This is not true for Tandem NonStop Kernel. See Joachim Schmitz's
comment in <http://bugs.gnu.org/10305#111>.
* gnulib.modules: Add root-uid.
* src/extract.c: Include <root-uid.h>.
(extr_init): Don't assume root is uid 0.
This lint was found by GCC 4.6.2 on Fedora 15 x86-64.
* src/buffer.c (buffer_write_global_xheader, mv_end, set_start_time)
(compute_duration, print_total_stats, flush_read, flush_write):
* src/checkpoint.c (checkpoint_finish_compile):
* src/list.c (test_archive_label):
* src/misc.c (chdir_count):
* src/names.c (const):
* src/unlink.c (finish_deferred_unlinks):
Define with (void) instead of with (), for slightly-better C type
checking and to avoid a GCC warning.
* src/compare.c (diff_dumpdir):
* src/tar.c (parse_owner_group): Remove unused local.
* src/misc.c (chdir_do):
* src/tar.c (add_exclude_array): Rename local to avoid shadowing.
(LOW_DENSITY_NUM, MID_DENSITY_NUM, HIGH_DENSITY_NUM):
Define only if needed.
* src/update.c (update_archive): Initialize a local; this fixes
what appears to be a real bug.
Problem reported by Pino Toscano in
<http://lists.gnu.org/archive/html/bug-tar/2012-01/msg00040.html>.
* gnulib.modules: Add fcntl-h, which defines
HAVE_WORKING_O_NOFOLLOW.
* src/extract.c (open_output_file): Use HAVE_WORKING_O_NOFOLLOW,
not O_NOFOLLOW, when testing whther O_NOFOLLOW works.
This file is a placeholder. It will be replaced with the actual ChangeLog
by make dist. Run make ChangeLog if you wish to create it earlier.
On Data Migration Facility (DMF), High Peformance Storage System (HPSS),
and presumably other file systems based on hierarchical storage, opening
a regular file with O_NONBLOCK can cause later reads to fail with
errno == EAGAIN. We need the O_NONBLOCK to avoid some security races.
Work around the problem by using fcntl to clear the O_NONBLOCK
flag if I/O fails with that errno value.
Problem reported by Vitezslav Cizek in
<http://lists.gnu.org/archive/html/bug-tar/2012-01/msg00000.html>.
* src/common.h (blocking_read, blocking_write): New decls.
* src/misc.c (blocking_read, blocking_write): New functions.
* src/compare.c (process_rawdata):
* src/create.c (dump_regular_file):
* src/extract.c (extract_file):
* src/sparse.c (sparse_scan_file, sparse_extract_region):
The regression was introduced by 8f390db9. This patch implements additional
option --skip-old-files, which silently skips members which would cause
writing over existing files, and restores --keep-old-files to its traditional
behavior.
* NEWS: Update.
* configure.ac: Update.
* doc/tar.texi: Document the changes.
* src/common.h (SKIP_OLD_FILES): New old_files mode.
* src/extract.c (maybe_recoverable): Restore KEEP_OLD_FILES behavior.
Handle SKIP_OLD_FILES.
* src/tar.c: New option --skip-old-files.
* tests/extrac18.at: New file.
* tests/extrac19.at: New file.
* tests/Makefile.am: Add new test cases.
* tests/testsuite.at: Likewise.
This is controlled by "existing-file" warning code, which is off
by default.
* src/common.h (WARN_EXISTING_FILE): New warning code.
(WARN_VERBOSE_WARNINGS): Add WARN_EXISTING_FILE.
* src/extract.c (maybe_recoverable): warn about existing file
if WARN_EXISTING_FILE is set.
* src/warning.c: New warning type: "existing-file"
* src/common.h (clear_directory_table): New proto.
* src/incremen.c (clear_directory_table): New function.
* src/compare.c (diff_dumpdir): Take a pointer to struct
tar_stat_info as argument.
Initialize its fd.
(diff_archive): Update call to diff_dumpdir.
(verify_volume): Call clear_directory_table.
The --owner and --group options now accept operands of the form
NAME:NUM, so that you can specify both symbolic name and numeric
ID for owner and group. Also, in these options, NAME no longer
needs to be present in the current host's user and group
databases; this implements Debian enhancement request 136231
<http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=136231> reported
by Mark W. Eichin, communicated by Thayne Harbaugh to bug-tar in
<http://lists.gnu.org/archive/html/bug-tar/2011-08/msg00001.html>.
