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29 * @(#)socketvar.h 8.3 (Berkeley) 2/19/95
33 #ifndef _SYS_SOCKBUF_H_
34 #define _SYS_SOCKBUF_H_
35 #include <sys/selinfo.h> /* for struct selinfo */
36 #include <sys/_lock.h>
37 #include <sys/_mutex.h>
40 #define SB_MAX (2*1024*1024) /* default for max chars in sockbuf */
43 * Constants for sb_flags field of struct sockbuf.
45 #define SB_WAIT 0x04 /* someone is waiting for data/space */
46 #define SB_SEL 0x08 /* someone is selecting */
47 #define SB_ASYNC 0x10 /* ASYNC I/O, need signals */
48 #define SB_UPCALL 0x20 /* someone wants an upcall */
49 #define SB_NOINTR 0x40 /* operations not interruptible */
50 #define SB_AIO 0x80 /* AIO operations queued */
51 #define SB_KNOTE 0x100 /* kernel note attached */
52 #define SB_NOCOALESCE 0x200 /* don't coalesce new data into existing mbufs */
53 #define SB_IN_TOE 0x400 /* socket buffer is in the middle of an operation */
54 #define SB_AUTOSIZE 0x800 /* automatically size socket buffer */
55 #define SB_STOP 0x1000 /* backpressure indicator */
57 #define SBS_CANTSENDMORE 0x0010 /* can't send more data to peer */
58 #define SBS_CANTRCVMORE 0x0020 /* can't receive more data from peer */
59 #define SBS_RCVATMARK 0x0040 /* at mark on input */
79 * Variables for socket buffering.
82 struct selinfo sb_sel; /* process selecting read/write */
83 struct mtx sb_mtx; /* sockbuf lock */
84 struct sx sb_sx; /* prevent I/O interlacing */
85 short sb_state; /* (c/d) socket state on sockbuf */
86 #define sb_startzero sb_mb
87 struct mbuf *sb_mb; /* (c/d) the mbuf chain */
88 struct mbuf *sb_mbtail; /* (c/d) the last mbuf in the chain */
89 struct mbuf *sb_lastrecord; /* (c/d) first mbuf of last
90 * record in socket buffer */
91 struct mbuf *sb_sndptr; /* (c/d) pointer into mbuf chain */
92 struct mbuf *sb_fnrdy; /* (c/d) pointer to first not ready buffer */
93 u_int sb_sndptroff; /* (c/d) byte offset of ptr into chain */
94 u_int sb_acc; /* (c/d) available chars in buffer */
95 u_int sb_ccc; /* (c/d) claimed chars in buffer */
96 u_int sb_hiwat; /* (c/d) max actual char count */
97 u_int sb_mbcnt; /* (c/d) chars of mbufs used */
98 u_int sb_mcnt; /* (c/d) number of mbufs in buffer */
99 u_int sb_ccnt; /* (c/d) number of clusters in buffer */
100 u_int sb_mbmax; /* (c/d) max chars of mbufs to use */
101 u_int sb_ctl; /* (c/d) non-data chars in buffer */
102 int sb_lowat; /* (c/d) low water mark */
103 sbintime_t sb_timeo; /* (c/d) timeout for read/write */
104 short sb_flags; /* (c/d) flags, see below */
105 int (*sb_upcall)(struct socket *, void *, int); /* (c/d) */
106 void *sb_upcallarg; /* (c/d) */
112 * Per-socket buffer mutex used to protect most fields in the socket
115 #define SOCKBUF_MTX(_sb) (&(_sb)->sb_mtx)
116 #define SOCKBUF_LOCK_INIT(_sb, _name) \
117 mtx_init(SOCKBUF_MTX(_sb), _name, NULL, MTX_DEF)
118 #define SOCKBUF_LOCK_DESTROY(_sb) mtx_destroy(SOCKBUF_MTX(_sb))
119 #define SOCKBUF_LOCK(_sb) mtx_lock(SOCKBUF_MTX(_sb))
120 #define SOCKBUF_OWNED(_sb) mtx_owned(SOCKBUF_MTX(_sb))
121 #define SOCKBUF_UNLOCK(_sb) mtx_unlock(SOCKBUF_MTX(_sb))
122 #define SOCKBUF_LOCK_ASSERT(_sb) mtx_assert(SOCKBUF_MTX(_sb), MA_OWNED)
123 #define SOCKBUF_UNLOCK_ASSERT(_sb) mtx_assert(SOCKBUF_MTX(_sb), MA_NOTOWNED)
126 * Socket buffer private mbuf(9) flags.
