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31 * @(#)msgbuf.h 8.1 (Berkeley) 6/2/93
35 #ifndef _SYS_MSGBUF_H_
36 #define _SYS_MSGBUF_H_
39 #include <sys/mutex.h>
42 char *msg_ptr; /* pointer to buffer */
43 #define MSG_MAGIC 0x063062
45 u_int msg_size; /* size of buffer area */
46 u_int msg_wseq; /* write sequence number */
47 u_int msg_rseq; /* read sequence number */
48 u_int msg_cksum; /* checksum of contents */
49 u_int msg_seqmod; /* range for sequence numbers */
50 int msg_lastpri; /* saved priority value */
52 #define MSGBUF_NEEDNL 0x01 /* set when newline needed */
53 struct mtx msg_lock; /* mutex to protect the buffer */
56 /* Normalise a sequence number or a difference between sequence numbers. */
57 #define MSGBUF_SEQNORM(mbp, seq) (((seq) + (mbp)->msg_seqmod) % \
59 #define MSGBUF_SEQ_TO_POS(mbp, seq) ((seq) % (mbp)->msg_size)
60 /* Subtract sequence numbers. Note that only positive values result. */
61 #define MSGBUF_SEQSUB(mbp, seq1, seq2) (MSGBUF_SEQNORM((mbp), (seq1) - (seq2)))
64 extern int msgbufsize;
65 extern int msgbuftrigger;
66 extern struct msgbuf *msgbufp;
67 extern struct mtx msgbuf_lock;
69 void msgbufinit(void *ptr, int size);
70 void msgbuf_addchar(struct msgbuf *mbp, int c);
71 void msgbuf_addstr(struct msgbuf *mbp, int pri, const char *str, int filter_cr);
72 void msgbuf_clear(struct msgbuf *mbp);
73 void msgbuf_copy(struct msgbuf *src, struct msgbuf *dst);
74 int msgbuf_getbytes(struct msgbuf *mbp, char *buf, int buflen);
75 int msgbuf_getchar(struct msgbuf *mbp);
76 int msgbuf_getcount(struct msgbuf *mbp);
77 void msgbuf_init(struct msgbuf *mbp, void *ptr, int size);
78 int msgbuf_peekbytes(struct msgbuf *mbp, char *buf, int buflen,
80 void msgbuf_reinit(struct msgbuf *mbp, void *ptr, int size);
83 #define MSGBUF_SIZE (32768 * 3)
87 #endif /* !_SYS_MSGBUF_H_ */