| #!/bin/sh |
| # Check that zgrep is terminated gracefully by signal when |
| # its grep/sed pipeline is terminated by a signal. |
| |
| # Copyright (C) 2010-2016 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 <http://www.gnu.org/licenses/>. |
| # limit so don't run it by default. |
| |
| . "${srcdir=.}/init.sh"; path_prepend_ . |
| |
| echo a | gzip -c > f.gz || framework_failure_ |
| |
| test "x$PERL" = x && PERL=perl |
| ("$PERL" -e 'use POSIX qw(dup2)') >/dev/null 2>&1 || |
| skip_ "no suitable perl found" |
| |
| # Run the arguments as a command, in a process where stdout is a |
| # dangling pipe and SIGPIPE has the default signal-handling action. |
| # This can't be done portably in the shell, because if SIGPIPE is |
| # ignored when the shell is entered, the shell might refuse to trap |
| # it. Fall back on Perl+POSIX, if available. Take care to close the |
| # pipe's read end before running the program; the equivalent of the |
| # shell's "command | :" has a race condition in that COMMAND could |
| # write before ":" exits. |
| write_to_dangling_pipe () { |
| program=${1?} |
| shift |
| args= |
| for arg; do |
| args="$args, '$arg'" |
| done |
| "$PERL" -e ' |
| use POSIX qw(dup2); |
| $SIG{PIPE} = "DEFAULT"; |
| pipe my ($read_end, $write_end) or die "pipe: $!\n"; |
| dup2 fileno $write_end, 1 or die "dup2: $!\n"; |
| close $read_end or die "close: $!\n"; |
| exec '"'$program'$args"'; |
| ' |
| } |
| |
| write_to_dangling_pipe cat f.gz f.gz |
| signal_status=$? |
| test 128 -lt $signal_status || |
| framework_failure_ 'signal handling busted on this host' |
| |
| fail=0 |
| |
| write_to_dangling_pipe zgrep a f.gz f.gz |
| test $? -eq $signal_status || fail=1 |
| |
| Exit $fail |