| 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 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 | */ |
| 5 | |
31 | |
| 6 | /* for unix systems */ |
32 | /* for unix systems */ |
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33 | #if WIN32 |
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34 | typedef unsigned int uint32_t; |
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35 | # ifndef EV_SELECT_USE_FD_SET |
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36 | # define EV_SELECT_USE_FD_SET 1 |
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37 | # endif |
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38 | #else |
| 7 | #include <sys/select.h> |
39 | # include <sys/select.h> |
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40 | # include <inttypes.h> |
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41 | #endif |
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42 | |
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43 | #if EV_SELECT_USE_WIN32_HANDLES |
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44 | # undef EV_SELECT_USE_FD_SET |
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45 | # define EV_SELECT_USE_FD_SET 1 |
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46 | #else |
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47 | #endif |
| 8 | |
48 | |
| 9 | #include <string.h> |
49 | #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 | |
50 | |
| 15 | static void |
51 | static void |
| 16 | select_modify (int fd, int oev, int nev) |
52 | select_modify (EV_P_ int fd, int oev, int nev) |
| 17 | { |
53 | { |
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54 | if (oev == nev) |
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55 | return; |
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56 | |
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57 | #if EV_SELECT_USE_FD_SET |
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58 | # if EV_SELECT_USE_WIN32_HANDLES |
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59 | fd = _get_osfhandle (fd); |
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60 | if (fd < 0) |
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61 | return; |
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62 | # endif |
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63 | |
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64 | if (nev & EV_READ) |
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65 | FD_SET (fd, (struct fd_set *)vec_ri); |
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66 | else |
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67 | FD_CLR (fd, (struct fd_set *)vec_ri); |
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68 | |
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69 | if (nev & EV_WRITE) |
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70 | FD_SET (fd, (struct fd_set *)vec_wi); |
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71 | else |
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72 | FD_CLR (fd, (struct fd_set *)vec_wi); |
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73 | #else |
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74 | { |
| 18 | int offs = fd >> 3; |
75 | int offs = fd >> 3; |
| 19 | int mask = 1 << (fd & 7); |
76 | int mask = 1 << (fd & 7); |
| 20 | |
77 | |
| 21 | if (vec_max < (fd >> 5) + 1) |
78 | if (vec_max < (fd >> 5) + 1) |
| 22 | { |
79 | { |
| 23 | vec_max = (fd >> 5) + 1; |
80 | int new_max = (fd >> 5) + 1; |
| 24 | |
81 | |
| 25 | vec_ri = (unsigned char *)realloc (vec_ri, vec_max * 4); |
82 | vec_ri = (unsigned char *)ev_realloc (vec_ri, new_max * 4); |
| 26 | vec_ro = (unsigned char *)realloc (vec_ro, vec_max * 4); /* could free/malloc */ |
83 | vec_ro = (unsigned char *)ev_realloc (vec_ro, new_max * 4); /* could free/malloc */ |
| 27 | vec_wi = (unsigned char *)realloc (vec_wi, vec_max * 4); |
84 | vec_wi = (unsigned char *)ev_realloc (vec_wi, new_max * 4); |
| 28 | vec_wo = (unsigned char *)realloc (vec_wo, vec_max * 4); /* could free/malloc */ |
85 | vec_wo = (unsigned char *)ev_realloc (vec_wo, new_max * 4); /* could free/malloc */ |
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86 | |
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87 | for (; vec_max < new_max; ++vec_max) |
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88 | ((uint32_t *)vec_ri)[vec_max] = |
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89 | ((uint32_t *)vec_wi)[vec_max] = 0; |
| 29 | } |
90 | } |
| 30 | |
91 | |
| 31 | vec_ri [offs] |= mask; |
92 | vec_ri [offs] |= mask; |
| 32 | if (!(nev & EV_READ)) |
93 | if (!(nev & EV_READ)) |
| 33 | vec_ri [offs] &= ~mask; |
94 | vec_ri [offs] &= ~mask; |
| 34 | |
95 | |
| 35 | vec_wi [offs] |= mask; |
96 | vec_wi [offs] |= mask; |
| 36 | if (!(nev & EV_WRITE)) |
97 | if (!(nev & EV_WRITE)) |
| 37 | vec_wi [offs] &= ~mask; |
98 | vec_wi [offs] &= ~mask; |
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99 | } |
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100 | #endif |
| 38 | } |
101 | } |
| 39 | |
102 | |
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103 | static void |
| 40 | static void select_poll (ev_tstamp timeout) |
104 | select_poll (EV_P_ ev_tstamp timeout) |
| 41 | { |
105 | { |
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106 | int word, offs; |
| 42 | struct timeval tv; |
107 | struct timeval tv; |
| 43 | int res; |
108 | int res; |
| 44 | |
109 | |
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110 | #if EV_SELECT_USE_FD_SET |
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111 | memcpy (vec_ro, vec_ri, sizeof (struct fd_set)); |
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112 | memcpy (vec_wo, vec_wi, sizeof (struct fd_set)); |
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113 | #else |
| 45 | memcpy (vec_ro, vec_ri, vec_max * 4); |
114 | memcpy (vec_ro, vec_ri, vec_max * 4); |
| 46 | memcpy (vec_wo, vec_wi, vec_max * 4); |
115 | memcpy (vec_wo, vec_wi, vec_max * 4); |
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116 | #endif |
| 47 | |
117 | |
| 48 | tv.tv_sec = (long)timeout; |
118 | tv.tv_sec = (long)timeout; |
| 49 | tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6); |
119 | tv.tv_usec = (long)((timeout - (ev_tstamp)tv.tv_sec) * 1e6); |
| 50 | |
120 | |
| 51 | res = select (vec_max * 32, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); |
121 | res = select (vec_max * 32, (fd_set *)vec_ro, (fd_set *)vec_wo, 0, &tv); |
| 52 | |
122 | |
| 53 | if (res > 0) |
123 | if (res < 0) |
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124 | { |
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125 | #ifdef WIN32 |
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126 | if (errno == WSAEINTR ) errno = EINTR; |
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127 | if (errno == WSAENOTSOCK) errno = EBADF; |
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128 | #endif |
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129 | |
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130 | if (errno == EBADF) |
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131 | fd_ebadf (EV_A); |
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132 | else if (errno == ENOMEM && !syserr_cb) |
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133 | fd_enomem (EV_A); |
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134 | else if (errno != EINTR) |
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135 | syserr ("(libev) select"); |
