mongoose/examples/udp_echo_server/echo_server.c
Alexander Alashkin 0efa8f9d3f Add UDP echo server Mongoose example
PUBLISHED_FROM=c0ea72104da23a97c81c9f671c9b91d9df2541d1
2016-04-11 09:43:08 +01:00

56 lines
1.8 KiB
C

// Copyright (c) 2016 Cesanta Software Limited
// All rights reserved
//
// This software is dual-licensed: you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 2 as
// published by the Free Software Foundation. For the terms of this
// license, see <http://www.gnu.org/licenses/>.
//
// You are free to use this software under the terms of the GNU General
// Public License, but WITHOUT ANY WARRANTY; without even the implied
// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
// See the GNU General Public License for more details.
//
// Alternatively, you can license this software under a commercial
// license, as set out in <https://www.cesanta.com/license>.
//
#include "mongoose.h"
static void ev_handler(struct mg_connection *nc, int ev, void *p) {
struct mbuf *io = &nc->recv_mbuf;
(void) p;
switch (ev) {
case MG_EV_RECV:
mg_send(nc, io->buf, io->len); // Echo message back
mbuf_remove(io, io->len); // Discard message from recv buffer
// In case of UDP, Mongoose creates new virtual connection for
// incoming messages
// We can keep it (and it will be reused for another messages from
// the same address) or we can close it (this saves some memory, but
// decreases perfomance, because it forces creation of connection
// for every incoming dgram)
nc->flags |= MG_F_SEND_AND_CLOSE;
break;
default:
break;
}
}
int main(void) {
struct mg_mgr mgr;
const char *port1 = "udp://1234", *port2 = "udp://127.0.0.1:17000";
mg_mgr_init(&mgr, NULL);
mg_bind(&mgr, port1, ev_handler);
mg_bind(&mgr, port2, ev_handler);
printf("Starting echo mgr on ports %s, %s\n", port1, port2);
for (;;) {
mg_mgr_poll(&mgr, 1000);
}
mg_mgr_free(&mgr);
return 0;
}