* NEWS, doc/tar.texi (Option Summary, override): Document enhancement.
* src/common.h (group_name_option, owner_name_option): New decls.
* src/create.c (start_header): Don't assume owner and group names
are in current host database.
* src/tar.c (parse_owner_group): New function, for parsing NAME:NUM.
(parse_opt): Use it.
(decode_options): Initialize owner_name_option, group_name_option.
* tests/owner.at: New file, to test this enhancement.
* tests/Makefile.am (TESTSUITE_AT): Add it.
* tests/testsuite.at: Include it.
* src/tar.c (add_exclude_array): Take exclude option filags in its
second argument.
(parse_opt): Register backup_file_table with the EXCLUDE_WILDCARDS flag.
* tests/exclude07.at: New testcase.
* tests/Makefile.am (TESTSUITE_AT): Add testsuite.at.
* tests/testsuite.at: Include exclude07.at.
* src/extract.c (same_birthtime): Remove.
(extract_link, apply_delayed_links): Go back to using timestamp_cmp
instead of same_birthtime, as this is a bit simpler. This fix relies
on an up-to-date gnulib.
Without this fix, tar would sometimes mishandle the extraction of
hard links to symbolic links. Problem reported in
<http://lists.gnu.org/archive/html/bug-tar/2011-06/msg00000.html>
by Andreas Stolcke.
* src/extract.c (struct delayed_link): Change ctime member to birthtime.
(same_birthtime): New function.
(create_placeholder_file, extract_link, apply_delayed_links):
Use it to compare birthtimes (when available) instead of ctime.
reported by Eric Blake in
<http://lists.gnu.org/archive/html/bug-tar/2011-03/msg00000.html>.
* src/compare.c (diff_file): Do not restore atime of size-zero files.
* src/create.c (dump_file0): Likewise. Also, do not restore atime
when fd is zero, because that indicates a file we haven't opened.
There is no longer (since SunOS 4) any need to guard against
free (NULL), so replace each "if (p) free (p);" with "free (p);".
From Jim Meyering in
<http://lists.gnu.org/archive/html/bug-tar/2011-01/msg00026.html>.
* src/incremen.c (scan_directory, read_directory_file): As above.
(try_purge_directory): Likewise.
* src/list.c (read_header): Likewise.
* src/misc.c (assign_string): Likewise.
* src/sparse.c (pax_dump_header_1): Make sure the created header name is
shorter than NAME_FIELD_SIZE bytes.
* tests/sparse04.at: New testcase.
* tests/Makefile.am (TESTSUITE_AT): Add sparse04.at.
* tests/testsuite.at: Include sparse04.at.
* NEWS: Update.
Problem (and idea for fix) reported by Martin Weigel
<http://lists.gnu.org/archive/html/bug-tar/2010-11/msg00071.html>.
* src/common.h (is_individual_file): Remove decl.
* src/create.c (dump_file0): Replace "is_individual_file (p)"
with "top_level".
* src/incremen.c (procdir): Replace "!is_individual_file
(name_buffer)" with "st->parent". Fix bug with --one-file-system
and --listed-incremental.
* src/names.c (individual_file_table, register_individual_file):
(is_individual_file): Remove. All uses removed.
* NEWS: Document this.
* src/compare.c (verify_volume): Decode the header before invoking
diff_archive, as diff_archive no longer does this as of the
2010-06-28 commit. Also, don't try to invoke diff_archive on a
zero block.
* tests/Makefile.am (TESTSUITE_AT): Add verify.at.
* tests/testsuite.at: Include verify.at.
* tests/verify.at: New file.
Some compression programs are able to handle various compression formats
(e.g. `gzip' can decompress files created by `compress', `xz' is able
to handle lzma, etc.) Tar tries to use such programs for decompression
if the principal decompressor cannot be started.
* src/buffer.c (compress_type): Swap ct_none and ct_tar.
(archive_compression_type): New static variable.
(zip_magic): Remove program and option fields.
(zip_program): New structure and static.
(compress_program): Remove macro.
(find_zip_program): New static function.
(first_decompress_program,next_decompress_program): New functions.
(open_compressed_archive): Set archive_compression_type instead of
use_compress_program_option.
* src/common.h (first_decompress_program)
(next_decompress_program): New functions.
