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 | |
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40 | #ifndef _WIN32 |
32 | /* for unix systems */ |
41 | /* for unix systems */ |
33 | #if WIN32 |
42 | # include <sys/select.h> |
34 | typedef unsigned int uint32_t; |
43 | # include <inttypes.h> |
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44 | #endif |
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45 | |
35 | # ifndef EV_SELECT_USE_FD_SET |
46 | #ifndef EV_SELECT_USE_FD_SET |
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47 | # ifdef NFDBITS |
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48 | # define EV_SELECT_USE_FD_SET 0 |
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49 | # else |
36 | # define EV_SELECT_USE_FD_SET 1 |
50 | # define EV_SELECT_USE_FD_SET 1 |
37 | # endif |
51 | # endif |
38 | #else |
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39 | # include <sys/select.h> |
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40 | # include <inttypes.h> |
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41 | #endif |
52 | #endif |
42 | |
53 | |
43 | #if EV_SELECT_USE_WIN32_HANDLES |
54 | #if EV_SELECT_IS_WINSOCKET |
44 | # undef EV_SELECT_USE_FD_SET |
55 | # undef EV_SELECT_USE_FD_SET |
45 | # define EV_SELECT_USE_FD_SET 1 |
56 | # define EV_SELECT_USE_FD_SET 1 |
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57 | # undef NFDBITS |
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58 | # define NFDBITS 0 |
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59 | #endif |
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60 | |
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61 | #if !EV_SELECT_USE_FD_SET |
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62 | # define NFDBYTES (NFDBITS / 8) |
46 | #endif |
63 | #endif |
47 | |
64 | |
48 | #include <string.h> |
65 | #include <string.h> |
49 | |
66 | |
50 | static void |
67 | static void |
51 | select_modify (EV_P_ int fd, int oev, int nev) |
68 | select_modify (EV_P_ int fd, int oev, int nev) |
52 | { |
69 | { |
53 | if (oev == nev) |
70 | if (oev == nev) |
54 | return; |
71 | return; |
55 | |
72 | |
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73 | { |
56 | #if EV_SELECT_USE_FD_SET |
74 | #if EV_SELECT_USE_FD_SET |
57 | # if EV_SELECT_USE_WIN32_HANDLES |
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58 | fd = _get_osfhandle (fd); |
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59 | if (fd < 0) |
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60 | return; |
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61 | # endif |
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62 | |
75 | |
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76 | #if EV_SELECT_IS_WINSOCKET |
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77 | SOCKET handle = anfds [fd].handle; |
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78 | #else |
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79 | int handle = fd; |
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80 | #endif |
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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 |
63 | if (nev & EV_READ) |
90 | if (nev & EV_READ) |
64 | FD_SET (fd, (struct fd_set *)vec_ri); |
91 | FD_SET (handle, (fd_set *)vec_ri); |
65 | else |
92 | else |
66 | FD_CLR (fd, (struct fd_set *)vec_ri); |
93 | FD_CLR (handle, (fd_set *)vec_ri); |
67 | |
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 |
68 | if (nev & EV_WRITE) |
98 | if (nev & EV_WRITE) |
69 | FD_SET (fd, (struct fd_set *)vec_wi); |
99 | FD_SET (handle, (fd_set *)vec_wi); |
70 | else |
100 | else |
71 | FD_CLR (fd, (struct fd_set *)vec_wi); |
101 | FD_CLR (handle, (fd_set *)vec_wi); |
72 | #else |
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73 | { |
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74 | int offs = fd >> 3; |
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75 | int mask = 1 << (fd & 7); |
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76 | |
102 | |
77 | if (vec_max < (fd >> 5) + 1) |
103 | #else |
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104 | |
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105 | int word = fd / NFDBITS; |
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106 | fd_mask mask = 1UL << (fd % NFDBITS); |
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107 | |
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108 | if (expect_false (vec_max <= word)) |
78 | { |
109 | { |
79 | int new_max = (fd >> 5) + 1; |
110 | int new_max = word + 1; |
80 | |
111 | |
81 | vec_ri = (unsigned char *)ev_realloc (vec_ri, new_max * 4); |
112 | vec_ri = ev_realloc (vec_ri, new_max * NFDBYTES); |
82 | vec_ro = (unsigned char *)ev_realloc (vec_ro, new_max * 4); /* could free/malloc */ |
113 | vec_ro = ev_realloc (vec_ro, new_max * NFDBYTES); /* could free/malloc */ |
