| 1 | /* for broken bsd's */ |
1 | /* |
| 2 | #include <sys/time.h> |
2 | * libev select fd activity backend |
| 3 | #include <sys/types.h> |
3 | * |
| 4 | #include <unistd.h> |
4 | * Copyright (c) 2007,2008,2009 Marc Alexander Lehmann <libev@schmorp.de> |
|
|
5 | * All rights reserved. |
|
|
6 | * |
|
|
7 | * Redistribution and use in source and binary forms, with or without modifica- |
|
|
8 | * tion, are permitted provided that the following conditions are met: |
|
|
9 | * |
|
|
10 | * 1. Redistributions of source code must retain the above copyright notice, |
|
|
11 | * this list of conditions and the following disclaimer. |
|
|
12 | * |
|
|
13 | * 2. Redistributions in binary form must reproduce the above copyright |
|
|
14 | * notice, this list of conditions and the following disclaimer in the |
|
|
15 | * documentation and/or other materials provided with the distribution. |
|
|
16 | * |
|
|
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
|
|
18 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- |
|
|
19 | * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
|
|
20 | * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- |
|
|
21 | * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
|
|
22 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
|
|
23 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
|
|
24 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- |
|
|
25 | * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
|
|
26 | * OF THE POSSIBILITY OF SUCH DAMAGE. |
|
|
27 | * |
|
|
28 | * Alternatively, the contents of this file may be used under the terms of |
|
|
29 | * the GNU General Public License ("GPL") version 2 or any later version, |
|
|
30 | * in which case the provisions of the GPL are applicable instead of |
|
|
31 | * the above. If you wish to allow the use of your version of this file |
|
|
32 | * only under the terms of the GPL and not to allow others to use your |
|
|
33 | * version of this file under the BSD license, indicate your decision |
|
|
34 | * by deleting the provisions above and replace them with the notice |
|
|
35 | * and other provisions required by the GPL. If you do not delete the |
|
|
36 | * provisions above, a recipient may use your version of this file under |
|
|
37 | * either the BSD or the GPL. |
|
|
38 | */ |
| 5 | |
39 | |
|
|
40 | #ifndef _WIN32 |
| 6 | /* for unix systems */ |
41 | /* for unix systems */ |
| 7 | #include <sys/select.h> |
42 | # include <sys/select.h> |
|
|
43 | # include <inttypes.h> |
|
|
44 | #endif |
|
|
45 | |
|
|
46 | #ifndef EV_SELECT_USE_FD_SET |
|
|
47 | # ifdef NFDBITS |
|
|
48 | # define EV_SELECT_USE_FD_SET 0 |
|
|
49 | # else |
|
|
50 | # define EV_SELECT_USE_FD_SET 1 |
|
|
51 | # endif |
|
|
52 | #endif |
|
|
53 | |
|
|
54 | #if EV_SELECT_IS_WINSOCKET |
|
|
55 | # undef EV_SELECT_USE_FD_SET |
|
|
56 | # define EV_SELECT_USE_FD_SET 1 |
|
|
57 | # undef NFDBITS |
|
|
58 | # define NFDBITS 0 |
|
|
59 | #endif |
|
|
60 | |
|
|
61 | #if !EV_SELECT_USE_FD_SET |
|
|
62 | # define NFDBYTES (NFDBITS / 8) |
|
|
63 | #endif |
| 8 | |
64 | |
| 9 | #include <string.h> |
65 | #include <string.h> |
| 10 | #include <inttypes.h> |
|
|
| 11 | |
|
|
| 12 | static unsigned char *vec_ri, *vec_ro, *vec_wi, *vec_wo; |
|
|
| 13 | static int vec_max; |
|
|
| 14 | |
66 | |
| 15 | static void |
