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* doc/coreutils.texi: `mkfifo' and `mknod' use the optContext macro
which adds a description for the SELinux security context in addition to
the single option already described in each case. The result in both
cases is two options being introduced as `option' (singular). Fix this
by introducing them as `options' (plural).
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Conditional jump or move depends on uninitialised value(s)
at 0x40380C: get_field_values (df.c:840)
by 0x403E16: get_dev (df.c:994)
by 0x404D65: get_all_entries (df.c:1364)
by 0x405926: main (df.c:1714)
* src/df.c (get_dev): Initialize the fsu.fsu_bavail_top_bit_set
member, when adding placeholder entries.
(main): Avoid a "definitely lost" memory leak warning from valgrind,
reported by Bernhard Voelker.
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* src/ls.c (usage): Add punctuation to avoid ambiguity in the
description of the --time option. Mention that both the -u
and --sort=time default order is newest first.
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* src/tail.c (tail_forever_inotify): Only monitor write()s and
truncate()s to files in --follow=descriptor mode, thus avoiding
the bug where we removed the watch on renamed files.
Also adjust the inotify event processing code that is
now significant only in --follow=name mode.
* tests/tail-2/F-vs-rename.sh: Improve this existing test by running
in both polling and inotify modes.
* tests/tail-2/f-vs-rename.sh: A new test based on the existing one.
* tests/local.mk: Reference the new test.
* NEWS: Mention the bug.
Fixes http://bugs.gnu.org/19760
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* doc/coreutils.texi: Move numfmt info to this section,
as numfmt functionality aligns more with seq and factor,
than fmt and pr etc.
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Problem reported by Isaac Schwabacher in:
http://bugs.gnu.org/20214
* doc/coreutils.texi (nohup invocation): Clarify that when nohup's
stdin gets redirected, it's unreadable.
* doc/coreutils.texi (nohup invocation):
* src/nohup.c (usage): Don't promise /dev/null.
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* tests/fs/skip-duplicates.sh: On this platform .mnt_opts is significant
so define to empty to avoid a NULL deref in read_file_system_list().
Fixes http://bugs.gnu.org/20210
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* src/ls.c (usage): Avoid the implication that the
default ls behavior is to --color=always.
Reported in http://bugs.debian.org/781208
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* src/date.c (usage): Use FMT rather than TIMESPEC as the parameter,
since it's simpler to understand and can be better aligned.
Give an example for the --iso-8601 output format.
Adjust the example used for the 3 standard formats to be unambiguous
with respect to day/mon ordering and use of leading zeros in the time.
Reorder the options descriptions slightly, so that the
3 standards options are together.
Indent the multi-line descriptions so that grouping is obvious.
Remove a redundant description of the --rfc-3339 format,
which is obvious in the existing example.
Separate these 3 standards options to their own translatable string
to simplify translation.
Change 'date and time' to 'date/time' in the --iso-8601 description
to be consistent with --rfc-3339 and to help avoid the implication
that the time is always output or even output by default.
Fixes http://bugs.gnu.org/20203
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* README-release: Reference http://www.gnu.org/s/coreutils/manual.css
to apply basic styling to the online coreutils manual, consistent
with the Emacs documentation.
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* src/uniq.c (usage): The description was very confusing in the man page
due to the stripped newlines. Add punctuation for clarification.
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* src/wc.c (wc): Allow any block to select the count implementation,
rather than just using the first 10 lines. This also simplifies
the code from 3 loops to 2.
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* src/ls.c (usage): Mention that default order is largest first.
Fixes http://bugs.gnu.org/20172
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* cfg.mk (sc_tests_executable): The previous commit avoided
the globbing, but also passed on the quoted wildcards to find(1).
We could use eval to handle the quoting, though that's a bit
awkward and dangerous, so instead explicitly disable globbing
for the whole make target subshell. Note noglob is not available
on solaris, where we fall back to set -f. Note also that zsh
uses set -F for this, but that's moot here. Also correct the
find(1) expression to include the -o between each wildcard.
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* cfg.mk (sc_tests_executable): If there are files with
$TEST_EXTENSIONS in the current directory, then the
lack of quoting of the $test_extensions_rx contents
could result in globbing and an inconsequential run.
find(1) produces warnings only with more than one expansion.
