Willy Tarreau | baaee00 | 2006-06-26 02:48:02 +0200 | [diff] [blame] | 1 | /* |
Willy Tarreau | c7e4238 | 2012-08-24 19:22:53 +0200 | [diff] [blame] | 2 | * include/proto/channel.h |
| 3 | * Channel management definitions, macros and inline functions. |
Willy Tarreau | 7c3c541 | 2009-12-13 15:53:05 +0100 | [diff] [blame] | 4 | * |
Willy Tarreau | a27dc19 | 2014-11-27 22:10:04 +0100 | [diff] [blame] | 5 | * Copyright (C) 2000-2014 Willy Tarreau - w@1wt.eu |
Willy Tarreau | 7c3c541 | 2009-12-13 15:53:05 +0100 | [diff] [blame] | 6 | * |
| 7 | * This library is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU Lesser General Public |
| 9 | * License as published by the Free Software Foundation, version 2.1 |
| 10 | * exclusively. |
| 11 | * |
| 12 | * This library is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * Lesser General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Lesser General Public |
| 18 | * License along with this library; if not, write to the Free Software |
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 20 | */ |
Willy Tarreau | baaee00 | 2006-06-26 02:48:02 +0200 | [diff] [blame] | 21 | |
Willy Tarreau | c7e4238 | 2012-08-24 19:22:53 +0200 | [diff] [blame] | 22 | #ifndef _PROTO_CHANNEL_H |
| 23 | #define _PROTO_CHANNEL_H |
Willy Tarreau | baaee00 | 2006-06-26 02:48:02 +0200 | [diff] [blame] | 24 | |
Willy Tarreau | 7341d94 | 2007-05-13 19:56:02 +0200 | [diff] [blame] | 25 | #include <stdio.h> |
Willy Tarreau | 0f77253 | 2006-12-23 20:51:41 +0100 | [diff] [blame] | 26 | #include <stdlib.h> |
Willy Tarreau | 7341d94 | 2007-05-13 19:56:02 +0200 | [diff] [blame] | 27 | #include <string.h> |
Willy Tarreau | 0f77253 | 2006-12-23 20:51:41 +0100 | [diff] [blame] | 28 | |
Willy Tarreau | e3ba5f0 | 2006-06-29 18:54:54 +0200 | [diff] [blame] | 29 | #include <common/config.h> |
Willy Tarreau | c7e4238 | 2012-08-24 19:22:53 +0200 | [diff] [blame] | 30 | #include <common/chunk.h> |
Willy Tarreau | 0c303ee | 2008-07-07 00:09:58 +0200 | [diff] [blame] | 31 | #include <common/ticks.h> |
Willy Tarreau | fa64558 | 2007-06-03 15:59:52 +0200 | [diff] [blame] | 32 | #include <common/time.h> |
| 33 | |
Thierry FOURNIER | ac836ba | 2014-12-16 15:41:18 +0100 | [diff] [blame] | 34 | #include <types/channel.h> |
Willy Tarreau | 7c3c541 | 2009-12-13 15:53:05 +0100 | [diff] [blame] | 35 | #include <types/global.h> |
Willy Tarreau | 87b0966 | 2015-04-03 00:22:06 +0200 | [diff] [blame] | 36 | #include <types/stream.h> |
Willy Tarreau | 7379653 | 2014-11-28 14:10:28 +0100 | [diff] [blame] | 37 | #include <types/stream_interface.h> |
Willy Tarreau | baaee00 | 2006-06-26 02:48:02 +0200 | [diff] [blame] | 38 | |
Willy Tarreau | 7341d94 | 2007-05-13 19:56:02 +0200 | [diff] [blame] | 39 | /* perform minimal intializations, report 0 in case of error, 1 if OK. */ |
Willy Tarreau | 8263d2b | 2012-08-28 00:06:31 +0200 | [diff] [blame] | 40 | int init_channel(); |
Willy Tarreau | 7341d94 | 2007-05-13 19:56:02 +0200 | [diff] [blame] | 41 | |
Willy Tarreau | 55a6906 | 2012-10-26 00:21:52 +0200 | [diff] [blame] | 42 | unsigned long long __channel_forward(struct channel *chn, unsigned long long bytes); |
Willy Tarreau | 8263d2b | 2012-08-28 00:06:31 +0200 | [diff] [blame] | 43 | |
| 44 | /* SI-to-channel functions working with buffers */ |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 45 | int bi_putblk(struct channel *chn, const char *str, int len); |
Willy Tarreau | b034b25 | 2014-12-08 18:14:53 +0100 | [diff] [blame] | 46 | struct buffer *bi_swpbuf(struct channel *chn, struct buffer *buf); |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 47 | int bi_putchr(struct channel *chn, char c); |
Thierry FOURNIER | ca16b03 | 2015-02-16 19:26:48 +0100 | [diff] [blame] | 48 | int bi_getline_nc(struct channel *chn, char **blk1, int *len1, char **blk2, int *len2); |
| 49 | int bi_getblk_nc(struct channel *chn, char **blk1, int *len1, char **blk2, int *len2); |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 50 | int bo_inject(struct channel *chn, const char *msg, int len); |
| 51 | int bo_getline(struct channel *chn, char *str, int len); |
| 52 | int bo_getblk(struct channel *chn, char *blk, int len, int offset); |
Thierry FOURNIER | ca16b03 | 2015-02-16 19:26:48 +0100 | [diff] [blame] | 53 | int bo_getline_nc(struct channel *chn, char **blk1, int *len1, char **blk2, int *len2); |
| 54 | int bo_getblk_nc(struct channel *chn, char **blk1, int *len1, char **blk2, int *len2); |
| 55 | |
Willy Tarreau | 74b08c9 | 2010-09-08 17:04:31 +0200 | [diff] [blame] | 56 | |
Willy Tarreau | 87b0966 | 2015-04-03 00:22:06 +0200 | [diff] [blame] | 57 | /* returns a pointer to the stream the channel belongs to */ |
Thierry FOURNIER | 27929fb | 2015-09-25 08:36:11 +0200 | [diff] [blame] | 58 | static inline struct stream *chn_strm(const struct channel *chn) |
