David 'Digit' Turner | 6d44880 | 2010-11-18 16:14:03 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2010 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | #include "android/async-utils.h" |
David 'Digit' Turner | af81d74 | 2014-02-03 17:11:18 +0100 | [diff] [blame] | 17 | #include "android/utils/eintr_wrapper.h" |
David 'Digit' Turner | 6d44880 | 2010-11-18 16:14:03 +0100 | [diff] [blame] | 18 | #include "unistd.h" |
| 19 | |
| 20 | void |
| 21 | asyncReader_init(AsyncReader* ar, |
| 22 | void* buffer, |
| 23 | size_t buffsize, |
| 24 | LoopIo* io) |
| 25 | { |
| 26 | ar->buffer = buffer; |
| 27 | ar->buffsize = buffsize; |
| 28 | ar->pos = 0; |
Vladimir Chtchetkine | db611d5 | 2011-11-01 17:35:07 -0700 | [diff] [blame] | 29 | ar->io = io; |
David 'Digit' Turner | 6d44880 | 2010-11-18 16:14:03 +0100 | [diff] [blame] | 30 | if (buffsize > 0) |
| 31 | loopIo_wantRead(io); |
| 32 | } |
| 33 | |
| 34 | AsyncStatus |
David 'Digit' Turner | f9e333a | 2011-03-17 14:57:51 +0100 | [diff] [blame] | 35 | asyncReader_read(AsyncReader* ar) |
David 'Digit' Turner | 6d44880 | 2010-11-18 16:14:03 +0100 | [diff] [blame] | 36 | { |
| 37 | int ret; |
| 38 | |
| 39 | if (ar->pos >= ar->buffsize) { |
| 40 | return ASYNC_COMPLETE; |
| 41 | } |
| 42 | |
| 43 | do { |
David 'Digit' Turner | af81d74 | 2014-02-03 17:11:18 +0100 | [diff] [blame] | 44 | ret = HANDLE_EINTR( |
| 45 | socket_recv(ar->io->fd, |
| 46 | ar->buffer + ar->pos, |
| 47 | ar->buffsize - ar->pos)); |
David 'Digit' Turner | 6d44880 | 2010-11-18 16:14:03 +0100 | [diff] [blame] | 48 | if (ret == 0) { |
| 49 | /* disconnection ! */ |
| 50 | errno = ECONNRESET; |
| 51 | return ASYNC_ERROR; |
| 52 | } |
| 53 | if (ret < 0) { |
David 'Digit' Turner | 6d44880 | 2010-11-18 16:14:03 +0100 | [diff] [blame] | 54 | if (errno == EWOULDBLOCK || errno == EAGAIN) { |
David 'Digit' Turner | f9e333a | 2011-03-17 14:57:51 +0100 | [diff] [blame] | 55 | loopIo_wantRead(ar->io); |
David 'Digit' Turner | 6d44880 | 2010-11-18 16:14:03 +0100 | [diff] [blame] | 56 | return ASYNC_NEED_MORE; |
| 57 | } |
| 58 | return ASYNC_ERROR; |
| 59 | } |
| 60 | ar->pos += ret; |
| 61 | |
| 62 | } while (ar->pos < ar->buffsize); |
| 63 | |
David 'Digit' Turner | f9e333a | 2011-03-17 14:57:51 +0100 | [diff] [blame] | 64 | loopIo_dontWantRead(ar->io); |
David 'Digit' Turner | 6d44880 | 2010-11-18 16:14:03 +0100 | [diff] [blame] | 65 | return ASYNC_COMPLETE; |
| 66 | } |
| 67 | |
| 68 | void |
| 69 | asyncWriter_init(AsyncWriter* aw, |
| 70 | const void* buffer, |
| 71 | size_t buffsize, |
| 72 | LoopIo* io) |
| 73 | { |
| 74 | aw->buffer = buffer; |
| 75 | aw->buffsize = buffsize; |
| 76 | aw->pos = 0; |
Vladimir Chtchetkine | db611d5 | 2011-11-01 17:35:07 -0700 | [diff] [blame] | 77 | aw->io = io; |
David 'Digit' Turner | 6d44880 | 2010-11-18 16:14:03 +0100 | [diff] [blame] | 78 | if (buffsize > 0) |
