
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* UNIX An implementation of the AF_UNIX network domain for the
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* LINUX operating system. UNIX is implemented using the
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* BSD Socket interface as the means of communication with
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* the user level.
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*
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* This file descibes some things of the UNIX protocol family
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* module. It is mainly used for the "proc" sub-module now,
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* but it may be useful for cleaning up the UNIX module as a
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* whole later.
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*
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* Version: @(#)unix.h 1.0.3 05/25/93
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*
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* Authors: Orest Zborowski, <obz@Kodak.COM>
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* Ross Biro, <bir7@leland.Stanford.Edu>
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* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifdef _LINUX_UN_H
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struct unix_proto_data {
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int refcnt; /* cnt of reference 0=free */
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struct socket *socket; /* socket we're bound to */
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int protocol;
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struct sockaddr_un sockaddr_un;
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short sockaddr_len; /* >0 if name bound */
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char *buf;
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int bp_head, bp_tail;
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struct inode *inode;
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struct unix_proto_data *peerupd;
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struct wait_queue *wait; /* Lock across page faults (FvK) */
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int lock_flag;
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};
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extern struct unix_proto_data unix_datas[NSOCKETS];
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#define last_unix_data (unix_datas + NSOCKETS - 1)
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#define UN_DATA(SOCK) ((struct unix_proto_data *)(SOCK)->data)
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#define UN_PATH_OFFSET ((unsigned long)((struct sockaddr_un *)0) \
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->sun_path)
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/*
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* Buffer size must be power of 2. buffer mgmt inspired by pipe code.
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* note that buffer contents can wraparound, and we can write one byte less
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* than full size to discern full vs empty.
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*/
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#define BUF_SIZE PAGE_SIZE
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#define UN_BUF_AVAIL(UPD) (((UPD)->bp_head - (UPD)->bp_tail) & \
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(BUF_SIZE-1))
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#define UN_BUF_SPACE(UPD) ((BUF_SIZE-1) - UN_BUF_AVAIL(UPD))
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#endif /* _LINUX_UN_H */
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extern void unix_proto_init(struct ddi_proto *pro);
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