Willy Tarreau | d5ccfa3 | 2014-12-28 13:03:53 +0100 | [diff] [blame] | 59 | { |
| 60 | if (chn->flags & CF_ISRESP) |
Willy Tarreau | 87b0966 | 2015-04-03 00:22:06 +0200 | [diff] [blame] | 61 | return LIST_ELEM(chn, struct stream *, res); |
Willy Tarreau | d5ccfa3 | 2014-12-28 13:03:53 +0100 | [diff] [blame] | 62 | else |
Willy Tarreau | 87b0966 | 2015-04-03 00:22:06 +0200 | [diff] [blame] | 63 | return LIST_ELEM(chn, struct stream *, req); |
Willy Tarreau | d5ccfa3 | 2014-12-28 13:03:53 +0100 | [diff] [blame] | 64 | } |
| 65 | |
Willy Tarreau | 7379653 | 2014-11-28 14:10:28 +0100 | [diff] [blame] | 66 | /* returns a pointer to the stream interface feeding the channel (producer) */ |
| 67 | static inline struct stream_interface *chn_prod(const struct channel *chn) |
| 68 | { |
Willy Tarreau | 5decc05 | 2014-11-28 14:22:12 +0100 | [diff] [blame] | 69 | if (chn->flags & CF_ISRESP) |
Willy Tarreau | 87b0966 | 2015-04-03 00:22:06 +0200 | [diff] [blame] | 70 | return &LIST_ELEM(chn, struct stream *, res)->si[1]; |
Willy Tarreau | 5decc05 | 2014-11-28 14:22:12 +0100 | [diff] [blame] | 71 | else |
Willy Tarreau | 87b0966 | 2015-04-03 00:22:06 +0200 | [diff] [blame] | 72 | return &LIST_ELEM(chn, struct stream *, req)->si[0]; |
Willy Tarreau | 7379653 | 2014-11-28 14:10:28 +0100 | [diff] [blame] | 73 | } |
| 74 | |
| 75 | /* returns a pointer to the stream interface consuming the channel (producer) */ |
| 76 | static inline struct stream_interface *chn_cons(const struct channel *chn) |
| 77 | { |
Willy Tarreau | 5decc05 | 2014-11-28 14:22:12 +0100 | [diff] [blame] | 78 | if (chn->flags & CF_ISRESP) |
Willy Tarreau | 87b0966 | 2015-04-03 00:22:06 +0200 | [diff] [blame] | 79 | return &LIST_ELEM(chn, struct stream *, res)->si[0]; |
Willy Tarreau | 5decc05 | 2014-11-28 14:22:12 +0100 | [diff] [blame] | 80 | else |
Willy Tarreau | 87b0966 | 2015-04-03 00:22:06 +0200 | [diff] [blame] | 81 | return &LIST_ELEM(chn, struct stream *, req)->si[1]; |
Willy Tarreau | 7379653 | 2014-11-28 14:10:28 +0100 | [diff] [blame] | 82 | } |
| 83 | |
Willy Tarreau | 8263d2b | 2012-08-28 00:06:31 +0200 | [diff] [blame] | 84 | /* Initialize all fields in the channel. */ |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 85 | static inline void channel_init(struct channel *chn) |
Willy Tarreau | 5446940 | 2006-07-29 16:59:06 +0200 | [diff] [blame] | 86 | { |
Willy Tarreau | 2a4b543 | 2014-11-24 11:39:34 +0100 | [diff] [blame] | 87 | chn->buf = &buf_empty; |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 88 | chn->to_forward = 0; |
Willy Tarreau | b145c78 | 2014-02-09 17:45:16 +0100 | [diff] [blame] | 89 | chn->last_read = now_ms; |
Willy Tarreau | 8f39dcd | 2014-02-09 08:31:49 +0100 | [diff] [blame] | 90 | chn->xfer_small = chn->xfer_large = 0; |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 91 | chn->total = 0; |
| 92 | chn->pipe = NULL; |
| 93 | chn->analysers = 0; |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 94 | chn->flags = 0; |
Willy Tarreau | 5446940 | 2006-07-29 16:59:06 +0200 | [diff] [blame] | 95 | } |
| 96 | |
Willy Tarreau | 55a6906 | 2012-10-26 00:21:52 +0200 | [diff] [blame] | 97 | /* Schedule up to <bytes> more bytes to be forwarded via the channel without |
| 98 | * notifying the owner task. Any data pending in the buffer are scheduled to be |
| 99 | * sent as well, in the limit of the number of bytes to forward. This must be |
| 100 | * the only method to use to schedule bytes to be forwarded. If the requested |
| 101 | * number is too large, it is automatically adjusted. The number of bytes taken |
| 102 | * into account is returned. Directly touching ->to_forward will cause lockups |
| 103 | * when buf->o goes down to zero if nobody is ready to push the remaining data. |
| 104 | */ |
| 105 | static inline unsigned long long channel_forward(struct channel *chn, unsigned long long bytes) |
| 106 | { |
| 107 | /* hint: avoid comparisons on long long for the fast case, since if the |
| 108 | * length does not fit in an unsigned it, it will never be forwarded at |
| 109 | * once anyway. |
| 110 | */ |
| 111 | if (bytes <= ~0U) { |
| 112 | unsigned int bytes32 = bytes; |
| 113 | |
| 114 | if (bytes32 <= chn->buf->i) { |
| 115 | /* OK this amount of bytes might be forwarded at once */ |
| 116 | b_adv(chn->buf, bytes32); |
| 117 | return bytes; |
| 118 | } |
| 119 | } |
| 120 | return __channel_forward(chn, bytes); |
| 121 | } |
| 122 | |
Willy Tarreau | 8263d2b | 2012-08-28 00:06:31 +0200 | [diff] [blame] | 123 | /*********************************************************************/ |
| 124 | /* These functions are used to compute various channel content sizes */ |
| 125 | /*********************************************************************/ |
