Re: call is blocked in recvfrom() and no further proceedings in Wi
- From: "Paul G. Tobey [eMVP]" <ptobey no spam AT no instrument no spam DOT com>
- Date: Fri, 18 Nov 2005 09:22:30 -0700
Hmmm. Good idea and thanks for reporting back. I was never able to get
that to work, even with the virtual switch, but maybe there's been an update
or my problem was something else.
Paul T.
"Sudha.v" <Sudhav@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:D5514C73-B772-4380-A264-A79B809EB2DC@xxxxxxxxxxxxxxxx
> Paul. I have found the fix for this issue after having done somany
> research.
> Anyways, thanks to you for constant reply to my queries.
> For this problem we have to change the configuration in Platform
> manager(EVC) for emulator as shown below.
>
> For transmitting UDP packets through emulator, do the following
> configuration in EVC platform manager for emulator.
> Tools --> Configure Platform Manager --> Select Smartphone 2003
> emulator-->
> Properties --> TCP/IP Transport for Windows CE (this should be select for
> Transport)
> -->Emulator startup server ( this is for startup server). -->Configure -->
> Communication --> Ethernet (for this, select Virtual switch(Actually this
> filed was set to NAT(OutgoingOnly) which was ultimately blocking the
> imcomming data ) from the drop down list.
>
> Now the emulator will support for UDP/TCP transmission. :)
> I just wanted to share this info in the discussion so that, If any people
> have this kind of issue, they can follow this to change the configuration
> inorder to support TCP/UDP tranmission through emulator.
>
>
> Cheers,
> Sudha.v
>
>
>
>
>
>
>
>
> --
> Attempting half-heartedly is like expecting failure and achieving it.
>
>
> "Paul G. Tobey [eMVP]" wrote:
>
>> There is no fix for trying to send UDP other than to use real networking.
>> If you have a real network card, it *does* work (done it many times). If
>> you use ActiveSync, it will not work.
>>
>> You say that bind() fails? What error code is returned from
>> WSAGetLastError() (those error codes actually *do* communicate
>> information!)?
>>
>> The emulator is another 'device' scenario that doesn't work with UDP
>> (incoming, at least), so you really need a real device with real network
>> connections to test anything...
>>
>> Paul T.
>>
>> "Sudha.v" <Sudhav@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
>> news:001C7C30-2654-4CEC-8A69-7008CA8E6308@xxxxxxxxxxxxxxxx
>> > Thanks for your reply. Here I'm simlifying my problem. Just have a look
>> > and
>> > let me know if you can find something on it.
>> > I have to create an application which will have two sockets. These two
>> > sockets communicates with server through two different ports. For
>> > sending
>> > request in one port(for ex 5070). and for receiving in another
>> > port(5090).
>> > Actually in windows I'm able to do it.
>> > In windows CE, I'm able to send a request but I'm unable to receive it.
>> > Scenario in windows
>> > 1. Create socket. (for transmission)
>> > 2. Create another socket & bind with server IP address( For reception).
>> > The above steps are fine and application works properly.
>> > Scenario in windows CE.
>> > 1. Create socket. (for transmission) - Success
>> > 2. Create another socket & bind with server IP address( For
>> > reception). -
>> > failure.
>> >
>> > what I guess is, If I'm able to bind with server IP address, I can
>> > achieve
>> > the desired result.
>> > So any idea of how to fix this issue with TCP/UDP?
>> >
>> > Any help would be greatly appreciated.
>> >
>> > Note : In my application, server is a NT service and it will receive
>> > request
>> > and send response. So, If TCP is used, connect() will be succeeded. But
>> > application will be blocked in accept(). Because there is no socket to
>> > connect from other end.
>> > And without accept I can't receive the data.
>> > So, UDP would be preferable. Right now I'll check this will emulator.
>> > later
>> > i'll use GPRS for communication. I wouldn't use ActiveSync.
>> >
>> > Sudha
>> > --
>> > Attempting half-heartedly is like expecting failure and achieving it.
