nanogui: Thread: Microwindows Version 0.89pre6 Bug Report.

We find a bug in Microwindows 0.89 pre 6 version, please check it out.

Now we are designing a network product, using Microwindows as the GUI,
we do next step:

step 1. Create a socket, and connect to then server.
step 2. Add the socket(file description) to FD_SET.
    Because of Microwindows providing a mechanism to listen the fds, we
call MwRegisterFdInput(MainHwnd, fd) and
    MwRegisterFdOutput(MainHwnd, fd).
step 3. The network cannot work and my mouse and keyboard are not
working yet! What's wrong with it?
step 4.  We check the winmain.c source file, and found that
MwRegisterFdInput()/MwRegisterFdOutput()/MwRegisterFdExcept() have some
error.
    For example, I can register a socket for reading and writing at the
same time, but when I register the socket for reading, in
MwRegisterFdInput() will set this socket's read field(HWND), and set the
next with "-1"(assume I have only a socket Added.) Then call
MwRegisterFdOutput() will set this socket's write field(HWND), and set
the next with userregfd_head(now userregfd_head == this socket fd), so
here's a dead loop! When goes into MwSelect(), load user register fds
into FD_SET, will dead loop!
step 5. Fix this bug.
   please modify winmain.c:
     (1)In function void MwRegsterFdInput(HWND hwnd, int fd), replace "if
(userregfd[fd].next == -1)" with "if ((userregfd[fd].next == -1) &&
(!userregfd[fd].write) && (!userregfd[fd].except))".
     (2)In function void MwRegsterFdOutput(HWND hwnd, int fd), replace
"if (userregfd[fd].next == -1)" with "if ((userregfd[fd].next == -1) &&
(!userregfd[fd].read) && (!userregfd[fd].except))".
     (3)In function void MwRegsterFdExcept(HWND hwnd, int fd), replace
"if (userregfd[fd].next == -1)" with "if ((userregfd[fd].next == -1) &&
(!userregfd[fd].write) && (!userregfd[fd].read))".

I'm very sorry that my English is too poor, and could not descript the
fact clearly, please try use next code.

int socketfd;
socketfd = socket();  // Create a socket
connect();  // Connect to server
MwRegisterFdInput(hwnd, socketfd);    // Register to Microwindows
MwRegisterFdOutput(hwnd, socketfd); // Register to Microwindows

// In  MwSelect(), dead loop.


Best regards,
Yang Jingsong.
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SEL SYSTEM LTD.
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