[Function]
system: add-fd-handler
fd direction function
This function installs and returns a new handler for the file descriptor fd. direction can be either :input if the system should invoke the handler when input is available or :output if the system should invoke the handler when output is possible. This returns a unique object representing the handler, and this is a suitable argument for system:remove-fd-handler function must take one argument, the file descriptor.
[Function]
system: remove-fd-handler
handler
This function removes handler, that add-fd-handler must have previously returned.
[Macro]
system: with-fd-handler
(direction fd function)
form
This macro executes the supplied forms with a handler installed using fd, direction, and function. See system:add-fd-handler.
[Function]
system: wait-until-fd-usable
direction fd &optional timeout
This function waits for up to timeout seconds for fd to become usable for direction (either :input or :output). If timeout is nil or unspecified, this waits forever.
[Function]
system: invalidate-descriptor
fd
This function removes all handlers associated with fd. This should only be used in drastic cases (such as I/O errors, but not necessarily EOF). Normally, you should use remove-fd-handler to remove the specific handler.