Vladimir Chtchetkine | a8fc491 | 2010-11-30 09:32:55 -0800 | [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 | |
| 17 | /* |
| 18 | * Contains helper routines dealing with syncronous access to a non-blocking |
| 19 | * sokets. |
| 20 | */ |
| 21 | |
| 22 | #include "qemu-common.h" |
| 23 | #include "errno.h" |
David 'Digit' Turner | d413fa5 | 2013-12-14 23:35:20 +0100 | [diff] [blame] | 24 | #include "android/iolooper.h" |
David 'Digit' Turner | cc330d4 | 2013-12-14 23:26:42 +0100 | [diff] [blame] | 25 | #include "android/sockets.h" |
Vladimir Chtchetkine | a8fc491 | 2010-11-30 09:32:55 -0800 | [diff] [blame] | 26 | #include "android/utils/debug.h" |
| 27 | #include "android/sync-utils.h" |
Vladimir Chtchetkine | 9411a56 | 2011-01-19 18:29:27 -0800 | [diff] [blame] | 28 | #include "android/utils/system.h" |
Vladimir Chtchetkine | a8fc491 | 2010-11-30 09:32:55 -0800 | [diff] [blame] | 29 | |
| 30 | #define D(...) do { if (VERBOSE_CHECK(init)) dprint(__VA_ARGS__); } while (0) |
| 31 | |
| 32 | struct SyncSocket { |
| 33 | // Helper for performing synchronous I/O on the socket. |
| 34 | IoLooper* iolooper; |
| 35 | |
| 36 | /* Opened socket handle. */ |
| 37 | int fd; |
| 38 | }; |
| 39 | |
| 40 | SyncSocket* |
Vladimir Chtchetkine | 9411a56 | 2011-01-19 18:29:27 -0800 | [diff] [blame] | 41 | syncsocket_init(int fd) |
| 42 | { |
| 43 | SyncSocket* sync_socket; |
| 44 | ANEW0(sync_socket); |
| 45 | |
| 46 | socket_set_nonblock(fd); |
| 47 | sync_socket->iolooper = iolooper_new(); |
| 48 | sync_socket->fd = fd; |
| 49 | |
| 50 | return sync_socket; |
| 51 | } |
| 52 | |
| 53 | SyncSocket* |
Vladimir Chtchetkine | a8fc491 | 2010-11-30 09:32:55 -0800 | [diff] [blame] | 54 | syncsocket_connect(int fd, SockAddress* sockaddr, int timeout) |
| 55 | { |
Vladimir Chtchetkine | 9411a56 | 2011-01-19 18:29:27 -0800 | [diff] [blame] | 56 | IoLooper* looper; |
Vladimir Chtchetkine | a8fc491 | 2010-11-30 09:32:55 -0800 | [diff] [blame] | 57 | int connect_status; |
Vladimir Chtchetkine | 9411a56 | 2011-01-19 18:29:27 -0800 | [diff] [blame] | 58 | SyncSocket* sync_socket = NULL; |
Vladimir Chtchetkine | a8fc491 | 2010-11-30 09:32:55 -0800 | [diff] [blame] | 59 | |
| 60 | socket_set_nonblock(fd); |
| 61 | |
| 62 | for(;;) { |
| 63 | connect_status = socket_connect(fd, sockaddr); |
| 64 | if (connect_status >= 0) { |
| 65 | // Connected. Create IoLooper for the helper. |
| 66 | looper = iolooper_new(); |
| 67 | break; |
| 68 | } |
| 69 | |
| 70 | if (errno == EINPROGRESS || errno == EAGAIN || errno == EWOULDBLOCK) { |
| 71 | // Connection is in progress. Wait till it's finished. |
| 72 | looper = iolooper_new(); |
| 73 | iolooper_add_write(looper, fd); |
| 74 | connect_status = iolooper_wait(looper, timeout); |
| 75 | if (connect_status > 0) { |
| 76 | iolooper_del_write(looper, fd); |
Vladimir Chtchetkine | 17ecca6 | 2011-02-07 14:14:14 -0800 | [diff] [blame] | 77 | break; |
Vladimir Chtchetkine | a8fc491 | 2010-11-30 09:32:55 -0800 | [diff] [blame] | 78 | } else { |
| 79 | iolooper_free(looper); |
| 80 | return NULL; |
| 81 | } |
David 'Digit' Turner | af81d74 | 2014-02-03 17:11:18 +0100 | [diff] [blame] | 82 | } else { |
Vladimir Chtchetkine | a8fc491 | 2010-11-30 09:32:55 -0800 | [diff] [blame] | 83 | return NULL; |
| 84 | } |
| 85 | } |
| 86 | |
| 87 | // We're now connected. Lets initialize SyncSocket instance |
| 88 | // for this connection. |
| 89 | sync_socket = malloc(sizeof(SyncSocket)); |
| 90 | if (sync_socket == NULL) { |
| 91 | derror("PANIC: not enough memory\n"); |
| 92 | exit(1); |
| 93 | } |
| 94 | |
| 95 | sync_socket->iolooper = looper; |
