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* src/md5sum.c (digest_check): Update a matched_checksums bool upon
matched checksum, and fail (loudly unless --status is specified)
if there were no matches. Also change properly_formatted_lines
to a bool while at it since we don't need to track the plurality.
* tests/misc/md5sum.pl: Add a test case.
Suggested by Jim Meyering.
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* doc/coreutils.texi (md5sum invocation): Document the new option.
* src/md5sum.c (digest_file): Return an empty digest to indicate
a missing file.
(digest_check): Don't fail or output status given an empty checksum.
(usage): Document the new option.
(main): Process and validate the new option.
* tests/misc/md5sum.pl: Add new test cases.
* NEWS: Mention the new feature.
Fixes http://bugs.gnu.org/15604
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discussed in:
http://lists.gnu.org/archive/html/coreutils/2015-10/msg00091.html
* src/csplit.c: (save_line_to_file): check fwrite failures, report
and exit immediately instead of deferring to 'close_output'.
* tests/misc/csplit-io-err.sh: test fwrite failure using LD_PRELOAD.
* tests/local.mk: add new test.
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programs may not be built due to missing system dependencies,
or any program can be excluded at configure time with
--enable-no-install-program. So ensure we're not testing the
system versions in these cases.
* init.cfg (print_ver_): Call require_built_ first.
* tests/misc/tty-eof.pl: Skip programs not built.
* tests/Coreutils.pm (run_tests): Likewise.
* tests/misc/ls-misc.pl: Use 'env test' rather than abs path.
* tests/misc/test-diag.pl: Likewise.
* tests/local.mk: Adjust include order for dependencies.
* tests/misc/arch.sh: Remove redundant calls to require_built_.
* tests/misc/chroot-fail.sh: Likewise.
* tests/misc/groups-dash.sh: Likewise.
* tests/misc/groups-version.sh: Likewise.
* tests/misc/stdbuf.sh: Likewise.
* tests/cp/acl.sh: Remove problematic call to print_ver_ [gs]etfacl.
* tests/mv/acl.sh: Likewise.
* cfg.mk (sc_env_test_dependencies): A new syntax check to enforce
specifying dependencies with print_ver_ for programs
specified through the env command.
* du/bigtime.sh: Add new print_ver_ dependencies.
* du/max-depth.sh: Likewise.
* dd/ascii.sh: Likewise.
* tests/ls/capability.sh: Likewise.
* tests/ls/root-rel-symlink-color.sh: Likewise.
* tests/misc/chroot-fail.sh: Likewise.
* tests/misc/readlink-fp-loop.sh: Likewise.
* tests/misc/sort-debug-keys.sh: Likewise.
* tests/readlink/can-e.sh: Likewise.
* tests/readlink/can-f.sh: Likewise.
* tests/readlink/can-m.sh: Likewise.
* tests/tail-2/inotify-race.sh: Likewise.
* tests/tail-2/inotify-race2.sh: Likewise.
* tests/touch/no-create-missing.sh: Likewise.
* tests/touch/no-dereference.sh: Likewise.
* tests/misc/printenv.sh: Tweak to avoid syntax check trigger.
* tests/misc/help-version.sh: Likewise.
* tests/misc/yes.sh: Likewise.
* tests/misc/printf-quote.sh: Use previously unused $prog.
* configure.ac (EXTRA_MANS): Add $gl_no_install_prog to the list
so that check-x-vs-1 syntax check is satisfied.
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It's better to be consistent even though spacing is insignificant:
http://www.in-ulm.de/~mascheck/various/shebang/#blankrequired
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A side effect of this cleanup is we no longer
depend on our own kill command being built.
* init.cfg (require_trap_signame_): A new function to verify
that the shell supports specifying traps by signal name.
(require_kill_group_): A new function to ensure the shell
supports sending a signal to a group.
* tests/du/move-dir-while-traversing.sh: Ensure trap supports
signal names.
* tests/misc/stty-invalid.sh: Likewise.
* tests/misc/stty-pairs.sh: Likewise.
* tests/misc/stty-row-col.sh: Likewise.
* tests/misc/stty.sh: Likewise.
* tests/misc/sort-compress.sh: Likewise. Also simplify trap call.
* tests/install/trap.sh: Likewise.
* tests/misc/timeout.sh: Likewise.
