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Diffstat (limited to '')
| -rwxr-xr-x | tests/misc/stdbuf.sh | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/tests/misc/stdbuf.sh b/tests/misc/stdbuf.sh new file mode 100755 index 0000000..2d50dbe --- /dev/null +++ b/tests/misc/stdbuf.sh @@ -0,0 +1,125 @@ +#!/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 |