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epoll.7: Improve example code 

Fill in some gaps in example code (variable declarations,
adding listening socket to epoll set).
Give variables more meaningful names.
Other minor changes.

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=504202

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Reported-by: Olaf van der Spek <OlafvdSpek@gmail.com>
This commit is contained in:
Michael Kerrisk 2008-11-01 14:30:05 -05:00
parent 1c8de4731b
commit 66132b5e47
1 changed files with 31 additions and 15 deletions
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46
man7/epoll.7
View File

@ -18,7 +18,7 @@
.\"
.\" Davide Libenzi <davidel@xmailserver.org>
.\"
.TH EPOLL 7 2008-10-10 "Linux" "Linux Programmer's Manual"
.TH EPOLL 7 2008-11-01 "Linux" "Linux Programmer's Manual"
.SH NAME
epoll \- I/O event notification facility
.SH SYNOPSIS
@ -198,28 +198,44 @@ from where it stopped before.
.in +4n
.nf
struct epoll_event ev, *events;
#define MAX_EVENTS 10
struct epoll_event ev, events[MAX_EVENTS];
int listen_sock, conn_sock, nfds, epollfd;
/* Set up listening socket, \(aqlisten_sock\(aq (socket(),
bind(), listen()) */
epollfd = epoll_create(10);
if (epollfd == \-1) {
perror("epoll_create");
exit(EXIT_FAILURE);
}
ev.events = EPOLL_IN;
ev.data.fd = listen_sock;
if (epoll_ctl(epollfd, EPOLL_CTL_ADD, listen_sock, &ev) == \-1) {
perror("epoll_ctl: listen_sock");
exit(EXIT_FAILURE);
}
for (;;) {
nfds = epoll_wait(kdpfd, events, maxevents, \-1);
nfds = epoll_wait(epollfd, events, MAX_EVENTS, \-1);
for (n = 0; n < nfds; ++n) {
if (events[n].data.fd == listener) {
client = accept(listener, (struct sockaddr *) &local,
&addrlen);
if (client < 0){
if (events[n].data.fd == listen_sock) {
conn_sock = accept(listen_sock,
(struct sockaddr *) &local, &addrlen);
if (conn_sock == \-1) {
perror("accept");
continue;
}
setnonblocking(client);
setnonblocking(conn_sock);
ev.events = EPOLLIN | EPOLLET;
ev.data.fd = client;
if (epoll_ctl(kdpfd, EPOLL_CTL_ADD, client, &ev)
== \-1) {
fprintf(stderr,
"epoll set insertion error: fd=%d\\n",
client);
return \-1;
ev.data.fd = conn_sock;
if (epoll_ctl(epollfd, EPOLL_CTL_ADD, conn_sock,
&ev) == \-1) {
perror("epoll_ctl: conn_sock);
exit(EXIT_FAILURE);
}
} else {
do_use_fd(events[n].data.fd);