| 79 | loopIo_wantWrite(io); |
| 80 | } |
| 81 | |
| 82 | AsyncStatus |
David 'Digit' Turner | f9e333a | 2011-03-17 14:57:51 +0100 | [diff] [blame] | 83 | asyncWriter_write(AsyncWriter* aw) |
David 'Digit' Turner | 6d44880 | 2010-11-18 16:14:03 +0100 | [diff] [blame] | 84 | { |
| 85 | int ret; |
| 86 | |
| 87 | if (aw->pos >= aw->buffsize) { |
| 88 | return ASYNC_COMPLETE; |
| 89 | } |
| 90 | |
| 91 | do { |
David 'Digit' Turner | af81d74 | 2014-02-03 17:11:18 +0100 | [diff] [blame] | 92 | ret = HANDLE_EINTR( |
| 93 | socket_send(aw->io->fd, |
| 94 | aw->buffer + aw->pos, |
| 95 | aw->buffsize - aw->pos)); |
David 'Digit' Turner | 6d44880 | 2010-11-18 16:14:03 +0100 | [diff] [blame] | 96 | if (ret == 0) { |
| 97 | /* disconnection ! */ |
| 98 | errno = ECONNRESET; |
| 99 | return ASYNC_ERROR; |
| 100 | } |
| 101 | if (ret < 0) { |
David 'Digit' Turner | 6d44880 | 2010-11-18 16:14:03 +0100 | [diff] [blame] | 102 | if (errno == EWOULDBLOCK || errno == EAGAIN) { |
| 103 | return ASYNC_NEED_MORE; |
| 104 | } |
| 105 | return ASYNC_ERROR; |
| 106 | } |
| 107 | aw->pos += ret; |
| 108 | |
| 109 | } while (aw->pos < aw->buffsize); |
| 110 | |
David 'Digit' Turner | f9e333a | 2011-03-17 14:57:51 +0100 | [diff] [blame] | 111 | loopIo_dontWantWrite(aw->io); |
David 'Digit' Turner | 6d44880 | 2010-11-18 16:14:03 +0100 | [diff] [blame] | 112 | return ASYNC_COMPLETE; |
| 113 | } |
| 114 | |
| 115 | |
| 116 | void |
| 117 | asyncLineReader_init(AsyncLineReader* alr, |
| 118 | void* buffer, |
| 119 | size_t buffsize, |
| 120 | LoopIo* io) |
| 121 | { |
| 122 | alr->buffer = buffer; |
| 123 | alr->buffsize = buffsize; |
| 124 | alr->pos = 0; |
David 'Digit' Turner | f9e333a | 2011-03-17 14:57:51 +0100 | [diff] [blame] | 125 | alr->io = io; |
Vladimir Chtchetkine | db611d5 | 2011-11-01 17:35:07 -0700 | [diff] [blame] | 126 | alr->eol = '\n'; |
David 'Digit' Turner | 6d44880 | 2010-11-18 16:14:03 +0100 | [diff] [blame] | 127 | if (buffsize > 0) |
| 128 | loopIo_wantRead(io); |
| 129 | } |
| 130 | |
| 131 | AsyncStatus |
David 'Digit' Turner | f9e333a | 2011-03-17 14:57:51 +0100 | [diff] [blame] | 132 | asyncLineReader_read(AsyncLineReader* alr) |
David 'Digit' Turner | 6d44880 | 2010-11-18 16:14:03 +0100 | [diff] [blame] | 133 | { |
| 134 | int ret; |
| 135 | |
| 136 | if (alr->pos >= alr->buffsize) { |
| 137 | errno = ENOMEM; |
| 138 | return ASYNC_ERROR; |
| 139 | } |
| 140 | |
| 141 | do { |
| 142 | char ch; |
David 'Digit' Turner | af81d74 | 2014-02-03 17:11:18 +0100 | [diff] [blame] | 143 | ret = HANDLE_EINTR(socket_recv(alr->io->fd, &ch, 1)); |
David 'Digit' Turner | 6d44880 | 2010-11-18 16:14:03 +0100 | [diff] [blame] | 144 | if (ret == 0) { |
| 145 | /* disconnection ! */ |
| 146 | errno = ECONNRESET; |
| 147 | return ASYNC_ERROR; |
| 148 | } |
| 149 | if (ret < 0) { |
