other-licenses/android/ev_streams.c@6474c204b198
other-licenses/android/ev_streams.c
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
1 /* $NetBSD: ev_streams.c,v 1.2 2004/05/20 19:52:31 christos Exp $ */
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 */
20 /* ev_streams.c - implement asynch stream file IO for the eventlib
21 * vix 04mar96 [initial]
22 */
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 */
34 #define ANDROID_CHANGES 1
35 #define MOZILLA_NECKO_EXCLUDE_CODE 1
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
46 #include <sys/types.h>
47 #include <sys/uio.h>
49 #include <errno.h>
51 #include "eventlib.h"
52 #include "eventlib_p.h"
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
64 struct iovec
65 evConsIovec(void *buf, size_t cnt) {
66 struct iovec ret;
68 memset(&ret, 0xf5, sizeof ret);
69 ret.iov_base = buf;
70 ret.iov_len = cnt;
71 return (ret);
72 }
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;
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 }
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;
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 }
144 int
145 evTimeRW(evContext opaqueCtx, evStreamID id, evTimerID timer) /*ARGSUSED*/ {
146 evStream *str = id.opaque;
148 UNUSED(opaqueCtx);
150 str->timer = timer;
151 str->flags |= EV_STR_TIMEROK;
152 return (0);
153 }
155 int
156 evUntimeRW(evContext opaqueCtx, evStreamID id) /*ARGSUSED*/ {
157 evStream *str = id.opaque;
159 UNUSED(opaqueCtx);
161 str->flags &= ~EV_STR_TIMEROK;
162 return (0);
163 }
165 int
166 evCancelRW(evContext opaqueCtx, evStreamID id) {
167 evContext_p *ctx = opaqueCtx.opaque;
168 evStream *old = id.opaque;
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 */
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;
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 }
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 }
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;
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 }
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 }
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;
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 }
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;
284 UNUSED(evmask);
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 }
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;
307 UNUSED(evmask);
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