| 96 | sync_socket->fd = fd; |
| 97 | |
| 98 | return sync_socket; |
| 99 | } |
| 100 | |
| 101 | void |
| 102 | syncsocket_close(SyncSocket* ssocket) |
| 103 | { |
| 104 | if (ssocket != NULL && ssocket->fd >= 0) { |
| 105 | if (ssocket->iolooper != NULL) { |
| 106 | iolooper_reset(ssocket->iolooper); |
| 107 | } |
| 108 | socket_close(ssocket->fd); |
| 109 | ssocket->fd = -1; |
| 110 | } |
| 111 | } |
| 112 | |
| 113 | void |
| 114 | syncsocket_free(SyncSocket* ssocket) |
| 115 | { |
| 116 | if (ssocket != NULL) { |
Vladimir Chtchetkine | a8fc491 | 2010-11-30 09:32:55 -0800 | [diff] [blame] | 117 | if (ssocket->iolooper != NULL) { |
| 118 | iolooper_free(ssocket->iolooper); |
| 119 | } |
| 120 | free(ssocket); |
| 121 | } |
| 122 | } |
| 123 | |
| 124 | int |
| 125 | syncsocket_start_read(SyncSocket* ssocket) |
| 126 | { |
| 127 | if (ssocket == NULL || ssocket->fd < 0 || ssocket->iolooper == NULL) { |
| 128 | errno = EINVAL; |
| 129 | return -1; |
| 130 | } |
| 131 | iolooper_add_read(ssocket->iolooper, ssocket->fd); |
| 132 | return 0; |
| 133 | } |
| 134 | |
| 135 | int |
| 136 | syncsocket_stop_read(SyncSocket* ssocket) |
| 137 | { |
| 138 | if (ssocket == NULL || ssocket->fd < 0 || ssocket->iolooper == NULL) { |
| 139 | errno = EINVAL; |
| 140 | return -1; |
| 141 | } |
| 142 | iolooper_del_read(ssocket->iolooper, ssocket->fd); |
| 143 | return 0; |
| 144 | } |
| 145 | |
| 146 | int |
Vladimir Chtchetkine | d87b080 | 2010-12-06 10:55:11 -0800 | [diff] [blame] | 147 | syncsocket_start_write(SyncSocket* ssocket) |
| 148 | { |
| 149 | if (ssocket == NULL || ssocket->fd < 0 || ssocket->iolooper == NULL) { |
| 150 | errno = EINVAL; |
| 151 | return -1; |
| 152 | } |
| 153 | iolooper_add_write(ssocket->iolooper, ssocket->fd); |
| 154 | return 0; |
| 155 | } |
| 156 | |
| 157 | int |
| 158 | syncsocket_stop_write(SyncSocket* ssocket) |
| 159 | { |
| 160 | if (ssocket == NULL || ssocket->fd < 0 || ssocket->iolooper == NULL) { |
| 161 | errno = EINVAL; |
| 162 | return -1; |
| 163 | } |
| 164 | iolooper_del_write(ssocket->iolooper, ssocket->fd); |
| 165 | return 0; |
| 166 | } |
| 167 | |
| 168 | ssize_t |
Vladimir Chtchetkine | a8fc491 | 2010-11-30 09:32:55 -0800 | [diff] [blame] | 169 | syncsocket_read_absolute(SyncSocket* ssocket, |
| 170 | void* buf, |
Vladimir Chtchetkine | 0d4c882 | 2010-12-01 17:29:09 -0800 | [diff] [blame] | 171 | size_t size, |
Vladimir Chtchetkine | a8fc491 | 2010-11-30 09:32:55 -0800 | [diff] [blame] | 172 | int64_t deadline) |
| 173 | { |
| 174 | int ret; |
| 175 | |
| 176 | if (ssocket == NULL || ssocket->fd < 0 || ssocket->iolooper == NULL) { |
| 177 | errno = EINVAL; |
| 178 | return -1; |
| 179 | } |
| 180 | |
| 181 | ret = iolooper_wait_absolute(ssocket->iolooper, deadline); |
| 182 | if (ret > 0) { |
| 183 | if (!iolooper_is_read(ssocket->iolooper, ssocket->fd)) { |
| 184 | D("%s: Internal error, iolooper_is_read() not set!", __FUNCTION__); |
| 185 | return -1; |
| 186 | } |
David 'Digit' Turner | af81d74 | 2014-02-03 17:11:18 +0100 | [diff] [blame] | 187 | ret = socket_recv(ssocket->fd, buf, size); |
Vladimir Chtchetkine | d87b080 | 2010-12-06 10:55:11 -0800 | [diff] [blame] | 188 | } else if (ret == 0) { |
| 189 | // Timed out |
| 190 | errno = ETIMEDOUT; |
| 191 | ret = -1; |
Vladimir Chtchetkine | a8fc491 | 2010-11-30 09:32:55 -0800 | [diff] [blame] | 192 | } |
| 193 | return ret; |
| 194 | } |
| 195 | |
Vladimir Chtchetkine | d87b080 | 2010-12-06 10:55:11 -0800 | [diff] [blame] | 196 | ssize_t |
