2017-02-24 15:09:17 +00:00
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#!/bin/sh
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# Check that zgrep is terminated gracefully by signal when
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# its grep/sed pipeline is terminated by a signal.
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# Copyright (C) 2010-2016 Free Software Foundation, Inc.
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# limit so don't run it by default.
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2017-02-27 21:01:03 +00:00
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. "${srcdir=.}/init.sh"; path_prepend_ .
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2017-02-24 15:09:17 +00:00
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echo a | gzip -c > f.gz || framework_failure_
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test "x$PERL" = x && PERL=perl
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("$PERL" -e 'use POSIX qw(dup2)') >/dev/null 2>&1 ||
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skip_ "no suitable perl found"
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# Run the arguments as a command, in a process where stdout is a
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# dangling pipe and SIGPIPE has the default signal-handling action.
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# This can't be done portably in the shell, because if SIGPIPE is
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# ignored when the shell is entered, the shell might refuse to trap
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# it. Fall back on Perl+POSIX, if available. Take care to close the
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# pipe's read end before running the program; the equivalent of the
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# shell's "command | :" has a race condition in that COMMAND could
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# write before ":" exits.
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write_to_dangling_pipe () {
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program=${1?}
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shift
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args=
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for arg; do
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args="$args, '$arg'"
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done
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"$PERL" -e '
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use POSIX qw(dup2);
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$SIG{PIPE} = "DEFAULT";
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pipe my ($read_end, $write_end) or die "pipe: $!\n";
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dup2 fileno $write_end, 1 or die "dup2: $!\n";
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close $read_end or die "close: $!\n";
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exec '"'$program'$args"';
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'
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}
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write_to_dangling_pipe cat f.gz f.gz
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signal_status=$?
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test 128 -lt $signal_status ||
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framework_failure_ 'signal handling busted on this host'
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fail=0
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write_to_dangling_pipe zgrep a f.gz f.gz
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test $? -eq $signal_status || fail=1
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Exit $fail
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