83 | vec_wi = (unsigned char *)ev_realloc (vec_wi, new_max * 4); |
114 | vec_wi = ev_realloc (vec_wi, new_max * NFDBYTES); |
84 | vec_wo = (unsigned char *)ev_realloc (vec_wo, new_max * 4); /* 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 |
85 | |
119 | |
86 | for (; vec_max < new_max; ++vec_max) |
120 | for (; vec_max < new_max; ++vec_max) |
87 | ((uint32_t *)vec_ri)[vec_max] = |
121 | ((fd_mask *)vec_ri) [vec_max] = |
88 | ((uint32_t *)vec_wi)[vec_max] = 0; |
122 | ((fd_mask *)vec_wi) [vec_max] = 0; |
89 | } |
123 | } |
90 | |
124 | |
91 | vec_ri [offs] |= mask; |
125 | ((fd_mask *)vec_ri) [word] |= mask; |
92 | if (!(nev & EV_READ)) |
126 | if (!(nev & EV_READ)) |
93 | vec_ri [offs] &= ~mask; |
127 | ((fd_mask *)vec_ri) [word] &= ~mask; |
94 | |
128 | |
95 | vec_wi [offs] |= mask; |
129 | ((fd_mask *)vec_wi) [word] |= mask; |
96 | if (!(nev & EV_WRITE)) |
130 | if (!(nev & EV_WRITE)) |
97 | vec_wi [offs] &= ~mask; |
131 | ((fd_mask *)vec_wi) [word] &= ~mask; |
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132 | #endif |
98 | } |
133 | } |
99 | #endif |
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100 | } |
134 | } |
101 | |
135 | |
102 | static void |
136 | static void |
103 | select_poll (EV_P_ ev_tstamp timeout) |
137 | select_poll (EV_P_ ev_tstamp timeout) |
104 | { |
138 | { |
105 | int word, offs; |
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106 | struct timeval tv; |
139 | struct timeval tv; |
107 | int res; |
140 | int res; |
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141 | int fd_setsize; |
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142 | |
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143 | EV_RELEASE_CB; |
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144 | EV_TV_SET (tv, timeout); |
108 | |
145 | |
109 | #if EV_SELECT_USE_FD_SET |
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 | |
110 | memcpy (vec_ro, vec_ri, sizeof (struct fd_set)); |
152 | memcpy (vec_ro, vec_ri, fd_setsize); |
111 | memcpy (vec_wo, vec_wi, sizeof (struct fd_set)); |
153 | memcpy (vec_wo, vec_wi, fd_setsize); |
112 | #else |
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113 | memcpy (vec_ro, vec_ri, vec_max * 4); |
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114 | memcpy (vec_wo, vec_wi, vec_max * 4); |
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115 | #endif |
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116 | |
154 | |
117 | tv.tv_sec = (long)timeout; |
155 | #ifdef _WIN32 |
118 | tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6); |
156 | /* pass in the write set as except set. |
119 | |
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 |
120 | res = select (vec_max * 32, (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 |
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169 | EV_ACQUIRE_CB; |
121 | |
170 | |
122 | if (res < 0) |
171 | if (expect_false (res < 0)) |
123 | { |
172 | { |
124 | #ifdef WIN32 |
173 | #if EV_SELECT_IS_WINSOCKET |
125 | if (errno == WSAEINTR ) errno = EINTR; |
174 | errno = WSAGetLastError (); |
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175 | #endif |
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176 | #ifdef WSABASEERR |
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177 | /* on windows, select returns incompatible error codes, fix this */ |
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178 | if (errno >= WSABASEERR && errno < WSABASEERR + 1000) |
126 | if (errno == WSAENOTSOCK) errno = EBADF; |
179 | if (errno == WSAENOTSOCK) |
127 | #endif |
180 | errno = EBADF; |
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181 | else |
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182 | errno -= WSABASEERR; |
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183 | #endif |
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184 | |
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185 | #ifdef _WIN32 |
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186 | /* select on windows erroneously returns EINVAL when no fd sets have been |
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187 | * provided (this is documented). what microsoft doesn't tell you that this bug |
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188 | * exists even when the fd sets _are_ provided, so we have to check for this bug |
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189 | * here and emulate by sleeping manually. |
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190 | * we also get EINVAL when the timeout is invalid, but we ignore this case here |
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191 | * and assume that EINVAL always means: you have to wait manually. |
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192 | */ |
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193 | if (errno == EINVAL) |
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194 | { |