Vladimir Chtchetkine | 0d4c882 | 2010-12-01 17:29:09 -0800 | [diff] [blame] | 197 | syncsocket_read(SyncSocket* ssocket, void* buf, size_t size, int timeout) |
Vladimir Chtchetkine | a8fc491 | 2010-11-30 09:32:55 -0800 | [diff] [blame] | 198 | { |
| 199 | return syncsocket_read_absolute(ssocket, buf, size, iolooper_now() + timeout); |
| 200 | } |
Vladimir Chtchetkine | 0d4c882 | 2010-12-01 17:29:09 -0800 | [diff] [blame] | 201 | |
Vladimir Chtchetkine | d87b080 | 2010-12-06 10:55:11 -0800 | [diff] [blame] | 202 | ssize_t |
| 203 | syncsocket_write_absolute(SyncSocket* ssocket, |
| 204 | const void* buf, |
| 205 | size_t size, |
| 206 | int64_t deadline) |
| 207 | { |
| 208 | int ret; |
| 209 | size_t written = 0; |
| 210 | |
| 211 | if (ssocket == NULL || ssocket->fd < 0 || ssocket->iolooper == NULL) { |
| 212 | errno = EINVAL; |
| 213 | return -1; |
| 214 | } |
| 215 | |
| 216 | do { |
| 217 | ret = iolooper_wait_absolute(ssocket->iolooper, deadline); |
| 218 | if (ret < 0) { |
| 219 | return ret; |
| 220 | } else if (ret == 0) { |
| 221 | // Timeout. |
| 222 | errno = ETIMEDOUT; |
| 223 | return -1; |
| 224 | } |
| 225 | if (!iolooper_is_write(ssocket->iolooper, ssocket->fd)) { |
| 226 | D("%s: Internal error, iolooper_is_write() not set!", __FUNCTION__); |
| 227 | return -1; |
| 228 | } |
| 229 | |
David 'Digit' Turner | af81d74 | 2014-02-03 17:11:18 +0100 | [diff] [blame] | 230 | ret = socket_send(ssocket->fd, (const char*)buf + written, size - written); |
Vladimir Chtchetkine | d87b080 | 2010-12-06 10:55:11 -0800 | [diff] [blame] | 231 | if (ret > 0) { |
| 232 | written += ret; |
| 233 | } else if (ret < 0) { |
| 234 | if (errno != EAGAIN && errno != EWOULDBLOCK) { |
| 235 | return -1; |
| 236 | } |
| 237 | } else { |
| 238 | // Disconnected. |
| 239 | errno = ECONNRESET; |
| 240 | return -1; |
| 241 | } |
| 242 | } while (written < size); |
| 243 | return (int)written; |
| 244 | } |
| 245 | |
| 246 | ssize_t |
| 247 | syncsocket_write(SyncSocket* ssocket, const void* buf, size_t size, int timeout) |
| 248 | { |
| 249 | return syncsocket_write_absolute(ssocket, buf, size, iolooper_now() + timeout); |
| 250 | } |
| 251 | |
| 252 | ssize_t |
Vladimir Chtchetkine | 0d4c882 | 2010-12-01 17:29:09 -0800 | [diff] [blame] | 253 | syncsocket_read_line_absolute(SyncSocket* ssocket, |
| 254 | char* buffer, |
| 255 | size_t size, |
| 256 | int64_t deadline) |
| 257 | { |
| 258 | size_t read_chars = 0; |
| 259 | |
| 260 | while (read_chars < size) { |
| 261 | char ch; |
| 262 | int ret = syncsocket_read_absolute(ssocket, &ch, 1, deadline); |
| 263 | if (ret <= 0) { |
| 264 | return ret; |
| 265 | } |
| 266 | buffer[read_chars++] = ch; |
| 267 | if (ch == '\n') { |
Vladimir Chtchetkine | d87b080 | 2010-12-06 10:55:11 -0800 | [diff] [blame] | 268 | return read_chars; |
Vladimir Chtchetkine | 0d4c882 | 2010-12-01 17:29:09 -0800 | [diff] [blame] | 269 | } |
| 270 | } |
| 271 | |
| 272 | /* Not enough room in the input buffer!*/ |
| 273 | errno = ENOMEM; |
| 274 | return -1; |
| 275 | } |
| 276 | |
Vladimir Chtchetkine | d87b080 | 2010-12-06 10:55:11 -0800 | [diff] [blame] | 277 | ssize_t |
Vladimir Chtchetkine | 0d4c882 | 2010-12-01 17:29:09 -0800 | [diff] [blame] | 278 | syncsocket_read_line(SyncSocket* ssocket, char* buffer, size_t size, int timeout) |
| 279 | { |
| 280 | return syncsocket_read_line_absolute(ssocket, buffer, size, |
| 281 | iolooper_now() + timeout); |
| 282 | } |
Vladimir Chtchetkine | e95660a | 2010-12-20 08:28:03 -0800 | [diff] [blame] | 283 | |
| 284 | int |
| 285 | syncsocket_get_socket(SyncSocket* ssocket) |
| 286 | { |
| 287 | return (ssocket != NULL) ? ssocket->fd : -1; |
| 288 | } |