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79 lines
3.5 KiB
TeX
79 lines
3.5 KiB
TeX
\section{\module{tempfile} ---
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Generate temporary file names}
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\declaremodule{standard}{tempfile}
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\modulesynopsis{Generate temporary file names.}
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\indexii{temporary}{file name}
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\indexii{temporary}{file}
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This module generates temporary file names. It is not \UNIX{} specific,
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but it may require some help on non-\UNIX{} systems.
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The module defines the following user-callable functions:
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\begin{funcdesc}{mktemp}{\optional{suffix}}
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Return a unique temporary filename. This is an absolute pathname of a
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file that does not exist at the time the call is made. No two calls
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will return the same filename. \var{suffix}, if provided, is used as
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the last part of the generated file name. This can be used to provide
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a filename extension or other identifying information that may be
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useful on some platforms.
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\end{funcdesc}
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\begin{funcdesc}{TemporaryFile}{\optional{mode\optional{,
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bufsize\optional{, suffix}}}}
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Return a file (or file-like) object that can be used as a temporary
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storage area. The file is created in the most secure manner available
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in the appporpriate temporary directory for the host platform. Under
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\UNIX, the directory entry to the file is removed so that it is secure
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against attacks which involve creating symbolic links to the file or
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replacing the file with a symbolic link to some other file. For other
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platforms, which don't allow removing the directory entry while the
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file is in use, the file is automatically deleted as soon as it is
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closed (including an implicit close when it is garbage-collected).
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The \var{mode} parameter defaults to \code{'w+b'} so that the file
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created can be read and written without being closed. Binary mode is
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used so that it behaves consistently on all platforms without regard
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for the data that is stored. \var{bufsize} defaults to \code{-1},
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meaning that the operating system default is used. \var{suffix} is
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passed to \function{mktemp()}.
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\end{funcdesc}
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The module uses two global variables that tell it how to construct a
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temporary name. The caller may assign values to them; by default they
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are initialized at the first call to \function{mktemp()}.
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\begin{datadesc}{tempdir}
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When set to a value other than \code{None}, this variable defines the
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directory in which filenames returned by \function{mktemp()} reside.
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The default is taken from the environment variable \envvar{TMPDIR}; if
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this is not set, either \file{/usr/tmp} is used (on \UNIX{}), or the
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current working directory (all other systems). No check is made to
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see whether its value is valid.
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\end{datadesc}
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\begin{funcdesc}{gettempprefix}{}
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Return the filename prefix used to create temporary files. This does
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not contain the directory component. Using this function is preferred
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over using the \code{template} variable directly.
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\versionadded{1.5.2}
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\end{funcdesc}
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\begin{datadesc}{template}
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\deprecated{2.0}{Use \function{gettempprefix()} instead.}
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When set to a value other than \code{None}, this variable defines the
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prefix of the final component of the filenames returned by
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\function{mktemp()}. A string of decimal digits is added to generate
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unique filenames. The default is either \file{@\var{pid}.} where
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\var{pid} is the current process ID (on \UNIX{}),
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\file{\textasciitilde\var{pid}-} on Windows NT, \file{Python-Tmp-} on
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MacOS, or \file{tmp} (all other systems).
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Older versions of this module used to require that \code{template} be
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set to \code{None} after a call to \function{os.fork()}; this has not
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been necessary since version 1.5.2.
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\end{datadesc}
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