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195 | ev_sleep (timeout); |
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196 | return; |
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197 | } |
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198 | #endif |
128 | |
199 | |
129 | if (errno == EBADF) |
200 | if (errno == EBADF) |
130 | fd_ebadf (EV_A); |
201 | fd_ebadf (EV_A); |
131 | else if (errno == ENOMEM && !syserr_cb) |
202 | else if (errno == ENOMEM && !syserr_cb) |
132 | fd_enomem (EV_A); |
203 | fd_enomem (EV_A); |
133 | else if (errno != EINTR) |
204 | else if (errno != EINTR) |
134 | syserr ("(libev) select"); |
205 | ev_syserr ("(libev) select"); |
135 | |
206 | |
136 | return; |
207 | return; |
137 | } |
208 | } |
138 | |
209 | |
139 | #if EV_SELECT_USE_FD_SET |
210 | #if EV_SELECT_USE_FD_SET |
140 | # if EV_SELECT_USE_WIN32_HANDLES |
211 | |
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212 | { |
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213 | int fd; |
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214 | |
141 | for (word = 0; word < anfdmax; ++word) |
215 | for (fd = 0; fd < anfdmax; ++fd) |
142 | { |
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143 | if (!anfd [word].events) |
216 | if (anfds [fd].events) |
144 | { |
217 | { |
145 | int fd = _get_osfhandle (word); |
218 | int events = 0; |
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219 | #if EV_SELECT_IS_WINSOCKET |
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220 | SOCKET handle = anfds [fd].handle; |
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221 | #else |
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222 | int handle = fd; |
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223 | #endif |
146 | |
224 | |
147 | if (fd >= 0) |
225 | if (FD_ISSET (handle, (fd_set *)vec_ro)) events |= EV_READ; |
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226 | if (FD_ISSET (handle, (fd_set *)vec_wo)) events |= EV_WRITE; |
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227 | #ifdef _WIN32 |
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228 | if (FD_ISSET (handle, (fd_set *)vec_eo)) events |= EV_WRITE; |
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229 | #endif |
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230 | |
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231 | if (expect_true (events)) |
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232 | fd_event (EV_A_ fd, events); |
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233 | } |
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234 | } |
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235 | |
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236 | #else |
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237 | |
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238 | { |
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239 | int word, bit; |
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240 | for (word = vec_max; word--; ) |
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241 | { |
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242 | fd_mask word_r = ((fd_mask *)vec_ro) [word]; |
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243 | fd_mask word_w = ((fd_mask *)vec_wo) [word]; |
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244 | #ifdef _WIN32 |
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245 | word_w |= ((fd_mask *)vec_eo) [word]; |
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246 | #endif |
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247 | |
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248 | if (word_r || word_w) |
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249 | for (bit = NFDBITS; bit--; ) |
148 | { |
250 | { |
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251 | fd_mask mask = 1UL << bit; |
149 | int events = 0; |
252 | int events = 0; |
150 | |
253 | |
151 | if (FD_ISSET (fd, (struct fd_set *)vec_ro)) events |= EV_READ; |
254 | events |= word_r & mask ? EV_READ : 0; |
152 | if (FD_ISSET (fd, (struct fd_set *)vec_wo)) events |= EV_WRITE; |
255 | events |= word_w & mask ? EV_WRITE : 0; |
153 | |
256 | |
154 | if (events) |
257 | if (expect_true (events)) |
155 | fd_event (EV_A_ word, events); |
258 | fd_event (EV_A_ word * NFDBITS + bit, events); |
156 | } |
259 | } |
157 | } |
260 | } |
158 | } |
261 | } |
159 | # else |
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160 | for (word = 0; word < FD_SETSIZE; ++word) |
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161 | { |
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162 | int events = 0; |
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163 | if (FD_ISSET (word, (struct fd_set *)vec_ro)) events |= EV_READ; |
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164 | if (FD_ISSET (word, (struct fd_set *)vec_wo)) events |= EV_WRITE; |