Willy Tarreau | 4b517ca | 2011-11-25 20:33:58 +0100 | [diff] [blame] | 126 | |
Willy Tarreau | 8e21bb9 | 2012-08-24 22:40:29 +0200 | [diff] [blame] | 127 | /* Reports non-zero if the channel is empty, which means both its |
| 128 | * buffer and pipe are empty. The construct looks strange but is |
| 129 | * jump-less and much more efficient on both 32 and 64-bit than |
| 130 | * the boolean test. |
| 131 | */ |
| 132 | static inline unsigned int channel_is_empty(struct channel *c) |
| 133 | { |
Willy Tarreau | 9b28e03 | 2012-10-12 23:49:43 +0200 | [diff] [blame] | 134 | return !(c->buf->o | (long)c->pipe); |
Willy Tarreau | 8e21bb9 | 2012-08-24 22:40:29 +0200 | [diff] [blame] | 135 | } |
| 136 | |
Willy Tarreau | ba0902e | 2015-01-13 14:39:16 +0100 | [diff] [blame] | 137 | /* Returns non-zero if the channel is rewritable, which means that the buffer |
| 138 | * it is attached to has at least <maxrewrite> bytes immediately available. |
| 139 | * This is used to decide when a request or response may be parsed when some |
| 140 | * data from a previous exchange might still be present. |
Willy Tarreau | 379357a | 2013-06-08 12:55:46 +0200 | [diff] [blame] | 141 | */ |
Willy Tarreau | ba0902e | 2015-01-13 14:39:16 +0100 | [diff] [blame] | 142 | static inline int channel_is_rewritable(const struct channel *chn) |
Willy Tarreau | 379357a | 2013-06-08 12:55:46 +0200 | [diff] [blame] | 143 | { |
| 144 | int rem = chn->buf->size; |
| 145 | |
| 146 | rem -= chn->buf->o; |
| 147 | rem -= chn->buf->i; |
| 148 | rem -= global.tune.maxrewrite; |
| 149 | return rem >= 0; |
| 150 | } |
| 151 | |
Willy Tarreau | 9c06ee4 | 2015-01-14 16:08:45 +0100 | [diff] [blame] | 152 | /* Tells whether data are likely to leave the buffer. This is used to know when |
| 153 | * we can safely ignore the reserve since we know we cannot retry a connection. |
| 154 | * It returns zero if data are blocked, non-zero otherwise. |
| 155 | */ |
| 156 | static inline int channel_may_send(const struct channel *chn) |
| 157 | { |
Willy Tarreau | 7379653 | 2014-11-28 14:10:28 +0100 | [diff] [blame] | 158 | return chn_cons(chn)->state == SI_ST_EST; |
Willy Tarreau | 9c06ee4 | 2015-01-14 16:08:45 +0100 | [diff] [blame] | 159 | } |
| 160 | |
Willy Tarreau | 3889fff | 2015-01-13 20:20:10 +0100 | [diff] [blame] | 161 | /* Returns non-zero if the channel can still receive data. This is used to |
Willy Tarreau | 379357a | 2013-06-08 12:55:46 +0200 | [diff] [blame] | 162 | * decide when to stop reading into a buffer when we want to ensure that we |
| 163 | * leave the reserve untouched after all pending outgoing data are forwarded. |
| 164 | * The reserved space is taken into account if ->to_forward indicates that an |
| 165 | * end of transfer is close to happen. Note that both ->buf->o and ->to_forward |
| 166 | * are considered as available since they're supposed to leave the buffer. The |
| 167 | * test is optimized to avoid as many operations as possible for the fast case |
Willy Tarreau | 4b46a3e | 2016-04-20 20:09:22 +0200 | [diff] [blame] | 168 | * and to be used as an "if" condition. Just like channel_recv_limit(), we |
| 169 | * never allow to overwrite the reserve until the output stream interface is |
| 170 | * connected, otherwise we could spin on a POST with http-send-name-header. |
Willy Tarreau | 4b517ca | 2011-11-25 20:33:58 +0100 | [diff] [blame] | 171 | */ |
Willy Tarreau | 3889fff | 2015-01-13 20:20:10 +0100 | [diff] [blame] | 172 | static inline int channel_may_recv(const struct channel *chn) |
Willy Tarreau | 4b517ca | 2011-11-25 20:33:58 +0100 | [diff] [blame] | 173 | { |
Willy Tarreau | 9b28e03 | 2012-10-12 23:49:43 +0200 | [diff] [blame] | 174 | int rem = chn->buf->size; |
Willy Tarreau | 9dab5fc | 2012-05-07 11:56:55 +0200 | [diff] [blame] | 175 | |
Willy Tarreau | 4428a29 | 2014-11-28 20:54:13 +0100 | [diff] [blame] | 176 | if (chn->buf == &buf_empty) |
Willy Tarreau | 3889fff | 2015-01-13 20:20:10 +0100 | [diff] [blame] | 177 | return 1; |
Willy Tarreau | 4428a29 | 2014-11-28 20:54:13 +0100 | [diff] [blame] | 178 | |
Willy Tarreau | 9b28e03 | 2012-10-12 23:49:43 +0200 | [diff] [blame] | 179 | rem -= chn->buf->o; |
| 180 | rem -= chn->buf->i; |
Willy Tarreau | 9dab5fc | 2012-05-07 11:56:55 +0200 | [diff] [blame] | 181 | if (!rem) |
Willy Tarreau | 3889fff | 2015-01-13 20:20:10 +0100 | [diff] [blame] | 182 | return 0; /* buffer already full */ |
Willy Tarreau | 9dab5fc | 2012-05-07 11:56:55 +0200 | [diff] [blame] | 183 | |
Willy Tarreau | 93dc478 | 2016-04-21 12:12:45 +0200 | [diff] [blame] | 184 | if (rem > global.tune.maxrewrite) |
| 185 | return 1; /* reserve not yet reached */ |
Willy Tarreau | 4b46a3e | 2016-04-20 20:09:22 +0200 | [diff] [blame] | 186 | |
Willy Tarreau | 93dc478 | 2016-04-21 12:12:45 +0200 | [diff] [blame] | 187 | if (!channel_may_send(chn)) |
