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Diffstat (limited to 'xpa/notes/winport.note')
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1 files changed, 81 insertions, 0 deletions
diff --git a/xpa/notes/winport.note b/xpa/notes/winport.note new file mode 100644 index 0000000..fb7b46d --- /dev/null +++ b/xpa/notes/winport.note @@ -0,0 +1,81 @@ +Documentation: + +The URL: + + http://msdn.microsoft.com/library + +has a good Unix Application Migration Guide as well as Win32 API. + + MINGW32 +Problems: + +client.c: + +The select() function does not work on stdio files, so xpaset cannot add +stdio to select(). This means that "cat foo.fits | xpaset ds9" is not +implemented. This is a client side problem and would not affect ds9 running +as an xpa server. + +xpaio.c and others: + +Win32 does not support most Unix signal handling, and in particular, the +SIGALRM signal. This means that XPA will hang indefinitely on a system +call, i.e., there is no timeout support corresponding to XPA_LONG_TIMEOUT +and XPA_SHORT_TIMEOUT. This affects both clients and servers. + +timedconn.c: + +Again, lack of support for SIGALRM means alrmconnect() is not implemented. +For some reason, noblkconect() also did not work properly, so I had to +use theregular connect() in client.c and hang until further notice. This +is a client side problem and would not affect ds9 as an xpa server. + +launch.c: + +Without fork(), its not obvious how to make the code wait for the +child to start. In the end, I used simply called win32 spawnvp(), put +a short sleep into the parent, and hoped for the best. + +find.c: + +Couldn't find the access mode bits (S_IRUSR, S_IWUSR, S_IXUSR) in win32, +so access checking in find() is not supported. + +Code Changes: + +xpa.c, client.c (sockets) + +Ironically, wsock64 has an FD_SETSIZE of 64 and I had to redefine this to +8192 to make XPA sockets work. + +For wsock32 sockets, we must initialize wsock32 using: + + WSADATA wsaData; + ... + if( WSAStartup(MAKEWORD(2,0), &wsaData) ) != 0 ) {handle error}; + +and clean up at the time of exit: + + WSACleanup(); + +The close(sock) call is replaced by closesocket(sock). + +The call: + + fcntl(sock, F_SETFD, FD_CLOEXEC); + +is not needed or implemented (since sockets do not survive across exec) and +must be commented out. + +Calls to: + + flags = fcntl(client->datafd, F_GETFL); + fcntl(client->datafd, F_SETFL, flags|NONBIO); + +get changed to: + + int flags=1; + ioctlsocket(socket, FIONBIO, (u_long FAR *)&flags); + + + |