The Tor Browser / file comparison
comparison: other-licenses/android/ev_streams.c
other-licenses/android/ev_streams.c
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- TOR_BUG_9701
- changeset 8
- 97036ab72558
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| -1:000000000000 | 0:67243b8f9828 |
|---|---|
| 1 /* $NetBSD: ev_streams.c,v 1.2 2004/05/20 19:52:31 christos Exp $ */ | |
| 2 | |
| 3 /* | |
| 4 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") | |
| 5 * Copyright (c) 1996-1999 by Internet Software Consortium | |
| 6 * | |
| 7 * Permission to use, copy, modify, and distribute this software for any | |
| 8 * purpose with or without fee is hereby granted, provided that the above | |
| 9 * copyright notice and this permission notice appear in all copies. | |
| 10 * | |
| 11 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES | |
| 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
| 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR | |
| 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
| 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
| 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT | |
| 17 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
| 18 */ | |
| 19 | |
| 20 /* ev_streams.c - implement asynch stream file IO for the eventlib | |
| 21 * vix 04mar96 [initial] | |
| 22 */ | |
| 23 | |
| 24 /* | |
| 25 * This version of this file is derived from Android 2.3 "Gingerbread", | |
| 26 * which contains uncredited changes by Android/Google developers. It has | |
| 27 * been modified in 2011 for use in the Android build of Mozilla Firefox by | |
| 28 * Mozilla contributors (including Michael Edwards <m.k.edwards@gmail.com>, | |
| 29 * and Steve Workman <sjhworkman@gmail.com>). | |
| 30 * These changes are offered under the same license as the original NetBSD | |
| 31 * file, whose copyright and license are unchanged above. | |
| 32 */ | |
| 33 | |
| 34 #define ANDROID_CHANGES 1 | |
| 35 #define MOZILLA_NECKO_EXCLUDE_CODE 1 | |
| 36 | |
| 37 #include <sys/cdefs.h> | |
| 38 #if !defined(LINT) && !defined(CODECENTER) && !defined(lint) | |
| 39 #ifdef notdef | |
| 40 static const char rcsid[] = "Id: ev_streams.c,v 1.2.206.2 2004/03/17 00:29:51 marka Exp"; | |
| 41 #else | |
| 42 __RCSID("$NetBSD: ev_streams.c,v 1.2 2004/05/20 19:52:31 christos Exp $"); | |
| 43 #endif | |
| 44 #endif | |
| 45 | |
| 46 #include <sys/types.h> | |
| 47 #include <sys/uio.h> | |
| 48 | |
| 49 #include <errno.h> | |
| 50 | |
| 51 #include "eventlib.h" | |
| 52 #include "eventlib_p.h" | |
| 53 | |
| 54 #ifndef MOZILLA_NECKO_EXCLUDE_CODE | |
| 55 #ifndef _LIBC | |
| 56 static int copyvec(evStream *str, const struct iovec *iov, int iocnt); | |
| 57 static void consume(evStream *str, size_t bytes); | |
| 58 static void done(evContext opaqueCtx, evStream *str); | |
| 59 static void writable(evContext opaqueCtx, void *uap, int fd, int evmask); | |
| 60 static void readable(evContext opaqueCtx, void *uap, int fd, int evmask); | |
| 61 #endif | |
| 62 #endif | |
| 63 | |
| 64 struct iovec | |
| 65 evConsIovec(void *buf, size_t cnt) { | |
| 66 struct iovec ret; | |
| 67 | |
| 68 memset(&ret, 0xf5, sizeof ret); | |
| 69 ret.iov_base = buf; | |
| 70 ret.iov_len = cnt; | |
| 71 return (ret); | |
| 72 } | |
| 73 | |
| 74 #ifndef MOZILLA_NECKO_EXCLUDE_CODE | |
| 75 #ifndef _LIBC | |
| 76 int | |
| 77 evWrite(evContext opaqueCtx, int fd, const struct iovec *iov, int iocnt, | |
| 78 evStreamFunc func, void *uap, evStreamID *id) | |
| 79 { | |
| 80 evContext_p *ctx = opaqueCtx.opaque; | |
| 81 evStream *new; | |
| 82 int save; | |
| 83 | |
| 84 OKNEW(new); | |
| 85 new->func = func; | |
| 86 new->uap = uap; | |
| 87 new->fd = fd; | |
| 88 new->flags = 0; | |
| 89 if (evSelectFD(opaqueCtx, fd, EV_WRITE, writable, new, &new->file) < 0) | |