* tests/dd/stats.sh: Likewise. Also use default kill command.
* tests/misc/timeout-group.sh: Likewise.
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* src/paste.c (main): Setting the quoting style to "escape"
went against the intent of the comment about presenting
doubled backslashes to the user. Instead use "c-maybe"
which is the only mode which avoids doubled backslashes,
and provides protection against arbitrary control characters.
* tests/misc/paste.pl: Adjust accordingly.
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* src/printf.c (usage): Mention the new format.
(print_formatted): Handle the quoting by calling
out to the quotearg module with "shell-escape" mode.
* doc/coreutils.texi (printf invocation): Document %q.
* tests/misc/printf-quote.sh: New test.
* tests/local.mk: Reference new test.
* NEWS: Mention the new feature.
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This is mainly noticeable when the multi-byte code
within ls.c is triggered by multi-byte quotes.
$ seq 200000 | xargs touch
$ time ls-old -U --quoting=locale --hide-control-chars >/dev/null
real 0m0.483s
$ time ls-new -U --quoting=locale --hide-control-chars >/dev/null
real 0m0.430s
* src/ls.c (quote_name): Avoid rescanning the output looking for
unprintable chars when we know the quoting mode already escapes them.
* tests/misc/ls-misc.pl: Add tests for all quoting modes, with and
without -q, to verify this assumption.
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* doc/coreutils.texi (ls invocation): Describe the new
'shell-escape' and 'shell-escape-always' quoting options.
* src/ls.c (usage): Mention the new quoting options.
* tests/misc/ls-misc.pl: Add a test for 'shell-escape'
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Quote file names using the "shell-escape" or "shell-escape-always"
methods, which quote as appropriate for most shells,
and better support copy and paste of presented names.
The "always" variant is used when the file name is
embedded in an error message with surrounding spaces.
* cfg.mk (sc_error_shell_quotes): A new syntax check rule
to suggest quotef() where appropriate.
(sc_error_shell_always_quotes): Likewise for quoteaf().
* src/system.h (quotef): A new define to apply shell quoting
when needed. I.E. when shell character or ':' is present.
(quoteaf): Likewise, but always quote.
* src/*.c: Use quotef() and quoteaf() rather than quote()
where appropriate.
* tests/: Adjust accordingly.
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* src/md5sum.c: Use the same file name escaping method used
when generating and checking checksums. I.E. ensure a single line
per file by starting the line with '\' for any file name containing '\n'
and replacing those with "\\n".
* NEWS: Move the item from changes in behavior to improvements,
since this is no longer a backwards incompat change when
processing stdout status messages.
* tests/misc/md5sum.pl: Remove quotes from expected status output.
* tests/misc/sha1sum.pl: Likewise.
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Related to commit v8.24-61-g6796698 this provides
more consistent quoting, as quotearg_colon() defaults
to "literal" quoting by default, while quote()
provides appropriate quoting for diagnostics by default.
* gl/modules/randread: Depend on quote module rather than quotearg.
* gl/lib/randread.c: Used quote() not quotearg_colon().
* src/: Likewise.
* src/shred.c: Likewise. Also avoid unnecessary quoting
introducing overhead when wiping names.
* cfg.mk: Relax the matching expression to allow
"qname" variables as used in shred.c to satisfy the check.
* tests/: Adjust accordingly.
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* src/date.c (main): Use %:z rather than %z with --iso-8601
as the standard states to consistently use extended format.
Note either format can be parsed by date.
* tests/misc/date.pl: Adjust accordingly.
* doc/coreutils.texi (du invocation): Clarify that "iso"
time styles are only similar to ISO-8601.
(ls invocation): Likewise.
(date invocation): Adjust the comment stating
that only --rfc-3339 output can be parsed by date(1).
* NEWS: Mention the change in behavior.
Reported at http://bugs.debian.org/799479
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These strings are often file names or other user specified
parameters, which can give confusing errors in
the presence of unexpected characters for example.
* cfg.mk (sc_error_quotes): A new syntax check rule.
* src/*.c: Wrap error() string arguments with quote().
* tests/: Adjust accordingly.
* NEWS: Mention the improvement.
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This is especially significant when using --check
with files generated on a windows system, where the \r
characters produce corrupted and confusing error messages.
This also ensures status messages are output on a single line.
* src/md5sum.c: Use quote() for printed file names.
