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# Exercise stdbuf functionality
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# Copyright (C) 2009-2012 Free Software Foundation, Inc.
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
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# stdbuf fails when the absolute top build dir name contains e.g.,
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case $abs_top_builddir in
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*[\\\"\#\$\&\'\`$lf\ \ ]*)
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skip_ "unsafe absolute build directory name: $abs_top_builddir";;
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# Use a fifo rather than a pipe in the tests below
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# so that the producer (uniq) will wait until the
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# consumer (dd) opens the fifo therefore increasing
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# the chance that dd will read the data from each
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# Verify input parameter checking
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stdbuf -o1 true || fail=1 # verify size syntax
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stdbuf -oK true || fail=1 # verify size syntax
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stdbuf -o0 true || fail=1 # verify unbuffered syntax
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stdbuf -oL true || fail=1 # verify line buffered syntax
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stdbuf -ol true # Capital 'L' required
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test $? = 125 || fail=1 # Internal error is a particular status
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stdbuf -o$SIZE_OFLOW true # size too large
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test $? = 125 || fail=1
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stdbuf -iL true # line buffering stdin disallowed
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test $? = 125 || fail=1
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stdbuf -i0 -o0 -e0 true || fail=1 #check all files
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stdbuf -o1 . # invalid command
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test $? = 126 || fail=1
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stdbuf -o1 no_such # no such command
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test $? = 127 || fail=1
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# Ensure line buffering stdout takes effect
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dd count=1 if=fifo > out 2> err &
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(printf '1\n'; sleep $delay; printf '2\n') | stdbuf -oL uniq > fifo
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wait # for dd to complete
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retry_delay_ stdbuf_linebuffer .1 6 || fail=1
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# Ensure un buffering stdout takes effect
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dd count=1 if=fifo > out 2> err &
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(printf '1\n'; sleep $delay; printf '2\n') | stdbuf -o0 uniq > fifo
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wait # for dd to complete
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retry_delay_ stdbuf_unbuffer .1 6 || fail=1
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# Ensure un buffering stdin takes effect
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# The following works for me, but is racy. I.E. we're depending
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# on dd to run and close the fifo before the second write by uniq.
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# If we add a sleep, then we're just testing -oL
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# dd count=1 if=fifo > /dev/null 2> err &
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# printf '1\n\2\n3\n' | (stdbuf -i0 -oL uniq > fifo; cat) > out
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# wait # for dd to complete
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# compare exp out || fail=1
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# One could remove the need for dd (used to close the fifo to get uniq to quit
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# early), if head -n1 read stdin char by char. Note uniq | head -c2 doesn't
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# suffice due to the buffering implicit in the pipe. sed currently does read
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# stdin char by char, so we can test with 'sed 1q'. However I'm wary about
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# adding this dependency on a program outside of coreutils.
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# printf '1\n2\n' | (stdbuf -i0 sed 1q >/dev/null; cat) > out
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# compare exp out || fail=1
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# Ensure block buffering stdout takes effect
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# We don't currently test block buffering failures as
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# this doesn't work on GLIBC-2.7 or GLIBC-2.9 at least.
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# stdbuf_blockbuffer()
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# printf '1\n2\n' > exp
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# dd count=1 if=fifo > out 2> err &
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# (printf '1\n'; sleep $delay; printf '2\n') | stdbuf -o4 uniq > fifo
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# wait # for dd to complete
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# retry_delay_ stdbuf_blockbuffer .1 6 || fail=1
added
removed
tests/misc/stdbuf.sh
