1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/other-licenses/android/ev_streams.c Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,328 @@
1.4 +/* $NetBSD: ev_streams.c,v 1.2 2004/05/20 19:52:31 christos Exp $ */
1.5 +
1.6 +/*
1.7 + * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
1.8 + * Copyright (c) 1996-1999 by Internet Software Consortium
1.9 + *
1.10 + * Permission to use, copy, modify, and distribute this software for any
1.11 + * purpose with or without fee is hereby granted, provided that the above
1.12 + * copyright notice and this permission notice appear in all copies.
1.13 + *
1.14 + * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
1.15 + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
1.16 + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
1.17 + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
1.18 + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
1.19 + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
1.20 + * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
1.21 + */
1.22 +
1.23 +/* ev_streams.c - implement asynch stream file IO for the eventlib
1.24 + * vix 04mar96 [initial]
1.25 + */
1.26 +
1.27 +/*
1.28 + * This version of this file is derived from Android 2.3 "Gingerbread",
1.29 + * which contains uncredited changes by Android/Google developers. It has
1.30 + * been modified in 2011 for use in the Android build of Mozilla Firefox by
1.31 + * Mozilla contributors (including Michael Edwards <m.k.edwards@gmail.com>,
1.32 + * and Steve Workman <sjhworkman@gmail.com>).
1.33 + * These changes are offered under the same license as the original NetBSD
1.34 + * file, whose copyright and license are unchanged above.
1.35 + */
1.36 +
1.37 +#define ANDROID_CHANGES 1
1.38 +#define MOZILLA_NECKO_EXCLUDE_CODE 1
1.39 +
1.40 +#include <sys/cdefs.h>
1.41 +#if !defined(LINT) && !defined(CODECENTER) && !defined(lint)
1.42 +#ifdef notdef
1.43 +static const char rcsid[] = "Id: ev_streams.c,v 1.2.206.2 2004/03/17 00:29:51 marka Exp";
1.44 +#else
1.45 +__RCSID("$NetBSD: ev_streams.c,v 1.2 2004/05/20 19:52:31 christos Exp $");
1.46 +#endif
1.47 +#endif
1.48 +
1.49 +#include <sys/types.h>
1.50 +#include <sys/uio.h>
1.51 +
1.52 +#include <errno.h>
1.53 +
1.54 +#include "eventlib.h"
1.55 +#include "eventlib_p.h"
1.56 +
1.57 +#ifndef MOZILLA_NECKO_EXCLUDE_CODE
1.58 +#ifndef _LIBC
1.59 +static int copyvec(evStream *str, const struct iovec *iov, int iocnt);
1.60 +static void consume(evStream *str, size_t bytes);
1.61 +static void done(evContext opaqueCtx, evStream *str);
1.62 +static void writable(evContext opaqueCtx, void *uap, int fd, int evmask);
1.63 +static void readable(evContext opaqueCtx, void *uap, int fd, int evmask);
1.64 +#endif
1.65 +#endif
1.66 +
1.67 +struct iovec
1.68 +evConsIovec(void *buf, size_t cnt) {
1.69 + struct iovec ret;
1.70 +
1.71 + memset(&ret, 0xf5, sizeof ret);
1.72 + ret.iov_base = buf;
1.73 + ret.iov_len = cnt;
1.74 + return (ret);
1.75 +}
1.76 +
1.77 +#ifndef MOZILLA_NECKO_EXCLUDE_CODE
1.78 +#ifndef _LIBC
1.79 +int
1.80 +evWrite(evContext opaqueCtx, int fd, const struct iovec *iov, int iocnt,
1.81 + evStreamFunc func, void *uap, evStreamID *id)
1.82 +{
1.83 + evContext_p *ctx = opaqueCtx.opaque;
1.84 + evStream *new;
1.85 + int save;
1.86 +
