2 * Copyright (c) 1981, 1984, 1993
3 * The Regents of the University of California. All rights reserved.
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6 * modification, are permitted provided that the following conditions
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9 * notice, this list of conditions and the following disclaimer.
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29 * @(#)msgbuf.h 8.1 (Berkeley) 6/2/93
33 #ifndef _SYS_MSGBUF_H_
34 #define _SYS_MSGBUF_H_
37 #include <sys/mutex.h>
40 char *msg_ptr; /* pointer to buffer */
41 #define MSG_MAGIC 0x063062
43 u_int msg_size; /* size of buffer area */
44 u_int msg_wseq; /* write sequence number */
45 u_int msg_rseq; /* read sequence number */
46 u_int msg_cksum; /* checksum of contents */
47 u_int msg_seqmod; /* range for sequence numbers */
48 int msg_lastpri; /* saved priority value */
50 #define MSGBUF_NEEDNL 0x01 /* set when newline needed */
51 struct mtx msg_lock; /* mutex to protect the buffer */
54 /* Normalise a sequence number or a difference between sequence numbers. */
55 #define MSGBUF_SEQNORM(mbp, seq) (((seq) + (mbp)->msg_seqmod) % \
57 #define MSGBUF_SEQ_TO_POS(mbp, seq) ((seq) % (mbp)->msg_size)
58 /* Subtract sequence numbers. Note that only positive values result. */
59 #define MSGBUF_SEQSUB(mbp, seq1, seq2) (MSGBUF_SEQNORM((mbp), (seq1) - (seq2)))
62 extern int msgbufsize;
63 extern int msgbuftrigger;
64 extern struct msgbuf *msgbufp;
65 extern struct mtx msgbuf_lock;
67 void msgbufinit(void *ptr, int size);
68 void msgbuf_addchar(struct msgbuf *mbp, int c);
69 void msgbuf_addstr(struct msgbuf *mbp, int pri, char *str, int filter_cr);
70 void msgbuf_clear(struct msgbuf *mbp);
71 void msgbuf_copy(struct msgbuf *src, struct msgbuf *dst);
72 int msgbuf_getbytes(struct msgbuf *mbp, char *buf, int buflen);
73 int msgbuf_getchar(struct msgbuf *mbp);
74 int msgbuf_getcount(struct msgbuf *mbp);
75 void msgbuf_init(struct msgbuf *mbp, void *ptr, int size);
76 int msgbuf_peekbytes(struct msgbuf *mbp, char *buf, int buflen,
78 void msgbuf_reinit(struct msgbuf *mbp, void *ptr, int size);
81 #define MSGBUF_SIZE (32768 * 3)
85 #endif /* !_SYS_MSGBUF_H_ */