Re: [PATCH 1/2] Warn when accessing binaries over RSP

Andrew Burgess
2015-08-11T11:55:47Z

* Gary Benson <gbenson@redhat.com> [2015-08-05 16:28:15 +0100]:

>
> diff --git a/gdb/gdb_bfd.c b/gdb/gdb_bfd.c
> index 1781d80..b511777 100644
> --- a/gdb/gdb_bfd.c
> +++ b/gdb/gdb_bfd.c
> @@ -219,13 +219,38 @@ gdb_bfd_iovec_fileio_open (struct bfd *abfd, void *inferior)
> const char *filename = bfd_get_filename (abfd);
> int fd, target_errno;
> int *stream;
> + struct target_ops *ops = find_target_at (process_stratum);
>
> gdb_assert (is_target_filename (filename));
> + filename += strlen (TARGET_SYSROOT_PREFIX);
> +
> + /* GDB provides no indicator of progress during file operations, and
> + can appear to have locked up during slow remote transfers, so we
> + inform the user what is happening and suggest a way out. It's
> + unpleasant that we need to detect remote targets this way (rather
> + than putting the warnings in remote_hostio_open), but it's not
> + possible for remote_hostio_open to differentiate between
> + accessing inferior binaries (which can be bypassed) and accessing
> + things like /proc/ (which is unavoidable). */
> + if (strcmp (ops->to_shortname, "remote") == 0
> + || strcmp (ops->to_shortname, "extended-remote") == 0)
> + {
> + static int warning_issued = 0;
> +
> + printf_unfiltered (_("Reading %s from remote target\n"),
> + filename);
> +
> + if (!warning_issued)
> + {
> + warning (_("File transfers from remote targets can be slow.\n"
> + "Use \"set sysroot\" to access files locally"
> + " instead."));
> + warning_issued = 1;
> + }
> + }

Altering the behaviour based on to_shortname feels like breaking this
nice target OO model we have.

Could the warning not be moved down into target_fileio_open instead?

Or if that's really not an appropriate place should we add a new
target method?

Thanks,
Andrew