maint: update copyright year, bootstrap, init.sh

[debian/gzip] / tests / zgrep-signal

diff --git a/tests/zgrep-signal b/tests/zgrep-signal
old mode 100644 (file)
new mode 100755 (executable)
index 4acd737..13783ef
--- a/tests/zgrep-signal
+++ b/tests/zgrep-signal
@@ -2,7 +2,7 @@
 # Check that zgrep is terminated gracefully by signal when
 # its grep/sed pipeline is terminated by a signal.
 
-# Copyright (C) 2010 Free Software Foundation, Inc.
+# 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
@@ -18,21 +18,47 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 # limit so don't run it by default.
 
-if test "$VERBOSE" = yes; then
-  set -x
-  gzip --version
-fi
+. "${srcdir=.}/init.sh"; path_prepend_ ..
 
-: ${srcdir=.}
-. "$srcdir/tests/init.sh"
+echo a | gzip -c > f.gz || framework_failure_
 
-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"
 
-fail=0
+# 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'
 
-status=$(exec 3>&1; (zgrep a f.gz f.gz; echo $? >&3) | :) ||
-         framework_failure
+fail=0
 
-test "$status" = 141 || fail=1
+write_to_dangling_pipe zgrep a f.gz f.gz
+test $? -eq $signal_status || fail=1
 
 Exit $fail