| 188 | return 0; /* don't touch reserve until we can send */ |
Willy Tarreau | 9dab5fc | 2012-05-07 11:56:55 +0200 | [diff] [blame] | 189 | |
Willy Tarreau | 93dc478 | 2016-04-21 12:12:45 +0200 | [diff] [blame] | 190 | /* Now we know there's some room left in the reserve and we may |
| 191 | * forward. As long as i-to_fwd < size-maxrw, we may still |
| 192 | * receive. This is equivalent to i+maxrw-size < to_fwd, |
| 193 | * which is logical since i+maxrw-size is what overlaps with |
| 194 | * the reserve, and we want to ensure they're covered by scheduled |
| 195 | * forwards. |
| 196 | */ |
| 197 | rem = chn->buf->i + global.tune.maxrewrite - chn->buf->size; |
| 198 | return rem < 0 || (unsigned int)rem < chn->to_forward; |
Willy Tarreau | 4b517ca | 2011-11-25 20:33:58 +0100 | [diff] [blame] | 199 | } |
| 200 | |
Willy Tarreau | 8263d2b | 2012-08-28 00:06:31 +0200 | [diff] [blame] | 201 | /* Returns true if the channel's input is already closed */ |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 202 | static inline int channel_input_closed(struct channel *chn) |
Willy Tarreau | 74b08c9 | 2010-09-08 17:04:31 +0200 | [diff] [blame] | 203 | { |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 204 | return ((chn->flags & CF_SHUTR) != 0); |
Willy Tarreau | 74b08c9 | 2010-09-08 17:04:31 +0200 | [diff] [blame] | 205 | } |
| 206 | |
Willy Tarreau | 8263d2b | 2012-08-28 00:06:31 +0200 | [diff] [blame] | 207 | /* Returns true if the channel's output is already closed */ |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 208 | static inline int channel_output_closed(struct channel *chn) |
Willy Tarreau | 74b08c9 | 2010-09-08 17:04:31 +0200 | [diff] [blame] | 209 | { |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 210 | return ((chn->flags & CF_SHUTW) != 0); |
Willy Tarreau | 74b08c9 | 2010-09-08 17:04:31 +0200 | [diff] [blame] | 211 | } |
| 212 | |
Willy Tarreau | 8263d2b | 2012-08-28 00:06:31 +0200 | [diff] [blame] | 213 | /* Check channel timeouts, and set the corresponding flags. The likely/unlikely |
| 214 | * have been optimized for fastest normal path. The read/write timeouts are not |
| 215 | * set if there was activity on the channel. That way, we don't have to update |
| 216 | * the timeout on every I/O. Note that the analyser timeout is always checked. |
Willy Tarreau | 2eb52f0 | 2008-09-04 09:14:08 +0200 | [diff] [blame] | 217 | */ |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 218 | static inline void channel_check_timeouts(struct channel *chn) |
Willy Tarreau | 2eb52f0 | 2008-09-04 09:14:08 +0200 | [diff] [blame] | 219 | { |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 220 | if (likely(!(chn->flags & (CF_SHUTR|CF_READ_TIMEOUT|CF_READ_ACTIVITY|CF_READ_NOEXP))) && |
| 221 | unlikely(tick_is_expired(chn->rex, now_ms))) |
| 222 | chn->flags |= CF_READ_TIMEOUT; |
Willy Tarreau | 2eb52f0 | 2008-09-04 09:14:08 +0200 | [diff] [blame] | 223 | |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 224 | if (likely(!(chn->flags & (CF_SHUTW|CF_WRITE_TIMEOUT|CF_WRITE_ACTIVITY))) && |
| 225 | unlikely(tick_is_expired(chn->wex, now_ms))) |
| 226 | chn->flags |= CF_WRITE_TIMEOUT; |
Willy Tarreau | 2eb52f0 | 2008-09-04 09:14:08 +0200 | [diff] [blame] | 227 | |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 228 | if (likely(!(chn->flags & CF_ANA_TIMEOUT)) && |
| 229 | unlikely(tick_is_expired(chn->analyse_exp, now_ms))) |
| 230 | chn->flags |= CF_ANA_TIMEOUT; |
Willy Tarreau | 2eb52f0 | 2008-09-04 09:14:08 +0200 | [diff] [blame] | 231 | } |
| 232 | |
Willy Tarreau | 8263d2b | 2012-08-28 00:06:31 +0200 | [diff] [blame] | 233 | /* Erase any content from channel <buf> and adjusts flags accordingly. Note |
Willy Tarreau | 0abebcc | 2009-01-08 00:09:41 +0100 | [diff] [blame] | 234 | * that any spliced data is not affected since we may not have any access to |
| 235 | * it. |
Willy Tarreau | e393fe2 | 2008-08-16 22:18:07 +0200 | [diff] [blame] | 236 | */ |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 237 | static inline void channel_erase(struct channel *chn) |
Willy Tarreau | baaee00 | 2006-06-26 02:48:02 +0200 | [diff] [blame] | 238 | { |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 239 | chn->to_forward = 0; |
Willy Tarreau | 474cf54 | 2014-11-24 10:54:47 +0100 | [diff] [blame] | 240 | b_reset(chn->buf); |
Willy Tarreau | baaee00 | 2006-06-26 02:48:02 +0200 | [diff] [blame] | 241 | } |
| 242 | |
Willy Tarreau | 8263d2b | 2012-08-28 00:06:31 +0200 | [diff] [blame] | 243 | /* marks the channel as "shutdown" ASAP for reads */ |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 244 | static inline void channel_shutr_now(struct channel *chn) |
