| Allegro CL version 8.2 Unrevised from 8.1 to 8.2. 8.1 version |
Arguments:
Returns the pathname of the temporary directory used by the current
running Lisp for writing temporary files and sets, if necessary, the
value of sys:*temporary-directory*
to that
directory.
This function works as follows:
sys:*temporary-directory*
is examined. If
its value is nil
, a new temporary directory
is selected using the algorithm below.
sys:*temporary-directory*
is returned. If
the value returned by probe-file
is nil
, then a new temporary directory is
selected using the algorithm below.
In a freshly installed Lisp image, the initial value
of sys:*temporary-directory*
is nil
. However, in a user-built image (made
with dumplisp or
build-lisp-image or
generate-application), sys:*temporary-directory*
may have been
given a value, which might or might not be a valid value on the
machine where the image is run. If it is not a valid value, the
behavior is the same as when the value
is nil
. But it can happen (perhaps
unexpectedly) that the value is valid and in that case it is used.
If a temporary directory must be chosen, it is chosen according to the following algorithms.
On UNIX and the Mac: #p"/tmp/".
On Windows: the first of the following to be a valid directory is used:
When a directory is chosen by this algorithm, the value
of sys:*temporary-directory*
is set to it.
This function does not work with setf. It is
informational only. You can change the temporary directory by changing
the value of sys:*temporary-directory*
to the desired
directory pathname. Whenever this function is called, it tests
whether (probe-file sys:*temporary-directory*)
returns true, returning the value of sys:*temporary-directory*
when it
is. If (probe-file sys:*temporary-directory*)
returns nil
, a new value is chosen using the
algorithm above. Changing the temporary directory is not recommended.
Copyright (c) 1998-2016, Franz Inc. Oakland, CA., USA. All rights reserved.
This page was not revised from the 8.1 page.
Created 2010.1.21.
| Allegro CL version 8.2 Unrevised from 8.1 to 8.2. 8.1 version |