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author | Guido van Rossum <guido@python.org> | 1995-03-01 14:36:00 (GMT) |
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committer | Guido van Rossum <guido@python.org> | 1995-03-01 14:36:00 (GMT) |
commit | 81b3060b1409003625e48e56a49b8e910cc9a2b5 (patch) | |
tree | fbf36e8fb67ec1c1f5c708287e473cda355a80b7 /Doc/lib/libtempfile.tex | |
parent | 51bbdfb2ffe9cb2bfce56bd7877928d8936ea283 (diff) | |
download | cpython-81b3060b1409003625e48e56a49b8e910cc9a2b5.zip cpython-81b3060b1409003625e48e56a49b8e910cc9a2b5.tar.gz cpython-81b3060b1409003625e48e56a49b8e910cc9a2b5.tar.bz2 |
en weer twee!
Diffstat (limited to 'Doc/lib/libtempfile.tex')
-rw-r--r-- | Doc/lib/libtempfile.tex | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/Doc/lib/libtempfile.tex b/Doc/lib/libtempfile.tex new file mode 100644 index 0000000..84bd641 --- /dev/null +++ b/Doc/lib/libtempfile.tex @@ -0,0 +1,50 @@ +\section{Built-in module \sectcode{tempfile}} +\stmodindex{tempfile} +\indexii{temporary}{file name} +\indexii{temporary}{file} + +\renewcommand{\indexsubitem}{(in module tempfile)} + +This module generates temporary file names. It is not UNIX specific, +but it may require some help on non-UNIX systems. + +Note: the modules does not create temporary files, nor does it +automatically remove them when the current process exits or dies. + +The module defines a single user-callable function: + +\begin{funcdesc}{mktemp}{} +Return a unique temporary filename. This is an absolute pathname of a +file that does not exist at the time the call is made. No two calls +will return the same filename. +\end{funcdesc} + +The module uses two global variables that tell it how to construct a +temporary name. The caller may assign values to them; by default they +are initialized at the first call to \code{mktemp()}. + +\begin{datadesc}{tempdir} +When set to a value other than \code{None}, this variable defines the +directory in which filenames returned by \code{mktemp()} reside. The +default is taken from the environment variable \code{TMPDIR}; if this +is not set, either \code{/usr/tmp} is used (on UNIX), or the current +working directory (all other systems). No check is made to see +whether its value is valid. +\end{datadesc} +\ttindex{TMPDIR} + +\begin{datadesc}{template} +When set to a value other than \code{None}, this variable defines the +prefix of the final component of the filenames returned by +\code{mktemp()}. A string of decimal digits is added to generate +unique filenames. The default is either ``\code{@\var{pid}.}'' where +\var{pid} is the current process ID (on UNIX), or ``\code{tmp}'' (all +other systems). +\end{datadesc} + +Warning: if a UNIX process uses \code{mktemp()}, then calls +\code{fork()} and both parent and child continue to use +\code{mktemp()}, the processes will generate conflicting temporary +names. To resolve this, the child process should assign \code{None} +to \code{template}, to force recomputing the default on the next call +to \code{mktemp()}. |