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1 | /* |
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2 | * libev epoll 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 | #include <sys/epoll.h> |
32 | #include <sys/epoll.h> |
2 | |
33 | |
3 | static int epoll_fd = -1; |
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4 | |
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5 | static void |
34 | static void |
6 | epoll_modify (int fd, int oev, int nev) |
35 | epoll_modify (EV_P_ int fd, int oev, int nev) |
7 | { |
36 | { |
8 | int mode = nev ? oev ? EPOLL_CTL_MOD : EPOLL_CTL_ADD : EPOLL_CTL_DEL; |
37 | int mode = nev ? oev ? EPOLL_CTL_MOD : EPOLL_CTL_ADD : EPOLL_CTL_DEL; |
9 | |
38 | |
10 | struct epoll_event ev; |
39 | struct epoll_event ev; |
11 | ev.data.fd = fd; |
40 | ev.data.u64 = fd; /* use u64 to fully initialise the struct, for nicer strace etc. */ |
12 | ev.events = |
41 | ev.events = |
13 | (nev & EV_READ ? EPOLLIN : 0) |
42 | (nev & EV_READ ? EPOLLIN : 0) |
14 | | (nev & EV_WRITE ? EPOLLOUT : 0); |
43 | | (nev & EV_WRITE ? EPOLLOUT : 0); |
15 | |
44 | |
16 | fprintf (stderr, "reify %d,%d,%d m%d (r=%d)\n", fd, oev, nev, mode,//D |
45 | if (expect_false (epoll_ctl (backend_fd, mode, fd, &ev))) |
17 | epoll_ctl (epoll_fd, mode, fd, &ev) |
46 | if (errno != ENOENT /* on ENOENT the fd went away, so try to do the right thing */ |
18 | );//D |
47 | || (nev && epoll_ctl (backend_fd, EPOLL_CTL_ADD, fd, &ev))) |
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48 | fd_kill (EV_A_ fd); |
19 | } |
49 | } |
20 | |
50 | |
21 | void epoll_postfork_child (void) |
51 | static void |
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52 | epoll_poll (EV_P_ ev_tstamp timeout) |
22 | { |
53 | { |
23 | int fd; |
54 | int i; |
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55 | int eventcnt = epoll_wait (backend_fd, epoll_events, epoll_eventmax, (int)ceil (timeout * 1000.)); |
24 | |
56 | |
25 | epoll_fd = epoll_create (256); |
57 | if (expect_false (eventcnt < 0)) |
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58 | { |
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59 | if (errno != EINTR) |
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60 | syserr ("(libev) epoll_wait"); |
26 | |
61 | |
27 | /* re-register interest in fds */ |
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28 | for (fd = 0; fd < anfdmax; ++fd) |
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29 | if (anfds [fd].wev) |
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30 | epoll_modify (fd, EV_NONE, anfds [fd].wev); |
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31 | } |
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32 | |
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33 | static struct epoll_event *events; |
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34 | static int eventmax; |
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35 | |
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36 | static void epoll_poll (ev_tstamp timeout) |
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37 | { |
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38 | int eventcnt = epoll_wait (epoll_fd, events, eventmax, ceil (timeout * 1000.)); |
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39 | int i; |
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40 | |
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41 | if (eventcnt < 0) |
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42 | return; |
62 | return; |
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63 | } |
43 | |
64 | |
44 | for (i = 0; i < eventcnt; ++i) |
65 | for (i = 0; i < eventcnt; ++i) |
45 | fd_event ( |
66 | fd_event ( |
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67 | EV_A_ |
46 | events [i].data.fd, |
68 | epoll_events [i].data.u64, |
47 | (events [i].events & (EPOLLOUT | EPOLLERR | EPOLLHUP) ? EV_WRITE : 0) |
69 | (epoll_events [i].events & (EPOLLOUT | EPOLLERR | EPOLLHUP) ? EV_WRITE : 0) |
48 | | (events [i].events & (EPOLLIN | EPOLLERR | EPOLLHUP) ? EV_READ : 0) |
70 | | (epoll_events [i].events & (EPOLLIN | EPOLLERR | EPOLLHUP) ? EV_READ : 0) |
49 | ); |
71 | ); |
50 | |
72 | |
51 | /* if the receive array was full, increase its size */ |
73 | /* if the receive array was full, increase its size */ |
52 | if (eventcnt == eventmax) |
74 | if (expect_false (eventcnt == epoll_eventmax)) |
53 | { |
75 | { |
54 | free (events); |
76 | ev_free (epoll_events); |
55 | eventmax += eventmax >> 1; |
77 | epoll_eventmax = array_nextsize (sizeof (struct epoll_event), epoll_eventmax, epoll_eventmax + 1); |
56 | events = malloc (sizeof (struct epoll_event) * eventmax); |
78 | epoll_events = (struct epoll_event *)ev_malloc (sizeof (struct epoll_event) * epoll_eventmax); |
57 | } |
79 | } |
58 | } |
80 | } |
59 | |
81 | |
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82 | int inline_size |
60 | int epoll_init (int flags) |
83 | epoll_init (EV_P_ int flags) |
61 | { |
84 | { |
62 | epoll_fd = epoll_create (256); |
85 | backend_fd = epoll_create (256); |
63 | |
86 | |
64 | if (epoll_fd < 0) |
87 | if (backend_fd < 0) |
65 | return 0; |
88 | return 0; |
66 | |
89 | |
67 | ev_method = EVMETHOD_EPOLL; |
90 | fcntl (backend_fd, F_SETFD, FD_CLOEXEC); |
68 | method_fudge = 1e-3; /* needed to compensate for epoll returning early */ |
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69 | method_modify = epoll_modify; |
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70 | method_poll = epoll_poll; |
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71 | |
91 | |
72 | eventmax = 64; /* intiial number of events receivable per poll */ |
92 | backend_fudge = 0.; /* kernel sources seem to indicate this to be zero */ |
73 | events = malloc (sizeof (struct epoll_event) * eventmax); |
93 | backend_modify = epoll_modify; |
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94 | backend_poll = epoll_poll; |
74 | |
95 | |
75 | return 1; |
96 | epoll_eventmax = 64; /* intiial number of events receivable per poll */ |
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97 | epoll_events = (struct epoll_event *)ev_malloc (sizeof (struct epoll_event) * epoll_eventmax); |
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98 | |
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99 | return EVBACKEND_EPOLL; |
76 | } |
100 | } |
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101 | |
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102 | void inline_size |
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103 | epoll_destroy (EV_P) |
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104 | { |
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105 | ev_free (epoll_events); |
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106 | } |
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107 | |
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108 | void inline_size |
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109 | epoll_fork (EV_P) |
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110 | { |
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111 | close (backend_fd); |
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112 | |
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113 | while ((backend_fd = epoll_create (256)) < 0) |
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114 | syserr ("(libev) epoll_create"); |
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115 | |
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116 | fcntl (backend_fd, F_SETFD, FD_CLOEXEC); |
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117 | |
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118 | fd_rearm_all (EV_A); |
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119 | } |
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120 | |