Willy Tarreau | fa7e102 | 2008-10-19 07:30:41 +0200 | [diff] [blame] | 245 | { |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 246 | chn->flags |= CF_SHUTR_NOW; |
Willy Tarreau | fa7e102 | 2008-10-19 07:30:41 +0200 | [diff] [blame] | 247 | } |
| 248 | |
Willy Tarreau | 8263d2b | 2012-08-28 00:06:31 +0200 | [diff] [blame] | 249 | /* marks the channel as "shutdown" ASAP for writes */ |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 250 | static inline void channel_shutw_now(struct channel *chn) |
Willy Tarreau | fa7e102 | 2008-10-19 07:30:41 +0200 | [diff] [blame] | 251 | { |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 252 | chn->flags |= CF_SHUTW_NOW; |
Willy Tarreau | fa7e102 | 2008-10-19 07:30:41 +0200 | [diff] [blame] | 253 | } |
| 254 | |
Willy Tarreau | 8263d2b | 2012-08-28 00:06:31 +0200 | [diff] [blame] | 255 | /* marks the channel as "shutdown" ASAP in both directions */ |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 256 | static inline void channel_abort(struct channel *chn) |
Willy Tarreau | fa7e102 | 2008-10-19 07:30:41 +0200 | [diff] [blame] | 257 | { |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 258 | chn->flags |= CF_SHUTR_NOW | CF_SHUTW_NOW; |
| 259 | chn->flags &= ~CF_AUTO_CONNECT; |
Willy Tarreau | fa7e102 | 2008-10-19 07:30:41 +0200 | [diff] [blame] | 260 | } |
| 261 | |
Willy Tarreau | 520d95e | 2009-09-19 21:04:57 +0200 | [diff] [blame] | 262 | /* allow the consumer to try to establish a new connection. */ |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 263 | static inline void channel_auto_connect(struct channel *chn) |
Willy Tarreau | 3da77c5 | 2008-08-29 09:58:42 +0200 | [diff] [blame] | 264 | { |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 265 | chn->flags |= CF_AUTO_CONNECT; |
Willy Tarreau | 3da77c5 | 2008-08-29 09:58:42 +0200 | [diff] [blame] | 266 | } |
| 267 | |
Willy Tarreau | 520d95e | 2009-09-19 21:04:57 +0200 | [diff] [blame] | 268 | /* prevent the consumer from trying to establish a new connection, and also |
| 269 | * disable auto shutdown forwarding. |
| 270 | */ |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 271 | static inline void channel_dont_connect(struct channel *chn) |
Willy Tarreau | 3da77c5 | 2008-08-29 09:58:42 +0200 | [diff] [blame] | 272 | { |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 273 | chn->flags &= ~(CF_AUTO_CONNECT|CF_AUTO_CLOSE); |
Willy Tarreau | 3da77c5 | 2008-08-29 09:58:42 +0200 | [diff] [blame] | 274 | } |
| 275 | |
Willy Tarreau | 520d95e | 2009-09-19 21:04:57 +0200 | [diff] [blame] | 276 | /* allow the producer to forward shutdown requests */ |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 277 | static inline void channel_auto_close(struct channel *chn) |
Willy Tarreau | 0a5d5dd | 2008-11-23 19:31:35 +0100 | [diff] [blame] | 278 | { |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 279 | chn->flags |= CF_AUTO_CLOSE; |
Willy Tarreau | 0a5d5dd | 2008-11-23 19:31:35 +0100 | [diff] [blame] | 280 | } |
| 281 | |
Willy Tarreau | 520d95e | 2009-09-19 21:04:57 +0200 | [diff] [blame] | 282 | /* prevent the producer from forwarding shutdown requests */ |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 283 | static inline void channel_dont_close(struct channel *chn) |
Willy Tarreau | 0a5d5dd | 2008-11-23 19:31:35 +0100 | [diff] [blame] | 284 | { |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 285 | chn->flags &= ~CF_AUTO_CLOSE; |
Willy Tarreau | 0a5d5dd | 2008-11-23 19:31:35 +0100 | [diff] [blame] | 286 | } |
| 287 | |
Willy Tarreau | 90deb18 | 2010-01-07 00:20:41 +0100 | [diff] [blame] | 288 | /* allow the producer to read / poll the input */ |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 289 | static inline void channel_auto_read(struct channel *chn) |
Willy Tarreau | 90deb18 | 2010-01-07 00:20:41 +0100 | [diff] [blame] | 290 | { |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 291 | chn->flags &= ~CF_DONT_READ; |
Willy Tarreau | 90deb18 | 2010-01-07 00:20:41 +0100 | [diff] [blame] | 292 | } |
| 293 | |
| 294 | /* prevent the producer from read / poll the input */ |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 295 | static inline void channel_dont_read(struct channel *chn) |
Willy Tarreau | 90deb18 | 2010-01-07 00:20:41 +0100 | [diff] [blame] | 296 | { |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 297 | chn->flags |= CF_DONT_READ; |
Willy Tarreau | 90deb18 | 2010-01-07 00:20:41 +0100 | [diff] [blame] | 298 | } |
| 299 | |
Willy Tarreau | 8263d2b | 2012-08-28 00:06:31 +0200 | [diff] [blame] | 300 | |
| 301 | /*************************************************/ |
| 302 | /* Buffer operations in the context of a channel */ |
| 303 | /*************************************************/ |
| 304 | |
Willy Tarreau | 8263d2b | 2012-08-28 00:06:31 +0200 | [diff] [blame] | 305 | |
