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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 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 |
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8 | * modification, are permitted provided that the following conditions are |
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9 | * met: |
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10 | * |
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11 | * * Redistributions of source code must retain the above copyright |
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12 | * notice, this list of conditions and the following disclaimer. |
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13 | * |
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14 | * * Redistributions in binary form must reproduce the above |
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15 | * copyright notice, this list of conditions and the following |
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16 | * disclaimer in the documentation and/or other materials provided |
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17 | * with the distribution. |
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18 | * |
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19 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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20 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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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 | */ |
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31 | |
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32 | #ifndef _WIN32 |
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33 | /* for unix systems */ |
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34 | # include <sys/select.h> |
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35 | # include <inttypes.h> |
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36 | #endif |
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37 | |
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38 | #ifndef EV_SELECT_USE_FD_SET |
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39 | # ifdef NFDBITS |
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40 | # define EV_SELECT_USE_FD_SET 0 |
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41 | # else |
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42 | # define EV_SELECT_USE_FD_SET 1 |
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43 | # endif |
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44 | #endif |
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45 | |
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46 | #if EV_SELECT_IS_WINSOCKET |
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47 | # undef EV_SELECT_USE_FD_SET |
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48 | # define EV_SELECT_USE_FD_SET 1 |
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49 | # undef EINTR |
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50 | # define EINTR WSAEINTR |
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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 |
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56 | |
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57 | #if !EV_SELECT_USE_FD_SET |
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58 | # define NFDBYTES (NFDBITS / 8) |
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59 | #endif |
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60 | |
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61 | #include <string.h> |
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62 | |
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63 | static void |
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64 | select_modify (EV_P_ int fd, int oev, int nev) |
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65 | { |
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66 | if (oev == nev) |
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67 | return; |
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68 | |
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69 | { |
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70 | #if EV_SELECT_USE_FD_SET |
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71 | |
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72 | #if EV_SELECT_IS_WINSOCKET |
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73 | SOCKET handle = anfds [fd].handle; |
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74 | #else |
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75 | int handle = fd; |
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76 | #endif |
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77 | |
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78 | if (nev & EV_READ) |
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79 | FD_SET (handle, (fd_set *)vec_ri); |
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80 | else |
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81 | FD_CLR (handle, (fd_set *)vec_ri); |
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82 | |
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83 | if (nev & EV_WRITE) |
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84 | FD_SET (handle, (fd_set *)vec_wi); |
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85 | else |
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86 | FD_CLR (handle, (fd_set *)vec_wi); |
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87 | |
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88 | #else |
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89 | |
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90 | int word = fd / NFDBITS; |
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91 | int mask = 1UL << (fd % NFDBITS); |
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92 | |
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93 | if (vec_max < word + 1) |
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94 | { |
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95 | int new_max = word + 1; |
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96 | |
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97 | vec_ri = ev_realloc (vec_ri, new_max * NFDBYTES); |
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98 | vec_ro = ev_realloc (vec_ro, new_max * NFDBYTES); /* could free/malloc */ |
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99 | vec_wi = ev_realloc (vec_wi, new_max * NFDBYTES); |
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100 | vec_wo = ev_realloc (vec_wo, new_max * NFDBYTES); /* could free/malloc */ |
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101 | |
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102 | for (; vec_max < new_max; ++vec_max) |
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103 | ((fd_mask *)vec_ri)[vec_max] = |
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104 | ((fd_mask *)vec_wi)[vec_max] = 0; |
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105 | } |
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106 | |
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107 | ((fd_mask *)vec_ri) [word] |= mask; |
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108 | if (!(nev & EV_READ)) |
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109 | ((fd_mask *)vec_ri) [word] &= ~mask; |
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110 | |
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111 | ((fd_mask *)vec_wi) [word] |= mask; |
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112 | if (!(nev & EV_WRITE)) |
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113 | ((fd_mask *)vec_wi) [word] &= ~mask; |
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114 | #endif |
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115 | } |
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116 | } |
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117 | |
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118 | static void |
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119 | select_poll (EV_P_ ev_tstamp timeout) |
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120 | { |
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121 | struct timeval tv; |
