_dbus_write/read/poll etc and regular files

[Rob Taylor]

On Mon, 2005-01-17 at 18:13 +0000, Tor Lillqvist wrote:
> Havoc Pennington writes:
>  > Another approach maybe is:
>  >  typedef struct
>  >  {
>  >    DBusStreamType type; /* DBUS_STREAM_SOCKET, DBUS_STREAM_FILE, etc. */
>  >    int value;
>  >  } DBusStream;
>  > 
>  > And have _dbus_poll (or _dbus_wait_for_multiple_streams()) take one of
>  > those instead of just an fd... then in the win32 implementation could
>  > you unpack which descriptors are files and which are sockets, and
>  > construct a WaitForMultipleObjects() call that can wait on both at once?
> 
> Yes but no ;-) It's more or less impossible to do select()-like wait
> on a random C file descriptor. Well, nothing is impossible of course,
> but it will take a lot of work and debugging, and the code will be
> rather differently structured from what's used on Unix. Restricting
> yourself to sockets makes for more elegant code, and increases code
> reuse and/or sharing of code paths with Unix.
> 

Out of interest, in what problematic way is WaitForMultipleObjects not
select-like?

Rob Taylor