Kai Blin <[EMAIL PROTECTED]> 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 [EMAIL PROTECTED]