David 'Digit' Turner | 6d44880 | 2010-11-18 16:14:03 +0100 | [diff] [blame] | 150 | if (errno == EWOULDBLOCK || errno == EAGAIN) { |
David 'Digit' Turner | f9e333a | 2011-03-17 14:57:51 +0100 | [diff] [blame] | 151 | loopIo_wantRead(alr->io); |
David 'Digit' Turner | 6d44880 | 2010-11-18 16:14:03 +0100 | [diff] [blame] | 152 | return ASYNC_NEED_MORE; |
| 153 | } |
| 154 | return ASYNC_ERROR; |
| 155 | } |
| 156 | alr->buffer[alr->pos++] = (uint8_t)ch; |
Vladimir Chtchetkine | db611d5 | 2011-11-01 17:35:07 -0700 | [diff] [blame] | 157 | if (ch == alr->eol) { |
David 'Digit' Turner | f9e333a | 2011-03-17 14:57:51 +0100 | [diff] [blame] | 158 | loopIo_dontWantRead(alr->io); |
David 'Digit' Turner | 6d44880 | 2010-11-18 16:14:03 +0100 | [diff] [blame] | 159 | return ASYNC_COMPLETE; |
| 160 | } |
| 161 | } while (alr->pos < alr->buffsize); |
| 162 | |
| 163 | /* Not enough room in the input buffer!*/ |
David 'Digit' Turner | f9e333a | 2011-03-17 14:57:51 +0100 | [diff] [blame] | 164 | loopIo_dontWantRead(alr->io); |
David 'Digit' Turner | 6d44880 | 2010-11-18 16:14:03 +0100 | [diff] [blame] | 165 | errno = ENOMEM; |
| 166 | return ASYNC_ERROR; |
| 167 | } |
| 168 | |
| 169 | const char* |
| 170 | asyncLineReader_getLineRaw(AsyncLineReader* alr, int *pLength) |
| 171 | { |
| 172 | if (alr->pos == 0 || alr->pos > alr->buffsize) |
| 173 | return NULL; |
| 174 | |
| 175 | if (pLength != 0) |
| 176 | *pLength = alr->pos; |
| 177 | |
| 178 | return (const char*) alr->buffer; |
| 179 | } |
| 180 | |
| 181 | const char* |
| 182 | asyncLineReader_getLine(AsyncLineReader* alr) |
| 183 | { |
| 184 | /* Strip trailing \n if any */ |
| 185 | size_t pos = alr->pos; |
| 186 | char* buffer = (char*) alr->buffer; |
| 187 | |
| 188 | if (pos == 0 || pos > alr->buffsize) |
| 189 | return NULL; |
| 190 | |
| 191 | pos--; |
| 192 | |
| 193 | /* Check that we have a proper terminator, and replace it with 0 */ |
Vladimir Chtchetkine | db611d5 | 2011-11-01 17:35:07 -0700 | [diff] [blame] | 194 | if (alr->eol == '\n') { |
| 195 | if (buffer[pos] != '\n') |
| 196 | return NULL; |
David 'Digit' Turner | 6d44880 | 2010-11-18 16:14:03 +0100 | [diff] [blame] | 197 | |
David 'Digit' Turner | 6d44880 | 2010-11-18 16:14:03 +0100 | [diff] [blame] | 198 | buffer[pos] = '\0'; |
Vladimir Chtchetkine | db611d5 | 2011-11-01 17:35:07 -0700 | [diff] [blame] | 199 | |
| 200 | /* Also strip \r\n */ |
| 201 | if (pos > 0 && buffer[--pos] == '\r') { |
| 202 | buffer[pos] = '\0'; |
| 203 | } |
David 'Digit' Turner | 6d44880 | 2010-11-18 16:14:03 +0100 | [diff] [blame] | 204 | } |
| 205 | |
| 206 | return (const char*) buffer; |
| 207 | } |
| 208 | |
| 209 | |
| 210 | enum { |
| 211 | CONNECT_ERROR = 0, |
| 212 | CONNECT_CONNECTING, |
| 213 | CONNECT_COMPLETED |
| 214 | }; |
| 215 | |
| 216 | AsyncStatus |
| 217 | asyncConnector_init(AsyncConnector* ac, |
| 218 | const SockAddress* address, |
