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#!/bin/sh
# Exercise stdbuf functionality
# Copyright (C) 2009-2020 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 <https://www.gnu.org/licenses/>.
. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
print_ver_ stdbuf
getlimits_
# stdbuf fails when the absolute top build dir name contains e.g.,
# space, TAB, NL
lf='
'
case $abs_top_builddir in
*[\\\"\#\$\&\'\`$lf\ \ ]*)
skip_ "unsafe absolute build directory name: $abs_top_builddir";;
esac
# Use a fifo rather than a pipe in the tests below
# so that the producer (uniq) will wait until the
# consumer (dd) opens the fifo therefore increasing
# the chance that dd will read the data from each
# write separately.
mkfifo_or_skip_ fifo
# Verify input parameter checking
stdbuf -o1 true || fail=1 # verify size syntax
stdbuf -oK true || fail=1 # verify size syntax
stdbuf -o0 true || fail=1 # verify unbuffered syntax
stdbuf -oL true || fail=1 # verify line buffered syntax
# Capital 'L' required
# Internal error is a particular status
returns_ 125 stdbuf -ol true || fail=1
returns_ 125 stdbuf -o$SIZE_OFLOW true || fail=1 # size too large
returns_ 125 stdbuf -iL true || fail=1 # line buffering stdin disallowed
returns_ 125 stdbuf true || fail=1 # a buffering mode must be specified
stdbuf -i0 -o0 -e0 true || fail=1 #check all files
returns_ 126 stdbuf -o1 . || fail=1 # invalid command
returns_ 127 stdbuf -o1 no_such || fail=1 # no such command
# Terminate any background processes
cleanup_() { kill $pid 2>/dev/null && wait $pid; }
# Ensure line buffering stdout takes effect
stdbuf_linebuffer()
{
local delay="$1"
printf '1\n' > exp
> out || framework_failure_
dd count=1 if=fifo > out 2> err & pid=$!
(printf '1\n'; sleep $delay; printf '2\n') | stdbuf -oL uniq > fifo
wait $pid
compare exp out
}
retry_delay_ stdbuf_linebuffer .1 6 || fail=1
stdbuf_unbuffer()
{
local delay="$1"
# Ensure un buffering stdout takes effect
printf '1\n' > exp
> out || framework_failure_
dd count=1 if=fifo > out 2> err & pid=$!
(printf '1\n'; sleep $delay; printf '2\n') | stdbuf -o0 uniq > fifo
wait $pid
compare exp out
}
retry_delay_ stdbuf_unbuffer .1 6 || 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 exp out || 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 exp out || fail=1
# Ensure block buffering stdout takes effect
# We don't currently test block buffering failures as
# this doesn't work on GLIBC-2.7 or GLIBC-2.9 at least.
# stdbuf_blockbuffer()
# {
# local delay="$1"
#
# printf '1\n2\n' > exp
# dd count=1 if=fifo > out 2> err &
# (printf '1\n'; sleep $delay; printf '2\n') | stdbuf -o4 uniq > fifo
# wait # for dd to complete
# compare exp out
# }
#
# retry_delay_ stdbuf_blockbuffer .1 6 || fail=1
Exit $fail
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