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