2 .\" epoll by Davide Libenzi ( efficient event notification retrieval )
3 .\" Copyright (C) 2003 Davide Libenzi
5 .\" This program is free software; you can redistribute it and/or modify
6 .\" it under the terms of the GNU General Public License as published by
7 .\" the Free Software Foundation; either version 2 of the License, or
8 .\" (at your option) any later version.
10 .\" This program is distributed in the hope that it will be useful,
11 .\" but WITHOUT ANY WARRANTY; without even the implied warranty of
12 .\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 .\" GNU General Public License for more details.
15 .\" You should have received a copy of the GNU General Public License
16 .\" along with this program; if not, write to the Free Software
17 .\" Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 .\" Davide Libenzi <davidel@xmailserver.org>
21 .\" Japanese Version Copyright (c) 2004-2005 Yuichi SATO
22 .\" all rights reserved.
23 .\" Translated Sat Jun 19 07:50:04 JST 2004
24 .\" by Yuichi SATO <ysato444@yahoo.co.jp>
25 .\" Updated & Modified 2005-01-18, Yuichi SATO
26 .\" Updated 2006-07-14, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>
27 .\" Catch up to LDP v2.34. epoll.4 is renamed to epoll.7.
28 .\" Updated 2007-09-07, Akihiro MOTOKI, LDP v2.64
29 .\" Updated 2008-04-08, Akihiro MOTOKI, LDP v2.79
30 .\" Updated 2009-02-23, Akihiro MOTOKI, LDP v3.19
32 .TH EPOLL 7 2009-02-01 "Linux" "Linux Programmer's Manual"
34 epoll \- I/O ¥¤¥Ù¥ó¥ÈÄÌÃε¡Ç½
36 .B #include <sys/epoll.h>
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188 ¸Æ¤Ó½Ð¤·Â¦¤ÎÀÕǤ¤Ç¤¢¤ë¡£
189 .SS /proc ¥¤¥ó¥¿¥Õ¥§¡¼¥¹
190 epoll ¤¬¾ÃÈñ¤¹¤ë¥«¡¼¥Í¥ë¥á¥â¥ê¤ÎÎ̤òÀ©¸Â¤¹¤ë¤¿¤á¤Ë¡¢
191 °Ê²¼¤Î¥¤¥ó¥¿¥Õ¥§¡¼¥¹¤ò»ÈÍѤ¹¤ë¤³¤È¤¬¤Ç¤¤ë¡£
193 .\" Following was added in 2.6.28, but them removed in 2.6.29
195 .\" .IR /proc/sys/fs/epoll/max_user_instances " (since Linux 2.6.28)"
196 .\" This specifies an upper limit on the number of epoll instances
197 .\" that can be created per real user ID.
199 .IR /proc/sys/fs/epoll/max_user_watches " (Linux 2.6.28 °Ê¹ß)"
200 ¤³¤Î¥Õ¥¡¥¤¥ë¤Ï¡¢¤¢¤ë¥æ¡¼¥¶¤¬¥·¥¹¥Æ¥à¾å¤ÎÁ´¤Æ¤Î epoll ¥¤¥ó¥¹¥¿¥ó¥¹¤Ë
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205 64 ¥Ó¥Ã¥È¥«¡¼¥Í¥ë¤Ç¤ª¤è¤½ 160 ¥Ð¥¤¥È¤Ç¤¢¤ë¡£
206 .\" 2.6.29 (in 2.6.28, the default was 1/32 of lowmem)
209 ¤Î¥Ç¥Õ¥©¥ë¥ÈÃͤϡ¢ÍøÍѲÄǽ¤Ê¥á¥â¥ê²¼¸Â¤Î 1/25 (4%) ¤Ç¤¢¤ê¡¢
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232 ¥¤¥Ù¥ó¥È¶îÆ°¥¹¥Æ¡¼¥È¥Þ¥·¥ó¥¢¥×¥ê¥±¡¼¥·¥ç¥ó¤Ï¡¢
