ntdll/server and unix_fd handling
Alexandre Julliard
julliard at winehq.org
Tue Jul 22 04:49:33 CDT 2008
Kai Blin <kai.blin at gmail.com> writes:
> After some more digging, upstream of the get_sock_fd call, the
> server_get_unix_fd() call always gets the same fd, either from wineserver or
> from the cache. wine_server_handle_to_fd() then seems to call dup() on the
> unix_fd. This seems to be needed because for some reason unix fds are used
> only temporary, so get_sock_fd is always followed by release_sock_fd(), which
> calls a close(). Why is this handled this way?
Because the file descriptor has to remain valid until it is released, so
we have to dup() it as it may get closed from a different thread in the
meantime. We can avoid the dup() in some cases in ntdll, but not in
other dlls since it would let anybody screw up the fd cache.
--
Alexandre Julliard
julliard at winehq.org
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