tmpnam - Generate a string that is a valid non-existing file-name.
tpmnam -> filename
This command is a thin wrapper around the POSIX.1 tmpnam() kernel function.
The tmpnam function generates a string that is a valid filename and
that is not the name of an existing file. The tmpnam function
generates a different name each time it is called, (up to a number of
times that is defined by the compiler macro TMP_MAX).
Donald Lewin, "The POSIX Programmer's Guide"
R. Kupper
/builddir/build/BUILD/nest-simulator-3.3/nest-simulator-3.3/sli/filesystem.cc