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Using a test file generated with:
yes | head -n100M > 2x100M.txt
before> time wc -l 2x100M.txt
real 0.842s
user 0.810s
sys 0.033s
after> time wc -l 2x100M.txt
real 0.142s
user 0.111s
sys 0.031s
* src/wc.c (wc): Split the loop that deals with -l into 3.
The first is used at the start of the input to determine if
the average line length is < 15, and if so the second loop is
used to look for '\n' internally to wc. For longer lines,
memchr is used as before to take advantage of system specific
optimizations which any outweigh function call overhead.
Note the first 2 loops could be combined, though in testing,
GCC 4.9.2 at least, wasn't sophisticated enough to separate
the loops based on the "check_len" invariant.
Note also __builtin_memchr() isn't significant here as
GCC currently only applies constant folding with that.
* NEWS: Mention the improvement.
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* src/yes.c (main): Even when the internal buffer isn't large enough,
output what we've buffered already, and interate over the rest.
This improves the performance in the edge case where there are
many small arguments that overflow the buffer.
* tests/misc/yes.sh: Add a test case for the many small arguments case.
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yes(1) may be used to generate repeating patterns of text
for test inputs etc., so adjust to be more efficient.
Profiling the case where yes(1) is outputting small items
through stdio (which was the default case), shows the overhead
of continuously processing small items in main() and in stdio:
$ yes >/dev/null & perf top -p $!
31.02% yes [.] main
27.36% libc-2.20.so [.] _IO_file_xsputn@@GLIBC_2.2.5
14.51% libc-2.20.so [.] fputs_unlocked
13.50% libc-2.20.so [.] strlen
10.66% libc-2.20.so [.] __GI___mempcpy
1.98% yes [.] fputs_unlocked@plta
Sending more data per stdio call improves the situation,
but still, there is significant stdio overhead due to memory copies,
and the repeated string length checking:
$ yes "`echo {1..1000}`" >/dev/null & perf top -p $!
42.26% libc-2.20.so [.] __GI___mempcpy
17.38% libc-2.20.so [.] strlen
5.21% [kernel] [k] __srcu_read_lock
4.58% [kernel] [k] __srcu_read_unlock
4.27% libc-2.20.so [.] _IO_file_xsputn@@GLIBC_2.2.5
2.50% libc-2.20.so [.] __GI___libc_write
2.45% [kernel] [k] system_call
2.40% [kernel] [k] system_call_after_swapgs
2.27% [kernel] [k] vfs_write
2.09% libc-2.20.so [.] _IO_do_write@@GLIBC_2.2.5
2.01% [kernel] [k] fsnotify
1.95% libc-2.20.so [.] _IO_file_write@@GLIBC_2.2.5
1.44% yes [.] main
We can avoid all stdio overhead by building up the buffer
_once_ and outputting that, and the profile below shows
the bottleneck moved to the kernel:
$ src/yes >/dev/null & perf top -p $!
15.42% [kernel] [k] __srcu_read_lock
12.98% [kernel] [k] __srcu_read_unlock
9.41% libc-2.20.so [.] __GI___libc_write
9.11% [kernel] [k] vfs_write
8.35% [kernel] [k] fsnotify
8.02% [kernel] [k] system_call
5.84% [kernel] [k] system_call_after_swapgs
4.54% [kernel] [k] __fget_light
3.98% [kernel] [k] sys_write
3.65% [kernel] [k] selinux_file_permission
3.44% [kernel] [k] rw_verify_area
2.94% [kernel] [k] __fsnotify_parent
2.76% [kernel] [k] security_file_permission
2.39% yes [.] main
2.17% [kernel] [k] __fdget_pos
2.13% [kernel] [k] sysret_check
0.81% [kernel] [k] write_null
0.36% yes [.] write@plt
Note this change also ensures that yes(1) will only write
complete lines for lines shorter than BUFSIZ.
* src/yes.c (main): Build up a BUFSIZ buffer of lines,
and output that, rather than having stdio process each item.
* tests/misc/yes.sh: Add a new test for various buffer sizes.
* tests/local.mk: Reference the new test.
Fixes http://bugs.gnu.org/20029
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In certain parallel build situations this would give the error:
help2man: can't get `--help' info from man/test.td/[
Makefile:14189: recipe for target 'man/test.1' failed
* man/local.mk (test.1): Depend on `[` rather than `test`,
as `test --help` outputs nothing. Also move dir.1 and vdir.1
back to the main list, as they're no more exceptions than
sha1sum etc.