* tests/misc/md5sum.pl: Adjust accordingly.
* NEWS: Mention the change in behavior.
Fixes http://bugs.gnu.org/21757
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* tests/misc/csplit-heap.sh: A little more memory is required
for the full run case. Noticed with --enable-single-binary.
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* src/dircolors.c (dc_parse_stream): Support globbing of
TERM entries, to allow entries like "TERM *256color*" for example.
* src/dircolors.hin: Reduce the internal list with globbing.
* tests/misc/dircolors.pl: New test cases.
* NEWS: Mention the improvement.
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* tests/misc/sort-compress-hang.sh: Use --foreground with the
timeout(1) command (noting the caveats), to run the sort command
in the foreground program group, and thus be responsive to Ctrl-C.
This very_expensive_ test takes over a minute on a i3-2310M,
with RAM backed /tmp.
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* tests/dd/no-allocate.sh: Account for timeout(1) when
determining the required mem, as timeout has additional shared libs.
This avoids the need for the hardcoded 4M addition to the limit.
* tests/misc/head-c.sh: Increase the base limit, to account for
the fact that head(1) will allocate some additional mem in this case.
* tests/misc/cut-huge-range.sh: Remove mention of specific limits.
* tests/misc/printf-surprise.sh: Likewise.
Reported by Dmitry V. Levin
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* src/csplit.c (usage): -m is not accepted, only --suppress-matched.
* tests/misc/csplit-suppress-matched.pl: Spelling fix.
Reported by Ondrej Oprala
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When configured with either 'symlinks' or 'shebangs' as value for
the --enable-single-binary option, tests based on `ulimit -v` are
skipped. The reason is that the multicall 'coreutils' binary requires
much more memory due to shared libraries being loaded, and the size of
the 'date' binary (~290KiB) compared to the multicall binary (~5MiB),
of course. Finally, in the case of 'shebangs', the starting shell
requires more memory, too
Instead of using hard-coded values for the memory limit, use an
adaptive approach: first determine the amount of memory for a similar,
yet more trivial invocation of the command, and then do the real test
run using that limit (plus some buffer in some cases).
* init.cfg (require_ulimit_v_): Remove function.
(get_min_ulimit_v_): Add function to determine the minimum memory limit
required for a given command in an adaptive way.
* cfg.mk (sc_prohibit_test_ulimit_without_require_): Change the name
of the above function in the syntax-check rule.
* tests/cp/link-heap.sh: Use the above function to determine the
minimum memory required to run a command simpler than in the real test
run. Use that limit plus a buffer there. While at it, change to list
of commands in the subshell to fail also if the beginning `ulimit -v`
fails.
* tests/dd/no-allocate.sh: Likewise.
* tests/misc/csplit-heap.sh: Likewise.
* tests/misc/cut-huge-range.sh: Likewise.
* tests/misc/head-c.sh: Likewise.
* tests/misc/printf-surprise.sh: Likewise.
* tests/split/line-bytes.sh: Likewise.
* tests/rm/many-dir-entries-vs-OOM.sh: Likewise - doing it separately
for each program under test.
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* src/sort.c (main): With --debug, warn upon setlocale() failure,
which can happen due to incorrectly specified environment variables,
or due to memory exhaustion (simulated with ulimit -v), etc.
* tests/misc/sort-debug-warn.sh: Add a test case.
See also http://savannah.gnu.org/bugs/11004
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numfmt --field=LIST can accept the same options as cut.
* bootstrap.conf: remove xlist, linked-list
* src/local.mk: link numfmt with set-fields
* src/numfmt.c: use set-fields.c instead of custom field parsing code.
(include_field): adapt to new code.
* tests/misc/numfmt.pl: add new tests, adapt current tests to new
error message wording from set-fields.c
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Extract the functionality of parsing --field=LIST into a separate
module, to be used by other programs.
* src/cut.c: move field parsing code from here ...
* src/set-fields.{c,h}: ... to here.
(set_fields): generalize by supporting multiple parsing/reporting
options.
(struct range_pair): rename to field_range_pair.
* src/local.mk: link cut with set-field.
* po/POTFILES.in: add set-field.c
* tests/misc/cut.pl: update wording of error messages
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* tests/misc/tty-eof.pl: Add numfmt to the list of programs
that accept input on stdin.
