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Comparing libev/ev_epoll.c (file contents):
Revision 1.2 by root, Tue Oct 30 23:54:38 2007 UTC vs.
Revision 1.9 by root, Thu Nov 1 13:11:12 2007 UTC

1/*
2 * libev epoll fd activity backend
3 *
4 * Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are
9 * met:
10 *
11 * * Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 *
14 * * Redistributions in binary form must reproduce the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer in the documentation and/or other materials provided
17 * with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
1#include <sys/epoll.h> 32#include <sys/epoll.h>
2 33
3static int epoll_fd = -1; 34static int epoll_fd = -1;
4 35
5static void 36static void
… …
11 ev.data.fd = fd; 42 ev.data.fd = fd;
12 ev.events = 43 ev.events =
13 (nev & EV_READ ? EPOLLIN : 0) 44 (nev & EV_READ ? EPOLLIN : 0)
14 | (nev & EV_WRITE ? EPOLLOUT : 0); 45 | (nev & EV_WRITE ? EPOLLOUT : 0);
15 46
16 fprintf (stderr, "reify %d,%d,%d m%d (r=%d)\n", fd, oev, nev, mode,//D
17 epoll_ctl (epoll_fd, mode, fd, &ev) 47 epoll_ctl (epoll_fd, mode, fd, &ev);
18 );//D
19} 48}
20 49
50static void
21void epoll_postfork_child (void) 51epoll_postfork_child (void)
22{ 52{
23 int fd; 53 int fd;
24 54
25 epoll_fd = epoll_create (256); 55 epoll_fd = epoll_create (256);
56 fcntl (epoll_fd, F_SETFD, FD_CLOEXEC);
26 57
27 /* re-register interest in fds */ 58 /* re-register interest in fds */
28 for (fd = 0; fd < anfdmax; ++fd) 59 for (fd = 0; fd < anfdmax; ++fd)
29 if (anfds [fd].wev) 60 if (anfds [fd].events)//D
30 epoll_modify (fd, EV_NONE, anfds [fd].wev); 61 epoll_modify (fd, EV_NONE, anfds [fd].events);
31} 62}
32 63
33static struct epoll_event *events; 64static struct epoll_event *events;
34static int eventmax; 65static int eventmax;
35 66
67static void
36static void epoll_poll (ev_tstamp timeout) 68epoll_poll (ev_tstamp timeout)
37{ 69{
38 int eventcnt = epoll_wait (epoll_fd, events, eventmax, ceil (timeout * 1000.)); 70 int eventcnt = epoll_wait (epoll_fd, events, eventmax, ceil (timeout * 1000.));
39 int i; 71 int i;
40 72
41 if (eventcnt < 0) 73 if (eventcnt < 0)
… …
55 eventmax += eventmax >> 1; 87 eventmax += eventmax >> 1;
56 events = malloc (sizeof (struct epoll_event) * eventmax); 88 events = malloc (sizeof (struct epoll_event) * eventmax);
57 } 89 }
58} 90}
59 91
92static void
60int epoll_init (int flags) 93epoll_init (int flags)
61{ 94{
62 epoll_fd = epoll_create (256); 95 epoll_fd = epoll_create (256);
63 96
64 if (epoll_fd < 0) 97 if (epoll_fd < 0)
65 return 0; 98 return;
66 99
100 fcntl (epoll_fd, F_SETFD, FD_CLOEXEC);
101
67 ev_method = EVMETHOD_EPOLL; 102 ev_method = EVMETHOD_EPOLL;
68 method_fudge = 1e-3; /* needed to compensate for epoll returning early */ 103 method_fudge = 1e-3; /* needed to compensate for epoll returning early */
69 method_modify = epoll_modify; 104 method_modify = epoll_modify;
70 method_poll = epoll_poll; 105 method_poll = epoll_poll;
71 106
72 eventmax = 64; /* intiial number of events receivable per poll */ 107 eventmax = 64; /* intiial number of events receivable per poll */
73 events = malloc (sizeof (struct epoll_event) * eventmax); 108 events = malloc (sizeof (struct epoll_event) * eventmax);
109}
74 110
75 return 1;
76}

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