1#!/bin/sh 2# Check that zgrep is terminated gracefully by signal when 3# its grep/sed pipeline is terminated by a signal. 4 5# Copyright (C) 2010-2016 Free Software Foundation, Inc. 6 7# This program is free software: you can redistribute it and/or modify 8# it under the terms of the GNU General Public License as published by 9# the Free Software Foundation, either version 3 of the License, or 10# (at your option) any later version. 11 12# This program is distributed in the hope that it will be useful, 13# but WITHOUT ANY WARRANTY; without even the implied warranty of 14# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15# GNU General Public License for more details. 16 17# You should have received a copy of the GNU General Public License 18# along with this program. If not, see <https://www.gnu.org/licenses/>. 19# limit so don't run it by default. 20 21. "${srcdir=.}/init.sh"; path_prepend_ . 22 23echo a | gzip -c > f.gz || framework_failure_ 24 25test "x$PERL" = x && PERL=perl 26("$PERL" -e 'use POSIX qw(dup2)') >/dev/null 2>&1 || 27 skip_ "no suitable perl found" 28 29# Run the arguments as a command, in a process where stdout is a 30# dangling pipe and SIGPIPE has the default signal-handling action. 31# This can't be done portably in the shell, because if SIGPIPE is 32# ignored when the shell is entered, the shell might refuse to trap 33# it. Fall back on Perl+POSIX, if available. Take care to close the 34# pipe's read end before running the program; the equivalent of the 35# shell's "command | :" has a race condition in that COMMAND could 36# write before ":" exits. 37write_to_dangling_pipe () { 38 program=${1?} 39 shift 40 args= 41 for arg; do 42 args="$args, '$arg'" 43 done 44 "$PERL" -e ' 45 use POSIX qw(dup2); 46 $SIG{PIPE} = "DEFAULT"; 47 pipe my ($read_end, $write_end) or die "pipe: $!\n"; 48 dup2 fileno $write_end, 1 or die "dup2: $!\n"; 49 close $read_end or die "close: $!\n"; 50 exec '"'$program'$args"'; 51 ' 52} 53 54write_to_dangling_pipe cat f.gz f.gz 55signal_status=$? 56test 128 -lt $signal_status || 57 framework_failure_ 'signal handling busted on this host' 58 59fail=0 60 61write_to_dangling_pipe zgrep a f.gz f.gz 62test $? -eq $signal_status || fail=1 63 64Exit $fail 65