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With "umask 0027" or even "umask 0077", the git clone of coreutils
does not have the executable bit set for 'other' (or 'group).
Therefore, "make syntax-check" would fail.
* cfg.mk (sc_tests_executable): Change the -perm argument of find(1)
to only print the names of the files which are not executable by the
user, rather than insisting on ugo+x (octal 111).
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* man/sync.x ([BUGS]): Mention the caveats and reference
the system call man pages for more details.
Fixes http://bugs.gnu.org/19995
Debian bug #507085 reported by jidanni@jidanni.org
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Adjust commit v8.23-140-gfdd6ebf to add the --output-error option
instead of --write-error, and treat open() errors like write() errors.
* doc/coreutils.texi (tee invocation): s/write-error/output-error/.
* src/tee.c (main): Exit on open() error if appropriate.
* tests/misc/tee.sh: Add a case to test open() errors.
* NEWS: Adjust for the more general output error behavior.
Suggested by Bernhard Voelker.
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* src/ls.c (color_indicator[C_END]): Comment with the correct
sequence, which was used since commit v6.10-61-g483297d
Fixes http://bugs.gnu.org/19992
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Note that IBRIX used to have a different magic number 0x013111A7
instead of the current 0x013111A8. However, the former is no longer
used and the version of IBRIX it was used in is really ancient, so
it's extremely unlikely anyone is still using it. Therefore, just
add the newer magic number.
Mark IBRIX as a 'remote' file system type as inotify support had
never been officially tested with it.
* src/stat.c (human_fstype): Add file system ID definition.
* NEWS: Mention the improvement.
Fixes http://bugs.gnu.org/19951
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tee is very often used with pipes and this gives better control
when writing to them. There are 3 classes of file descriptors
that tee can write to: files(1), pipes(2), and early close pipes(3).
Handling write errors to 1 & 2 is supported at present with the caveat
that failure writing to any pipe will terminate tee immediately.
Handling write errors to type 3 is not currently supported.
To improve the supported combinations we add these options:
--write-error=warn
Warn if error writing any output including pipes.
Allows continued writing to still open files/pipes.
Exit status is failure if any output had error.
--write-error=warn-nopipe, -p
Warn if error writing any output except pipes.
Allows continued writing to still open files/pipes.
Exit status is failure if any non pipe output had error.
--write-error=exit
Exit if error writing any output including pipes.
--write-error=exit-nopipe
Exit if error writing any output except pipes.
Use the "nopipe" variants when files are of types 1 and 3, otherwise
use the standard variants with types 1 and 2. A caveat with the above
scheme is that a combination of pipe types (2 & 3) is not supported
robustly. I.e. if you use the "nopipe" variants when using both type
2 and 3 pipes, then any "real" errors on type 2 pipes will not be
diagnosed.
Note also a general issue with type 3 pipes that are not on tee's
stdout, is that shell constructs don't allow to distinguish early
close from real failures. For example `tee >(head -n1) | grep -m1 ..`
can't distinguish between an error or an early close in "head" pipe,
while the fail on the grep part of the pipe is distinguished
independently from the resulting pipe errors. This is a general
issue with the >() construct, rather than with tee itself.
* NEWS: Mention the new feature.
* doc/coreutils.texi (tee invocation): Describe the new option.
* src/tee.c (usage): Likewise.
(main): With --write-error ignore SIGPIPE, and handle
the various exit, diagnostics combinations.
* tests/misc/tee.sh: Tess all the new options.
Fixes http://bugs.gnu.org/11540
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This is a cleanup to the previous commit v8.23-138-g7ceaf1d.
* src/tee.c (tee_files): Do not exempt the "-" file from being closed,
as this is no longer stdout but a normal file.
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Since v5.2.1-1247-g8dafbe5, tee(1) treated '-' as stdout while POSIX
explicitly requires to treat this as a file name. Revert this change,
as the interleaved output - due to sending another copy of input to
stdout - is not considered to be useful. Discussed in
http://lists.gnu.org/archive/html/coreutils/2015-02/msg00085.html
* src/tee.c (tee_files): Remove the special handling for "-" operands.
