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authorroot <root>2007-11-02 15:56:19 +0000
committerroot <root>2007-11-02 15:56:19 +0000
commit6879205607d844eab17dd6c735f8e80bf1490baf (patch)
tree87251b250416a5d7a870f9545141457745794b7c /ev_poll.c
parent61de97f9771545a844c541206449ea719aa26d21 (diff)
README
Diffstat (limited to 'ev_poll.c')
-rw-r--r--ev_poll.c110
1 files changed, 110 insertions, 0 deletions
diff --git a/ev_poll.c b/ev_poll.c
new file mode 100644
index 0000000..4793212
--- /dev/null
+++ b/ev_poll.c
@@ -0,0 +1,110 @@
+/*
+ * libev epoll fd activity backend
+ *
+ * Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials provided
+ * with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/epoll.h>
+
+static int epoll_fd = -1;
+
+static void
+epoll_modify (int fd, int oev, int nev)
+{
+ int mode = nev ? oev ? EPOLL_CTL_MOD : EPOLL_CTL_ADD : EPOLL_CTL_DEL;
+
+ struct epoll_event ev;
+ ev.data.fd = fd;
+ ev.events =
+ (nev & EV_READ ? EPOLLIN : 0)
+ | (nev & EV_WRITE ? EPOLLOUT : 0);
+
+ epoll_ctl (epoll_fd, mode, fd, &ev);
+}
+
+static void
+epoll_postfork_child (void)
+{
+ int fd;
+
+ epoll_fd = epoll_create (256);
+ fcntl (epoll_fd, F_SETFD, FD_CLOEXEC);
+
+ /* re-register interest in fds */
+ for (fd = 0; fd < anfdmax; ++fd)
+ if (anfds [fd].events)//D
+ epoll_modify (fd, EV_NONE, anfds [fd].events);
+}
+
+static struct epoll_event *events;
+static int eventmax;
+
+static void
+epoll_poll (ev_tstamp timeout)
+{
+ int eventcnt = epoll_wait (epoll_fd, events, eventmax, ceil (timeout * 1000.));
+ int i;
+
+ if (eventcnt < 0)
+ return;
+
+ for (i = 0; i < eventcnt; ++i)
+ fd_event (
+ events [i].data.fd,
+ (events [i].events & (EPOLLOUT | EPOLLERR | EPOLLHUP) ? EV_WRITE : 0)
+ | (events [i].events & (EPOLLIN | EPOLLERR | EPOLLHUP) ? EV_READ : 0)
+ );
+
+ /* if the receive array was full, increase its size */
+ if (expect_false (eventcnt == eventmax))
+ {
+ free (events);
+ eventmax = array_roundsize (events, eventmax << 1);
+ events = malloc (sizeof (struct epoll_event) * eventmax);
+ }
+}
+
+static void
+epoll_init (int flags)
+{
+ epoll_fd = epoll_create (256);
+
+ if (epoll_fd < 0)
+ return;
+
+ fcntl (epoll_fd, F_SETFD, FD_CLOEXEC);
+
+ ev_method = EVMETHOD_EPOLL;
+ method_fudge = 1e-3; /* needed to compensate for epoll returning early */
+ method_modify = epoll_modify;
+ method_poll = epoll_poll;
+
+ eventmax = 64; /* intiial number of events receivable per poll */
+ events = malloc (sizeof (struct epoll_event) * eventmax);
+}
+