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/* iemnet
*
* receiver
* receives data "chunks" from a socket
*
* copyright © 2010-2015 IOhannes m zmölnig, IEM
*/
/* 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, see */
/* http://www.gnu.org/licenses/ */
/* */
#define DEBUGLEVEL 4
#include "iemnet.h"
#include "iemnet_data.h"
#include <stdlib.h>
#include <errno.h>
#define INBUFSIZE 65536L /* was 4096: size of receiving data buffer */
struct _iemnet_receiver {
int sockfd; /* owned outside; you must call iemnet__receiver_destroy() before freeing socket yourself */
void*userdata;
t_iemnet_receivecallback callback;
};
static void pollfun(void*z, int fd)
{
// read data from socket and call callback
t_iemnet_receiver*rec=(t_iemnet_receiver*)z;
unsigned char data[INBUFSIZE];
unsigned int size=INBUFSIZE;
t_iemnet_chunk*chunk=NULL;
int result = 0;
int local_errno = 0;
struct sockaddr_in from;
socklen_t fromlen = sizeof(from);
int recv_flags=0;
#ifdef MSG_DONTWAIT
recv_flags|=MSG_DONTWAIT;
#endif
errno=0;
result = recvfrom(rec->sockfd, data, size, recv_flags,
(struct sockaddr *)&from, &fromlen);
local_errno=errno;
//fprintf(stderr, "read %d bytes...\n", result);
DEBUG("recvfrom %d bytes: %d %p %d", result, rec->sockfd, data, size);
DEBUG("errno=%d", local_errno);
chunk = iemnet__chunk_create_dataaddr(result, (result>0)?data:NULL, &from);
// call the callback with a NULL-chunk to signal a disconnect event.
(rec->callback)(rec->userdata, chunk);
iemnet__chunk_destroy(chunk);
}
t_iemnet_receiver*iemnet__receiver_create(int sock, void*userdata,
t_iemnet_receivecallback callback, int subthread)
{
t_iemnet_receiver*rec=(t_iemnet_receiver*)malloc(sizeof(
t_iemnet_receiver));
DEBUG("create new receiver for 0x%X:%d", userdata, sock);
//fprintf(stderr, "new receiver for %d\t%x\t%x\n", sock, userdata, callback);
if(rec) {
rec->sockfd=sock;
rec->userdata=userdata;
rec->callback=callback;
if(subthread) {
sys_lock();
}
sys_addpollfn(sock, pollfun, rec);
if(subthread) {
sys_unlock();
}
}
//fprintf(stderr, "new receiver created\n");
return rec;
}
void iemnet__receiver_destroy(t_iemnet_receiver*rec, int subthread)
{
int sockfd;
if(NULL==rec) {
return;
}
sockfd=rec->sockfd;
if(subthread) {
sys_lock();
}
sys_rmpollfn(rec->sockfd);
// FIXXME: read any remaining bytes from the socket
if(subthread) {
sys_unlock();
}
DEBUG("[%p] really destroying receiver %d", sockfd);
DEBUG("[%p] closed socket %d", rec, sockfd);
rec->sockfd=-1;
rec->userdata=NULL;
rec->callback=NULL;
free(rec);
rec=NULL;
}
/* just dummy, since we don't maintain a queue any more */
int iemnet__receiver_getsize(t_iemnet_receiver*x)
{
if(x) {
return 0;
}
return -1;
}
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