67 | static void |
| 16 | select_modify (int fd, int oev, int nev) |
68 | select_modify (EV_P_ int fd, int oev, int nev) |
| 17 | { |
69 | { |
| 18 | int offs = fd >> 3; |
70 | if (oev == nev) |
| 19 | int mask = 1 << (fd & 7); |
71 | return; |
| 20 | |
72 | |
| 21 | if (vec_max < (fd >> 5) + 1) |
73 | { |
|
|
74 | #if EV_SELECT_USE_FD_SET |
|
|
75 | |
|
|
76 | #if EV_SELECT_IS_WINSOCKET |
|
|
77 | SOCKET handle = anfds [fd].handle; |
|
|
78 | #else |
|
|
79 | int handle = fd; |
|
|
80 | #endif |
|
|
81 | |
|
|
82 | assert (("libev: fd >= FD_SETSIZE passed to fd_set-based select backend", fd < FD_SETSIZE)); |
|
|
83 | |
|
|
84 | /* FD_SET is broken on windows (it adds the fd to a set twice or more, |
|
|
85 | * which eventually leads to overflows). Need to call it only on changes. |
|
|
86 | */ |
|
|
87 | #if EV_SELECT_IS_WINSOCKET |
|
|
88 | if ((oev ^ nev) & EV_READ) |
|
|
89 | #endif |
|
|
90 | if (nev & EV_READ) |
|
|
91 | FD_SET (handle, (fd_set *)vec_ri); |
|
|
92 | else |
|
|
93 | FD_CLR (handle, (fd_set *)vec_ri); |
|
|
94 | |
|
|
95 | #if EV_SELECT_IS_WINSOCKET |
|
|
96 | if ((oev ^ nev) & EV_WRITE) |
|
|
97 | #endif |
|
|
98 | if (nev & EV_WRITE) |
|
|
99 | FD_SET (handle, (fd_set *)vec_wi); |
|
|
100 | else |
|
|
101 | FD_CLR (handle, (fd_set *)vec_wi); |
|
|
102 | |
|
|
103 | #else |
|
|
104 | |
|
|
105 | int word = fd / NFDBITS; |
|
|
106 | fd_mask mask = 1UL << (fd % NFDBITS); |
|
|
107 | |
|
|
108 | if (expect_false (vec_max <= word)) |
| 22 | { |
109 | { |
| 23 | vec_max = (fd >> 5) + 1; |
110 | int new_max = word + 1; |
| 24 | |
111 | |
| 25 | vec_ri = (unsigned char *)realloc (vec_ri, vec_max * 4); |
112 | vec_ri = ev_realloc (vec_ri, new_max * NFDBYTES); |
| 26 | vec_ro = (unsigned char *)realloc (vec_ro, vec_max * 4); /* could free/malloc */ |
113 | vec_ro = ev_realloc (vec_ro, new_max * NFDBYTES); /* could free/malloc */ |
| 27 | vec_wi = (unsigned char *)realloc (vec_wi, vec_max * 4); |
114 | vec_wi = ev_realloc (vec_wi, new_max * NFDBYTES); |
| 28 | vec_wo = (unsigned char *)realloc (vec_wo, vec_max * 4); /* could free/malloc */ |
115 | vec_wo = ev_realloc (vec_wo, new_max * NFDBYTES); /* could free/malloc */ |
|
|
116 | #ifdef _WIN32 |
|
|
117 | vec_eo = ev_realloc (vec_eo, new_max * NFDBYTES); /* could free/malloc */ |
|
|
118 | #endif |
|
|
119 | |
|
|
120 | for (; vec_max < new_max; ++vec_max) |
|
|
121 | ((fd_mask *)vec_ri) [vec_max] = |
|
|
122 | ((fd_mask *)vec_wi) [vec_max] = 0; |
| 29 | } |
123 | } |
| 30 | |
124 | |
| 31 | vec_ri [offs] |= mask; |
125 | ((fd_mask *)vec_ri) [word] |= mask; |
| 32 | if (!(nev & EV_READ)) |
126 | if (!(nev & EV_READ)) |
| 33 | vec_ri [offs] &= ~mask; |
127 | ((fd_mask *)vec_ri) [word] &= ~mask; |
| 34 | |
128 | |
| 35 | vec_wi [offs] |= mask; |
129 | ((fd_mask *)vec_wi) [word] |= mask; |
| 36 | if (!(nev & EV_WRITE)) |
130 | if (!(nev & EV_WRITE)) |
| 37 | vec_wi [offs] &= ~mask; |
131 | ((fd_mask *)vec_wi) [word] &= ~mask; |
|
|
132 | #endif |
|
|
133 | } |
| 38 | } |
134 | } |
| 39 | |
135 | |
|
|
136 | static void |
| 40 | static void select_poll (ev_tstamp timeout) |
137 | select_poll (EV_P_ ev_tstamp timeout) |
| 41 | { |
138 | { |
| 42 | struct timeval tv; |
139 | struct timeval tv; |
| 43 | int res; |
140 | int res; |
|
|
141 | int fd_setsize; |
| 44 | |
142 | |
| 45 | memcpy (vec_ro, vec_ri, vec_max * 4); |
