| 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) 2007,2008,2009,2010 Marc Alexander Lehmann <libev@schmorp.de> |
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5 | * All rights reserved. |
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6 | * |
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7 | * Redistribution and use in source and binary forms, with or without modifica- |
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8 | * tion, are permitted provided that the following conditions are met: |
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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. |
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27 | * |
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28 | * Alternatively, the contents of this file may be used under the terms of |
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29 | * the GNU General Public License ("GPL") version 2 or any later version, |
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30 | * in which case the provisions of the GPL are applicable instead of |
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31 | * the above. If you wish to allow the use of your version of this file |
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32 | * only under the terms of the GPL and not to allow others to use your |
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33 | * version of this file under the BSD license, indicate your decision |
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34 | * by deleting the provisions above and replace them with the notice |
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35 | * and other provisions required by the GPL. If you do not delete the |
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36 | * provisions above, a recipient may use your version of this file under |
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37 | * either the BSD or the GPL. |
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38 | */ |
| 5 | |
39 | |
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40 | #ifndef _WIN32 |
| 6 | /* for unix systems */ |
41 | /* for unix systems */ |
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42 | # include <inttypes.h> |
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43 | # ifndef __hpux |
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44 | /* for REAL unix systems */ |
| 7 | #include <sys/select.h> |
45 | # include <sys/select.h> |
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46 | # endif |
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47 | #endif |
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48 | |
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49 | #ifndef EV_SELECT_USE_FD_SET |
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50 | # ifdef NFDBITS |
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51 | # define EV_SELECT_USE_FD_SET 0 |
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52 | # else |
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53 | # define EV_SELECT_USE_FD_SET 1 |
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54 | # endif |
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55 | #endif |
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56 | |
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57 | #if EV_SELECT_IS_WINSOCKET |
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58 | # undef EV_SELECT_USE_FD_SET |
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59 | # define EV_SELECT_USE_FD_SET 1 |
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60 | # undef NFDBITS |
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61 | # define NFDBITS 0 |
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62 | #endif |
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63 | |
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64 | #if !EV_SELECT_USE_FD_SET |
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65 | # define NFDBYTES (NFDBITS / 8) |
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66 | #endif |
| 8 | |
67 | |
| 9 | #include <string.h> |
68 | #include <string.h> |
| 10 | #include <inttypes.h> |
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| 11 | |
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| 12 | static unsigned char *vec_ri, *vec_ro, *vec_wi, *vec_wo; |
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| 13 | static int vec_max; |
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| 14 | |
69 | |
| 15 | static void |
70 | static void |
| 16 | select_modify (int fd, int oev, int nev) |
71 | select_modify (EV_P_ int fd, int oev, int nev) |
| 17 | { |
72 | { |
| 18 | int offs = fd >> 3; |
73 | if (oev == nev) |
| 19 | int mask = 1 << (fd & 7); |
74 | return; |
| 20 | |
75 | |
| 21 | if (vec_max < (fd >> 5) + 1) |
76 | { |
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77 | #if EV_SELECT_USE_FD_SET |
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78 | |
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79 | #if EV_SELECT_IS_WINSOCKET |
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80 | SOCKET handle = anfds [fd].handle; |
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81 | #else |
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82 | int handle = fd; |
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83 | #endif |
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84 | |
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85 | assert (("libev: fd >= FD_SETSIZE passed to fd_set-based select backend", fd < FD_SETSIZE)); |
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86 | |
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87 | /* FD_SET is broken on windows (it adds the fd to a set twice or more, |
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88 | * which eventually leads to overflows). Need to call it only on changes. |
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89 | */ |
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90 | #if EV_SELECT_IS_WINSOCKET |