(usage): Remove the corresponding sentence.
* doc/coreutils.texi (common options): Remove the "tee -" example.
(tee invocation): Document that tee(1) now treats "-" as a file name.
* tests/misc/tee.sh: Add a test case for "tee -".
While at it, re-indent the above multi-argument processing case and
extend that to 13 operands, as POSIX mandates that, too.
* tests/misc/tee-dash.sh: Remove now-obsolete test.
* tests/local.mk (all_tests): Remove the above test.
* NEWS (Changes in behavior): Mention the change.
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* src/tee.c (main): Don't continue reading if we can't
output anywhere.
* tests/misc/tee.sh: Ensure we exit when no more outputs.
* NEWS: Mention the change in behavior.
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* tests/init.sh (returns_): Disable tracing for this wrapper
function, so that stderr of the wrapped command is unchanged,
allowing for verification of the contents.
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* cfg.mk (sc_prohibit_strncmp): Improve the search pattern: use
_sc_search_regexp to find all invocations of strncmp except when
used on a macro definition line; just match the function name with
an opening parenthesis. Before, the expression missed places where
the comparison against 0 was in a subsequent line.
* src/system.h (STRNCMP_LIT): Shorten 'literal' to 'lit' to move
the whole definition of the macro into one line - thus making
sc_prohibit_strncmp pass.
(STRPREFIX): Add space before parenthesis.
* src/du.c (main): Prefer STREQ_LEN over strncmp.
* src/pinky.c (scan_entries): Likewise.
* src/tac.c (tac_seekable): Likewise.
* src/who.c (scan_entries): Likewise.
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This setting is unusual on BSD as it's read normally in the local
flags returned by tcgetattr(), but can only be set with an ioctl.
Setting with tcsetattr() is ignored.
* src/stty.c (NO_SETATTR): A new flag to indicate the setting
is read and displayed like a normal termios flag, but is set
in some other manner.
(main): Skip tcsetattr() for this setting when this flag is set.
Also fixup the exiting 'extproc' processing to handle the
'-extproc' case correctly.
(sane_mode): Skip setting '-extproc' for 'sane' to avoid the error.
This isn't ideal but matches the operation of the BSD native stty.
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* .mailmap (jeff.liu@oracle.com): There are 3 different names in the
'git log' output for this email address; choose "Jeff Liu" as canonical
form.
(Алексей Шилин): Convert name to latin1 ("Aleksej Shilin")
to improve the sort order of the generated 'THANKS' file.
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At least 'sort' on openSUSE/Fedora have a bug in the case-folding code
of their I18N downstream patch which leads to wrong sort results,
e.g. "Dániel" coming after "Dylan".
* Makefile.am (THANKS): Sort the final contributor list using our
own sort implementation - as others may result in a different order;
add a FIXME comment to remove this again once common platforms have
a functional 'sort -f'. Add '-k1,1' for a better sort order.
While at it, save a grep and perl call to prepare the list from
'THANKS.in' by doing all in the first perl call.
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* cfg.mk (sc_long_lines): diff files are now completely excluded,
so no need to filter portions of them.
Reported by Bernhard Voelker.
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This includes a change to require --with-libmount
to be used with configure, due to the many libmount dependencies.
* bootstrap: Sync with gnulib to exit early on gnulib-tool error.
* gl/lib/tempname.c.diff: Adjust for gnulib changes.
* gl/lib/tempname.h.diff: Likewise.
* gl/modules/tempname: Likewise.
* doc/.gitignore: Add new gendocs_template_min gnulib script.
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* cfg.mk: Add .diff files to the exclusion expression
for sc_long_lines, since the gnulib code might be >= 80 chars.
Note 80 char lines trigger due to the added +/- diff marks.
Also normalize the $$ used in the other sc_long_lines exclusion
expressions.
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* src/ls.c (align_nstrftime): Be defensive and validate the tm_mon
index before using to access the abmon array. This was _not_ seen
to be an issue any system. See https://bugzilla.redhat.com/1190454
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* doc/coreutils.texi (Random sources): Give an example using openssl,
generating a reproducible arbitrary amount of randomly distributed
data, given a seed value.