>> >
>> >
>> > "Sudha.v" wrote:
>> >
>> >> In the below code, application simply keeps on waiting for incoming
>> >> data(Means, call is blocked in recvfrom() and no further proceedings).
>> >> Environment : EVC++ 4.0, Smart phone 2003 SDK Emulator.
>> >> Simple intro about the application.
>> >> An NT service is running in my system(PC) which is nothing but the
>> >> server.
>> >> My program has to send request to service through port 5070(in this
>> >> port
>> >> only
>> >> server is receiving the requests). Depending upon request, server
>> >> will
>> >> send
>> >> response back to the program in port 5090. and application uses UDP.
>> >> · So In the code, socket "s" will send request to NT service.
>> >> · And "sock" will receive the response.
>> >> · Everything seems to be OK. But during debugging the application
>> >> infinitely
>> >> waiting in recvfrom() call. This call is not at all returning.
>> >> But the same code is working in windows. Only in Windows CE it is not
>> >> working.
>> >> In order to find whether data is available in the port or not, I have
>> >> done
>> >> the following.
>> >> · Sent data from Windows CE(i.e., socket is created in EVC++ 4.0 to
>> >> send
>> >> request to NT service).
>> >> · Received the response in Windows(means, for reception I created
>> >> socket
>> >> in
>> >> VC++ 6.0 and data is successfully received).
>> >> · From the above two steps, I'm clear that, data is available in the
>> >> specific port (i.e, in 5090).
>> >> So, the issue is in Windows CE, recvfrom() call is infinitely waiting
>> >> and
>> >> not returning even though the packet is available in the specific net
>> >> work
>> >> address.
>> >> You may be annoyed of seeing this bulk of code. But I'm desperately in
>> >> need
>> >> of the solution. So, please have a look at the code. Your help is
>> >> greatly
>> >> appreciated.
>> >>
>> >> #include <stdio.h>
>> >> #include <stdlib.h>
>> >> #include <malloc.h>
>> >>
>> >> #include <windows.h>
>> >> #include <windowsx.h>
>> >> #include <winsock2.h>
>> >> #include <ws2tcpip.h>
>> >> #include <string.h>
>> >> #define DEFAULT_FAMILY AF_UNSPEC
>> >> #define DEFAULT_SOCKTYPE SOCK_DGRAM
>> >> #define DEFAULT_PORT "5090"
>> >> #define BUFFER_SIZE 23 // length of "WinCE
>> >> Echo
>> >> Test Packet"
>> >> #define TIMEOUT_SECS 2
>> >> #define TIMEOUT_USECS 0
>> >> SOCKET sock = INVALID_SOCKET;
>> >> int nFamily = DEFAULT_FAMILY;
>> >> int nSockType = DEFAULT_SOCKTYPE;
>> >> char szRemoteName[64] = "INFBA01803";
>> >> char *szPort = DEFAULT_PORT;
>> >> SOCKADDR_STORAGE ssRemoteAddr;
>> >> int cbXfer, cbTotalRecvd, cbRemoteAddrSize;
>> >> WSADATA wsaData;
>> >> ADDRINFO Hints, *AddrInfo = NULL, *AI;
>> >> char szRemoteAddrString[128];
>> >> fd_set fdReadSet;
>> >> TIMEVAL timeout = {TIMEOUT_SECS, TIMEOUT_USECS};
>> >> char pRecvBuf[BUFFER_SIZE];
>> >> struct ip_mreq mreq;
>> >> SOCKET sock, SockServ[FD_SETSIZE];
>> >> fd_set fdSockSet;