(WARN_DECOMPRESS_PROGRAM): New flag.
(WARN_VERBOSE_WARNINGS): Include WARN_DECOMPRESS_PROGRAM.
* src/warning.c (warning_args): Add "decompress-program".
(warning_types): Add WARN_DECOMPRESS_PROGRAM.
* src/system.c (run_decompress_program): New function.
(sys_child_open_for_uncompress): Use run_decompress_program
instead of calling execlp directly.
* src/create.c (write_gnu_long_link, start_header): Access
header->buffer + offsetof (struct posix_header, magic), instead of
header->header.magic, when reading or writing the OLDGNU_MAGIC
pattern. The code violates the C standard without this change,
and GCC warns about this if fortify checking is enabled. It's not
a bug on traditional (i.e., non-debugging) platforms, but it does
violate the C standard so it should be fixed. Problem originally
reported by John Emil Karlson in
<http://lists.gnu.org/archive/html/bug-tar/2010-04/msg00023.html>.
* src/list.c (decode_header): Likewise.
This bug was discovered on Solaris 8. On older hosts lacking
O_NOFOLLOW, tar -x --overwrite (without --dereference) follows
symbolic links, causing the "extract over symlinks" test to fail.
* src/extract.c (open_output_file): If O_NOFOLLOW is needed but
does not work, check for a symlink separately.
The commit 9c194c99 altered that order.
* src/list.c (transform_stat_info): New function. Split off from
decode_header.
(read_and): Call transform_stat_info right before do_something,
and after deciding if we should proceed with this member name,
so that name matching occurs before name transformation.
* tests/extrac17.at: New file.
* tests/Makefile.am (TESTSUITE_AT): Add extrac17.at
* tests/testsuite.at: Include extrac17.at.
Problem reported by Denis Excoffier in
<http://lists.gnu.org/archive/html/bug-tar/2010-10/msg00034.html>.
* src/extract.c (extract_dir): Use mkdirat, not mkdir.
* tests/extrac16.at: New file, to test for this bug.
* tests/Makefile.am (TESTSUITE_AT): Add it.
* tests/testsuite.at: Include it.
This file is a placeholder. It will be replaced with the actual ChangeLog
by make dist. Run make ChangeLog if you wish to create it earlier.
* configure.ac, NEWS: Version 1.24
* bootstrap: Restore tar-specific code lost during last
sync from gnulib (241b72ffad).
* src/misc.c (chdir_do): Remove unused automatic variable.
Without this change, if tar tried to extract a file A/B/C, noticed
that A/B didn't exist, attempted to mkdir A/B, and the mkdir
failed, it did not diagnose the mkdir failure, but simply reported
the failure to open A/B/C. This sometimes led to confusion
because it wasn't clear what tar was trying to do, in particular
that tar tried to mkdir A/B. With this patch, tar issues two
diagnostics in this case: one for A/B and the other for A/B/C.
Problem reported by Hauke Laging in
<http://lists.gnu.org/archive/html/bug-tar/2010-10/msg00020.html>.
* gnulib.modules: Remove faccessat.
* src/extract.c (make_directories): New arg INTERDIR_MADE.
Diagnose mkdir failure. Return 0 on success, nonzero on failure,
as opposed to nonzero iff some directory was created. All callers
changed. Simplify the code when mkdir fails, by checking whether
the desired file exists unless errno==EEXIST: this is more robust.
* tests/extrac15.at: New test, to check this.
* tests/Makefile.am (TESTSUITE_AT): Add it.
* tests/testsuite.at: Include it.
* bootstrap: Sync from gnulib.
* doc/.gitignore: Rename getdate.texi to parse-datetime.texi.
* doc/Makefile.am (tar_TEXINFOS): Likewise.
* doc/tar.texi (Top): Adjust to renaming of getdate to parse-datetime.
* gnulib.modules: Likewise. Also, remove ftruncate (now obsolete).
And add inttostr (we missed this dependency).
* src/tar.c: Include parse-datetime.h, not getdate.h. All calls
to get_date replaced with parse_datetime.
* src/misc.c (chdir_do): Don't use O_NOFOLLOW when opening the
argument to -C. This is for consistency with "tar -c -C FOO", and
matches the new documentation.
* tests/extrac14.at: New file.
* tests/Makefile.am (TESTSUITE_AT): Add it.