| 219 | LoopIo* io) |
| 220 | { |
| 221 | int ret; |
| 222 | ac->error = 0; |
David 'Digit' Turner | f9e333a | 2011-03-17 14:57:51 +0100 | [diff] [blame] | 223 | ac->io = io; |
David 'Digit' Turner | 6d44880 | 2010-11-18 16:14:03 +0100 | [diff] [blame] | 224 | ret = socket_connect(io->fd, address); |
| 225 | if (ret == 0) { |
| 226 | ac->state = CONNECT_COMPLETED; |
| 227 | return ASYNC_COMPLETE; |
| 228 | } |
| 229 | if (errno == EINPROGRESS || errno == EWOULDBLOCK || errno == EAGAIN) { |
| 230 | ac->state = CONNECT_CONNECTING; |
| 231 | /* The socket will be marked writable for select() when the |
| 232 | * connection is established, or when it is definitely |
| 233 | * refused / timed-out, for any reason. */ |
| 234 | loopIo_wantWrite(io); |
| 235 | return ASYNC_NEED_MORE; |
| 236 | } |
| 237 | ac->error = errno; |
| 238 | ac->state = CONNECT_ERROR; |
| 239 | return ASYNC_ERROR; |
| 240 | } |
| 241 | |
| 242 | AsyncStatus |
David 'Digit' Turner | f9e333a | 2011-03-17 14:57:51 +0100 | [diff] [blame] | 243 | asyncConnector_run(AsyncConnector* ac) |
David 'Digit' Turner | 6d44880 | 2010-11-18 16:14:03 +0100 | [diff] [blame] | 244 | { |
| 245 | switch (ac->state) { |
| 246 | case CONNECT_ERROR: |
| 247 | errno = ac->error; |
| 248 | return ASYNC_ERROR; |
| 249 | |
| 250 | case CONNECT_CONNECTING: |
David 'Digit' Turner | f9e333a | 2011-03-17 14:57:51 +0100 | [diff] [blame] | 251 | loopIo_dontWantWrite(ac->io); |
David 'Digit' Turner | 6d44880 | 2010-11-18 16:14:03 +0100 | [diff] [blame] | 252 | /* We need to read the socket error to determine if |
| 253 | * the connection was really succesful or not. This |
| 254 | * is optional, because in case of error a future |
Vladimir Chtchetkine | 17ecca6 | 2011-02-07 14:14:14 -0800 | [diff] [blame] | 255 | * socket_recv() or socket_send() will fail anyway, but this |
David 'Digit' Turner | 6d44880 | 2010-11-18 16:14:03 +0100 | [diff] [blame] | 256 | * allows us to get a better error value as soon as |
| 257 | * possible. |
| 258 | */ |
David 'Digit' Turner | f9e333a | 2011-03-17 14:57:51 +0100 | [diff] [blame] | 259 | ac->error = socket_get_error(ac->io->fd); |
David 'Digit' Turner | 6d44880 | 2010-11-18 16:14:03 +0100 | [diff] [blame] | 260 | if (ac->error == 0) { |
| 261 | ac->state = CONNECT_COMPLETED; |
| 262 | return ASYNC_COMPLETE; |
| 263 | } |
| 264 | ac->state = CONNECT_ERROR; |
| 265 | errno = ac->error; |
| 266 | return ASYNC_ERROR; |
| 267 | |
| 268 | default: |
| 269 | return ASYNC_COMPLETE; |
| 270 | } |
| 271 | } |
Vladimir Chtchetkine | ef4ccd3 | 2012-04-03 10:27:12 -0700 | [diff] [blame] | 272 | |
| 273 | int |
| 274 | asyncConnector_stop(AsyncConnector* ac) |
| 275 | { |
| 276 | if (ac->state == CONNECT_CONNECTING) { |
| 277 | loopIo_dontWantWrite(ac->io); |
| 278 | ac->state = CONNECT_COMPLETED; |
| 279 | return 0; |
| 280 | } |
| 281 | return -1; |
| 282 | } |