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#define _POSIX_C_SOURCE 200112L
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <errno.h>
#include <limits.h>
#include <netdb.h>
#include <poll.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "log.h"
#ifndef OPEN_MAX
#define OPEN_MAX 1024
#endif
#define PORT "3000"
#define BUFSIZE 1024
static int
create_server(const char *port)
{
int fd, yes = 1;
struct addrinfo *res, *p, hints;
memset(&hints, 0, sizeof hints);
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_PASSIVE;
if (getaddrinfo(NULL, port, &hints, &res) != 0) {
perror("getaddrinfo");
return -1;
}
for (p = res; p != NULL; p = p->ai_next) {
if ((fd = socket(p->ai_family, p->ai_socktype, p->ai_protocol))
== -1) {
perror("socket");
continue;
}
if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &yes,
sizeof(int)) == -1) {
perror("setsockopt");
close(fd);
return -1;
}
if (ioctl(fd, FIONBIO, &yes) == -1) {
perror("ioctl");
close(fd);
return -1;
}
if (bind(fd, p->ai_addr, p->ai_addrlen) == -1) {
perror("bind");
continue;
}
break;
}
freeaddrinfo(res);
if (p == NULL) {
fprintf(stderr, "failed to bind\n");
return -1;
}
if (listen(fd, 32) == -1) {
perror("listen");
return -1;
}
logmsg(LOG_INFO, "listening on %s", port);
return fd;
}
static int
accept_connection(int s_fd)
{
int c_fd;
if ((c_fd = accept(s_fd, NULL, NULL)) == -1) {
if (errno != EWOULDBLOCK || errno != EAGAIN) {
perror("accept");
exit(1);
}
return -1;
}
logmsg(LOG_INFO, "connection accepted");
return c_fd;
}
static void
handle_client(int c_fd)
{
int n;
char buf[BUFSIZE];
n = recv(c_fd, &buf, BUFSIZE - 1, 0);
switch (n) {
case -1:
if (errno != EWOULDBLOCK || errno != EAGAIN) {
perror("recv");
}
case 0:
logmsg(LOG_INFO, "connection closed by client");
default:
buf[n] = '\0';
if (send(c_fd, buf, n, 0) == -1) {
perror("send");
}
}
close(c_fd);
}
static void
main_loop(int s_fd)
{
int i, rc, end_server = 0;
int c_fd, nfds = 1, curr_size = 0;
struct pollfd pfds[OPEN_MAX];
memset(pfds, 0, sizeof(pfds));
pfds[0].fd = s_fd;
pfds[0].events = POLLIN;
do {
rc = poll(pfds, nfds, -1);
if (rc == -1) {
perror("poll");
break;
}
if (rc == 0) {
fprintf(stderr, "poll timeout\n");
break;
}
curr_size = nfds;
for (i = 0; i < curr_size; i++) {
if (pfds[i].revents == 0)
continue;
if (pfds[i].revents != POLLIN) {
logmsg(LOG_INFO, "revents not POLLIN\n");
end_server = 1;
break;
}
if (pfds[i].fd == s_fd) {
do {
c_fd = accept_connection(s_fd);
if (c_fd != -1) {
pfds[nfds].fd = c_fd;
pfds[nfds].events = POLLIN;
nfds++;
}
} while (c_fd != -1);
} else {
handle_client(pfds[i].fd);
pfds[i].fd = -1;
}
}
} while (end_server == 0);
}
int
main()
{
int s_fd;
s_fd = create_server(PORT);
if (s_fd == -1) {
fprintf(stderr, "failed to create server\n");
exit(0);
}
main_loop(s_fd);
return 0;
}
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