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/* udpreceive.c
* copyright (c) 2010 IOhannes m zmölnig, IEM
* copyright (c) 2006-2010 Martin Peach
* copyright (c) Miller Puckette
*/
/* */
/* A server for unidirectional communication from within Pd. */
/* */
/* This program is free software; you can redistribute it and/or */
/* modify it under the terms of the GNU General Public License */
/* as published by the Free Software Foundation; either version 2 */
/* of the License, or (at your option) any later version. */
/* */
/* This program is distributed in the hope that it will be useful, */
/* 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. */
/* */
/* You should have received a copy of the GNU General Public License */
/* along with this program; if not, write to the Free Software */
/* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/* */
static const char objName[] = "udpreceive";
#include "iemnet.h"
/* ----------------------------- udpreceive ------------------------- */
static t_class *udpreceive_class;
typedef struct _udpreceive
{
t_object x_obj;
t_outlet *x_msgout;
t_outlet *x_addrout;
t_outlet *x_statout;
int x_connectsocket;
int x_port;
t_iemnet_receiver*x_receiver;
} t_udpreceive;
static void udpreceive_read_callback(void*y,
t_iemnet_chunk*c,
int argc, t_atom*argv) {
t_udpreceive*x=(t_udpreceive*)y;
if(argc) {
iemnet__addrout(x->x_statout, x->x_addrout, c->addr, c->port);
outlet_list(x->x_msgout, gensym("list"), argc, argv);
} else {
post("[%s] nothing received", objName);
}
}
static void udpreceive_port(t_udpreceive*x, t_floatarg fportno)
{
static t_atom ap[1];
int portno = fportno;
struct sockaddr_in server;
socklen_t serversize=sizeof(server);
int sockfd = x->x_connectsocket;
int intarg;
SETFLOAT(ap, -1);
if(x->x_port == portno) {
return;
}
/* cleanup any open ports */
if(sockfd>=0) {
iemnet__receiver_destroy(x->x_receiver);
x->x_connectsocket=-1;
x->x_port=-1;
}
sockfd = socket(AF_INET, SOCK_DGRAM, 0);
if(sockfd<0) {
error("[%s]: unable to create socket", objName);
return;
}
/* ask OS to allow another Pd to reopen this port after we close it. */
intarg = 1;
if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,
(char *)&intarg, sizeof(intarg))
< 0)
error("[%s]: setsockopt (SO_REUSEADDR) failed", objName);
server.sin_family = AF_INET;
server.sin_addr.s_addr = INADDR_ANY;
server.sin_port = htons((u_short)portno);
/* name the socket */
if (bind(sockfd, (struct sockaddr *)&server, serversize) < 0)
{
sys_sockerror("[udpreceive] bind failed");
sys_closesocket(sockfd);
sockfd = -1;
outlet_anything(x->x_statout, gensym("port"), 1, ap);
return;
}
x->x_connectsocket = sockfd;
x->x_port = portno;
// find out which port is actually used (useful when assigning "0")
if(!getsockname(sockfd, (struct sockaddr *)&server, &serversize)) {
x->x_port=ntohs(server.sin_port);
}
x->x_receiver=iemnet__receiver_create(sockfd,
x,
udpreceive_read_callback);
SETFLOAT(ap, x->x_port);
outlet_anything(x->x_statout, gensym("port"), 1, ap);
}
static void *udpreceive_new(t_floatarg fportno)
{
t_udpreceive*x = (t_udpreceive *)pd_new(udpreceive_class);
x->x_msgout = outlet_new(&x->x_obj, 0);
x->x_addrout = outlet_new(&x->x_obj, gensym("list"));
x->x_statout = outlet_new(&x->x_obj, 0);
x->x_connectsocket = -1;
x->x_port = -1;
x->x_receiver = NULL;
udpreceive_port(x, fportno);
return (x);
}
static void udpreceive_free(t_udpreceive *x)
{
iemnet__receiver_destroy(x->x_receiver);
x->x_connectsocket=0;
outlet_free(x->x_msgout);
outlet_free(x->x_addrout);
outlet_free(x->x_statout);
}
IEMNET_EXTERN void udpreceive_setup(void)
{
if(!iemnet__register(objName))return;
udpreceive_class = class_new(gensym(objName),
(t_newmethod)udpreceive_new, (t_method)udpreceive_free,
sizeof(t_udpreceive), 0, A_DEFFLOAT, 0);
class_addmethod(udpreceive_class, (t_method)udpreceive_port,
gensym("port"), A_DEFFLOAT, 0);
}
IEMNET_INITIALIZER(udpreceive_setup);
/* end udpreceive.c */
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