>> >> int nNumSocks, nNumSocksCount;
>> >> char pBuf[] = "WinCE Echo Test Packet";
>> >> int iReceiveStatus;
>> >>
>> >> //Change these if required
>> >> #define USERNAME "sudhagar" //TODO
>> >> #define PWD "nopass" //TODO
>> >> #define INV_TO "sandeep" //TODO
>> >> #define IP_SERVER "172.29.12.154"//TODO
>> >> #define PORT_SERVER "5070" //TODO
>> >> TIMEVAL ReceiveTimeout;
>> >> int iRC = 0;
>> >> int iSendStatus = 0;
>> >> int SIPlib_main()
>> >> {
>> >> int i=0,j=0,k,infop1;
>> >> char *reg_dest,*inv_dest,*bhr= NULL ,*nnop1;
>> >> int x=0,reg_id=-1;
>> >> char tmp[200],locip[50];
>> >> unsigned int addr2=0;
>> >> osip_proxy_authorization_t *proxy_auth;
>> >> int cbXfer, cbTotalRecvd, cbRemoteAddrSize;
>> >> TCHAR *str;
>> >> SOCKET s,s1;
>> >> struct sockaddr_in addr,addr1;
>> >> char packetbuffer[1200]={{'\0'}},packetbuffer1[1000]={{'\0'}};
>> >> WSADATA dat ;
>> >>
>> >> ///////////////
>> >> SOCKET SIPRTPSOC;
>> >> struct sockaddr_in addr21;
>> >> char nextnon1[50];
>> >> char *buf2;
>> >> buf2=(char*)malloc(8*sizeof(char));
>> >> ///////////////
>> >> //End of variable declarations
>> >>
>> >> if(WSAStartup(MAKEWORD(2,2), &wsaData))
>> >> {
>> >> return 1;
>> >> }
>> >> sock = INVALID_SOCKET;
>> >> for(i = 0; i < FD_SETSIZE; i++)
>> >> SockServ[i] = INVALID_SOCKET;
>> >>
>> >> // Get a list of available addresses to serve on
>> >>
>> >> memset(&Hints, 0, sizeof(Hints));
>> >> Hints.ai_family = nFamily;
>> >> Hints.ai_socktype = nSockType;
>> >> Hints.ai_flags = AI_NUMERICHOST | AI_PASSIVE;
>> >> if(getaddrinfo(NULL, szPort, &Hints, &AddrInfo))
>> >> {
>> >> OutputDebugString(TEXT("ERROR: Couldn't get resolve the server
>> >> name/address!"));
>> >> }
>> >> nNumSocksCount = 0;
>> >> for(AI = AddrInfo; AI != NULL; AI = AI->ai_next)
>> >> {
>> >> if (nNumSocksCount == FD_SETSIZE)
>> >> {
>> >> // getaddrinfo returned more addresses than we could use
>> >> break;
>> >> }
>> >>
>> >> if((AI->ai_family == PF_INET) || (AI->ai_family == PF_INET6))
>> >> //
>> >> only want PF_INET or PF_INET6
>> >> {
>> >> SockServ[nNumSocksCount] = socket(AI->ai_family,
>> >> AI->ai_socktype, AI->ai_protocol);
>> >> if (SockServ[nNumSocksCount] != INVALID_SOCKET)
>> >> {
>> >> if (bind(SockServ[nNumSocksCount], AI->ai_addr,
>> >> AI->ai_addrlen) == SOCKET_ERROR)
>> >> closesocket(SockServ[nNumSocksCount]);
>> >> else
>> >> {
>> >> OutputDebugString(
>> >> TEXT("Socket 0x%08x ready for connection with
>> >> %hs
>> >> family, %hs type, on port %hs\r\n"),
>> >> SockServ[nNumSocksCount],
>> >> (AI->ai_family == AF_INET) ? "AF_INET" :
>> >> ((AI->ai_family == AF_INET6) ? "AF_INET6" : "UNKNOWN"),
>> >> (AI->ai_socktype == SOCK_STREAM) ? "TCP" :
>> >> ((AI->ai_socktype == SOCK_DGRAM) ? "UDP" : "UNKNOWN"),
>> >> szPort);
>> >> nNumSocksCount++;
>> >> }
>> >> }
>> >> }
>> >> }
>> >>
>> >> freeaddrinfo(AddrInfo);
>> >>
>> >> if (nNumSocksCount == 0)
>> >> {
>> >> OutputDebugString(TEXT("ERROR: Unable to serve on any address.
