On UNIX, this is taken from the TMPDIR environment variable.
If the variable is not set, P_tmpdir is
used, as defined by the system C library. Failing that, a
hard-coded default of "/tmp" is returned.
On Windows, the TEMP environment variable is used, with the
root directory of the Windows installation (eg: "C:\") used
as a default.
The encoding of the returned string is system-defined. On Windows,
it is always UTF-8. The return value is never %NULL or the empty
string.
Gets the directory to use for temporary files.
On UNIX, this is taken from the TMPDIR environment variable. If the variable is not set, P_tmpdir is used, as defined by the system C library. Failing that, a hard-coded default of "/tmp" is returned.
On Windows, the TEMP environment variable is used, with the root directory of the Windows installation (eg: "C:\") used as a default.
The encoding of the returned string is system-defined. On Windows, it is always UTF-8. The return value is never %NULL or the empty string.
Return: the directory to use for temporary files.