1.87 + OKNEW(new);
1.88 + new->func = func;
1.89 + new->uap = uap;
1.90 + new->fd = fd;
1.91 + new->flags = 0;
1.92 + if (evSelectFD(opaqueCtx, fd, EV_WRITE, writable, new, &new->file) < 0)
1.93 + goto free;
1.94 + if (copyvec(new, iov, iocnt) < 0)
1.95 + goto free;
1.96 + new->prevDone = NULL;
1.97 + new->nextDone = NULL;
1.98 + if (ctx->streams != NULL)
1.99 + ctx->streams->prev = new;
1.100 + new->prev = NULL;
1.101 + new->next = ctx->streams;
1.102 + ctx->streams = new;
1.103 + if (id != NULL)
1.104 + id->opaque = new;
1.105 + return (0);
1.106 + free:
1.107 + save = errno;
1.108 + FREE(new);
1.109 + errno = save;
1.110 + return (-1);
1.111 +}
1.112 +
1.113 +int
1.114 +evRead(evContext opaqueCtx, int fd, const struct iovec *iov, int iocnt,
1.115 + evStreamFunc func, void *uap, evStreamID *id)
1.116 +{
1.117 + evContext_p *ctx = opaqueCtx.opaque;
1.118 + evStream *new;
1.119 + int save;
1.120 +
1.121 + OKNEW(new);
1.122 + new->func = func;
1.123 + new->uap = uap;
1.124 + new->fd = fd;
1.125 + new->flags = 0;
1.126 + if (evSelectFD(opaqueCtx, fd, EV_READ, readable, new, &new->file) < 0)
1.127 + goto free;
1.128 + if (copyvec(new, iov, iocnt) < 0)
1.129 + goto free;
1.130 + new->prevDone = NULL;
1.131 + new->nextDone = NULL;
1.132 + if (ctx->streams != NULL)
1.133 + ctx->streams->prev = new;
1.134 + new->prev = NULL;
1.135 + new->next = ctx->streams;
1.136 + ctx->streams = new;
1.137 + if (id)
1.138 + id->opaque = new;
1.139 + return (0);
1.140 + free:
1.141 + save = errno;
1.142 + FREE(new);
1.143 + errno = save;
1.144 + return (-1);
1.145 +}
1.146 +
1.147 +int
1.148 +evTimeRW(evContext opaqueCtx, evStreamID id, evTimerID timer) /*ARGSUSED*/ {
1.149 + evStream *str = id.opaque;
1.150 +
1.151 + UNUSED(opaqueCtx);
1.152 +
1.153 + str->timer = timer;
1.154 + str->flags |= EV_STR_TIMEROK;
1.155 + return (0);
1.156 +}
1.157 +
1.158 +int
1.159 +evUntimeRW(evContext opaqueCtx, evStreamID id) /*ARGSUSED*/ {
1.160 + evStream *str = id.opaque;
1.161 +
1.162 + UNUSED(opaqueCtx);
1.163 +
1.164 + str->flags &= ~EV_STR_TIMEROK;
1.165 + return (0);
1.166 +}
1.167 +
1.168 +int
1.169 +evCancelRW(evContext opaqueCtx, evStreamID id) {
1.170 + evContext_p *ctx = opaqueCtx.opaque;
1.171 + evStream *old = id.opaque;
1.172 +
1.173 + /*
1.174 + * The streams list is doubly threaded. First, there's ctx->streams
1.175 + * that's used by evDestroy() to find and cancel all streams. Second,
1.176 + * there's ctx->strDone (head) and ctx->strLast (tail) which thread
1.177 + * through the potentially smaller number of "IO completed" streams,
1.178 + * used in evGetNext() to avoid scanning the entire list.
1.179 + */
1.180 +
1.181 + /* Unlink from ctx->streams. */
1.182 + if (old->prev != NULL)
1.183 + old->prev->next = old->next;
1.184 + else
1.185 + ctx->streams = old->next;
1.186 + if (old->next != NULL)
1.187 + old->next->prev = old->prev;
1.188 +
1.189 + /*
1.190 + * If 'old' is on the ctx->strDone list, remove it. Update
1.191 + * ctx->strLast if necessary.
1.192 + */
1.193 + if (old->prevDone == NULL && old->nextDone == NULL) {
1.194 + /*
1.195 + * Either 'old' is the only item on the done list, or it's
1.196 + * not on the done list. If the former, then we unlink it
1.197 + * from the list. If the latter, we leave the list alone.