| 306 | /* Return the max number of bytes the buffer can contain so that once all the |
Willy Tarreau | 169c470 | 2016-04-20 18:05:17 +0200 | [diff] [blame] | 307 | * pending bytes are forwarded, the buffer still has global.tune.maxrewrite |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 308 | * bytes free. The result sits between chn->size - maxrewrite and chn->size. |
Willy Tarreau | 169c470 | 2016-04-20 18:05:17 +0200 | [diff] [blame] | 309 | * It is important to mention that if buf->i is already larger than size-maxrw |
| 310 | * the condition above cannot be satisfied and the lowest size will be returned |
| 311 | * anyway. The principles are the following : |
| 312 | * 0) the empty buffer has a limit of zero |
| 313 | * 1) a non-connected buffer cannot touch the reserve |
| 314 | * 2) infinite forward can always fill the buffer since all data will leave |
| 315 | * 3) all output bytes are considered in transit since they're leaving |
| 316 | * 4) all input bytes covered by to_forward are considered in transit since |
| 317 | * they'll be converted to output bytes. |
| 318 | * 5) all input bytes not covered by to_forward as considered remaining |
| 319 | * 6) all bytes scheduled to be forwarded minus what is already in the input |
| 320 | * buffer will be in transit during future rounds. |
| 321 | * 7) 4+5+6 imply that the amount of input bytes (i) is irrelevant to the max |
| 322 | * usable length, only to_forward and output count. The difference is |
| 323 | * visible when to_forward > i. |
| 324 | * 8) the reserve may be covered up to the amount of bytes in transit since |
| 325 | * these bytes will only take temporary space. |
Willy Tarreau | 999f643 | 2016-01-25 01:09:11 +0100 | [diff] [blame] | 326 | * |
Willy Tarreau | 169c470 | 2016-04-20 18:05:17 +0200 | [diff] [blame] | 327 | * A typical buffer looks like this : |
Willy Tarreau | 999f643 | 2016-01-25 01:09:11 +0100 | [diff] [blame] | 328 | * |
Willy Tarreau | 169c470 | 2016-04-20 18:05:17 +0200 | [diff] [blame] | 329 | * <-------------- max_len -----------> |
| 330 | * <---- o ----><----- i -----> <--- 0..maxrewrite ---> |
| 331 | * +------------+--------------+-------+----------------------+ |
| 332 | * |////////////|\\\\\\\\\\\\\\|xxxxxxx| reserve | |
| 333 | * +------------+--------+-----+-------+----------------------+ |
| 334 | * <- fwd -> <-avail-> |
| 335 | * |
| 336 | * Or when to_forward > i : |
| 337 | * |
| 338 | * <-------------- max_len -----------> |
| 339 | * <---- o ----><----- i -----> <--- 0..maxrewrite ---> |
| 340 | * +------------+--------------+-------+----------------------+ |
| 341 | * |////////////|\\\\\\\\\\\\\\|xxxxxxx| reserve | |
| 342 | * +------------+--------+-----+-------+----------------------+ |
| 343 | * <-avail-> |
| 344 | * <------------------ fwd ----------------> |
| 345 | * |
| 346 | * - the amount of buffer bytes in transit is : min(i, fwd) + o |
| 347 | * - some scheduled bytes may be in transit (up to fwd - i) |
| 348 | * - the reserve is max(0, maxrewrite - transit) |
| 349 | * - the maximum usable buffer length is size - reserve. |
| 350 | * - the available space is max_len - i - o |
| 351 | * |
| 352 | * So the formula to compute the buffer's maximum length to protect the reserve |
| 353 | * when reading new data is : |
| 354 | * |
| 355 | * max = size - maxrewrite + min(maxrewrite, transit) |
| 356 | * = size - max(maxrewrite - transit, 0) |
| 357 | * |
| 358 | * But WARNING! The conditions might change during the transfer and it could |
| 359 | * very well happen that a buffer would contain more bytes than max_len due to |
| 360 | * i+o already walking over the reserve (eg: after a header rewrite), including |
| 361 | * i or o alone hitting the limit. So it is critical to always consider that |
| 362 | * bounds may have already been crossed and that available space may be negative |
| 363 | * for example. Due to this it is perfectly possible for this function to return |
| 364 | * a value that is lower than current i+o. |
Willy Tarreau | 8263d2b | 2012-08-28 00:06:31 +0200 | [diff] [blame] | 365 | */ |
Willy Tarreau | 3f5096d | 2015-01-14 20:21:43 +0100 | [diff] [blame] | 366 | static inline int channel_recv_limit(const struct channel *chn) |
Willy Tarreau | 8263d2b | 2012-08-28 00:06:31 +0200 | [diff] [blame] | 367 | { |
Willy Tarreau | 999f643 | 2016-01-25 01:09:11 +0100 | [diff] [blame] | 368 | int reserve; |
| 369 | |
| 370 | /* return zero if empty */ |
| 371 | reserve = chn->buf->size; |
| 372 | if (chn->buf == &buf_empty) |
| 373 | goto end; |
| 374 | |
| 375 | /* return size - maxrewrite if we can't send */ |
| 376 | reserve = global.tune.maxrewrite; |
| 377 | if (unlikely(!channel_may_send(chn))) |
| 378 | goto end; |
| 379 | |
