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epoll_server.c
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epoll_server.c
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//https://github.com/hnakamur/luajit-examples/blob/master/socket/c/epoll-server.c
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/epoll.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
static int
create_and_bind (char *port)
{
struct addrinfo hints;
struct addrinfo *result, *rp;
int s, sfd;
memset (&hints, 0, sizeof (struct addrinfo));
hints.ai_family = AF_UNSPEC; /* Return IPv4 and IPv6 choices */
hints.ai_socktype = SOCK_STREAM; /* We want a TCP socket */
hints.ai_flags = AI_PASSIVE; /* All interfaces */
s = getaddrinfo (NULL, port, &hints, &result);
if (s != 0)
{
fprintf (stderr, "getaddrinfo: %s\n", gai_strerror (s));
return -1;
}
for (rp = result; rp != NULL; rp = rp->ai_next)
{
sfd = socket (rp->ai_family, rp->ai_socktype, rp->ai_protocol);
if (sfd == -1)
continue;
s = bind (sfd, rp->ai_addr, rp->ai_addrlen);
if (s == 0)
{
/* We managed to bind successfully! */
break;
}
close (sfd);
}
if (rp == NULL)
{
fprintf (stderr, "Could not bind\n");
return -1;
}
freeaddrinfo (result);
return sfd;
}
static int
make_socket_non_blocking (int sfd)
{
int flags, s;
flags = fcntl (sfd, F_GETFL, 0);
if (flags == -1)
{
perror ("fcntl");
return -1;
}
flags |= O_NONBLOCK;
s = fcntl (sfd, F_SETFL, flags);
if (s == -1)
{
perror ("fcntl");
return -1;
}
return 0;
}
#define MAXEVENTS 64
static const char reply[] =
"HTTP/1.0 200 OK\r\n"
"Content-type: text/html\r\n"
"Connection: close\r\n"
"Content-Length: 82\r\n"
"\r\n"
"<html>\n"
"<head>\n"
"<title>performance test</title>\n"
"</head>\n"
"<body>\n"
"test\n"
"</body>\n"
"</html>"
;
int
main (int argc, char *argv[])
{
int sfd, s;
int efd;
struct epoll_event event;
struct epoll_event *events;
if (argc != 2)
{
fprintf (stderr, "Usage: %s [port]\n", argv[0]);
exit (EXIT_FAILURE);
}
sfd = create_and_bind (argv[1]);
if (sfd == -1)
abort ();
s = make_socket_non_blocking (sfd);
if (s == -1)
abort ();
s = listen (sfd, SOMAXCONN);
if (s == -1)
{
perror ("listen");
abort ();
}
efd = epoll_create1 (0);
if (efd == -1)
{
perror ("epoll_create");
abort ();
}
event.data.fd = sfd;
event.events = EPOLLIN | EPOLLET;
s = epoll_ctl (efd, EPOLL_CTL_ADD, sfd, &event);
if (s == -1)
{
perror ("epoll_ctl");
abort ();
}
/* Buffer where events are returned */
events = calloc (MAXEVENTS, sizeof event);
/* The event loop */
while (1)
{
int n, i;
n = epoll_wait (efd, events, MAXEVENTS, -1);
for (i = 0; i < n; i++)
{
if ((events[i].events & EPOLLERR) ||
(events[i].events & EPOLLHUP) ||
(!(events[i].events & EPOLLIN)))
{
/* An error has occured on this fd, or the socket is not
* ready for reading (why were we notified then?) */
fprintf (stderr, "epoll error. events=%u\n", events[i].events);
close (events[i].data.fd);
continue;
}
else if (sfd == events[i].data.fd)
{
/* We have a notification on the listening socket, which
* means one or more incoming connections. */
while (1)
{
struct sockaddr in_addr;
socklen_t in_len;
int infd;
#if 0
char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV];
#endif
in_len = sizeof in_addr;
infd = accept (sfd, &in_addr, &in_len);
if (infd == -1)
{
printf("errno=%d, EAGAIN=%d, EWOULDBLOCK=%d\n", errno, EAGAIN, EWOULDBLOCK);
if ((errno == EAGAIN) ||
(errno == EWOULDBLOCK))
{
/* We have processed all incoming
* connections. */
printf ("processed all incoming connections.\n");
break;
}
else
{
perror ("accept");
break;
}
}
#if 0
s = getnameinfo (&in_addr, in_len,
hbuf, sizeof hbuf,
sbuf, sizeof sbuf,
NI_NUMERICHOST | NI_NUMERICSERV);
if (s == 0)
{
printf("Accepted connection on descriptor %d "
"(host=%s, port=%s)\n", infd, hbuf, sbuf);
}
#endif
/* Make the incoming socket non-blocking and add it to the
* list of fds to monitor. */
s = make_socket_non_blocking (infd);
if (s == -1)
abort ();
event.data.fd = infd;
event.events = EPOLLIN | EPOLLET;
printf("set events %u, infd=%d\n", event.events, infd);
s = epoll_ctl (efd, EPOLL_CTL_ADD, infd, &event);
if (s == -1)
{
perror ("epoll_ctl");
abort ();
}
}
/* continue; */
}
else
{
/* We have data on the fd waiting to be read. Read and
* display it. We must read whatever data is available
* completely, as we are running in edge-triggered mode
* and won't get a notification again for the same
* data. */
int done = 0;
while (1)
{
ssize_t count;
char buf[512];
count = read (events[i].data.fd, buf, sizeof buf);
if (count == -1)
{
/* If errno == EAGAIN, that means we have read all
* data. So go back to the main loop. */
if (errno != EAGAIN)
{
perror ("read");
done = 1;
}
break;
}
else if (count == 0)
{
/* End of file. The remote has closed the
* connection. */
done = 1;
break;
}
/* Write the reply to connection */
s = write (events[i].data.fd, reply, sizeof(reply));
if (s == -1)
{
perror ("write");
abort ();
}
}
if (done)
{
printf ("Closed connection on descriptor %d\n",
events[i].data.fd);
/* Closing the descriptor will make epoll remove it
* from the set of descriptors which are monitored. */
close (events[i].data.fd);
}
}
}
}
free (events);
close (sfd);
return EXIT_SUCCESS;
}