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122 | int res; |
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123 | |
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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 | |
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132 | tv.tv_sec = (long)timeout; |
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133 | tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6); |
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134 | |
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135 | res = select (vec_max * NFDBITS, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); |
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136 | |
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137 | if (res < 0) |
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138 | { |
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139 | #if EV_SELECT_IS_WINSOCKET |
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140 | errno = WSAGetLastError (); |
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141 | #endif |
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142 | |
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143 | if (errno == EBADF) |
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144 | fd_ebadf (EV_A); |
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145 | else if (errno == ENOMEM && !syserr_cb) |
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146 | fd_enomem (EV_A); |
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147 | else if (errno != EINTR) |
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148 | syserr ("(libev) select"); |
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149 | |
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150 | return; |
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151 | } |
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152 | |
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153 | #if EV_SELECT_USE_FD_SET |
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154 | |
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155 | { |
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156 | int fd; |
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157 | |
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158 | for (fd = 0; fd < anfdmax; ++fd) |
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159 | if (anfds [fd].events) |
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160 | { |
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161 | int events = 0; |
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162 | #if EV_SELECT_IS_WINSOCKET |
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163 | SOCKET handle = anfds [fd].handle; |
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164 | #else |
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165 | int handle = fd; |
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166 | #endif |
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167 | |
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168 | if (FD_ISSET (handle, (fd_set *)vec_ro)) events |= EV_READ; |
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169 | if (FD_ISSET (handle, (fd_set *)vec_wo)) events |= EV_WRITE; |
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170 | |
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171 | if (events) |
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172 | fd_event (EV_A_ fd, events); |
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173 | } |
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174 | } |
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175 | |
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176 | #else |
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177 | |
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178 | { |
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179 | int word, bit; |
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180 | for (word = vec_max; word--; ) |
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181 | { |
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182 | fd_mask word_r = ((fd_mask *)vec_ro) [word]; |
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183 | fd_mask word_w = ((fd_mask *)vec_wo) [word]; |
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184 | |
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185 | if (word_r || word_w) |
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186 | for (bit = NFDBITS; bit--; ) |
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187 | { |
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188 | fd_mask mask = 1UL << bit; |
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189 | int events = 0; |
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190 | |
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191 | events |= word_r & mask ? EV_READ : 0; |
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192 | events |= word_w & mask ? EV_WRITE : 0; |
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193 | |
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194 | if (events) |
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195 | fd_event (EV_A_ word * NFDBITS + bit, events); |
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196 | } |
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197 | } |
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198 | } |
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199 | |
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200 | #endif |
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201 | } |
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202 | |
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203 | int inline_size |
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204 | select_init (EV_P_ int flags) |
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205 | { |
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206 | backend_fudge = 1e-2; /* needed to compensate for select returning early, very conservative */ |
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207 | backend_modify = select_modify; |
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208 | backend_poll = select_poll; |
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209 | |
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210 | #if EV_SELECT_USE_FD_SET |
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211 | vec_max = FD_SETSIZE / 32; |
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212 | vec_ri = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_ri); |
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213 | vec_ro = ev_malloc (sizeof (fd_set)); |
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214 | vec_wi = ev_malloc (sizeof (fd_set)); FD_ZERO ((fd_set *)vec_wi); |
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215 | vec_wo = ev_malloc (sizeof (fd_set)); |
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216 | #else |
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217 | vec_max = 0; |
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218 | vec_ri = 0; |
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219 | vec_ri = 0; |
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220 | vec_wo = 0; |
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221 | vec_wo = 0; |
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222 | #endif |
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223 | |
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224 | return EVBACKEND_SELECT; |
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225 | } |
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226 | |
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227 | void inline_size |
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228 | select_destroy (EV_P) |
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229 | { |
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230 | ev_free (vec_ri); |
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231 | ev_free (vec_ro); |
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232 | ev_free (vec_wi); |
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233 | ev_free (vec_wo); |
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234 | } |
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235 | |
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236 | |