* tests/testsuite.at: Include it.
This closes another race condition, that occurs when overwriting a
symlink with a regular file.
* NEWS (--dereference consistency): New section.
* doc/tar.texi (Option Summary): Describe new --deference behavior.
(dereference): Likewise. Remove discussion that I didn't follow,
even before --dereference was changed.
* src/common.h (deref_stat, set_file_atime): Adjust signatures.
* src/compare.c (diff_file, diff_multivol): Respect open_read_flags
instead of rolling our own flags. This implements the new behavior
for --dereference.
(diff_file, diff_dumpdir): Likewise, for fstatat_flags.
* src/create.c: Adjust to set_file_atime signature change.
* src/extract.c (mark_after_links, file_newer_p, extract_dir):
Likewise.
* src/incremen.c (try_purge_directory): Likewise.
* src/misc.c (maybe_backup_file): Likewise.
* src/extract.c (file_newer_p): New arg STP. All callers changed.
(maybe_recoverable): New arg REGULAR. All callers changed.
Handle the case of overwriting a symlink with a regular file,
when --overwrite is specified but --dereference is not.
(open_output_file): Add O_CLOEXEC, O_NOCTTY, O_NONBLOCK for
consistency with file creation. Add O_NOFOLLOW if
overwriting_old_files && ! dereference_option.
* src/incremen.c (update_parent_directory): Use fstat, not fstatat;
there's less to go wrong.
* src/misc.c (deref_stat): Remove DEREF arg. All callers changed.
Instead, use fstatat_flags.
(set_file_atime): Remove ATFLAG arg. All callers changed.
Instead, use fstatat_flags.
* src/names.c, src/update.c: Adjust to deref_stat signature change.
* src/tar.c (get_date_or_file): Use stat, not deref_stat, as this
is not a file to be archived.
* tests/Makefile.am (TESTSUITE_AT): Add extrac13.at.
* tests/extrac13.at: New file.
* tests/testsuite.at: Include it.
Problem reported by Frantisek Hanzlik in
<https://bugzilla.redhat.com/635318> via Kamil Dudka in
<http://lists.gnu.org/archive/html/bug-tar/2010-09/msg00066.html>.
I don't understand this code either, but Sergey can take a look at
this patch, and perhaps install a better one, when he has the time.
* src/incremen.c (append_incremental_renames): Don't actually append
anything to DIR if DIR is null.
This change replaces traditional functions like 'open' with the
POSIX.1-2008 functions like 'openat'. Mostly this is an internal
refactoring change, in preparation for further changes to close
some races.
* gnulib.modules: Add faccessat, linkat, mkfifoat, renameat, symlinkat.
Remove save-cwd.
* src/Makefile.am (tar_LDADD): Add $(LIB_EACCESS).
* tests/Makefile.am (LDADD): Likewise.
* src/common.h (chdir_fd): New extern var.
* src/compare.c (diff_file, diff_multivol): Use openat instead of open.
* src/create.c (create_archive, restore_parent_fd): Likewise.
* src/extract.c (create_placeholder_file): Likewise.
* src/names.c (collect_and_sort_names): Likewise.
* src/update.c (append_file): Likewise.
* src/compare.c (diff_symlink): Use readlinkat instead of readlink.
* src/compare.c (diff_file): Use chdir_fd instead of AT_FDCWD.
* src/create.c (subfile_open, dump_file0): Likewise.
* src/extract.c (fd_chmod, fd_chown, fd_stat, set_stat):
(repair_delayed_set_stat, apply_nonancestor_delayed_set_stat):
Likewise.
* src/extract.c (mark_after_links, file_newer_p, extract_dir):
(extract_link, apply_delayed_links):
Use fstatat rather than stat or lstat.
* src/misc.c (maybe_backup_file, deref_stat): Likewise.
* src/extract.c (make_directories): Use mkdirat rather than mkdir.
Use faccessat rather than access. This fixes a minor permissions
bug when tar is running setuid (who would want to do that?!).
(open_output_file): Use openat rather than open.
In the process, this removes support for Masscomp's O_CTG files,
which aren't compatible with openat's signature. Masscomp! Wow!
That's a blast from the past. As far as I know, that operating
system hasn't been supported for more than 20 years.
(extract_link, apply_delayed_links):
Use linkat rather than link.
(extract_symlink, apply_delayed_links):
Use symlinkat rather than symlink.