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The construct "diff ... || diff=1 || diff=" does not set the variable
in all cases. This could be triggered with:
$ env make diff=1 make sc_dd_O_FLAGS
dd_O_FLAGS
maint.mk: ./src/dd.c has inconsistent O_ flag lists
cfg.mk:59: recipe for target 'sc_dd_O_FLAGS' failed
make: *** [sc_dd_O_FLAGS] Error 1
* cfg.mk (sc_dd_O_FLAGS): Remember $? of the diff command directly
and check its value later rather than using the above mentioned
mapping.
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The previous commit v8.23-124-g7b1ca5f made the above syntax-check rule
fail, because that took the whole content of THANKS.in for comparison.
* cfg.mk (sc_THANKS_in_duplicates): Strip off the header (all before the
first empty line) and the footer (all past the next empty line) from
'THANKS.in' for the check.
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* THANKS.in: Document the preferred sort order as a comment
at the top of the file. Change "Марк Коренберг" to latin1
("Mark Korenberg"). Sort all entries.
* cfg.mk (sc_THANKS_in_sorted): Add rule to ensure that
'THANKS.in' remains sorted.
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* src/tail.c (main): Document another caveat with the
inotify implementation wrt multiple hardlinked files.
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Each user has a maximum number of inotify watches,
so handle the cases where we exhaust these resources.
* src/tail.c (tail_forever_inotify): Ensure we inotify_rm_watch()
the watch for an inode, when replacing with a new watch for a name.
Return all used inotify resources when reverting to polling.
Revert to polling upon first indication of inotify resource exhaustion.
Revert to polling on any inotify resource exhaustion.
Diagnose resource exhaustion correctly in all cases.
Avoid redundant reinsertion in the hash for unchanged watches
(where only attributes of the file are changed).
* tests/tail-2/retry.sh: Avoid false failure when reverting to polling.
* tests/tail-2/inotify-rotate.sh: Likewise.
* tests/tail-2/symlink.sh: Likewise.
* tests/tail-2/inotify-rotate-resources.sh: New test to check
that we're calling inotify_rm_watch() for replaced files.
* tests/local.mk: Reference the new test.
* NEWS: Mention the bug fix.
* THANKS.in: Thanks for reporting and problem identification.
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* tests/tail-2/inotify-rotate.sh (cleanup_fail_): Set fail=1
so that failures are identified. Regression in v8.23-63-g111a2b9
Also use print_ver_ rather than open coding --verbose support.
Also check for more than a single 'b' which seems brittle.
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The -fsanitize=address run associated with v8.22-75-gf940fec
failed to check make-prime-list, as src/primes.h is not
regenerated with `make clean`. Running with -fsanitize=address
indicates a read 1 byte beyond the allocated buffer.
$ rm src/make-prime-list.o
$ make AM_CFLAGS=-fsanitize=address src/make-prime-list
$ src/make-prime-list 5000
=================================================================
==13913==ERROR: AddressSanitizer: heap-buffer-overflow on address
0x61e00000fa43 at pc 0x4016f5 bp 0x7fff9d9840e0 sp 0x7fff9d9840d0
READ of size 1 at 0x61e00000fa43 thread T0
#0 0x4016f4 in main src/make-prime-list.c:214
#1 0x7f98892c5fdf in __libc_start_main (/lib64/libc.so.6+0x1ffdf)
#2 0x401774 (src/make-prime-list+0x401774)
0x61e00000fa43 is located 0 bytes to the right of 2499-byte
region [0x61e00000f080,0x61e00000fa43) allocated by thread T0 here:
#0 0x7f98896ba7b7 in malloc (/lib64/libasan.so.1+0x577b7)
#1 0x400f3f in xalloc src/make-prime-list.c:163
#2 0x400f3f in main src/make-prime-list.c:198
SUMMARY: AddressSanitizer: heap-buffer-overflow
src/make-prime-list.c:214 main
Shadow bytes around the buggy address:
0x0c3c7fff9ef0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c3c7fff9f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c3c7fff9f10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c3c7fff9f20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c3c7fff9f30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c3c7fff9f40: 00 00 00 00 00 00 00 00[03]fa fa fa fa fa fa fa
0x0c3c7fff9f50: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c3c7fff9f60: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c3c7fff9f70: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c3c7fff9f80: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c3c7fff9f90: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
Shadow byte legend (one shadow byte represents 8 application bytes):
Addressable: 00
Partially addressable: 01 02 03 04 05 06 07
Heap left redzone: fa
...