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91 | if ((oev ^ nev) & EV_READ) |
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92 | #endif |
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93 | if (nev & EV_READ) |
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94 | FD_SET (handle, (fd_set *)vec_ri); |
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95 | else |
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96 | FD_CLR (handle, (fd_set *)vec_ri); |
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97 | |
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98 | #if EV_SELECT_IS_WINSOCKET |
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99 | if ((oev ^ nev) & EV_WRITE) |
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100 | #endif |
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101 | if (nev & EV_WRITE) |
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102 | FD_SET (handle, (fd_set *)vec_wi); |
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103 | else |
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104 | FD_CLR (handle, (fd_set *)vec_wi); |
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105 | |
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106 | #else |
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107 | |
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108 | int word = fd / NFDBITS; |
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109 | fd_mask mask = 1UL << (fd % NFDBITS); |
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110 | |
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111 | if (expect_false (vec_max <= word)) |
| 22 | { |
112 | { |
| 23 | vec_max = (fd >> 5) + 1; |
113 | int new_max = word + 1; |
| 24 | |
114 | |
| 25 | vec_ri = (unsigned char *)realloc (vec_ri, vec_max * 4); |
115 | vec_ri = ev_realloc (vec_ri, new_max * NFDBYTES); |
| 26 | vec_ro = (unsigned char *)realloc (vec_ro, vec_max * 4); /* could free/malloc */ |
116 | vec_ro = ev_realloc (vec_ro, new_max * NFDBYTES); /* could free/malloc */ |
| 27 | vec_wi = (unsigned char *)realloc (vec_wi, vec_max * 4); |
117 | vec_wi = ev_realloc (vec_wi, new_max * NFDBYTES); |
| 28 | vec_wo = (unsigned char *)realloc (vec_wo, vec_max * 4); /* could free/malloc */ |
118 | vec_wo = ev_realloc (vec_wo, new_max * NFDBYTES); /* could free/malloc */ |
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119 | #ifdef _WIN32 |
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120 | vec_eo = ev_realloc (vec_eo, new_max * NFDBYTES); /* could free/malloc */ |
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121 | #endif |
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122 | |
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123 | for (; vec_max < new_max; ++vec_max) |
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124 | ((fd_mask *)vec_ri) [vec_max] = |
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125 | ((fd_mask *)vec_wi) [vec_max] = 0; |
| 29 | } |
126 | } |
| 30 | |
127 | |
| 31 | vec_ri [offs] |= mask; |
128 | ((fd_mask *)vec_ri) [word] |= mask; |
| 32 | if (!(nev & EV_READ)) |
129 | if (!(nev & EV_READ)) |
| 33 | vec_ri [offs] &= ~mask; |
130 | ((fd_mask *)vec_ri) [word] &= ~mask; |
| 34 | |
131 | |
| 35 | vec_wi [offs] |= mask; |
132 | ((fd_mask *)vec_wi) [word] |= mask; |
| 36 | if (!(nev & EV_WRITE)) |
133 | if (!(nev & EV_WRITE)) |
| 37 | vec_wi [offs] &= ~mask; |
134 | ((fd_mask *)vec_wi) [word] &= ~mask; |
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135 | #endif |
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136 | } |
| 38 | } |
137 | } |
| 39 | |
138 | |
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139 | static void |
| 40 | static void select_poll (ev_tstamp timeout) |
140 | select_poll (EV_P_ ev_tstamp timeout) |
| 41 | { |
141 | { |
| 42 | struct timeval tv; |
142 | struct timeval tv; |
| 43 | int res; |
143 | int res; |
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144 | int fd_setsize; |
| 44 | |
145 | |
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146 | EV_RELEASE_CB; |
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147 | EV_TV_SET (tv, timeout); |
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148 | |
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149 | #if EV_SELECT_USE_FD_SET |
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150 | fd_setsize = sizeof (fd_set); |
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151 | #else |
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152 | fd_setsize = vec_max * NFDBYTES; |
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153 | #endif |
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154 | |
| 45 | memcpy (vec_ro, vec_ri, vec_max * 4); |
155 | memcpy (vec_ro, vec_ri, fd_setsize); |
| 46 | memcpy (vec_wo, vec_wi, vec_max * 4); |
156 | memcpy (vec_wo, vec_wi, fd_setsize); |
| 47 | |
157 | |
| 48 | tv.tv_sec = (long)timeout; |
158 | #ifdef _WIN32 |
| 49 | tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6); |
159 | /* pass in the write set as except set. |
| 50 | |
160 | * the idea behind this is to work around a windows bug that causes |
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161 | * errors to be reported as an exception and not by setting |
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162 | * the writable bit. this is so uncontrollably lame. |
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163 | */ |
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164 | memcpy (vec_eo, vec_wi, fd_setsize); |
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165 | res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, (fd_set *)vec_eo, &tv); |
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166 | #elif EV_SELECT_USE_FD_SET |
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167 | fd_setsize = anfdmax < FD_SETSIZE ? anfdmax : FD_SETSIZE; |
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168 | res = select (fd_setsize, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); |
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169 | #else |
