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#!/bin/sh
# Exercise stdbuf functionality
# Copyright (C) 2009 Free Software Foundation, Inc.
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
if test "$VERBOSE" = yes; then
set -x
stdbuf --version
fi
. $srcdir/test-lib.sh
getlimits_
# Use a fifo rather than a pipe in the tests below
# so that the producer (uniq) will wait until the
# consumer (dd) opens the fifo therefore increasing
# the chance that dd will read the data from each
# write separately.
mkfifo fifo || framework_failure
fail=0
# Verify input parameter checking
stdbuf -o1 true || fail=1 # verify size syntax
stdbuf -oK true || fail=1 # verify size syntax
stdbuf -o0 true || fail=1 # verify unbuffered syntax
stdbuf -oL true || fail=1 # verify line buffered syntax
stdbuf -ol true && fail=1 # Capital 'L' required
stdbuf -o$SIZE_OFLOW true && fail=1 # size too large
stdbuf -iL true && fail=1 # line buffering stdin disallowed
# Ensure line buffering stdout takes effect
printf '1\n' > exp
dd count=1 if=fifo > out 2> err &
(printf '1\n'; sleep .2; printf '2\n') | stdbuf -oL uniq > fifo
wait # for dd to complete
compare out exp || fail=1
# Ensure un buffering stdout takes effect
printf '1\n' > exp
dd count=1 if=fifo > out 2> err &
(printf '1\n'; sleep .2; printf '2\n') | stdbuf -o0 uniq > fifo
wait # for dd to complete
compare out exp || fail=1
# Ensure un buffering stdin takes effect
# The following works for me, but is racy. I.E. we're depending
# on dd to run and close the fifo before the second write by uniq.
# If we add a sleep, then we're just testing -oL
# printf '3\n' > exp
# dd count=1 if=fifo > /dev/null 2> err &
# printf '1\n\2\n3\n' | (stdbuf -i0 -oL uniq > fifo; cat) > out
# wait # for dd to complete
# compare out exp || fail=1
# One could remove the need for dd (used to close the fifo to get uniq to quit
# early), if head -n1 read stdin char by char. Note uniq | head -c2 doesn't
# suffice due to the buffering implicit in the pipe. sed currently does read
# stdin char by char, so we can test with `sed 1q`. However I'm wary about
# adding this dependency on a program outside of coreutils.
# printf '2\n' > exp
# printf '1\n2\n' | (stdbuf -i0 sed 1q >/dev/null; cat) > out
# compare out exp || fail=1
# Ensure block buffering stdout takes effect
# We don't currently test block buffering failures as
# this doesn't work on on GLIBC-2.7 or GLIBC-2.9 at least.
# printf '1\n2\n' > exp
# dd count=1 if=fifo > out 2> err &
# (printf '1\n'; sleep .2; printf '2\n') | stdbuf -o4 uniq > fifo
# wait # for dd to complete
# compare out exp || fail=1
Exit $fail
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