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Purpose:
Port to Windows platform
Bug fix
Description:
The Stream VFD is ported to Windows now.
Also fixed a bug where an application terminated when it got a SIGPIPE
due to sending/receiving on a closed socket.
Solution:
The socket stuff is treated different under Windows when using
the MS compilers to build HDF5. They define their own socket datatype
and have closesocket() instead of close(2) to close sockets.
Also there are different header files for all the socket stuff.
So I introduced my own socket decriptor datatype in H5FDstream.h
which should be used to pass in external sockets. This datatype
is mapped to either 'int' (UNIX-type sockets) or 'SOCKET' (Windows).
In the code the error code checking was adapted according to the
socket datatype used. Also, for Windows you have to call a routine
to initialize the Socket layer before using it.
As a kind of bug fix, the process signal mask is now set to ignore
SIGPIPE signals which otherwise cause the application to terminate.
The driver read/write routines catch this and return an error code.
Platforms tested:
Windows NT, both with MS Visual C++ compiler and with GNU cc
It is interesting that when compiling with GNU cc under Windows
it is possible to use both Windows and UNIX-type sockets (either
one or the other). So I check for GNU cc and go for UNIX sockets
if possible.
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Added source files for the Stream Virtual File Driver.
Description:
The Stream VFD allows users to stream complete HDF5 files
via socket connections between different applications.
Files which were created anew are flushed to any connected client
on each H5Fflush() or H5Fclose() operation.
Files which are opened as read-only will be read from a socket
on a H5Fopen() call.
The driver's H5FDset_fapl_stream() routine allows to pass in
several parameters such as an external socket descriptor,
some socket options, and flags for broadcasting a received file.
If an external socket is provided the Stream VFD would use that
for the socket calls. Otherwise it parses the filename argument
in H5Fcreate()/H5Fopen() for a 'hostname::port' parameter.
All files processed by the Stream VFD are kept in memory
(same way as the core VFD does).
Platforms:
Tested so far under Linux, Irix 32/64bit, OSF1, Solaris, Cray Unicos,
Hitachi SR8000, IBM AIX.
Not tested under Windows yet.
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