Willy Tarreau | 169c470 | 2016-04-20 18:05:17 +0200 | [diff] [blame] | 380 | /* chn->to_forward may cause an integer underflow when equal to |
| 381 | * CHN_INFINITE_FORWARD but we check for it afterwards as it produces |
| 382 | * quite better assembly code in this sensitive code path. |
Willy Tarreau | 999f643 | 2016-01-25 01:09:11 +0100 | [diff] [blame] | 383 | */ |
Willy Tarreau | 169c470 | 2016-04-20 18:05:17 +0200 | [diff] [blame] | 384 | reserve = global.tune.maxrewrite - chn->buf->o - chn->to_forward; |
| 385 | if (chn->to_forward == CHN_INFINITE_FORWARD || reserve < 0) |
| 386 | return chn->buf->size; |
Willy Tarreau | 999f643 | 2016-01-25 01:09:11 +0100 | [diff] [blame] | 387 | end: |
| 388 | return chn->buf->size - reserve; |
Willy Tarreau | 8263d2b | 2012-08-28 00:06:31 +0200 | [diff] [blame] | 389 | } |
| 390 | |
Willy Tarreau | 8263d2b | 2012-08-28 00:06:31 +0200 | [diff] [blame] | 391 | /* Returns the amount of space available at the input of the buffer, taking the |
| 392 | * reserved space into account if ->to_forward indicates that an end of transfer |
| 393 | * is close to happen. The test is optimized to avoid as many operations as |
| 394 | * possible for the fast case. |
| 395 | */ |
Willy Tarreau | b5051f8 | 2015-01-14 20:25:34 +0100 | [diff] [blame] | 396 | static inline int channel_recv_max(const struct channel *chn) |
Willy Tarreau | 8263d2b | 2012-08-28 00:06:31 +0200 | [diff] [blame] | 397 | { |
Willy Tarreau | 27bb0e1 | 2015-01-14 15:56:50 +0100 | [diff] [blame] | 398 | int ret; |
Willy Tarreau | 8263d2b | 2012-08-28 00:06:31 +0200 | [diff] [blame] | 399 | |
Willy Tarreau | 3f5096d | 2015-01-14 20:21:43 +0100 | [diff] [blame] | 400 | ret = channel_recv_limit(chn) - chn->buf->i - chn->buf->o; |
Willy Tarreau | 27bb0e1 | 2015-01-14 15:56:50 +0100 | [diff] [blame] | 401 | if (ret < 0) |
| 402 | ret = 0; |
| 403 | return ret; |
Willy Tarreau | 8263d2b | 2012-08-28 00:06:31 +0200 | [diff] [blame] | 404 | } |
| 405 | |
Willy Tarreau | 319f745 | 2015-01-14 20:32:59 +0100 | [diff] [blame] | 406 | /* Truncate any unread data in the channel's buffer, and disable forwarding. |
| 407 | * Outgoing data are left intact. This is mainly to be used to send error |
| 408 | * messages after existing data. |
Willy Tarreau | 8263d2b | 2012-08-28 00:06:31 +0200 | [diff] [blame] | 409 | */ |
Willy Tarreau | 319f745 | 2015-01-14 20:32:59 +0100 | [diff] [blame] | 410 | static inline void channel_truncate(struct channel *chn) |
Willy Tarreau | 8263d2b | 2012-08-28 00:06:31 +0200 | [diff] [blame] | 411 | { |
Willy Tarreau | 9b28e03 | 2012-10-12 23:49:43 +0200 | [diff] [blame] | 412 | if (!chn->buf->o) |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 413 | return channel_erase(chn); |
Willy Tarreau | 8263d2b | 2012-08-28 00:06:31 +0200 | [diff] [blame] | 414 | |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 415 | chn->to_forward = 0; |
Willy Tarreau | 9b28e03 | 2012-10-12 23:49:43 +0200 | [diff] [blame] | 416 | if (!chn->buf->i) |
Willy Tarreau | 8263d2b | 2012-08-28 00:06:31 +0200 | [diff] [blame] | 417 | return; |
| 418 | |
Willy Tarreau | 9b28e03 | 2012-10-12 23:49:43 +0200 | [diff] [blame] | 419 | chn->buf->i = 0; |
Willy Tarreau | 8263d2b | 2012-08-28 00:06:31 +0200 | [diff] [blame] | 420 | } |
| 421 | |
Willy Tarreau | baaee00 | 2006-06-26 02:48:02 +0200 | [diff] [blame] | 422 | /* |
Willy Tarreau | 8263d2b | 2012-08-28 00:06:31 +0200 | [diff] [blame] | 423 | * Advance the channel buffer's read pointer by <len> bytes. This is useful |
| 424 | * when data have been read directly from the buffer. It is illegal to call |
| 425 | * this function with <len> causing a wrapping at the end of the buffer. It's |
| 426 | * the caller's responsibility to ensure that <len> is never larger than |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 427 | * chn->o. Channel flag WRITE_PARTIAL is set. |
Willy Tarreau | 2b7addc | 2009-08-31 07:37:22 +0200 | [diff] [blame] | 428 | */ |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 429 | static inline void bo_skip(struct channel *chn, int len) |
Willy Tarreau | 2b7addc | 2009-08-31 07:37:22 +0200 | [diff] [blame] | 430 | { |
Willy Tarreau | 9b28e03 | 2012-10-12 23:49:43 +0200 | [diff] [blame] | 431 | chn->buf->o -= len; |
Willy Tarreau | 9dab5fc | 2012-05-07 11:56:55 +0200 | [diff] [blame] | 432 | |
Willy Tarreau | 5fb3803 | 2012-12-16 19:39:09 +0100 | [diff] [blame] | 433 | if (buffer_empty(chn->buf)) |
Willy Tarreau | 9b28e03 | 2012-10-12 23:49:43 +0200 | [diff] [blame] | 434 | chn->buf->p = chn->buf->data; |
Willy Tarreau | 2b7addc | 2009-08-31 07:37:22 +0200 | [diff] [blame] | 435 | |
Willy Tarreau | fb0e920 | 2009-09-23 23:47:55 +0200 | [diff] [blame] | 436 | /* notify that some data was written to the SI from the buffer */ |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 437 | chn->flags |= CF_WRITE_PARTIAL; |