128 #define M_NOTREADY M_PROTO1 /* m_data not populated yet */
129 #define M_BLOCKED M_PROTO2 /* M_NOTREADY in front of m */
130 #define M_NOTAVAIL (M_NOTREADY | M_BLOCKED)
132 void sbappend(struct sockbuf *sb, struct mbuf *m, int flags);
133 void sbappend_locked(struct sockbuf *sb, struct mbuf *m, int flags);
134 void sbappendstream(struct sockbuf *sb, struct mbuf *m, int flags);
135 void sbappendstream_locked(struct sockbuf *sb, struct mbuf *m, int flags);
136 int sbappendaddr(struct sockbuf *sb, const struct sockaddr *asa,
137 struct mbuf *m0, struct mbuf *control);
138 int sbappendaddr_locked(struct sockbuf *sb, const struct sockaddr *asa,
139 struct mbuf *m0, struct mbuf *control);
140 int sbappendaddr_nospacecheck_locked(struct sockbuf *sb,
141 const struct sockaddr *asa, struct mbuf *m0, struct mbuf *control);
142 int sbappendcontrol(struct sockbuf *sb, struct mbuf *m0,
143 struct mbuf *control);
144 int sbappendcontrol_locked(struct sockbuf *sb, struct mbuf *m0,
145 struct mbuf *control);
146 void sbappendrecord(struct sockbuf *sb, struct mbuf *m0);
147 void sbappendrecord_locked(struct sockbuf *sb, struct mbuf *m0);
148 void sbcompress(struct sockbuf *sb, struct mbuf *m, struct mbuf *n);
150 sbcreatecontrol(caddr_t p, int size, int type, int level);
151 void sbdestroy(struct sockbuf *sb, struct socket *so);
152 void sbdrop(struct sockbuf *sb, int len);
153 void sbdrop_locked(struct sockbuf *sb, int len);
155 sbcut_locked(struct sockbuf *sb, int len);
156 void sbdroprecord(struct sockbuf *sb);
157 void sbdroprecord_locked(struct sockbuf *sb);
158 void sbflush(struct sockbuf *sb);
159 void sbflush_locked(struct sockbuf *sb);
160 void sbrelease(struct sockbuf *sb, struct socket *so);
161 void sbrelease_internal(struct sockbuf *sb, struct socket *so);
162 void sbrelease_locked(struct sockbuf *sb, struct socket *so);
163 int sbreserve(struct sockbuf *sb, u_long cc, struct socket *so,
165 int sbreserve_locked(struct sockbuf *sb, u_long cc, struct socket *so,
168 sbsndptr(struct sockbuf *sb, u_int off, u_int len, u_int *moff);
170 sbsndmbuf(struct sockbuf *sb, u_int off, u_int *moff);
171 void sbtoxsockbuf(struct sockbuf *sb, struct xsockbuf *xsb);
172 int sbwait(struct sockbuf *sb);
173 int sblock(struct sockbuf *sb, int flags);
174 void sbunlock(struct sockbuf *sb);
175 void sballoc(struct sockbuf *, struct mbuf *);
176 void sbfree(struct sockbuf *, struct mbuf *);
177 int sbready(struct sockbuf *, struct mbuf *, int);
180 * Return how much data is available to be taken out of socket
184 sbavail(struct sockbuf *sb)
188 SOCKBUF_LOCK_ASSERT(sb);
194 * Return how much data sits there in the socket buffer
195 * It might be that some data is not yet ready to be read.
198 sbused(struct sockbuf *sb)
202 SOCKBUF_LOCK_ASSERT(sb);
208 * How much space is there in a socket buffer (so->so_snd or so->so_rcv)?
209 * This is problematical if the fields are unsigned, as the space might
210 * still be negative (ccc > hiwat or mbcnt > mbmax).
213 sbspace(struct sockbuf *sb)
215 int bleft, mleft; /* size should match sockbuf fields */
218 SOCKBUF_LOCK_ASSERT(sb);
221 if (sb->sb_flags & SB_STOP)
224 bleft = sb->sb_hiwat - sb->sb_ccc;
225 mleft = sb->sb_mbmax - sb->sb_mbcnt;
227 return ((bleft < mleft) ? bleft : mleft);
230 #define SB_EMPTY_FIXUP(sb) do { \
231 if ((sb)->sb_mb == NULL) { \
232 (sb)->sb_mbtail = NULL; \
233 (sb)->sb_lastrecord = NULL; \
235 } while (/*CONSTCOND*/0)
238 void sblastrecordchk(struct sockbuf *, const char *, int);
239 void sblastmbufchk(struct sockbuf *, const char *, int);
240 void sbcheck(struct sockbuf *, const char *, int);
241 #define SBLASTRECORDCHK(sb) sblastrecordchk((sb), __FILE__, __LINE__)
242 #define SBLASTMBUFCHK(sb) sblastmbufchk((sb), __FILE__, __LINE__)
243 #define SBCHECK(sb) sbcheck((sb), __FILE__, __LINE__)
245 #define SBLASTRECORDCHK(sb) do {} while (0)
246 #define SBLASTMBUFCHK(sb) do {} while (0)
247 #define SBCHECK(sb) do {} while (0)
248 #endif /* SOCKBUF_DEBUG */
252 #endif /* _SYS_SOCKBUF_H_ */