Re: Some simple c++ network library?
@2 and 4, how did you even discover this information? I doubt Philip ever told us what network library he used. I guarantee you he used winsock.
@Rastislav Kiss, you can make an echo server using C using POSIX. Problem in this is that it only works on POSIX-based systems. Either way it looks like this:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <unistd.h>
#include <sys/wait.h>
#include <signal.h>
#define MAX_ENQUEUED 20
#define BUF_LEN 256
#define PORT_STR "12321"
/* ------------------------------------------------------------ */
/* How to clean up after dead child processes */
/* ------------------------------------------------------------ */
void wait_for_zombie(int s)
{
while(waitpid(-1, NULL, WNOHANG) > 0) ;
}
/* ------------------------------------------------------------ */
/* Core of implementation of a child process */
/* ------------------------------------------------------------ */
void echo_lines(int csock)
{
char buf[BUF_LEN];
int r;
while( (r = read(csock, buf, BUF_LEN)) > 0 ) {
(void)write(csock, buf, r);
}
exit(EXIT_SUCCESS);
}
/* ------------------------------------------------------------ */
/* Core of implementation of the parent process */
/* ------------------------------------------------------------ */
void take_connections_forever(int ssock)
{
for(;;) {
struct sockaddr addr;
socklen_t addr_size = sizeof(addr);
int csock;
/* Block until we take one connection to the server socket */
csock = accept(ssock, &addr, &addr_size);
/* If it was a successful connection, spawn a worker process to service it */
if ( csock == -1 ) {
perror("accept");
} else if ( fork() == 0 ) {
close(ssock);
echo_lines(csock);
} else {
close(csock);
}
}
}
/* ------------------------------------------------------------ */
/* The server process's one-off setup code */
/* ------------------------------------------------------------ */
int main()
{
struct addrinfo hints, *res;
struct sigaction sa;
int sock;
/* Look up the address to bind to */
memset(&hints, 0, sizeof(struct addrinfo));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_PASSIVE;
if ( getaddrinfo(NULL, PORT_STR, &hints, &res) != 0 ) {
perror("getaddrinfo");
exit(EXIT_FAILURE);
}
/* Make a socket */
if ( (sock = socket(res->ai_family, res->ai_socktype, res->ai_protocol)) == -1 ) {
perror("socket");
exit(EXIT_FAILURE);
}
/* Arrange to clean up child processes (the workers) */
sa.sa_handler = wait_for_zombie;
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_RESTART;
if ( sigaction(SIGCHLD, &sa, NULL) == -1 ) {
perror("sigaction");
exit(EXIT_FAILURE);
}
/* Associate the socket with its address */
if ( bind(sock, res->ai_addr, res->ai_addrlen) != 0 ) {
perror("bind");
exit(EXIT_FAILURE);
}
freeaddrinfo(res);
/* State that we've opened a server socket and are listening for connections */
if ( listen(sock, MAX_ENQUEUED) != 0 ) {
perror("listen");
exit(EXIT_FAILURE);
}
/* Serve the listening socket until killed */
take_connections_forever(sock);
return EXIT_SUCCESS;
}Or you can use sockets with Boost.Asio:
//compile with g++ main.cpp -lboost_system -pthread
#include <boost/asio.hpp>
int main()
{
boost::asio::io_service io_service;
boost::asio::ip::tcp::socket sock(io_service);
boost::asio::ip::tcp::resolver resolver(io_service);
boost::asio::ip::tcp::resolver::query query("localhost", "4321");
boost::asio::connect(sock, resolver.resolve(query));
boost::asio::write(sock, boost::asio::buffer("Hello world socket\r\n"));
return 0;
}or even:
//compile with g++ main.cpp -lboost_system -pthread
#include <boost/asio.hpp>
using namespace boost::asio;
int main()
{
io_service io_service;
ip::tcp::socket sock(io_service);
ip::tcp::resolver resolver(io_service);
ip::tcp::resolver::query query("localhost", "4321");
connect(sock, resolver.resolve(query));
write(sock, buffer("Hello world socket\r\n"));
return 0;
}There are many other ways to do this. (I got this material from http://rosettacode.org/wiki/Echo_server and http://rosettacode.org/wiki/Sockets); go to http://rosettacode.org/wiki/Category:C++ for other ideas.
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