close-port - close a port
(import (rnrs)) ;R6RS
(import (rnrs io ports)) ;R6RS
(import (scheme base)) ;R7RS
Closes the port, rendering the port incapable of delivering
or accepting data. If
is an output port, it is flushed before being closed. This has no
effect if the port has already been closed. A closed port is still a
is a custom port then the closer procedure is called before the
port is really closed.
Returns unspecified values.
(define p (open-output-file "hello.txt"))
(display "Hello, world\n" p)
Ports are often connected to some limited resource, such as a file
descriptor. Closing ports is important to avoid resource leaks. Some
implementations will garbage collect ports, but this is not required.
This procedure is new in R6RS and R7RS.
This procedure can raise exceptions with the following condition types:
- &assertion (R6RS)
The wrong number of arguments was passed or an argument was outside its domain.
The assertions described above are errors.
Implementations may signal an error, extend the procedure's
domain of definition to include such arguments,
or fail catastrophically.
This page is part of the
It includes materials from the RnRS documents.
More information can be found at
It is often better to use
or one of the related procedures. They make it easier to ensure that a
port is closed when an exception is raised.
Markup created by unroff 1.0sc, March 04, 2023.