(extract_node): Use mknodat rather than mknod.
(extract_fifo): Use mkfifoat rather than mkfifo.
(apply_delayed_links): Use unlinkat rather than unlink or rmdir.
* src/misc.c (safer_rmdir, remove_any_file): Likewise.
* src/unlink.c (flush_deferred_unlinks): Likewise.
* src/extract.c (rename_directory): Use renameat rather than rename.
* src/misc.c (maybe_backup_file, undo_last_backup): Likewise.
* src/misc.c: Don't include <save-cwd.h>; no longer needed now
that we're using openat etc.
(struct wd): Add member fd. Remove members err and fd. All uses
changed.
(CHDIR_CACHE_SIZE): New constant.
(wdcache, wdcache_count, chdir_fd): New vars.
(chdir_do): Use openat rather than save_cwd. Keep the cache up
to date. This code won't scale well, but is good enough for now.
* src/update.c (update_archive): Use openat + fdopendir +
streamsavedir rather than savedir.
This file is a placeholder. It will be replaced with the actual ChangeLog
by make dist. Run make ChangeLog if you wish to create it earlier.
* src/common.h (must_be_dot_or_slash): New decl.
* src/extract.c (mark_after_links): New function, taking code
that used to be in create_placeholder_file.
(create_placeholder_file): Use it.
(delay_set_stat): Always delay setting status for . and /.
* src/misc.c (must_be_dot_or_slash): Now extern.
* tests/extrac12.at: New file.
* tests/Makefile.am (TESTSUITE_AT): Add it.
* tests/testsuite.at: Likewise.
* NEWS: Describe symlink-extraction improvements.
* src/extract.c (enum permstatus): Remove.
(fchmod, fchown): Define dummy replacement macros if the system
does not supply them.
(implemented): New function.
(struct delayed_set_stat): Remove members invert_permissions,
permstatus. They were too confusing, and tried to do too much
in too-little space. Instead, add members current_mode,
current_mode_mask, interdir, atflag. All users changed.
(struct delayed_link): Add members mode, atime, mtime, to support
platforms such as BSD where symlinks have these attributes.
All users changed.
(fd_chmod): Renamed from fdchmod. New argument atflag. Check for
operation not supported at run-time, not at configure-time. Put
fd argument first. All callers changed.
(fd_chown): Likewise, renaming from fdchown.
(fd_stat): Likewise, renaming from fdstat.
(set_mode): Remove args stat_info, cur_info, invert_permissions,
permstatus. Add args mode, mode_mask, current_mode, current_mode_mask,
atflag. All callers changed. Close some races. Use an easier-to
understand method for computing permissions. Work around POSIX
incompatibility in Linux fchmodat. Support extraction of symlink
modes, if the OS allows it.
(set_stat): Remove args cur_info, invert_permissions, permstatus.
Add args current_mode, current_mode_mask, interdir, atflag.
All callers changed. Close some races. Support extraction of
attributes on symlinks, if the OS allows it.
(delay_set_stat): Remove args invert_permissions, permstatus.
Add args current_mode, current_mode_mask, mode, atflag.
The ST arg can be null now, indicating that it's an intermediate
directory. All callers changed.
(repair_delayed_set_stat, apply_nonancestor_delayed_set_stat):
Close some races.
(extract_dir): Also be paranoid if only --same-permissions, due
to semantics of setgid and setuid directories on some hosts.
This closes a race on those hosts. Simplify calculation of
delay_set_stat arguments; the old code was truly strange and
probably wrong in some border cases.
(extract_dir, extract_file, extract_node, extract_fifo): Don't rely on
unspecified behavior in mode arg of open, mknod, etc. Instead,
mask out those bits when creating the file, and add them later via
fchmod or chmodat.
(open_output_file): file_name is now const. Add arg current_mode,
current_mode_mask. All callers changed. When overwriting old files,
refuse to overwrite something that is not a regular file, since
we're extracting a regular file.
(extract_file): Remove the FIXME comment. Whatever the protection
issues were, they should be fixed now. As a result of all the other
API changes, we now use fchmod etc. rather than chmod etc., closing
some races.
(create_placeholder_file, apply_delayed_links): Record desired
mode and times for symlinks, for OSes that support that.
* src/extract.c (set_stat): Use UTIME_OMIT rather than UTIME_NOW.
