git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/map65@403 ab8295b8-cf94-4d9e-aec4-7959e3be5d79

plrr_subs_win.c

@@ -0,0 +1,90 @@
+#include <winsock2.h>
+#include <ws2tcpip.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#define HELLO_PORT 50004
+#define HELLO_GROUP "239.255.0.0"
+#define MSGBUFSIZE 1416
+
+struct sockaddr_in addr;
+int fd;
+
+//void __stdcall SETUP_RSOCKET(void)
+void setup_rsocket_(void)
+{
+  struct ip_mreq mreq;
+  u_int yes=1;
+
+  // Make sure that we have compatible Winsock support
+  WORD wVersionRequested;
+  WSADATA wsaData;
+  int err;
+ 
+  wVersionRequested = MAKEWORD( 2, 2 );
+  err = WSAStartup( wVersionRequested, &wsaData );
+  if ( err != 0 ) {
+    /* Tell the user that we could not find a usable */
+    /* WinSock DLL.                                  */
+    exit(1);
+  }
+ 
+  /* Confirm that the WinSock DLL supports 2.2.*/
+  /* Note that if the DLL supports versions greater    */
+  /* than 2.2 in addition to 2.2, it will still return */
+  /* 2.2 in wVersion since that is the version we      */
+  /* requested.                                        */
+ 
+  if ( LOBYTE( wsaData.wVersion ) != 2 ||
+       HIBYTE( wsaData.wVersion ) != 2 ) {
+    /* Tell the user that we could not find a usable */
+    /* WinSock DLL.                                  */
+    WSACleanup( );
+    exit(1); 
+  }
+  /* The WinSock DLL is acceptable. Proceed. */
+
+  /* create what looks like an ordinary UDP socket */
+  if ((fd=socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP)) < 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 __stdcall RECV_PKT(char buf[])
+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);
+  }
+}