| 90 goto free; | |
| 91 if (copyvec(new, iov, iocnt) < 0) | |
| 92 goto free; | |
| 93 new->prevDone = NULL; | |
| 94 new->nextDone = NULL; | |
| 95 if (ctx->streams != NULL) | |
| 96 ctx->streams->prev = new; | |
| 97 new->prev = NULL; | |
| 98 new->next = ctx->streams; | |
| 99 ctx->streams = new; | |
| 100 if (id != NULL) | |
| 101 id->opaque = new; | |
| 102 return (0); | |
| 103 free: | |
| 104 save = errno; | |
| 105 FREE(new); | |
| 106 errno = save; | |
| 107 return (-1); | |
| 108 } | |
| 109 | |
| 110 int | |
| 111 evRead(evContext opaqueCtx, int fd, const struct iovec *iov, int iocnt, | |
| 112 evStreamFunc func, void *uap, evStreamID *id) | |
| 113 { | |
| 114 evContext_p *ctx = opaqueCtx.opaque; | |
| 115 evStream *new; | |
| 116 int save; | |
| 117 | |
| 118 OKNEW(new); | |
| 119 new->func = func; | |
| 120 new->uap = uap; | |
| 121 new->fd = fd; | |
| 122 new->flags = 0; | |
| 123 if (evSelectFD(opaqueCtx, fd, EV_READ, readable, new, &new->file) < 0) | |
| 124 goto free; | |
| 125 if (copyvec(new, iov, iocnt) < 0) | |
| 126 goto free; | |
| 127 new->prevDone = NULL; | |
| 128 new->nextDone = NULL; | |
| 129 if (ctx->streams != NULL) | |
| 130 ctx->streams->prev = new; | |
| 131 new->prev = NULL; | |
| 132 new->next = ctx->streams; | |
| 133 ctx->streams = new; | |
| 134 if (id) | |
| 135 id->opaque = new; | |
| 136 return (0); | |
| 137 free: | |
| 138 save = errno; | |
| 139 FREE(new); | |
| 140 errno = save; | |
| 141 return (-1); | |
| 142 } | |
| 143 | |
| 144 int | |
| 145 evTimeRW(evContext opaqueCtx, evStreamID id, evTimerID timer) /*ARGSUSED*/ { | |
| 146 evStream *str = id.opaque; | |
| 147 | |
| 148 UNUSED(opaqueCtx); | |
| 149 | |
| 150 str->timer = timer; | |
| 151 str->flags |= EV_STR_TIMEROK; | |
| 152 return (0); | |
| 153 } | |
| 154 | |
| 155 int | |
| 156 evUntimeRW(evContext opaqueCtx, evStreamID id) /*ARGSUSED*/ { | |
| 157 evStream *str = id.opaque; | |
| 158 | |
| 159 UNUSED(opaqueCtx); | |
| 160 | |
| 161 str->flags &= ~EV_STR_TIMEROK; | |
| 162 return (0); | |
| 163 } | |
| 164 | |
| 165 int | |
| 166 evCancelRW(evContext opaqueCtx, evStreamID id) { | |
| 167 evContext_p *ctx = opaqueCtx.opaque; | |
| 168 evStream *old = id.opaque; | |
| 169 | |
| 170 /* | |
| 171 * The streams list is doubly threaded. First, there's ctx->streams | |
| 172 * that's used by evDestroy() to find and cancel all streams. Second, | |
| 173 * there's ctx->strDone (head) and ctx->strLast (tail) which thread | |
| 174 * through the potentially smaller number of "IO completed" streams, | |
| 175 * used in evGetNext() to avoid scanning the entire list. | |
| 176 */ | |
| 177 | |
| 178 /* Unlink from ctx->streams. */ | |
| 179 if (old->prev != NULL) | |
| 180 old->prev->next = old->next; | |
| 181 else | |
| 182 ctx->streams = old->next; | |
| 183 if (old->next != NULL) | |
| 184 old->next->prev = old->prev; | |
| 185 | |
| 186 /* | |
| 187 * If 'old' is on the ctx->strDone list, remove it. Update | |
| 188 * ctx->strLast if necessary. | |
| 189 */ | |
| 190 if (old->prevDone == NULL && old->nextDone == NULL) { | |
| 191 /* | |
| 192 * Either 'old' is the only item on the done list, or it's | |
| 193 * not on the done list. If the former, then we unlink it | |
| 194 * from the list. If the latter, we leave the list alone. | |
| 195 */ | |
| 196 if (ctx->strDone == old) { | |
| 197 ctx->strDone = NULL; | |
| 198 ctx->strLast = NULL; | |
| 199 } | |
| 200 } else { | |
| 201 if (old->prevDone != NULL) | |
| 202 old->prevDone->nextDone = old->nextDone; | |
| 203 else | |
| 204 ctx->strDone = old->nextDone; | |
| 205 if (old->nextDone != NULL) | |
| 206 old->nextDone->prevDone = old->prevDone; | |
| 207 else | |
| 208 ctx->strLast = old->prevDone; | |
| 209 } | |
| 210 | |
| 211 /* Deallocate the stream. */ | |