==13913==ABORTING
* src/make-prime-list.c (main): Bounds check the incremented index,
before using to access the buffer.
Fixes http://bugs.gnu.org/19784
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* gl/lib/tempname.c.diff: Fix recent breakage so it applies again.
Invalid patch was noticed at http://hydra.nixos.org/eval/1172233
* cfg.mk: Exempt diff files from these "id_est" syntax checks.
(sc_ensure_gl_diffs_apply): A new syntax check, to ensure all
patches under gl/ apply cleanly. Note we use --fuzz=0 to check
patches apply cleanly for safety, due to the patch(1) issue detailed
in commit v8.21-117-g46f7e05
* gl/lib/regcomp.c.diff: Rediffed.
* gl/lib/regex_internal.c.diff: Likewise.
* gl/lib/regex_internal.h.diff: Likewise.
* gl/lib/regexec.c.diff: Likewise.
* gl/lib/tempname.h.diff: Likewise.
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The following test fails on aarch64 on openSUSE's OpenBuildService
due to glibc's execvp reversing the pointers of 'environ', i.e.,
the output of "env|tac" equals "env env" on that platform.
* tests/misc/printenv.sh: Use 'env env' to work around the behavior
on that platform.
While at it, fix the grep pattern which suppressed all environment
variables starting with an underscore "_" instead of "$_" (and
"$LD_PRELOAD") only.
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* src/dircolors.hin: Remove deprecated anx, axa, axv. Add opus.
Suggested by Scott Teal.
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To align with all other places (and correct grammar), change all
upper-case "I.E." to "I.e.". Furthermore, ensure that "i.e." is
followed by a comma. Finally, ensure to use a double-space before
"I.e.," at the beginning of a sentence.
The following was used to change all offending uses (apart from
old ChangeLog files):
$ git grep -liF 'i.e.' \
| xargs sed -i \
-e 's/I\.E\./I.e./g' \
-e 's/\. \(I\.e\.\)/. \1/g' \
-e 's/\([Ii]\.e\.\)\( \)/\1,\2/g' \
-e 's/\([Ii]\.e\.\)$/\1,/g'
* cfg.mk (sc_prohibit_uppercase_id_est): Add new rule.
(sc_ensure_double_space_after_dot_before_id_est): Likewise.
(sc_ensure_comma_after_id_est): Likewise.
(old_NEWS_hash): Refresh hash via "make update-NEWS-hash".
* NEWS: Change use of "id est" abbreviation via the above command.
* README: Likewise.
* README-prereq: Likewise.
* doc/coreutils.texi: Likewise.
* gl/lib/rand-isaac.c: Likewise.
* gl/lib/tempname.c.diff: Likewise.
* man/stdbuf.x: Likewise.
* src/cat.c: Likewise.
* src/copy.c: Likewise.
* src/copy.h: Likewise.
* src/cp.c: Likewise.
* src/cut.c: Likewise.
* src/dd.c: Likewise.
* src/df.c: Likewise.
* src/fiemap.h: Likewise.
* src/longlong.h: Likewise.
* src/ls.c: Likewise.
* src/numfmt.c: Likewise.
* src/pr.c: Likewise.
* src/shred.c: Likewise.
* src/shuf.c: Likewise.
* src/split.c: Likewise.
* tests/Coreutils.pm: Likewise.
* tests/df/df-symlink.sh: Likewise.
* tests/df/skip-rootfs.sh: Likewise.
* tests/init.sh: Likewise.
* tests/ls/color-norm.sh: Likewise.
* tests/misc/basename.pl: Likewise.
* tests/misc/ls-misc.pl: Likewise.
* tests/misc/md5sum-bsd.sh: Likewise.
* tests/misc/shred-exact.sh: Likewise.
* tests/misc/sort.pl: Likewise.
* tests/misc/stdbuf.sh: Likewise.
* tests/misc/tac-continue.sh: Likewise.
* tests/rm/r-root.sh: Likewise.
* tests/tail-2/symlink.sh: Likewise.
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* src/md5sum.c (usage): Detail the reasons for the default
double space between checksum and file name.
* doc/coreutils.texi (md5sum invocation): Likewise.
Explicitly mention the 3 formats that --check supports.
Fixes http://bugs.gnu.org/19725
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