| 51 | res = select (vec_max * 32, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); |
170 | res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); |
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171 | #endif |
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172 | EV_ACQUIRE_CB; |
| 52 | |
173 | |
| 53 | if (res > 0) |
174 | if (expect_false (res < 0)) |
| 54 | { |
175 | { |
| 55 | int word, offs; |
176 | #if EV_SELECT_IS_WINSOCKET |
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177 | errno = WSAGetLastError (); |
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178 | #endif |
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179 | #ifdef WSABASEERR |
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180 | /* on windows, select returns incompatible error codes, fix this */ |
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181 | if (errno >= WSABASEERR && errno < WSABASEERR + 1000) |
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182 | if (errno == WSAENOTSOCK) |
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183 | errno = EBADF; |
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184 | else |
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185 | errno -= WSABASEERR; |
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186 | #endif |
| 56 | |
187 | |
| 57 | for (word = vec_max; word--; ) |
188 | #ifdef _WIN32 |
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189 | /* select on windows erroneously returns EINVAL when no fd sets have been |
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190 | * provided (this is documented). what microsoft doesn't tell you that this bug |
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191 | * exists even when the fd sets _are_ provided, so we have to check for this bug |
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192 | * here and emulate by sleeping manually. |
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193 | * we also get EINVAL when the timeout is invalid, but we ignore this case here |
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194 | * and assume that EINVAL always means: you have to wait manually. |
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195 | */ |
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196 | if (errno == EINVAL) |
| 58 | { |
197 | { |
| 59 | if (((uint32_t *)vec_ro) [word] | ((uint32_t *)vec_wo) [word]) |
198 | if (timeout) |
| 60 | for (offs = 4; offs--; ) |
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| 61 | { |
199 | { |
| 62 | int idx = word * 4 + offs; |
200 | unsigned long ms = timeout * 1e3; |
| 63 | unsigned char byte_r = vec_ro [idx]; |
201 | Sleep (ms ? ms : 1); |
| 64 | unsigned char byte_w = vec_wo [idx]; |
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| 65 | int bit; |
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| 66 | |
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| 67 | if (byte_r | byte_w) |
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| 68 | for (bit = 8; bit--; ) |
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| 69 | { |
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| 70 | int events = 0; |
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| 71 | events |= byte_r & (1 << bit) ? EV_READ : 0; |
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| 72 | events |= byte_w & (1 << bit) ? EV_WRITE : 0; |
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| 73 | |
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| 74 | if (events) |
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| 75 | fd_event (idx * 8 + bit, events); |
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| 76 | } |
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| 77 | } |
202 | } |
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203 | |
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204 | return; |
| 78 | } |
205 | } |
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206 | #endif |
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207 | |
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208 | if (errno == EBADF) |
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209 | fd_ebadf (EV_A); |
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210 | else if (errno == ENOMEM && !syserr_cb) |
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211 | fd_enomem (EV_A); |
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212 | else if (errno != EINTR) |
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213 | ev_syserr ("(libev) select"); |
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214 | |
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215 | return; |
| 79 | } |
216 | } |
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217 | |
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218 | #if EV_SELECT_USE_FD_SET |
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219 | |
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220 | { |
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221 | int fd; |
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222 | |
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223 | for (fd = 0; fd < anfdmax; ++fd) |
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224 | if (anfds [fd].events) |
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225 | { |
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226 | int events = 0; |
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227 | #if EV_SELECT_IS_WINSOCKET |
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228 | SOCKET handle = anfds [fd].handle; |
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229 | #else |
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230 | int handle = fd; |
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231 | #endif |
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232 | |
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233 | if (FD_ISSET (handle, (fd_set *)vec_ro)) events |= EV_READ; |
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234 | if (FD_ISSET (handle, (fd_set *)vec_wo)) events |= EV_WRITE; |
