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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 | |
| 1 | /* for broken bsd's */ |
32 | /* for broken bsd's */ |
| 2 | #include <sys/time.h> |
33 | #include <sys/time.h> |
| 3 | #include <sys/types.h> |
34 | #include <sys/types.h> |
| 4 | #include <unistd.h> |
35 | #include <unistd.h> |
| 5 | |
36 | |
| … | |
… | |
| 18 | int offs = fd >> 3; |
49 | int offs = fd >> 3; |
| 19 | int mask = 1 << (fd & 7); |
50 | int mask = 1 << (fd & 7); |
| 20 | |
51 | |
| 21 | if (vec_max < (fd >> 5) + 1) |
52 | if (vec_max < (fd >> 5) + 1) |
| 22 | { |
53 | { |
| 23 | vec_max = (fd >> 5) + 1; |
54 | int new_max = (fd >> 5) + 1; |
| 24 | |
55 | |
| 25 | vec_ri = (unsigned char *)realloc (vec_ri, vec_max * 4); |
56 | vec_ri = (unsigned char *)realloc (vec_ri, new_max * 4); |
| 26 | vec_ro = (unsigned char *)realloc (vec_ro, vec_max * 4); /* could free/malloc */ |
57 | vec_ro = (unsigned char *)realloc (vec_ro, new_max * 4); /* could free/malloc */ |
| 27 | vec_wi = (unsigned char *)realloc (vec_wi, vec_max * 4); |
58 | vec_wi = (unsigned char *)realloc (vec_wi, new_max * 4); |
| 28 | vec_wo = (unsigned char *)realloc (vec_wo, vec_max * 4); /* could free/malloc */ |
59 | vec_wo = (unsigned char *)realloc (vec_wo, new_max * 4); /* could free/malloc */ |
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60 | |
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61 | for (; vec_max < new_max; ++vec_max) |
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62 | ((uint32_t *)vec_ri)[vec_max] = |
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63 | ((uint32_t *)vec_wi)[vec_max] = 0; |
| 29 | } |
64 | } |
| 30 | |
65 | |
| 31 | vec_ri [offs] |= mask; |
66 | vec_ri [offs] |= mask; |
| 32 | if (!(nev & EV_READ)) |
67 | if (!(nev & EV_READ)) |
| 33 | vec_ri [offs] &= ~mask; |
68 | vec_ri [offs] &= ~mask; |
| … | |
… | |
| 35 | vec_wi [offs] |= mask; |
70 | vec_wi [offs] |= mask; |
| 36 | if (!(nev & EV_WRITE)) |
71 | if (!(nev & EV_WRITE)) |
| 37 | vec_wi [offs] &= ~mask; |
72 | vec_wi [offs] &= ~mask; |
| 38 | } |
73 | } |
| 39 | |
74 | |
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75 | static void |
| 40 | static void select_poll (ev_tstamp timeout) |
76 | select_poll (ev_tstamp timeout) |
| 41 | { |
77 | { |
| 42 | struct timeval tv; |
78 | struct timeval tv; |
| 43 | int res; |
79 | int res; |
| 44 | |
80 | |
| 45 | memcpy (vec_ro, vec_ri, vec_max * 4); |
81 | memcpy (vec_ro, vec_ri, vec_max * 4); |
| … | |
… | |
| 75 | fd_event (idx * 8 + bit, events); |
111 | fd_event (idx * 8 + bit, events); |
| 76 | } |
112 | } |
| 77 | } |
113 | } |
| 78 | } |
114 | } |
| 79 | } |
115 | } |
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116 | else if (res < 0) |
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117 | { |
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118 | if (errno == EBADF) |
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119 | fd_ebadf (); |
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120 | else if (errno == ENOMEM) |
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121 | fd_enomem (); |
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122 | } |
| 80 | } |
123 | } |
| 81 | |
124 | |
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125 | static void |
| 82 | void select_init (int flags) |
126 | select_init (int flags) |
| 83 | { |
127 | { |
| 84 | ev_method = EVMETHOD_SELECT; |
128 | ev_method = EVMETHOD_SELECT; |
| 85 | method_fudge = 1e-2; /* needed to compensate for select returning early, very conservative */ |
129 | method_fudge = 1e-2; /* needed to compensate for select returning early, very conservative */ |
| 86 | method_modify = select_modify; |
130 | method_modify = select_modify; |
| 87 | method_poll = select_poll; |
131 | method_poll = select_poll; |
| 88 | } |
132 | } |
| 89 | |
133 | |
| 90 | |
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