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1 | /* |
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2 | * libev select fd activity backend |
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3 | * |
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4 | * Copyright (c) 2007,2008 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 | */ |
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39 | |
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40 | #ifndef _WIN32 |
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41 | /* for unix systems */ |
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42 | # include <sys/select.h> |
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43 | # include <inttypes.h> |
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44 | #endif |
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45 | |
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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 |
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50 | # define EV_SELECT_USE_FD_SET 1 |
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51 | # endif |
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52 | #endif |
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53 | |
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54 | #if EV_SELECT_IS_WINSOCKET |
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55 | # undef EV_SELECT_USE_FD_SET |
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56 | # define EV_SELECT_USE_FD_SET 1 |
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57 | #endif |
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58 | |
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59 | #if !EV_SELECT_USE_FD_SET |
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60 | # define NFDBYTES (NFDBITS / 8) |
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61 | #endif |
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62 | |
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63 | #include <string.h> |
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64 | |
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65 | static void |
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66 | select_modify (EV_P_ int fd, int oev, int nev) |
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67 | { |
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68 | if (oev == nev) |
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69 | return; |
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70 | |
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71 | { |
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72 | #if EV_SELECT_USE_FD_SET |
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73 | |
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74 | #if EV_SELECT_IS_WINSOCKET |
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75 | SOCKET handle = anfds [fd].handle; |
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76 | #else |
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77 | int handle = fd; |
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78 | #endif |
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79 | |
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80 | if (nev & EV_READ) |
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81 | FD_SET (handle, (fd_set *)vec_ri); |
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82 | else |
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83 | FD_CLR (handle, (fd_set *)vec_ri); |
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84 | |
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85 | if (nev & EV_WRITE) |
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86 | FD_SET (handle, (fd_set *)vec_wi); |
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87 | else |
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88 | FD_CLR (handle, (fd_set *)vec_wi); |
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89 | |
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90 | #else |
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91 | |
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92 | int word = fd / NFDBITS; |
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93 | fd_mask mask = 1UL << (fd % NFDBITS); |
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94 | |
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95 | if (expect_false (vec_max <= word)) |
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96 | { |
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97 | int new_max = word + 1; |
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98 | |
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99 | vec_ri = ev_realloc (vec_ri, new_max * NFDBYTES); |
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100 | vec_ro = ev_realloc (vec_ro, new_max * NFDBYTES); /* could free/malloc */ |
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101 | vec_wi = ev_realloc (vec_wi, new_max * NFDBYTES); |
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102 | vec_wo = ev_realloc (vec_wo, new_max * NFDBYTES); /* could free/malloc */ |
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103 | #ifdef _WIN32 |
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104 | vec_eo = ev_realloc (vec_eo, new_max * NFDBYTES); /* could free/malloc */ |
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105 | #endif |
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106 | |
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107 | for (; vec_max < new_max; ++vec_max) |
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108 | ((fd_mask *)vec_ri) [vec_max] = |
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109 | ((fd_mask *)vec_wi) [vec_max] = 0; |
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110 | } |
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111 | |
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112 | ((fd_mask *)vec_ri) [word] |= mask; |
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113 | if (!(nev & EV_READ)) |
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114 | ((fd_mask *)vec_ri) [word] &= ~mask; |
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115 | |
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116 | ((fd_mask *)vec_wi) [word] |= mask; |
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117 | if (!(nev & EV_WRITE)) |
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118 | ((fd_mask *)vec_wi) [word] &= ~mask; |
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119 | #endif |
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120 | } |
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121 | } |
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122 | |
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123 | static void |
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124 | select_poll (EV_P_ ev_tstamp timeout) |
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125 | { |
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126 | struct timeval tv; |
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127 | int res; |
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128 | int fd_setsize; |
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129 | |
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130 | tv.tv_sec = (long)timeout; |
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131 | tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6); |
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132 | |
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133 | #if EV_SELECT_USE_FD_SET |
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134 | fd_setsize = sizeof (fd_set); |
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135 | #else |
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136 | fd_setsize = vec_max * NFDBYTES; |
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137 | #endif |
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138 | |
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139 | memcpy (vec_ro, vec_ri, fd_setsize); |
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140 | memcpy (vec_wo, vec_wi, fd_setsize); |
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141 | |
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142 | #ifdef _WIN32 |
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143 | /* pass in the write set as except set. |
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144 | * the idea behind this is to work around a windows bug that causes |
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145 | * errors to be reported as an exception and not by setting |
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146 | * the writable bit. this is so uncontrollably lame. |
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147 | */ |
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148 | memcpy (vec_eo, vec_wi, fd_setsize); |
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149 | res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, (fd_set *)vec_eo, &tv); |
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150 | #else |
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151 | res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); |
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152 | #endif |
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153 | |
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154 | if (expect_false (res < 0)) |
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155 | { |
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156 | #if EV_SELECT_IS_WINSOCKET |
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157 | errno = WSAGetLastError (); |
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158 | #endif |
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159 | #ifdef WSABASEERR |
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160 | /* on windows, select returns incompatible error codes, fix this */ |