>> >> Error
>> >> = %d\r\n"), WSAGetLastError());
>> >> goto Cleanup;
>> >> }
>> >> //Initializing socket s for transmission
>> >> s = socket(PF_INET,SOCK_DGRAM,IPPROTO_UDP);
>> >> memset(&addr,0,sizeof(struct sockaddr_in));
>> >> addr.sin_family = PF_INET;
>> >> addr.sin_addr.s_addr = inet_addr(IP_SERVER);//Server IP
>> >> addr.sin_port = htons((short )atoi(PORT_SERVER));//(5 0 7 0); Server
>> >> Listen
>> >> Port
>> >> //1st Transmission ( REGISTER )
>> >> i=sendto(s,reg_dest,strlen(reg_dest),0,(struct sockaddr
>> >> *)&addr,sizeof(struct sockaddr_in));
>> >> NKDbgPrintfW(L"\nSent : %d bytes\n\n",i);
>> >> if(i != strlen(reg_dest))
>> >> {
>> >> OutputDebugString(TEXT("ERROR: Couldn't send the data! error =
>> >> %d\r\n"), WSAGetLastError());
>> >> }
>> >> // Wait for incomming data/connections
>> >> nNumSocks = nNumSocksCount;
>> >> FD_ZERO(&fdSockSet);
>> >> for (i = 0; i < nNumSocks; i++) // want to check all available
>> >> sockets
>> >> FD_SET(SockServ[i], &fdSockSet);
>> >> if (select(nNumSocks, &fdSockSet, 0, 0, NULL) == SOCKET_ERROR)
>> >> {
>> >> OutputDebugString(TEXT("ERROR: select() failed with error =
>> >> %d\r\n"), WSAGetLastError());
>> >> goto Cleanup;
>> >> }
>> >> for (i = 0; i < nNumSocks; i++) // check which socket is ready to
>> >> process
>> >> {
>> >> if (FD_ISSET(SockServ[i], &fdSockSet)) // proceed for
>> >> connected
>> >> socket
>> >> {
>> >> FD_CLR(SockServ[i], &fdSockSet);
>> >> if(nSockType == SOCK_STREAM)
>> >> {
>> >> cbRemoteAddrSize = sizeof(ssRemoteAddr);
>> >> sock = accept(SockServ[i], (SOCKADDR*)&ssRemoteAddr,
>> >> &cbRemoteAddrSize);
>> >> if(sock == INVALID_SOCKET)
>> >> {
>> >> OutputDebugString(TEXT("ERROR: accept() failed
>> >> with
>> >> error = %d\r\n"), WSAGetLastError());
>> >> goto Cleanup;
>> >> }
>> >> OutputDebugString(TEXT("Accepted TCP connection from
>> >> socket
>> >> 0x%08x\r\n"), sock);
>> >> }
>> >> else
>> >> {
>> >> sock = SockServ[i];
>> >> OutputDebugString(TEXT("UDP data available on socket
>> >> 0x%08x\r\n"), sock);
>> >> }
>> >> break; // Only need one socket
>> >> }
>> >> }
>> >> // Receive data from a client
>> >>
>> >> cbTotalRecvd = 0;
>> >> do
>> >> {
>> >> cbRemoteAddrSize = sizeof(ssRemoteAddr);
>> >> cbXfer = recvfrom(sock, packetbuffer + cbTotalRecvd,
>> >> sizeof(packetbuffer) - cbTotalRecvd, 0,
>> >> (SOCKADDR *)&ssRemoteAddr, &cbRemoteAddrSize);
>> >> cbTotalRecvd += cbXfer;
>> >> } while(cbXfer > 0 && cbTotalRecvd < sizeof(packetbuffer));
>> >>
>> >> OutputDebugString(TEXT("SUCCESS - Received %d bytes from client
.
- References:
- call is blocked in recvfrom() and no further proceedings in Win CE
- From: Sudha.v
- RE: call is blocked in recvfrom() and no further proceedings in Win CE
- From: Sudha.v
- Re: call is blocked in recvfrom() and no further proceedings in Win CE
- From: Paul G. Tobey [eMVP]
- Re: call is blocked in recvfrom() and no further proceedings in Wi
- From: Sudha.v
- call is blocked in recvfrom() and no further proceedings in Win CE
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