648db22b |
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 |