clean-temp: add support for temporary files anywhere

[Bruno Haible]

Sometimes, temporary files are better placed in temporary subdirectories,
so that you have full control over the file names and access permissions.

But sometimes, temporary files are better placed in a given directory,
so that you can be sure that a 'rename' to another name in the same
directory will succeed.

These two patches add support for creating temporary files at a given
place, with automatic cleanup.

And some documentation improvement.


2020-07-04  Bruno Haible  <bruno@clisp.org>

        clean-temp: Document limitations.
        * lib/clean-temp.h: Document limitations.

2020-07-04  Bruno Haible  <bruno@clisp.org>

        clean-temp: Add support for temporary files with unpredictable names.
        * lib/clean-temp.h (gen_register_open_temp): New declaration.
        * lib/clean-temp.c: Include tempname.h.
        (gen_register_open_temp): New function.
        * modules/tempname (configure.ac): Define a module indicator.

2020-07-04  Bruno Haible  <bruno@clisp.org>

        clean-temp: Add support for temporary files anywhere in the file system.
        * lib/clean-temp.h (register_temporary_file, unregister_temporary_file,
        cleanup_temporary_file): New declarations.
        * lib/clean-temp.c (file_cleanup_list_lock, file_cleanup_list): New
        variables.
        (dir_cleanup_list_lock): Renamed from cleanup_list_lock.
        (dir_cleanup_list): Renamed from cleanup_list.
        (cleanup_action): Process the file_cleanup_list as well.
        (do_init_clean_temp): New function.
        (clean_temp_once): New variable.
        (init_clean_temp): New function.
        (create_temp_dir): Invoke it.
        (register_temporary_file, unregister_temporary_file,
        cleanup_temporary_file): New functions.
        (do_unlink, do_rmdir): Remove 'dir' argument. Add 'cleanup_verbose'
        argument.

0001-clean-temp-Add-support-for-temporary-files-anywhere-.patch
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0002-clean-temp-Add-support-for-temporary-files-with-unpr.patch
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0003-clean-temp-Document-limitations.patch
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