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* src/base64.c (main): Support decimal numbers with leading zeros,
by disabling the auto detection of octal and hex. It's not
envisaged that base conversion is needed for --wrap parameters,
and in the edge case it is, $((0x0)) shell constructs can be used.
* tests/misc/base64.pl: Adjust accordingly.
* NEWS: Mention the change in behavior.
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* src/base64.c (main): Use the higher level xnumtoumax()
rather than xstrtoumax(), which is simpler and improves
validation of input. Also pass the _empty_ rather than NULL
string as the suffixes parameter so that invalid trailing
characters are not allowed. For example -w08 is now
flagged as an error, rather than being interpreted as 0.
A subsequent commit will further improve verification
of numbers with leading zeros by dropping backwards compatibility
wrt auto parsing oct and hex numbers.
* tests/misc/base64.pl: Add tests for invalid wrap values.
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Suggested in https://bugzilla.redhat.com/1250113
* AUTHORS: Add base32.
* THANKS.in: Add suggester.
* README: Reference the new program.
* NEWS: Mention the new program.
* src/.gitignore: Ignore the new binary.
* bootstrap.conf: Reference the gnulib base32 module.
* build-aux/gen-lists-of-programs.sh: Add base32.
* man/base32.x: A new template.
* man/.gitignore: Ignore the new man page.
* man/local.mk: Reference the new man page.
* doc/coreutils.texi (base32 invocation): Document the new command.
* src/local.mk: Adjust to build base32 based on base64.c.
* src/base64.c: Parameterize to use the correct headers,
functions and buffer sizes, depending on which binary
is being built.
* tests/misc/base64.pl: Adjust to test both base32 and base64.
* tests/misc/tty-eof.pl: Add base32 as a program that
accepts input on stdin without any options specified.
* scripts/git-hooks/commit-msg: Add base32 to the template.
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This was detected in about 25% of runs with gcc -fsanitize=address
ERROR: AddressSanitizer: global-buffer-overflow on address ...
READ of size 4 at 0x000000416628 thread T0
#0 0x40479f in genpattern src/shred.c:782
#1 0x4050d9 in do_wipefd src/shred.c:921
#2 0x406203 in wipefile src/shred.c:1175
#3 0x406b84 in main src/shred.c:1316
#4 0x7f3454a1ef9f in __libc_start_main (/lib64/libc.so.6+0x1ff9f)
#5 0x4025d8 (/tmp/coreutils-8.23/src/shred+0x4025d8)
0x000000416628 is located 56 bytes to the left of
global variable '*.LC49' from 'src/shred.c' (0x416660) of size 17
0x000000416628 is located 12 bytes to the right of
global variable 'patterns' from 'src/shred.c' (0x416540) of size 220
SUMMARY: AddressSanitizer: global-buffer-overflow src/shred.c:782
* src/shred.c (gen_patterns): Restrict pattern selection
to the K available, which regressed due to v5.92-1462-g65533e1.
* tests/misc/shred-passes.sh: Add a deterministic test case.
* NEWS: Mention the bug fix.
Fixes http://bugs.gnu.org/20998
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Since non interactive shells don't generally set $SHELL,
its value is propagated through the tests and may cause issues;
for example if $SHELL implicitly adjusts $PATH when run.
Instead we set $SHELL to that determined by the posix-shell module,
and use that consistently for all test sub scripts,
including those created thorugh the `split --filter` command.
* tests/local.mk: Explicitly set $SHELL to $(PREFERABLY_POSIX_SHELL)
which defaults to $CONFIG_SHELL and thus usually /bin/sh.
* tests/envvar-check: Remove bash environment variables with
side effects, in case /bin/bash was selected for $SHELL.
* tests/misc/help-version.sh: Remove redundant initialization of $SHELL.
* tests/install/strip-program.sh: Use $SHELL for sub script.
* tests/misc/sort-compress-hang.sh: Likewise.
* tests/misc/sort-compress-proc.sh: Likewise.
* tests/misc/sort-compress.sh: Likewise.
* tests/misc/timeout-group.sh: Likewise.
* tests/rm/fail-eperm.xpl: Remove redundant elision of bash env vars.
* tests/misc/pwd-long.sh: Likewise.
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* tests/du/threshold.sh: Homogenize getopt error messages.
* tests/misc/numfmt.pl: Likewise.