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237 ¸Æ¤Ó½Ð¤·¤Î¤È¤¤Ë¡¢°ÊÁ°¤ËÄä»ß¤·¤¿¤È¤³¤í¤«¤é
241 ¤ò·Ñ³¤¹¤ë¤³¤È¤¬¤Ç¤¤ë¡£
245 #define MAX_EVENTS 10
246 struct epoll_event ev, events[MAX_EVENTS];
247 int listen_sock, conn_sock, nfds, epollfd;
249 /* Set up listening socket, \(aqlisten_sock\(aq (socket(),
252 epollfd = epoll_create(10);
253 if (epollfd == \-1) {
254 perror("epoll_create");
259 ev.data.fd = listen_sock;
260 if (epoll_ctl(epollfd, EPOLL_CTL_ADD, listen_sock, &ev) == \-1) {
261 perror("epoll_ctl: listen_sock");
266 nfds = epoll_wait(epollfd, events, MAX_EVENTS, \-1);
268 perror("epoll_pwait");
272 for (n = 0; n < nfds; ++n) {
273 if (events[n].data.fd == listen_sock) {
274 conn_sock = accept(listen_sock,
275 (struct sockaddr *) &local, &addrlen);
276 if (conn_sock == \-1) {
280 setnonblocking(conn_sock);
281 ev.events = EPOLLIN | EPOLLET;
282 ev.data.fd = conn_sock;
283 if (epoll_ctl(epollfd, EPOLL_CTL_ADD, conn_sock,
285 perror("epoll_ctl: conn_sock");
289 do_use_fd(events[n].data.fd);
296 ¥¨¥Ã¥¸¥È¥ê¥¬¥¤¥ó¥¿¥Õ¥§¡¼¥¹¤È¤·¤Æ»È¤¦¾ì¹ç¡¢Àǽ¾å¤ÎÍýͳ¤Ë¤è¤ê¡¢
298 .RB ( EPOLLIN | EPOLLOUT )
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318 ²¿¤ò¥¡¼¤È¤·¤Æ»È¤¨¤Ð¤è¤¤¤«¡©
321 ¥¡¼¤Ï¥Õ¥¡¥¤¥ë¥Ç¥£¥¹¥¯¥ê¥×¥¿ÈÖ¹æ¤È¥ª¡¼¥×¥ó¥Õ¥¡¥¤¥ëµ½Ò (open file
322 description) ¤ÎÁȤǤ¢¤ë (¥ª¡¼¥×¥ó¥Õ¥¡¥¤¥ëµ½Ò¤Ï "open file handle" ¤È¤â
323 ¸Æ¤Ð¤ì¡¢¥ª¡¼¥×¥ó¤µ¤ì¤¿¥Õ¥¡¥¤¥ë¤Î¥«¡¼¥Í¥ë¤ÎÆâÉôɽ¸½¤Ç¤¢¤ë)¡£
328 ¥¤¥ó¥¹¥¿¥ó¥¹¤ËƱ¤¸¥Õ¥¡¥¤¥ë¥Ç¥£¥¹¥¯¥ê¥×¥¿¤ò 2 ²óÅÐÏ¿¤¹¤ë¤È¤É¤¦¤Ê¤ë¤«¡©
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342 .\" But a descriptor duplicated by fork(2) can't be added to the
343 .\" set, because the [file *, fd] pair is already in the epoll set.
344 .\" That is a somewhat ugly inconsistency. On the one hand, a child process
345 .\" cannot add the duplicate file descriptor to the epoll set. (In every
346 .\" other case that I can think of, descriptors duplicated by fork have
347 .\" similar semantics to descriptors duplicated by dup() and friends.) On
348 .\" the other hand, the very fact that the child has a duplicate of the
349 .\" descriptor means that even if the parent closes its descriptor, then
350 .\" epoll_wait() in the parent will continue to receive notifications for
351 .\" that descriptor because of the duplicated descriptor in the child.
353 .\" See http://thread.gmane.org/gmane.linux.kernel/596462/
354 .\" "epoll design problems with common fork/exec patterns"
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