+ directories are not supported here. The temporary directories and files
+ are automatically cleaned up (at the latest) when the program exits or
+ dies from a fatal signal such as SIGINT, SIGTERM, SIGHUP, but not if it
+ dies from a fatal signal such as SIGQUIT, SIGKILL, or SIGABRT, SIGSEGV,
+ SIGBUS, SIGILL, SIGFPE.
+
+ For the cleanup in the normal case, programs that use this module need to
+ call 'cleanup_temp_dir' for each successful return of 'create_temp_dir'.
+ The cleanup in the case of a fatal signal such as SIGINT, SIGTERM, SIGHUP,
+ is done entirely automatically by the functions of this module. */