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235 | #ifdef _WIN32 |
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236 | if (FD_ISSET (handle, (fd_set *)vec_eo)) events |= EV_WRITE; |
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237 | #endif |
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238 | |
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239 | if (expect_true (events)) |
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240 | fd_event (EV_A_ fd, events); |
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241 | } |
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242 | } |
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243 | |
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244 | #else |
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245 | |
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246 | { |
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247 | int word, bit; |
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248 | for (word = vec_max; word--; ) |
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249 | { |
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250 | fd_mask word_r = ((fd_mask *)vec_ro) [word]; |
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251 | fd_mask word_w = ((fd_mask *)vec_wo) [word]; |
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252 | #ifdef _WIN32 |
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253 | word_w |= ((fd_mask *)vec_eo) [word]; |
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254 | #endif |
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255 | |
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256 | if (word_r || word_w) |
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257 | for (bit = NFDBITS; bit--; ) |
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258 | { |
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259 | fd_mask mask = 1UL << bit; |
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260 | int events = 0; |
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261 | |
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262 | events |= word_r & mask ? EV_READ : 0; |
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263 | events |= word_w & mask ? EV_WRITE : 0; |
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264 | |
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265 | if (expect_true (events)) |
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266 | fd_event (EV_A_ word * NFDBITS + bit, events); |
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267 | } |
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268 | } |
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269 | } |
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270 | |
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271 | #endif |
| 80 | } |
272 | } |
| 81 | |
273 | |
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274 | int inline_size |
| 82 | void select_init (int flags) |
275 | select_init (EV_P_ int flags) |
| 83 | { |
276 | { |
| 84 | ev_method = EVMETHOD_SELECT; |
277 | backend_fudge = 1e-6; |
| 85 | method_fudge = 1e-2; /* needed to compensate for select returning early, very conservative */ |
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| 86 | method_modify = select_modify; |
278 | backend_modify = select_modify; |
| 87 | method_poll = select_poll; |
279 | backend_poll = select_poll; |
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280 | |
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281 | #if EV_SELECT_USE_FD_SET |
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282 | vec_ri = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_ri); |
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283 | vec_ro = ev_malloc (sizeof (fd_set)); |
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284 | vec_wi = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_wi); |
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285 | vec_wo = ev_malloc (sizeof (fd_set)); |
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286 | #ifdef _WIN32 |
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287 | vec_eo = ev_malloc (sizeof (fd_set)); |
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288 | #endif |
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289 | #else |
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290 | vec_max = 0; |
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291 | vec_ri = 0; |
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292 | vec_ro = 0; |
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293 | vec_wi = 0; |
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294 | vec_wo = 0; |
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295 | #ifdef _WIN32 |
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296 | vec_eo = 0; |
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297 | #endif |
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298 | #endif |
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299 | |
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300 | return EVBACKEND_SELECT; |
| 88 | } |
301 | } |
| 89 | |
302 | |
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303 | void inline_size |
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304 | select_destroy (EV_P) |
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305 | { |
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306 | ev_free (vec_ri); |
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307 | ev_free (vec_ro); |
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308 | ev_free (vec_wi); |
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309 | ev_free (vec_wo); |
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310 | #ifdef _WIN32 |
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311 | ev_free (vec_eo); |
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312 | #endif |
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313 | } |
| 90 | |
314 | |