143 | EV_SUSPEND_CB; |
| 46 | memcpy (vec_wo, vec_wi, vec_max * 4); |
|
|
| 47 | |
|
|
| 48 | tv.tv_sec = (long)timeout; |
144 | tv.tv_sec = (long)timeout; |
| 49 | tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6); |
145 | tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6); |
| 50 | |
146 | |
|
|
147 | #if EV_SELECT_USE_FD_SET |
|
|
148 | fd_setsize = sizeof (fd_set); |
|
|
149 | #else |
|
|
150 | fd_setsize = vec_max * NFDBYTES; |
|
|
151 | #endif |
|
|
152 | |
|
|
153 | memcpy (vec_ro, vec_ri, fd_setsize); |
|
|
154 | memcpy (vec_wo, vec_wi, fd_setsize); |
|
|
155 | |
|
|
156 | #ifdef _WIN32 |
|
|
157 | /* pass in the write set as except set. |
|
|
158 | * the idea behind this is to work around a windows bug that causes |
|
|
159 | * errors to be reported as an exception and not by setting |
|
|
160 | * the writable bit. this is so uncontrollably lame. |
|
|
161 | */ |
|
|
162 | memcpy (vec_eo, vec_wi, fd_setsize); |
|
|
163 | res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, (fd_set *)vec_eo, &tv); |
|
|
164 | #elif EV_SELECT_USE_FD_SET |
|
|
165 | fd_setsize = anfdmax < FD_SETSIZE ? anfdmax : FD_SETSIZE; |
|
|
166 | res = select (fd_setsize, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); |
|
|
167 | #else |
| 51 | res = select (vec_max * 32, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); |
168 | res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); |
|
|
169 | #endif |
|
|
170 | EV_RESUME_CB; |
| 52 | |
171 | |
| 53 | if (res > 0) |
172 | if (expect_false (res < 0)) |
| 54 | { |
173 | { |
| 55 | int word, offs; |
174 | #if EV_SELECT_IS_WINSOCKET |
|
|
175 | errno = WSAGetLastError (); |
|
|
176 | #endif |
|
|
177 | #ifdef WSABASEERR |
|
|
178 | /* on windows, select returns incompatible error codes, fix this */ |
|
|
179 | if (errno >= WSABASEERR && errno < WSABASEERR + 1000) |
|
|
180 | if (errno == WSAENOTSOCK) |
|
|
181 | errno = EBADF; |
|
|
182 | else |
|
|
183 | errno -= WSABASEERR; |
|
|
184 | #endif |
| 56 | |
185 | |
| 57 | for (word = vec_max; word--; ) |
186 | #ifdef _WIN32 |
|
|
187 | /* select on windows errornously returns EINVAL when no fd sets have been |
|
|
188 | * provided (this is documented). what microsoft doesn't tell you that this bug |
|
|
189 | * exists even when the fd sets _are_ provided, so we have to check for this bug |
|
|
190 | * here and emulate by sleeping manually. |
|
|
191 | * we also get EINVAL when the timeout is invalid, but we ignore this case here |
|
|
192 | * and assume that EINVAL always means: you have to wait manually. |
|
|
193 | */ |
|
|
194 | if (errno == EINVAL) |
| 58 | { |
195 | { |
| 59 | if (((uint32_t *)vec_ro) [word] | ((uint32_t *)vec_wo) [word]) |
196 | ev_sleep (timeout); |
| 60 | for (offs = 4; offs--; ) |
197 | return; |
| 61 | { |
|
|
| 62 | int idx = word * 4 + offs; |
|
|
| 63 | unsigned char byte_r = vec_ro [idx]; |
|
|
| 64 | unsigned char byte_w = vec_wo [idx]; |
|
|
| 65 | int bit; |
|
|
| 66 | |
|
|
| 67 | if (byte_r | byte_w) |
|
|
| 68 | for (bit = 8; bit--; ) |
|
|
| 69 | { |
|
|
| 70 | int events = 0; |
|
|
| 71 | events |= byte_r & (1 << bit) ? EV_READ : 0; |
|
|
| 72 | events |= byte_w & (1 << bit) ? EV_WRITE : 0; |
|
|
| 73 | |
|
|
| 74 | if (events) |
|
|
| 75 | fd_event (idx * 8 + bit, events); |
|
|
| 76 | } |
|
|
| 77 | } |
