1#!/bin/sh 2# Exercise stdbuf functionality 3 4# Copyright (C) 2009-2023 Free Software Foundation, Inc. 5 6# This program is free software: you can redistribute it and/or modify 7# it under the terms of the GNU General Public License as published by 8# the Free Software Foundation, either version 3 of the License, or 9# (at your option) any later version. 10 11# This program is distributed in the hope that it will be useful, 12# but WITHOUT ANY WARRANTY; without even the implied warranty of 13# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14# GNU General Public License for more details. 15 16# You should have received a copy of the GNU General Public License 17# along with this program. If not, see <https://www.gnu.org/licenses/>. 18 19. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src 20print_ver_ stdbuf env 21 22getlimits_ 23 24# stdbuf fails when the absolute top build dir name contains e.g., 25# space, TAB, NL 26lf=' 27' 28case $abs_top_builddir in 29 *[\\\"\#\$\&\'\`$lf\ \ ]*) 30 skip_ "unsafe absolute build directory name: $abs_top_builddir";; 31esac 32 33# Use a fifo rather than a pipe in the tests below 34# so that the producer (uniq) will wait until the 35# consumer (dd) opens the fifo therefore increasing 36# the chance that dd will read the data from each 37# write separately. 38mkfifo_or_skip_ fifo 39 40 41# Verify input parameter checking 42stdbuf -o1 true || fail=1 # verify size syntax 43stdbuf -oK true || fail=1 # verify size syntax 44stdbuf -o0 true || fail=1 # verify unbuffered syntax 45stdbuf -oL true || fail=1 # verify line buffered syntax 46 47# Capital 'L' required 48# Internal error is a particular status 49returns_ 125 stdbuf -ol true || fail=1 50 51returns_ 125 stdbuf -o$SIZE_OFLOW true || fail=1 # size too large 52returns_ 125 stdbuf -iL true || fail=1 # line buffering stdin disallowed 53returns_ 125 stdbuf true || fail=1 # a buffering mode must be specified 54stdbuf -i0 -o0 -e0 true || fail=1 #check all files 55returns_ 126 env . && { returns_ 126 stdbuf -o1 . || fail=1; } # invalid command 56returns_ 127 stdbuf -o1 no_such || fail=1 # no such command 57 58# Terminate any background processes 59cleanup_() { kill $pid 2>/dev/null && wait $pid; } 60 61# Ensure line buffering stdout takes effect 62stdbuf_linebuffer() 63{ 64 local delay="$1" 65 66 printf '1\n' > exp 67 > out || framework_failure_ 68 dd count=1 if=fifo > out 2> err & pid=$! 69 (printf '1\n'; sleep $delay; printf '2\n') | stdbuf -oL uniq > fifo 70 wait $pid 71 compare exp out 72} 73 74retry_delay_ stdbuf_linebuffer .1 6 || fail=1 75 76stdbuf_unbuffer() 77{ 78 local delay="$1" 79 80 # Ensure un buffering stdout takes effect 81 printf '1\n' > exp 82 > out || framework_failure_ 83 dd count=1 if=fifo > out 2> err & pid=$! 84 (printf '1\n'; sleep $delay; printf '2\n') | stdbuf -o0 uniq > fifo 85 wait $pid 86 compare exp out 87} 88 89retry_delay_ stdbuf_unbuffer .1 6 || fail=1 90 91# Ensure un buffering stdin takes effect 92# The following works for me, but is racy. I.e., we're depending 93# on dd to run and close the fifo before the second write by uniq. 94# If we add a sleep, then we're just testing -oL 95 # printf '3\n' > exp 96 # dd count=1 if=fifo > /dev/null 2> err & 97 # printf '1\n\2\n3\n' | (stdbuf -i0 -oL uniq > fifo; cat) > out 98 # wait # for dd to complete 99 # compare exp out || fail=1 100# One could remove the need for dd (used to close the fifo to get uniq to quit 101# early), if head -n1 read stdin char by char. Note uniq | head -c2 doesn't 102# suffice due to the buffering implicit in the pipe. sed currently does read 103# stdin char by char, so we can test with 'sed 1q'. However I'm wary about 104# adding this dependency on a program outside of coreutils. 105 # printf '2\n' > exp 106 # printf '1\n2\n' | (stdbuf -i0 sed 1q >/dev/null; cat) > out 107 # compare exp out || fail=1 108 109# Ensure block buffering stdout takes effect 110# We don't currently test block buffering failures as 111# this doesn't work on GLIBC-2.7 or GLIBC-2.9 at least. 112 # stdbuf_blockbuffer() 113 # { 114 # local delay="$1" 115 # 116 # printf '1\n2\n' > exp 117 # dd count=1 if=fifo > out 2> err & 118 # (printf '1\n'; sleep $delay; printf '2\n') | stdbuf -o4 uniq > fifo 119 # wait # for dd to complete 120 # compare exp out 121 # } 122 # 123 # retry_delay_ stdbuf_blockbuffer .1 6 || fail=1 124 125Exit $fail 126