WSJT-X/plrr_subs.c
Joe Taylor d9e8ad5d65 Removed unneeded header files from includes.
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/map65@395 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
2007-06-20 17:00:18 +00:00

68 lines
1.6 KiB
C

/* The following don't seem to be needed?
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <time.h>
#include <stdio.h>
*/
#include <arpa/inet.h>
#include <string.h>
#include <stdlib.h>
#define HELLO_PORT 50004
#define HELLO_GROUP "239.255.0.0"
#define MSGBUFSIZE 1416
struct sockaddr_in addr;
int fd;
void setup_rsocket_(void)
{
struct ip_mreq mreq;
u_int yes=1;
/* create what looks like an ordinary UDP socket */
if ((fd=socket(AF_INET,SOCK_DGRAM,0)) < 0) {
perror("socket");
exit(1);
}
/* allow multiple sockets to use the same PORT number */
if (setsockopt(fd,SOL_SOCKET,SO_REUSEADDR,&yes,sizeof(yes)) < 0) {
perror("Reusing ADDR failed");
exit(1);
}
/* set up destination address */
memset(&addr,0,sizeof(addr));
addr.sin_family=AF_INET;
addr.sin_addr.s_addr=htonl(INADDR_ANY); /* N.B.: differs from sender */
addr.sin_port=htons(HELLO_PORT);
/* bind to receive address */
if (bind(fd,(struct sockaddr *) &addr,sizeof(addr)) < 0) {
perror("bind");
exit(1);
}
/* use setsockopt() to request that the kernel join a multicast group */
mreq.imr_multiaddr.s_addr=inet_addr(HELLO_GROUP);
mreq.imr_interface.s_addr=htonl(INADDR_ANY);
if (setsockopt(fd,IPPROTO_IP,IP_ADD_MEMBERSHIP,&mreq,sizeof(mreq)) < 0) {
perror("setsockopt");
exit(1);
}
}
void recv_pkt_(char buf[])
{
int addrlen,nbytes;
addrlen=sizeof(addr);
if ((nbytes=recvfrom(fd,buf,1416,0,
(struct sockaddr *) &addr,&addrlen)) < 0) {
perror("recvfrom");
exit(1);
}
}