1.198 + */
1.199 + if (ctx->strDone == old) {
1.200 + ctx->strDone = NULL;
1.201 + ctx->strLast = NULL;
1.202 + }
1.203 + } else {
1.204 + if (old->prevDone != NULL)
1.205 + old->prevDone->nextDone = old->nextDone;
1.206 + else
1.207 + ctx->strDone = old->nextDone;
1.208 + if (old->nextDone != NULL)
1.209 + old->nextDone->prevDone = old->prevDone;
1.210 + else
1.211 + ctx->strLast = old->prevDone;
1.212 + }
1.213 +
1.214 + /* Deallocate the stream. */
1.215 + if (old->file.opaque)
1.216 + evDeselectFD(opaqueCtx, old->file);
1.217 + memput(old->iovOrig, sizeof (struct iovec) * old->iovOrigCount);
1.218 + FREE(old);
1.219 + return (0);
1.220 +}
1.221 +
1.222 +/* Copy a scatter/gather vector and initialize a stream handler's IO. */
1.223 +static int
1.224 +copyvec(evStream *str, const struct iovec *iov, int iocnt) {
1.225 + int i;
1.226 +
1.227 + str->iovOrig = (struct iovec *)memget(sizeof(struct iovec) * iocnt);
1.228 + if (str->iovOrig == NULL) {
1.229 + errno = ENOMEM;
1.230 + return (-1);
1.231 + }
1.232 + str->ioTotal = 0;
1.233 + for (i = 0; i < iocnt; i++) {
1.234 + str->iovOrig[i] = iov[i];
1.235 + str->ioTotal += iov[i].iov_len;
1.236 + }
1.237 + str->iovOrigCount = iocnt;
1.238 + str->iovCur = str->iovOrig;
1.239 + str->iovCurCount = str->iovOrigCount;
1.240 + str->ioDone = 0;
1.241 + return (0);
1.242 +}
1.243 +
1.244 +/* Pull off or truncate lead iovec(s). */
1.245 +static void
1.246 +consume(evStream *str, size_t bytes) {
1.247 + while (bytes > 0U) {
1.248 + if (bytes < (size_t)str->iovCur->iov_len) {
1.249 + str->iovCur->iov_len -= bytes;
1.250 + str->iovCur->iov_base = (void *)
1.251 + ((u_char *)str->iovCur->iov_base + bytes);
1.252 + str->ioDone += bytes;
1.253 + bytes = 0;
1.254 + } else {
1.255 + bytes -= str->iovCur->iov_len;
1.256 + str->ioDone += str->iovCur->iov_len;
1.257 + str->iovCur++;
1.258 + str->iovCurCount--;
1.259 + }
1.260 + }
1.261 +}
1.262 +
1.263 +/* Add a stream to Done list and deselect the FD. */
1.264 +static void
1.265 +done(evContext opaqueCtx, evStream *str) {
1.266 + evContext_p *ctx = opaqueCtx.opaque;
1.267 +
1.268 + if (ctx->strLast != NULL) {
1.269 + str->prevDone = ctx->strLast;
1.270 + ctx->strLast->nextDone = str;
1.271 + ctx->strLast = str;
1.272 + } else {
1.273 + INSIST(ctx->strDone == NULL);
1.274 + ctx->strDone = ctx->strLast = str;
1.275 + }
1.276 + evDeselectFD(opaqueCtx, str->file);
1.277 + str->file.opaque = NULL;
1.278 + /* evDrop() will call evCancelRW() on us. */
1.279 +}
1.280 +
1.281 +/* Dribble out some bytes on the stream. (Called by evDispatch().) */
1.282 +static void
1.283 +writable(evContext opaqueCtx, void *uap, int fd, int evmask) {
1.284 + evStream *str = uap;
1.285 + int bytes;
1.286 +
1.287 + UNUSED(evmask);
1.288 +
1.289 + bytes = writev(fd, str->iovCur, str->iovCurCount);
1.290 + if (bytes > 0) {
1.291 + if ((str->flags & EV_STR_TIMEROK) != 0)
1.292 + evTouchIdleTimer(opaqueCtx, str->timer);
1.293 + consume(str, bytes);
1.294 + } else {
1.295 + if (bytes < 0 && errno != EINTR) {
1.296 + str->ioDone = -1;
1.297 + str->ioErrno = errno;
1.298 + }
1.299 + }
1.300 + if (str->ioDone == -1 || str->ioDone == str->ioTotal)
1.301 + done(opaqueCtx, str);
1.302 +}
1.303 +
1.304 +/* Scoop up some bytes from the stream. (Called by evDispatch().) */
1.305 +static void
1.306 +readable(evContext opaqueCtx, void *uap, int fd, int evmask) {
1.307 + evStream *str = uap;
1.308 + int bytes;
1.309 +
1.310 + UNUSED(evmask);
1.311 +
1.312 + bytes = readv(fd, str->iovCur, str->iovCurCount);
1.313 + if (bytes > 0) {
1.314 + if ((str->flags & EV_STR_TIMEROK) != 0)
1.315 + evTouchIdleTimer(opaqueCtx, str->timer);
1.316 + consume(str, bytes);
1.317 + } else {
1.318 + if (bytes == 0)
1.319 + str->ioDone = 0;
1.320 + else {
1.321 + if (errno != EINTR) {
1.322 + str->ioDone = -1;
1.323 + str->ioErrno = errno;
1.324 + }
1.325 + }
1.326 + }
1.327 + if (str->ioDone <= 0 || str->ioDone == str->ioTotal)
1.328 + done(opaqueCtx, str);
1.329 +}
1.330 +#endif
1.331 +#endif