The UTIME_NOW was there only to emulate the previous behavior of
using the current time, and the previous behavior was there only
because before we started assuming POSIX.1-2008 there was no
portable way to get the effect of UTIME_NOW.
This patch fixes a race condition in the --atime-preserve=replace
option, which might cause tar to improperly follow a symbolic link.
It also drops the use of the _FIOSATIME ioctl of Solaris 2.x
and later, which loses resolution on time stamps. Modern Solaris
systems support full-resolution time stamps in the kernel, and
it's not worth the hassle of testing this call, useful only in
no-longer-supported Solaris variants.
Also, it undoes a change I recently introduced to the --compare
option, which caused it to not follow symbolic links unless the
--dereference option was also used. Quite possibly this change is
a good idea, but the old behavior was documented and the change
should not have been installed casually.
* configure.ac: Don't check for stropts.h and sys/filio.h.
* gnulib.modules: Add futimens, utimensat. Remove futimens.
* src/common.h (fd_utimensat): New decl.
* src/compare.c (diff_file, diff_multivol):
Don't use open_read_flags: those are for --create only.
* src/create.c (dump_file0): Adjust to set_file_atime changes.
Pass fstatat_flags to set_file_atime, so that symbolic links are
not followed inadvertantly.
* src/extract.c: Don't include utimens.h.
(set_stat): Use fd_utimensat ant UTIME_NOW rather than fdutimens.
* src/misc.c: Don't include utimens.h, stropts.h, sys/filio.h.
(fd_utimensat): New function.
(set_file_atime): Use it. New arg atflag, controlling symlink
handling. All callers changed.
* configure.ac: Check for fchmod and fchown. Don't check for utimes.
* src/extract.c (fdchmod, fdchown, fdstat): New functions.
(set_mode, set_stat): New arg FD. All callers changed.
This avoids some race conditions between closing a regular file
and setting its metadata, and it's a bit faster.
* NEWS: Don't mention dirfd; no longer needed.
* gnulib.modules: Remove dirfd.
* src/create.c (get_directory_entries): Remove the code dealing
with dirfd failures, as the new fdopendir replacement doesn't
close its argument so we don't need to call dirfd. See
<http://lists.gnu.org/archive/html/bug-gnulib/2010-09/msg00208.html>
and gnulib commit 970c9038e4cca46e1b037ae0a6d574dfae6a7327.
* NEWS: Note the change. Mention dirfd and fdopendir.
* gnulib.modules: Add dirfd and fdopendir. The code was already
using fdopendir; dirfd is a new need.
* src/common.h (open_searchdir_flags, get_directory_entries):
(subfile_open, restore_parent_fd, tar_stat_close): New decls.
(check_exclusion_tags): Adjust signature to match code change.
* src/create.c (IMPOSTOR_ERRNO): New constant.
(check_exclusion_tags): First arg is now a struct tar_stat_info
const *, not an fd. All callers changed.
(dump_regular_file, dump_file0): A zero fd represents an unused
slot, so play it safe if the fd member is zero here. A negative
fd represents the negation of an errno value, so play it safe and
do not assign -1 to fd merely because an open fails.
(open_failure_recover, get_directory_entries, restore_parent_fd):
(subfile_open): New functions. These help to recover from file
descriptor exhaustion.
(dump_dir, dump_file0): Use them.
(dump_file0): Use tar_stat_close instead of rolling our own close.
* src/incremen.c (scan_directory): Use get_directory_entries,
subfile_open, etc., to recover from file descriptor exhaustion.
* src/names.c (add_hierarchy_to_namelist): Likewise.
(collect_and_sort_names): A negative fd represents the negation
of an errno value, so play it safe and do not assign -1 to fd.
* src/tar.c (decode_options): Set open_searchdir_flags.
Add O_CLOEXEC to all the open flags.
(tar_stat_close): New function, which knows how to deal with
new convention for directory streams and file descriptors.
Diagnose 'close' failures.
(tar_stat_destroy): Use it.
* src/tar.h (struct tar_stat_info): New member dirstream.
fd now has the negative of an errno value, not merely -1, if
the file could not be opened, so that failures to reopen directories
are better-diagnosed later.
* tests/Makefile.am (TESTSUITE_AT): Add extrac11.at.
* tests/testsuite.at: Likewise.
* tests/extrac11.at: New file.
