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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 |
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17 | epoll_ctl (epoll_fd, mode, fd, &ev) |
45 | epoll_ctl (epoll_fd, mode, fd, &ev); |
18 | );//D |
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19 | } |
46 | } |
20 | |
47 | |
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48 | static void |
21 | void epoll_postfork_child (void) |
49 | epoll_postfork_child (EV_P) |
22 | { |
50 | { |
23 | int fd; |
51 | int fd; |
24 | |
52 | |
25 | epoll_fd = epoll_create (256); |
53 | epoll_fd = epoll_create (256); |
26 | fcntl (epoll_fd, F_SETFD, FD_CLOEXEC); |
54 | fcntl (epoll_fd, F_SETFD, FD_CLOEXEC); |
27 | |
55 | |
28 | /* re-register interest in fds */ |
56 | /* re-register interest in fds */ |
29 | for (fd = 0; fd < anfdmax; ++fd) |
57 | for (fd = 0; fd < anfdmax; ++fd) |
30 | if (anfds [fd].wev) |
58 | if (anfds [fd].events)//D |
31 | epoll_modify (fd, EV_NONE, anfds [fd].wev); |
59 | epoll_modify (EV_A_ fd, EV_NONE, anfds [fd].events); |
32 | } |
60 | } |
33 | |
61 | |
34 | static struct epoll_event *events; |
62 | static void |
35 | static int eventmax; |
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36 | |
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37 | static void epoll_poll (ev_tstamp timeout) |
63 | epoll_poll (EV_P_ ev_tstamp timeout) |
38 | { |
64 | { |
39 | int eventcnt = epoll_wait (epoll_fd, events, eventmax, ceil (timeout * 1000.)); |
65 | int eventcnt = epoll_wait (epoll_fd, events, eventmax, ceil (timeout * 1000.)); |
40 | int i; |
66 | int i; |
41 | |
67 | |
42 | if (eventcnt < 0) |
68 | if (eventcnt < 0) |
43 | return; |
69 | return; |
44 | |
70 | |
45 | for (i = 0; i < eventcnt; ++i) |
71 | for (i = 0; i < eventcnt; ++i) |
46 | fd_event ( |
72 | fd_event ( |
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73 | EV_A_ |
47 | events [i].data.fd, |
74 | events [i].data.u64, |
48 | (events [i].events & (EPOLLOUT | EPOLLERR | EPOLLHUP) ? EV_WRITE : 0) |
75 | (events [i].events & (EPOLLOUT | EPOLLERR | EPOLLHUP) ? EV_WRITE : 0) |
49 | | (events [i].events & (EPOLLIN | EPOLLERR | EPOLLHUP) ? EV_READ : 0) |
76 | | (events [i].events & (EPOLLIN | EPOLLERR | EPOLLHUP) ? EV_READ : 0) |
50 | ); |
77 | ); |
51 | |
78 | |
52 | /* if the receive array was full, increase its size */ |
79 | /* if the receive array was full, increase its size */ |
53 | if (eventcnt == eventmax) |
80 | if (expect_false (eventcnt == eventmax)) |
54 | { |
81 | { |
55 | free (events); |
82 | free (events); |
56 | eventmax += eventmax >> 1; |
83 | eventmax = array_roundsize (events, eventmax << 1); |
57 | events = malloc (sizeof (struct epoll_event) * eventmax); |
84 | events = malloc (sizeof (struct epoll_event) * eventmax); |
58 | } |
85 | } |
59 | } |
86 | } |
60 | |
87 | |
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88 | static int |
61 | void epoll_init (int flags) |
89 | epoll_init (EV_P_ int flags) |
62 | { |
90 | { |
63 | epoll_fd = epoll_create (256); |
91 | epoll_fd = epoll_create (256); |
64 | |
92 | |
65 | if (epoll_fd < 0) |
93 | if (epoll_fd < 0) |
66 | return; |
94 | return 0; |
67 | |
95 | |
68 | fcntl (epoll_fd, F_SETFD, FD_CLOEXEC); |
96 | fcntl (epoll_fd, F_SETFD, FD_CLOEXEC); |
69 | |
97 | |
70 | ev_method = EVMETHOD_EPOLL; |
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71 | method_fudge = 1e-3; /* needed to compensate for epoll returning early */ |
98 | method_fudge = 1e-3; /* needed to compensate for epoll returning early */ |
72 | method_modify = epoll_modify; |
99 | method_modify = epoll_modify; |
73 | method_poll = epoll_poll; |
100 | method_poll = epoll_poll; |
74 | |
101 | |
75 | eventmax = 64; /* intiial number of events receivable per poll */ |
102 | eventmax = 64; /* intiial number of events receivable per poll */ |
76 | events = malloc (sizeof (struct epoll_event) * eventmax); |
103 | events = malloc (sizeof (struct epoll_event) * eventmax); |
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104 | |
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105 | return EVMETHOD_EPOLL; |
77 | } |
106 | } |
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107 | |