Willy Tarreau | 2b7addc | 2009-08-31 07:37:22 +0200 | [diff] [blame] | 438 | } |
Willy Tarreau | baaee00 | 2006-06-26 02:48:02 +0200 | [diff] [blame] | 439 | |
Willy Tarreau | 8263d2b | 2012-08-28 00:06:31 +0200 | [diff] [blame] | 440 | /* Tries to copy chunk <chunk> into the channel's buffer after length controls. |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 441 | * The chn->o and to_forward pointers are updated. If the channel's input is |
Willy Tarreau | 74b08c9 | 2010-09-08 17:04:31 +0200 | [diff] [blame] | 442 | * closed, -2 is returned. If the block is too large for this buffer, -3 is |
| 443 | * returned. If there is not enough room left in the buffer, -1 is returned. |
| 444 | * Otherwise the number of bytes copied is returned (0 being a valid number). |
Willy Tarreau | 8263d2b | 2012-08-28 00:06:31 +0200 | [diff] [blame] | 445 | * Channel flag READ_PARTIAL is updated if some data can be transferred. The |
Willy Tarreau | f941cf2 | 2012-08-27 20:53:34 +0200 | [diff] [blame] | 446 | * chunk's length is updated with the number of bytes sent. |
Willy Tarreau | aeac319 | 2009-08-31 08:09:57 +0200 | [diff] [blame] | 447 | */ |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 448 | static inline int bi_putchk(struct channel *chn, struct chunk *chunk) |
Willy Tarreau | aeac319 | 2009-08-31 08:09:57 +0200 | [diff] [blame] | 449 | { |
| 450 | int ret; |
| 451 | |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 452 | ret = bi_putblk(chn, chunk->str, chunk->len); |
Willy Tarreau | 74b08c9 | 2010-09-08 17:04:31 +0200 | [diff] [blame] | 453 | if (ret > 0) |
| 454 | chunk->len -= ret; |
Willy Tarreau | aeac319 | 2009-08-31 08:09:57 +0200 | [diff] [blame] | 455 | return ret; |
| 456 | } |
| 457 | |
Willy Tarreau | 8263d2b | 2012-08-28 00:06:31 +0200 | [diff] [blame] | 458 | /* Tries to copy string <str> at once into the channel's buffer after length |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 459 | * controls. The chn->o and to_forward pointers are updated. If the channel's |
Willy Tarreau | 8263d2b | 2012-08-28 00:06:31 +0200 | [diff] [blame] | 460 | * input is closed, -2 is returned. If the block is too large for this buffer, |
| 461 | * -3 is returned. If there is not enough room left in the buffer, -1 is |
| 462 | * returned. Otherwise the number of bytes copied is returned (0 being a valid |
| 463 | * number). Channel flag READ_PARTIAL is updated if some data can be |
| 464 | * transferred. |
Willy Tarreau | 74b08c9 | 2010-09-08 17:04:31 +0200 | [diff] [blame] | 465 | */ |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 466 | static inline int bi_putstr(struct channel *chn, const char *str) |
Willy Tarreau | 74b08c9 | 2010-09-08 17:04:31 +0200 | [diff] [blame] | 467 | { |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 468 | return bi_putblk(chn, str, strlen(str)); |
Willy Tarreau | 74b08c9 | 2010-09-08 17:04:31 +0200 | [diff] [blame] | 469 | } |
| 470 | |
| 471 | /* |
Willy Tarreau | 8263d2b | 2012-08-28 00:06:31 +0200 | [diff] [blame] | 472 | * Return one char from the channel's buffer. If the buffer is empty and the |
| 473 | * channel is closed, return -2. If the buffer is just empty, return -1. The |
| 474 | * buffer's pointer is not advanced, it's up to the caller to call bo_skip(buf, |
| 475 | * 1) when it has consumed the char. Also note that this function respects the |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 476 | * chn->o limit. |
Willy Tarreau | 74b08c9 | 2010-09-08 17:04:31 +0200 | [diff] [blame] | 477 | */ |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 478 | static inline int bo_getchr(struct channel *chn) |
Willy Tarreau | 74b08c9 | 2010-09-08 17:04:31 +0200 | [diff] [blame] | 479 | { |
| 480 | /* closed or empty + imminent close = -2; empty = -1 */ |
Willy Tarreau | 974ced6 | 2012-10-12 23:11:02 +0200 | [diff] [blame] | 481 | if (unlikely((chn->flags & CF_SHUTW) || channel_is_empty(chn))) { |
| 482 | if (chn->flags & (CF_SHUTW|CF_SHUTW_NOW)) |
Willy Tarreau | 74b08c9 | 2010-09-08 17:04:31 +0200 | [diff] [blame] | 483 | return -2; |
| 484 | return -1; |
| 485 | } |
Willy Tarreau | 9b28e03 | 2012-10-12 23:49:43 +0200 | [diff] [blame] | 486 | return *buffer_wrap_sub(chn->buf, chn->buf->p - chn->buf->o); |
Willy Tarreau | 74b08c9 | 2010-09-08 17:04:31 +0200 | [diff] [blame] | 487 | } |
| 488 | |
Willy Tarreau | baaee00 | 2006-06-26 02:48:02 +0200 | [diff] [blame] | 489 | |
Willy Tarreau | c7e4238 | 2012-08-24 19:22:53 +0200 | [diff] [blame] | 490 | #endif /* _PROTO_CHANNEL_H */ |
Willy Tarreau | baaee00 | 2006-06-26 02:48:02 +0200 | [diff] [blame] | 491 | |
| 492 | /* |
| 493 | * Local variables: |
| 494 | * c-indent-level: 8 |
| 495 | * c-basic-offset: 8 |
| 496 | * End: |
| 497 | */ |