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[PATCH, libgfortran] PR60324 Handle arbitrarily long path names


some systems such as GNU Hurd, don't define PATH_MAX at all, and on
some other systems many syscalls apparently work for paths longer than
PATH_MAX. Thus GFortran shouldn't truncate paths to PATH_MAX
characters, but rather use heap allocated buffers limited only by the
available memory. The attached patch implements this, with the
exception of the backtrace functionality where we cannot use malloc
since backtrace might be called from a signal handler.

Regtested on x86_64-unknown-linux-gnu, Ok for trunk?

2014-05-19  Janne Blomqvist  <>

    PR libfortran/60324
    * Regenerated.
    * configure: Regenerated.
    * (AC_CHECK_FUNCS_ONCE): Check for strnlen and
    * libgfortran.h (fc_strdup): New prototype.
    * runtime/string.c (strnlen): New fallback function.
    (strndup): New fallback function.
    (fc_strdup): New function.
    * io/close.c (st_close): Use fc_strdup.
    * io/open.c (new_unit): Likewise.
    (already_open): Likewise.
    * io/unit.c (filename_from_unit): Likewise.
    * io/unix.c (unpack_filename): Remove function.
    (regular_file): Rename to regular_file2, add path argument.
    (regular_file): New function calling regular_file2.
    (compare_file_filename): Use fc_strdup.
    (find_file): Likewise.
    (delete_file): Likewise.
    (file_exists): Likewise.
    (file_size): Likewise.
    (inquire_sequential): Likewise.
    (inquire_direct): Likewise.
    (inquire_formatted): Likewise.
    (inquire_access): Likewise.
    * io/unix.h (unpack_filename): Remove prototype.
    * runtime/main.c (please_free_exe_path_when_done): Change type to
    (store_exe_path): Use malloced buffer, grow as needed.

Janne Blomqvist

Attachment: path_max.diff
Description: Text document

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