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161 | if (errno >= WSABASEERR && errno < WSABASEERR + 1000) |
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162 | if (errno == WSAENOTSOCK) |
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163 | errno = EBADF; |
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164 | else |
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165 | errno -= WSABASEERR; |
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166 | #endif |
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167 | |
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168 | #ifdef _WIN32 |
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169 | /* select on windows errornously returns EINVAL when no fd sets have been |
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170 | * provided (this is documented). what microsoft doesn't tell you that this bug |
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171 | * exists even when the fd sets are provided, so we have to check for this bug |
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172 | * here and emulate by sleeping manually. |
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173 | * we also get EINVAL when the timeout is invalid, but we ignore this case here |
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174 | * and assume that EINVAL always means: you have to wait manually. |
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175 | */ |
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176 | if (errno == EINVAL) |
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177 | { |
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178 | ev_sleep (timeout); |
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179 | return; |
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180 | } |
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181 | #endif |
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182 | |
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183 | if (errno == EBADF) |
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184 | fd_ebadf (EV_A); |
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185 | else if (errno == ENOMEM && !syserr_cb) |
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186 | fd_enomem (EV_A); |
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187 | else if (errno != EINTR) |
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188 | syserr ("(libev) select"); |
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189 | |
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190 | return; |
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191 | } |
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192 | |
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193 | #if EV_SELECT_USE_FD_SET |
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194 | |
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195 | { |
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196 | int fd; |
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197 | |
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198 | for (fd = 0; fd < anfdmax; ++fd) |
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199 | if (anfds [fd].events) |
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200 | { |
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201 | int events = 0; |
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202 | #if EV_SELECT_IS_WINSOCKET |
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203 | SOCKET handle = anfds [fd].handle; |
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204 | #else |
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205 | int handle = fd; |
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206 | #endif |
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207 | |
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208 | if (FD_ISSET (handle, (fd_set *)vec_ro)) events |= EV_READ; |
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209 | if (FD_ISSET (handle, (fd_set *)vec_wo)) events |= EV_WRITE; |
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210 | #ifdef _WIN32 |
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211 | if (FD_ISSET (handle, (fd_set *)vec_eo)) events |= EV_WRITE; |
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212 | #endif |
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213 | |
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214 | if (expect_true (events)) |
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215 | fd_event (EV_A_ fd, events); |
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216 | } |
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217 | } |
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218 | |
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219 | #else |
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220 | |
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221 | { |
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222 | int word, bit; |
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223 | for (word = vec_max; word--; ) |
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224 | { |
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225 | fd_mask word_r = ((fd_mask *)vec_ro) [word]; |
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226 | fd_mask word_w = ((fd_mask *)vec_wo) [word]; |
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227 | #ifdef _WIN32 |
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228 | word_w |= ((fd_mask *)vec_eo) [word]; |
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229 | #endif |
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230 | |
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231 | if (word_r || word_w) |
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232 | for (bit = NFDBITS; bit--; ) |
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233 | { |
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234 | fd_mask mask = 1UL << bit; |
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235 | int events = 0; |
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236 | |
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237 | events |= word_r & mask ? EV_READ : 0; |
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238 | events |= word_w & mask ? EV_WRITE : 0; |
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239 | |
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240 | if (expect_true (events)) |
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241 | fd_event (EV_A_ word * NFDBITS + bit, events); |
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242 | } |
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243 | } |
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244 | } |
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245 | |
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246 | #endif |
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247 | } |
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248 | |
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249 | int inline_size |
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250 | select_init (EV_P_ int flags) |
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251 | { |
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252 | backend_fudge = 0.; /* posix says this is zero */ |
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253 | backend_modify = select_modify; |
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254 | backend_poll = select_poll; |
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255 | |
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256 | #if EV_SELECT_USE_FD_SET |
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257 | vec_max = FD_SETSIZE / 32; |
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258 | vec_ri = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_ri); |
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259 | vec_ro = ev_malloc (sizeof (fd_set)); |
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260 | vec_wi = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_wi); |
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261 | vec_wo = ev_malloc (sizeof (fd_set)); |
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262 | #ifdef _WIN32 |
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263 | vec_eo = ev_malloc (sizeof (fd_set)); |
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264 | #endif |
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265 | #else |
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266 | vec_max = 0; |
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267 | vec_ri = 0; |
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268 | vec_ri = 0; |
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269 | vec_wo = 0; |
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270 | vec_wo = 0; |
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271 | #endif |
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272 | |
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273 | return EVBACKEND_SELECT; |
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274 | } |
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275 | |
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276 | void inline_size |
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277 | select_destroy (EV_P) |
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278 | { |
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279 | ev_free (vec_ri); |
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280 | ev_free (vec_ro); |
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281 | ev_free (vec_wi); |
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282 | ev_free (vec_wo); |
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283 | } |
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284 | |
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285 | |