|
|
| 78 | } |
198 | } |
|
|
199 | #endif |
|
|
200 | |
|
|
201 | if (errno == EBADF) |
|
|
202 | fd_ebadf (EV_A); |
|
|
203 | else if (errno == ENOMEM && !syserr_cb) |
|
|
204 | fd_enomem (EV_A); |
|
|
205 | else if (errno != EINTR) |
|
|
206 | ev_syserr ("(libev) select"); |
|
|
207 | |
|
|
208 | return; |
| 79 | } |
209 | } |
|
|
210 | |
|
|
211 | #if EV_SELECT_USE_FD_SET |
|
|
212 | |
|
|
213 | { |
|
|
214 | int fd; |
|
|
215 | |
|
|
216 | for (fd = 0; fd < anfdmax; ++fd) |
|
|
217 | if (anfds [fd].events) |
|
|
218 | { |
|
|
219 | int events = 0; |
|
|
220 | #if EV_SELECT_IS_WINSOCKET |
|
|
221 | SOCKET handle = anfds [fd].handle; |
|
|
222 | #else |
|
|
223 | int handle = fd; |
|
|
224 | #endif |
|
|
225 | |
|
|
226 | if (FD_ISSET (handle, (fd_set *)vec_ro)) events |= EV_READ; |
|
|
227 | if (FD_ISSET (handle, (fd_set *)vec_wo)) events |= EV_WRITE; |
|
|
228 | #ifdef _WIN32 |
|
|
229 | if (FD_ISSET (handle, (fd_set *)vec_eo)) events |= EV_WRITE; |
|
|
230 | #endif |
|
|
231 | |
|
|
232 | if (expect_true (events)) |
|
|
233 | fd_event (EV_A_ fd, events); |
|
|
234 | } |
|
|
235 | } |
|
|
236 | |
|
|
237 | #else |
|
|
238 | |
|
|
239 | { |
|
|
240 | int word, bit; |
|
|
241 | for (word = vec_max; word--; ) |
|
|
242 | { |
|
|
243 | fd_mask word_r = ((fd_mask *)vec_ro) [word]; |
|
|
244 | fd_mask word_w = ((fd_mask *)vec_wo) [word]; |
|
|
245 | #ifdef _WIN32 |
|
|
246 | word_w |= ((fd_mask *)vec_eo) [word]; |
|
|
247 | #endif |
|
|
248 | |
|
|
249 | if (word_r || word_w) |
|
|
250 | for (bit = NFDBITS; bit--; ) |
|
|
251 | { |
|
|
252 | fd_mask mask = 1UL << bit; |
|
|
253 | int events = 0; |
|
|
254 | |
|
|
255 | events |= word_r & mask ? EV_READ : 0; |
|
|
256 | events |= word_w & mask ? EV_WRITE : 0; |
|
|
257 | |
|
|
258 | if (expect_true (events)) |
|
|
259 | fd_event (EV_A_ word * NFDBITS + bit, events); |
|
|
260 | } |
|
|
261 | } |
|
|
262 | } |
|
|
263 | |
|
|
264 | #endif |
| 80 | } |
265 | } |
| 81 | |
266 | |
|
|
267 | int inline_size |
| 82 | void select_init (int flags) |
268 | select_init (EV_P_ int flags) |
| 83 | { |
269 | { |
| 84 | ev_method = EVMETHOD_SELECT; |
270 | backend_fudge = 0.; /* posix says this is zero */ |
| 85 | method_fudge = 1e-2; /* needed to compensate for select returning early, very conservative */ |
|
|
| 86 | method_modify = select_modify; |
271 | backend_modify = select_modify; |
| 87 | method_poll = select_poll; |
272 | backend_poll = select_poll; |
|
|
273 | |
|
|
274 | #if EV_SELECT_USE_FD_SET |
|
|
275 | vec_ri = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_ri); |
|
|
276 | vec_ro = ev_malloc (sizeof (fd_set)); |
|
|
277 | vec_wi = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_wi); |
|
|
278 | vec_wo = ev_malloc (sizeof (fd_set)); |
|
|
279 | #ifdef _WIN32 |
|
|
280 | vec_eo = ev_malloc (sizeof (fd_set)); |
|
|
281 | #endif |
|
|
282 | #else |
|
|
283 | vec_max = 0; |
|
|
284 | vec_ri = 0; |
|
|
285 | vec_ri = 0; |
|
|
286 | vec_wo = 0; |
|
|
287 | vec_wo = 0; |
|
|
288 | #endif |
|
|
289 | |
|
|
290 | return EVBACKEND_SELECT; |
| 88 | } |
291 | } |
| 89 | |
292 | |
|
|
293 | void inline_size |
|
|
294 | select_destroy (EV_P) |
|
|
295 | { |
|
|
296 | ev_free (vec_ri); |
|
|
297 | ev_free (vec_ro); |
|
|
298 | ev_free (vec_wi); |
|
|
299 | ev_free (vec_wo); |
|
|
300 | } |
| 90 | |
301 | |
|
|
302 | |
