| 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 | . "${srcdir=.}/init.sh"; path_prepend_ . |
| 22 | |
| 23 | echo a | gzip -c > f.gz || framework_failure_ |
| 24 | |
| 25 | test "x$PERL" = x && PERL=perl |
| 26 | ("$PERL" -e 'use POSIX qw(dup2)') >/dev/null 2>&1 || |
| 27 | skip_ "no suitable perl found" |
| 28 | |
| 29 | # Run the arguments as a command, in a process where stdout is a |
| 30 | # dangling pipe and SIGPIPE has the default signal-handling action. |
| 31 | # This can't be done portably in the shell, because if SIGPIPE is |
| 32 | # ignored when the shell is entered, the shell might refuse to trap |
| 33 | # it. Fall back on Perl+POSIX, if available. Take care to close the |
| 34 | # pipe's read end before running the program; the equivalent of the |
| 35 | # shell's "command | :" has a race condition in that COMMAND could |
| 36 | # write before ":" exits. |
| 37 | write_to_dangling_pipe () { |
| 38 | program=${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'$args"'; |
| 51 | ' |
| 52 | } |
| 53 | |
| 54 | write_to_dangling_pipe cat f.gz f.gz |
| 55 | signal_status=$? |
| 56 | test 128 -lt $signal_status || |
| 57 | framework_failure_ 'signal handling busted on this host' |
| 58 | |
| 59 | fail=0 |
| 60 | |
| 61 | write_to_dangling_pipe zgrep a f.gz f.gz |
| 62 | test $? -eq $signal_status || fail=1 |
| 63 | |
| 64 | Exit $fail |