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Diffstat (limited to 'tests/misc/stdbuf')
| -rwxr-xr-x | tests/misc/stdbuf | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/tests/misc/stdbuf b/tests/misc/stdbuf new file mode 100755 index 000000000..6f79e771f --- /dev/null +++ b/tests/misc/stdbuf @@ -0,0 +1,86 @@ +#!/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 |