* tests/mv/i-3.sh: Skip on *BSD not just FreeBSD.
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* tests/misc/stty.sh: FreeBSD returns ENOTTY for
the TIOCEXT ioctl, so just avoid this option for now.
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* tests/misc/sync.sh: Ensure dir is unreadable before
including the permission check.
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* src/factor.c (n_out): A new global variable to track
how much data has been written to stdout.
(print_factors_single): Use n_out to determine whether
to flush the current (and previous) lines.
* tests/misc/factor-parallel.sh: Add a new test.
* tests/local.mk: Reference the new test.
* NEWS: Mention the bug fix.
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src/seq.c (scan_arg): Set precision and width _after_ exponentiation.
For example, this will make '1.1e1 12' and '11 1.2e1' equivalent.
One can still set the precision by specifying extra precision on
the start value, or more naturally with a precision on a step value.
* tests/misc/seq-precision.sh: Add new cases.
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* src/seq.c (scan_arg): Set precision to 0 for hex constants
(while avoiding hex floats). This will use then use the
fast path for these arguments. Note we also set the precision
of inf to 0 here, which ensures we use consistent precision
on output where possible.
* tests/misc/seq-precision.sh: Add corresponding test cases.
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* src/seq.c (main): Call seq_fast for infinite last value.
This implicitly avoids format conversion on the
999999 -> 1000000 transition.
* src/seq.c (seq_fast): Generalize the buffer handling,
and adjust to handle the "inf" last value specifics.
* tests/misc/seq-precision.sh: A new test.
* tests/local.mk: Reference the new test.
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* src/numfmt.c (MAX_UNSCALED_DIGITS): Set this to LDBL_DIG
rather than hardcoding at 18 for better portability.
* tests/misc/numfmt.pl: Restrict limit tests to supported platforms.
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* src/numfmt.c (simple_strtod_int): Don't count leading zeros
as significant digits. Also have leading zeros as optional
for floating point numbers.
* tests/misc/numfmt.pl: Add test cases.
* NEWS: Mention the fix.
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Due to existing limits this is usually triggered
with an increased precision. We also add further
restrictions to the output of increased precision numbers.
* src/numfmt.c (simple_round): Avoid intmax_t overflow.
(simple_strtod_int): Count digits consistently
for precision loss and overflow detection.
(prepare_padded_number): Include the precision
when excluding numbers to output, since the precision
determines the ultimate values used in the rounding scheme
in double_to_human().
* tests/misc/numfmt.pl: Add previously failing test cases.
* NEWS: Mention the fix.
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* src/numfmt.c (usage): Update the --format description
to indicate precision is allowed.
(parse_format_string): Parse a precision specification
like the standard printf does.
(double_to_human): Honor the precision in --to mode.
* tests/misc/numfmt.pl: New tests.
* doc/coreutils.texi (numfmt invocation): Mention the new feature.
* NEWS: Likewise.
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* src/numfmt.c: Replace field handling code with logic that understands
field range specifiers. Instead of processing a single field and
printing line prefix/suffix around it, process each field in the line
checking whether it has been included for conversion. If so convert and
print, otherwise just print the unaltered field.
(extract_fields): Removed.
(skip_fields): Removed.
(process_line): Gutted and heavily reworked.
(process_suffixed_number): FIELD is now passed as an arg instead of
using a global.
(parse_field_arg): New function that parses field range specifiers.
(next_field): New function that returns pointers to the next field in
a line.
(process_field): New function that wraps the field conversion logic
(include_field): New function that checks whether a field should be
converted
(compare_field): New function used for field value comparisons in a
gl_list.
(free_field): New function used for freeing field values in a gl_list.
Global variable FIELD removed.
New global variable all_fields indicates whether all fields should be
processed.
New global variable all_fields_after stores the first field of a N-
style range.
New global variable all_fields_before stores the last field of a -M
style range.
New global variable field_list stores explicitly specified fields to
process (N N,M or N-M style specifiers).
(usage): Document newly supported field range specifiers.
* bootstrap.conf: Include xlist and linked-list modules. numfmt now
uses the gl_linked_list implementation to store the field ranges.
* tests/misc/numfmt.pl: Add tests for 'cut style' field ranges.
Adjust existing tests as partial output can occur before an error
Remove test for the 'invalid' field -5.. this is now a valid range.