| 212 if (old->file.opaque) | |
| 213 evDeselectFD(opaqueCtx, old->file); | |
| 214 memput(old->iovOrig, sizeof (struct iovec) * old->iovOrigCount); | |
| 215 FREE(old); | |
| 216 return (0); | |
| 217 } | |
| 218 | |
| 219 /* Copy a scatter/gather vector and initialize a stream handler's IO. */ | |
| 220 static int | |
| 221 copyvec(evStream *str, const struct iovec *iov, int iocnt) { | |
| 222 int i; | |
| 223 | |
| 224 str->iovOrig = (struct iovec *)memget(sizeof(struct iovec) * iocnt); | |
| 225 if (str->iovOrig == NULL) { | |
| 226 errno = ENOMEM; | |
| 227 return (-1); | |
| 228 } | |
| 229 str->ioTotal = 0; | |
| 230 for (i = 0; i < iocnt; i++) { | |
| 231 str->iovOrig[i] = iov[i]; | |
| 232 str->ioTotal += iov[i].iov_len; | |
| 233 } | |
| 234 str->iovOrigCount = iocnt; | |
| 235 str->iovCur = str->iovOrig; | |
| 236 str->iovCurCount = str->iovOrigCount; | |
| 237 str->ioDone = 0; | |
| 238 return (0); | |
| 239 } | |
| 240 | |
| 241 /* Pull off or truncate lead iovec(s). */ | |
| 242 static void | |
| 243 consume(evStream *str, size_t bytes) { | |
| 244 while (bytes > 0U) { | |
| 245 if (bytes < (size_t)str->iovCur->iov_len) { | |
| 246 str->iovCur->iov_len -= bytes; | |
| 247 str->iovCur->iov_base = (void *) | |
| 248 ((u_char *)str->iovCur->iov_base + bytes); | |
| 249 str->ioDone += bytes; | |
| 250 bytes = 0; | |
| 251 } else { | |
| 252 bytes -= str->iovCur->iov_len; | |
| 253 str->ioDone += str->iovCur->iov_len; | |
| 254 str->iovCur++; | |
| 255 str->iovCurCount--; | |
| 256 } | |
| 257 } | |
| 258 } | |
| 259 | |
| 260 /* Add a stream to Done list and deselect the FD. */ | |
| 261 static void | |
| 262 done(evContext opaqueCtx, evStream *str) { | |
| 263 evContext_p *ctx = opaqueCtx.opaque; | |
| 264 | |
| 265 if (ctx->strLast != NULL) { | |
| 266 str->prevDone = ctx->strLast; | |
| 267 ctx->strLast->nextDone = str; | |
| 268 ctx->strLast = str; | |
| 269 } else { | |
| 270 INSIST(ctx->strDone == NULL); | |
| 271 ctx->strDone = ctx->strLast = str; | |
| 272 } | |
| 273 evDeselectFD(opaqueCtx, str->file); | |
| 274 str->file.opaque = NULL; | |
| 275 /* evDrop() will call evCancelRW() on us. */ | |
| 276 } | |
| 277 | |
| 278 /* Dribble out some bytes on the stream. (Called by evDispatch().) */ | |
| 279 static void | |
| 280 writable(evContext opaqueCtx, void *uap, int fd, int evmask) { | |
| 281 evStream *str = uap; | |
| 282 int bytes; | |
| 283 | |
| 284 UNUSED(evmask); | |
| 285 | |
| 286 bytes = writev(fd, str->iovCur, str->iovCurCount); | |
| 287 if (bytes > 0) { | |
| 288 if ((str->flags & EV_STR_TIMEROK) != 0) | |
| 289 evTouchIdleTimer(opaqueCtx, str->timer); | |
| 290 consume(str, bytes); | |
| 291 } else { | |
| 292 if (bytes < 0 && errno != EINTR) { | |
| 293 str->ioDone = -1; | |
| 294 str->ioErrno = errno; | |
| 295 } | |
| 296 } | |
| 297 if (str->ioDone == -1 || str->ioDone == str->ioTotal) | |
| 298 done(opaqueCtx, str); | |
| 299 } | |
| 300 | |
| 301 /* Scoop up some bytes from the stream. (Called by evDispatch().) */ | |
| 302 static void | |
| 303 readable(evContext opaqueCtx, void *uap, int fd, int evmask) { | |
| 304 evStream *str = uap; | |
| 305 int bytes; | |
| 306 | |
| 307 UNUSED(evmask); | |
| 308 | |
| 309 bytes = readv(fd, str->iovCur, str->iovCurCount); | |
| 310 if (bytes > 0) { | |
| 311 if ((str->flags & EV_STR_TIMEROK) != 0) | |
| 312 evTouchIdleTimer(opaqueCtx, str->timer); | |
| 313 consume(str, bytes); | |
| 314 } else { | |
| 315 if (bytes == 0) | |
| 316 str->ioDone = 0; | |
| 317 else { | |
| 318 if (errno != EINTR) { | |
| 319 str->ioDone = -1; | |
| 320 str->ioErrno = errno; | |
| 321 } | |
| 322 } | |
| 323 } | |
| 324 if (str->ioDone <= 0 || str->ioDone == str->ioTotal) | |
| 325 done(opaqueCtx, str); | |
| 326 } | |
| 327 #endif | |
| 328 #endif |
