I responded:
If it doesn't, this should be specified.
I've done that (see below).
And then it'd be nice to give an example where it does use edge-triggering as
well.
This would serve to make the example longer, but I'm not sure that it
would provide any real learning benefit. (I'm open to (good)
arguments to the contrary, especially if accompanied by a suitable
patch.)
The code has been altered to that shown below, which will be in
man-pages-3.13, and is already available via git.
But forgot to include the revised code. Here it is.
Cheers,
Michael
#define MAX_EVENTS 10
struct epoll_event ev, events[MAX_EVENTS];
int listen_sock, conn_sock, nfds, epollfd;
/* Set up listening socket, 'listen_sock' (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(epollfd, events, MAX_EVENTS, -1);
for (n = 0; n < nfds; ++n) {
if (events[n].data.fd == listen_sock) {
conn_sock = accept(listen_sock,
(struct sockaddr *) &local, &addrlen);
if (conn_sock == -1) {
perror("accept");
continue;
}
setnonblocking(conn_sock);
ev.events = EPOLLIN | EPOLLET;
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);
}
}
}
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