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136 | |
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137 | return; |
| 54 | { |
138 | } |
| 55 | int word, offs; |
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| 56 | |
139 | |
| 57 | for (word = vec_max; word--; ) |
140 | #if EV_SELECT_USE_FD_SET |
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141 | # if EV_SELECT_USE_WIN32_HANDLES |
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142 | for (word = 0; word < anfdmax; ++word) |
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143 | { |
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144 | if (!anfd [word].events) |
| 58 | { |
145 | { |
| 59 | if (((uint32_t *)vec_ro) [word] | ((uint32_t *)vec_wo) [word]) |
146 | int fd = _get_osfhandle (word); |
| 60 | for (offs = 4; offs--; ) |
147 | |
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148 | if (fd >= 0) |
| 61 | { |
149 | { |
| 62 | int idx = word * 4 + offs; |
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| 63 | unsigned char byte_r = vec_ro [idx]; |
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| 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; |
150 | int events = 0; |
| 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 | |
151 | |
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152 | if (FD_ISSET (fd, (struct fd_set *)vec_ro)) events |= EV_READ; |
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153 | if (FD_ISSET (fd, (struct fd_set *)vec_wo)) events |= EV_WRITE; |
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154 | |
| 74 | if (events) |
155 | if (events) |
| 75 | fd_event (idx * 8 + bit, events); |
156 | fd_event (EV_A_ word, events); |
| 76 | } |
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| 77 | } |
157 | } |
| 78 | } |
158 | } |
| 79 | } |
159 | } |
| 80 | } |
160 | # else |
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161 | for (word = 0; word < FD_SETSIZE; ++word) |
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162 | { |
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163 | int events = 0; |
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164 | if (FD_ISSET (word, (struct fd_set *)vec_ro)) events |= EV_READ; |
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165 | if (FD_ISSET (word, (struct fd_set *)vec_wo)) events |= EV_WRITE; |
| 81 | |
166 | |
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167 | if (events) |
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168 | fd_event (EV_A_ word, events); |
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169 | } |
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170 | # endif |
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171 | #else |
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172 | for (word = vec_max; word--; ) |
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173 | { |
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174 | if (((uint32_t *)vec_ro) [word] | ((uint32_t *)vec_wo) [word]) |
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175 | for (offs = 4; offs--; ) |
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176 | { |
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177 | int idx = word * 4 + offs; |
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178 | unsigned char byte_r = vec_ro [idx]; |
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179 | unsigned char byte_w = vec_wo [idx]; |
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180 | int bit; |
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181 | |
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182 | if (byte_r | byte_w) |
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183 | for (bit = 8; bit--; ) |
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184 | { |
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185 | int events = 0; |
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186 | events |= byte_r & (1 << bit) ? EV_READ : 0; |
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187 | events |= byte_w & (1 << bit) ? EV_WRITE : 0; |
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188 | |
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189 | if (events) |
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190 | fd_event (EV_A_ idx * 8 + bit, events); |
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191 | } |
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192 | } |
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193 | } |
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194 | #endif |
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195 | } |
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196 | |
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197 | static int |
| 82 | void select_init (int flags) |
198 | select_init (EV_P_ int flags) |
| 83 | { |
199 | { |
| 84 | ev_method = EVMETHOD_SELECT; |
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| 85 | method_fudge = 1e-2; /* needed to compensate for select returning early, very conservative */ |
200 | method_fudge = 1e-2; /* needed to compensate for select returning early, very conservative */ |
| 86 | method_modify = select_modify; |
201 | method_modify = select_modify; |
| 87 | method_poll = select_poll; |
202 | method_poll = select_poll; |
| 88 | } |
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| 89 | |
203 | |
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204 | #if EV_SELECT_USE_FD_SET |
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205 | vec_max = FD_SETSIZE / 32; |
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206 | vec_ri = ev_malloc (sizeof (struct fd_set)); FD_ZERO ((struct fd_set *)vec_ri); |
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207 | vec_ro = ev_malloc (sizeof (struct fd_set)); |
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208 | vec_wi = ev_malloc (sizeof (struct fd_set)); FD_ZERO ((struct fd_set *)vec_wi); |
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209 | vec_wo = ev_malloc (sizeof (struct fd_set)); |
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210 | #else |
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211 | vec_max = 0; |
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212 | vec_ri = 0; |
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213 | vec_ri = 0; |
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214 | vec_wo = 0; |
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215 | vec_wo = 0; |
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216 | #endif |
| 90 | |
217 | |
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218 | return EVMETHOD_SELECT; |
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219 | } |
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220 | |
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221 | static void |
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222 | select_destroy (EV_P) |
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223 | { |
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224 | ev_free (vec_ri); |
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225 | ev_free (vec_ro); |
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226 | ev_free (vec_wi); |
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227 | ev_free (vec_wo); |
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228 | } |
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229 | |
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230 | |
