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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);
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