Galcon Games
Phil Hassey - game dev blog
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Getting ENet to work with Marmalade

Through a bit of Googling and whatnot, I got in touch with Joe Delgado who was able to provide a patch to fix ENet to work with Marmalade. These are modifications to unix.c. When I am making a Marmalade build of my games, I always have PLATFORM_MARMALADE defined. So you can replace that with whatever you do.

After the #ifdef __APPLE__ segment, add this to set up the correct defines, etc.

#ifdef PLATFORM_MARMALADE
#define SOMAXCONN 128
#undef HAS_POLL
#undef HAS_MSGHDR_FLAGS
#undef HAS_FCNTL
#include <sys/select.h>
#include <sys/uio.h>
#define HAS_SOCKLEN_T
#endif

In enet_socket_send, it turns out the Marmalade sendmsg is broken. So I replace:

    msgHdr.msg_iov = (struct iovec *) buffers;
    msgHdr.msg_iovlen = bufferCount;
    sentLength = sendmsg (socket, & msgHdr, MSG_NOSIGNAL);

With

#ifdef PLATFORM_MARMALADE
    // concatenates buffers together

    ENetBuffer * newBuffers;
    char* d;
    int i, totalSize;

    newBuffers = (ENetBuffer*)malloc(sizeof(ENetBuffer));
    totalSize = 0;
    for (i=0;i<bufferCount;i++) {
        totalSize += (buffers+i)->dataLength;
    }

    newBuffers->data = malloc(totalSize);
    newBuffers->dataLength = totalSize;
    d = (char*)newBuffers->data;
    for (i=0;i<bufferCount;i++) {
        memcpy(d, (buffers+i)->data, (buffers+i)->dataLength);
        d += (buffers+i)->dataLength;
    }

    msgHdr.msg_iov = (struct iovec *) newBuffers;
    msgHdr.msg_iovlen = totalSize;

    sentLength = sendmsg (socket, & msgHdr, MSG_NOSIGNAL);

    free(newBuffers->data);
    free(newBuffers);

#else

    msgHdr.msg_iov = (struct iovec *) buffers;
    msgHdr.msg_iovlen = bufferCount;
    sentLength = sendmsg (socket, & msgHdr, MSG_NOSIGNAL);

#endif

And that seems to get ENet working 100% with Marmalade. I applied this patch to ENet 1.3.6 … The original patch was written for ENet 1.3.3, and I suspect it would work for the latest version of ENet. I built this with Marmalade 6.3.2. I’ve passed on a request to the Marmalade team to fix sendmsg so that the larger chunk of the code would no longer be necessary.

-Phil

One Response to “Getting ENet to work with Marmalade”

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