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In a parallel test run, it is not unusual to exceed a timeout of
1-3 seconds. Increase several from 3 or fewer to 10 seconds.
* tests/skip-device: Increase timeout from 2 to 10 seconds.
* tests/grep-dev-null-out: Likewise, but s/1/10/.
* tests/pcre-invalid-utf8-input: Likewise, but s/3/10/.
* tests/dfa-match: Likewise.
* tests/pcre-invalid-utf8-infloop: Likewise.
* tests/pcre-infloop: Likewise.
* tests/max-count-overread: Likewise.
* tests/invalid-multibyte-infloop: Likewise.
Prompted by http://bugs.gnu.org/24159.
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* NEWS: Document this.
* src/grep.c (skip_devices):
New function, with code taken from grepdirent.
(grepdirent): Use it. Avoid an unnecessary initialization.
(grepfile): If skipping devices, open files with O_NONBLOCK.
Throw in O_NOCTTY while we're at it.
(grepdesc): Skip devices here, too. Not only does this fix the
bug, it fixes an unlikely race condition if some other process
renames a device between fstatat and openat.
* tests/skip-device: Add a test for this bug.
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* NEWS:
* doc/grep.in.1 (ENVIRONMENT_VARIABLES):
* doc/grep.texi (Environment Variables):
Document that GREP_OPTIONS is obsolescent now.
* src/grep.c (main): Warn if GREP_OPTIONS is used.
* tests/r-dot, tests/skip-device: Don't use GREP_OPTIONS.
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An oversight in the 2.11 changes made it so "echo x|grep x" would
fail for those who set GREP_OPTIONS=--devices=skip.
* src/main.c (grepdesc): Ignore skip-related options when reading
from standard input.
* tests/skip-device: New file. Test for the above.
* tests/Makefile.am (TESTS): Add it.
* doc/grep.texi (File and Directory Selection): Clarify this point,
documenting the stdin exemption.
* NEWS (Bug fixes): Mention it, and add a few "[fixed in ...] notes.
Reported by Tino Keitel in http://bugs.debian.org/669084,
and forwarded to bug-grep by Aníbal Monsalve Salazar.
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