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