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165 | |
262 | |
166 | if (events) |
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167 | fd_event (EV_A_ word, events); |
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168 | } |
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169 | # endif |
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170 | #else |
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171 | for (word = vec_max; word--; ) |
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172 | { |
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173 | if (((uint32_t *)vec_ro) [word] | ((uint32_t *)vec_wo) [word]) |
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174 | for (offs = 4; offs--; ) |
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175 | { |
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176 | int idx = word * 4 + offs; |
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177 | unsigned char byte_r = vec_ro [idx]; |
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178 | unsigned char byte_w = vec_wo [idx]; |
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179 | int bit; |
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180 | |
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181 | if (byte_r | byte_w) |
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182 | for (bit = 8; bit--; ) |
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183 | { |
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184 | int events = 0; |
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185 | events |= byte_r & (1 << bit) ? EV_READ : 0; |
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186 | events |= byte_w & (1 << bit) ? EV_WRITE : 0; |
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187 | |
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188 | if (events) |
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189 | fd_event (EV_A_ idx * 8 + bit, events); |
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190 | } |
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191 | } |
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192 | } |
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193 | #endif |
263 | #endif |
194 | } |
264 | } |
195 | |
265 | |
196 | static int |
266 | int inline_size |
197 | select_init (EV_P_ int flags) |
267 | select_init (EV_P_ int flags) |
198 | { |
268 | { |
199 | method_fudge = 1e-2; /* needed to compensate for select returning early, very conservative */ |
269 | backend_fudge = 0.; /* posix says this is zero */ |
200 | method_modify = select_modify; |
270 | backend_modify = select_modify; |
201 | method_poll = select_poll; |
271 | backend_poll = select_poll; |
202 | |
272 | |
203 | #if EV_SELECT_USE_FD_SET |
273 | #if EV_SELECT_USE_FD_SET |
204 | vec_max = FD_SETSIZE / 32; |
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205 | vec_ri = ev_malloc (sizeof (struct fd_set)); FD_ZERO ((struct fd_set *)vec_ri); |
274 | vec_ri = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_ri); |
206 | vec_ro = ev_malloc (sizeof (struct fd_set)); |
275 | vec_ro = ev_malloc (sizeof (fd_set)); |
207 | vec_wi = ev_malloc (sizeof (struct fd_set)); FD_ZERO ((struct fd_set *)vec_wi); |
276 | vec_wi = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_wi); |
208 | vec_wo = ev_malloc (sizeof (struct fd_set)); |
277 | vec_wo = ev_malloc (sizeof (fd_set)); |
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278 | #ifdef _WIN32 |
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279 | vec_eo = ev_malloc (sizeof (fd_set)); |
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280 | #endif |
209 | #else |
281 | #else |
210 | vec_max = 0; |
282 | vec_max = 0; |
211 | vec_ri = 0; |
283 | vec_ri = 0; |
212 | vec_ri = 0; |
284 | vec_ro = 0; |
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285 | vec_wi = 0; |
213 | vec_wo = 0; |
286 | vec_wo = 0; |
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287 | #ifdef _WIN32 |
214 | vec_wo = 0; |
288 | vec_eo = 0; |
215 | #endif |
289 | #endif |
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290 | #endif |
216 | |
291 | |
217 | return EVMETHOD_SELECT; |
292 | return EVBACKEND_SELECT; |
218 | } |
293 | } |
219 | |
294 | |
220 | static void |
295 | void inline_size |
221 | select_destroy (EV_P) |
296 | select_destroy (EV_P) |
222 | { |
297 | { |
223 | ev_free (vec_ri); |
298 | ev_free (vec_ri); |
224 | ev_free (vec_ro); |
299 | ev_free (vec_ro); |
225 | ev_free (vec_wi); |
300 | ev_free (vec_wi); |
226 | ev_free (vec_wo); |
301 | ev_free (vec_wo); |
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302 | #ifdef _WIN32 |
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303 | ev_free (vec_eo); |
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304 | #endif |
227 | } |
305 | } |
228 | |
306 | |
229 | |
307 | |