86 lines
3.4 KiB
C
86 lines
3.4 KiB
C
/*-
|
|
* Copyright (c) 1981, 1984, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* @(#)msgbuf.h 8.1 (Berkeley) 6/2/93
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#ifndef _SYS_MSGBUF_H_
|
|
#define _SYS_MSGBUF_H_
|
|
|
|
#include <sys/lock.h>
|
|
#include <sys/mutex.h>
|
|
|
|
struct msgbuf {
|
|
char *msg_ptr; /* pointer to buffer */
|
|
#define MSG_MAGIC 0x063062
|
|
u_int msg_magic;
|
|
u_int msg_size; /* size of buffer area */
|
|
u_int msg_wseq; /* write sequence number */
|
|
u_int msg_rseq; /* read sequence number */
|
|
u_int msg_cksum; /* checksum of contents */
|
|
u_int msg_seqmod; /* range for sequence numbers */
|
|
int msg_lastpri; /* saved priority value */
|
|
u_int msg_flags;
|
|
#define MSGBUF_NEEDNL 0x01 /* set when newline needed */
|
|
struct mtx msg_lock; /* mutex to protect the buffer */
|
|
};
|
|
|
|
/* Normalise a sequence number or a difference between sequence numbers. */
|
|
#define MSGBUF_SEQNORM(mbp, seq) (((seq) + (mbp)->msg_seqmod) % \
|
|
(mbp)->msg_seqmod)
|
|
#define MSGBUF_SEQ_TO_POS(mbp, seq) ((seq) % (mbp)->msg_size)
|
|
/* Subtract sequence numbers. Note that only positive values result. */
|
|
#define MSGBUF_SEQSUB(mbp, seq1, seq2) (MSGBUF_SEQNORM((mbp), (seq1) - (seq2)))
|
|
|
|
#ifdef _KERNEL
|
|
extern int msgbufsize;
|
|
extern int msgbuftrigger;
|
|
extern struct msgbuf *msgbufp;
|
|
extern struct mtx msgbuf_lock;
|
|
|
|
void msgbufinit(void *ptr, int size);
|
|
void msgbuf_addchar(struct msgbuf *mbp, int c);
|
|
void msgbuf_addstr(struct msgbuf *mbp, int pri, char *str, int filter_cr);
|
|
void msgbuf_clear(struct msgbuf *mbp);
|
|
void msgbuf_copy(struct msgbuf *src, struct msgbuf *dst);
|
|
int msgbuf_getbytes(struct msgbuf *mbp, char *buf, int buflen);
|
|
int msgbuf_getchar(struct msgbuf *mbp);
|
|
int msgbuf_getcount(struct msgbuf *mbp);
|
|
void msgbuf_init(struct msgbuf *mbp, void *ptr, int size);
|
|
int msgbuf_peekbytes(struct msgbuf *mbp, char *buf, int buflen,
|
|
u_int *seqp);
|
|
void msgbuf_reinit(struct msgbuf *mbp, void *ptr, int size);
|
|
|
|
#ifndef MSGBUF_SIZE
|
|
#define MSGBUF_SIZE (32768 * 3)
|
|
#endif
|
|
#endif /* KERNEL */
|
|
|
|
#endif /* !_SYS_MSGBUF_H_ */
|