* gnulib: update to avoid compiler warnings in linked-list.
* NEWS: Mention the new feature.
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* src/numfmt.c (unit_to_umax): Support SI (power of 10) suffixes
with the --from-unit and --to-unit options. Treat suffixes like
is done with --from=auto, which for example will change the meaning
of --to-unit=G to that of --to-unit=Gi. The suffix support was
previously undocumented and it's better to avoid the traditional
coreutils suffix handling in numfmt by default.
* doc/coreutils.texi: Document the new behavior. Also fix a typo
mentioning {from,to}=units=.
* tests/misc/numfmt.pl: Adjust accordingly.
* NEWS: Mention the change in behavior.
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* configure.ac: Comment on why we link rather than run the test,
and remove the moot __ELF__ check since we never ran it anyway,
and the new CFLAGS and LDFLAGS are a more direct test of support.
* tests/misc/wc-parallel.sh: Fix a syntax error in the previous change.
* tests/misc/md5sum-parallel.sh: Use better error checking, consistent
with that used in wc-parallel.sh.
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Problems reported by Michael Felt, and and part of this fix taken
from code suggested by Pádraig Brady in:
http://bugs.gnu.org/20733#112
* configure.ac (stdbuf_supported): Check for warnings, and
for -fPIC and -shared, for AIX.
* src/stat.c (STRUCT_STATVFS): Define to struct statvfs64 if
STATFS is statvfs64.
* src/sync.c (sync_arg) [_AIX]: Open in write mode,
since AIX fsync doesn't work on read-only file descriptors.
* tests/misc/wc-parallel.sh: Skip test if xargs -P does not work.
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* tests/misc/uniq-perf.sh: Use our standard 10s timeout,
which is sufficient to trigger the failure and also
avoids a false failure on slow/loaded systems.
Noticed at http://hydra.nixos.org/build/22766288
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Reap background processes so that:
- Stray processes aren't left on the system
- Files aren't held open causing deletion issues on NFS
- Partitions used to run the tests from can be unmounted
* tests/tail-2/F-vs-missing.sh: Add the `kill && wait` of the
background $pid(s) to cleanup_().
* tests/tail-2/F-vs-rename.sh: Likewise.
* tests/tail-2/f-vs-rename.sh: Likewise.
* tests/tail-2/append-only.sh: Likewise.
* tests/tail-2/assert-2.sh: Likewise.
* tests/tail-2/assert.sh: Likewise.
* tests/tail-2/flush-initial.sh: Likewise.
* tests/tail-2/inotify-hash-abuse.sh: Likewise.
* tests/tail-2/inotify-hash-abuse2.sh: Likewise.
* tests/tail-2/inotify-race.sh: Likewise.
* tests/tail-2/inotify-rotate-resources.sh: Likewise.
* tests/tail-2/inotify-rotate.sh: Likewise.
* tests/tail-2/pid.sh: Likewise.
* tests/tail-2/pipe-f2.sh: Likewise.
* tests/tail-2/retry.sh: Likewise.
* tests/tail-2/symlink.sh: Likewise.
* tests/tail-2/tail-n0f.sh: Likewise.
* tests/tail-2/wait.sh: Likewise.
* tests/cp/existing-perm-race.sh: Likewise.
* tests/cp/file-perm-race.sh: Likewise.
* tests/cp/parent-perm-race.sh: Likewise.
* tests/cp/sparse-to-pipe.sh: Likewise.
* tests/dd/stats.sh: Likewise.
* tests/du/move-dir-while-traversing.sh: Likewise.
* tests/misc/cat-buf.sh: Likewise.
* tests/misc/help-version.sh: Likewise.
* tests/misc/printf-surprise.sh: Likewise.
* tests/misc/sort-compress-proc.sh: Likewise.
* tests/misc/sort-spinlock-abuse.sh: Likewise.
* tests/misc/stdbuf.sh: Likewise.
* tests/misc/tac-continue.sh: Likewise.
* tests/misc/timeout-group.sh: Likewise.
* tests/mv/i-3.sh: Likewise.
* tests/rm/dangling-symlink.sh: Likewise.
* tests/rm/isatty.sh: Likewise.
* cfg.mk (sc_prohibit_test_background_without_cleanup_):
A new syntax-check to ensure cleanup_() is defined
when background tasks are created in a test.
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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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