1 files changed, 126 insertions, 0 deletions
diff --git a/tests/env/env-signal-handler.sh b/tests/env/env-signal-handler.sh
new file mode 100755
index 0000000..7fc7fd6
--- /dev/null
+++ b/tests/env/env-signal-handler.sh
@@ -0,0 +1,126 @@
+#!/bin/sh
+# Test env --default-signal=PIPE feature.
+
+# Copyright (C) 2019-2023 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 <https://www.gnu.org/licenses/>.
+
+. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
+print_ver_ env seq test timeout printf
+trap_sigpipe_or_skip_
+
+# /bin/sh has an intermittent failure in ignoring SIGPIPE on OpenIndiana 11
+# so we require bash as discussed at:
+# https://lists.gnu.org/archive/html/coreutils/2020-03/msg00004.html
+require_bash_as_SHELL_
+
+# Paraphrasing https://bugs.gnu.org/34488#8:
+# POSIX requires that sh started with an inherited ignored SIGPIPE must
+# silently ignore all attempts from within the shell to restore SIGPIPE
+# handling to child processes of the shell:
+#
+#    $ (trap '' PIPE; bash -c 'trap - PIPE; seq inf | head -n1')
+#    1
+#    seq: write error: Broken pipe
+#
+# With 'env --default-signal=PIPE', the signal handler can be reset to its
+# default.
+
+# Baseline Test - default signal handler
+# --------------------------------------
+# Ensure this results in a "broken pipe" error (the first 'trap'
+# sets SIGPIPE to ignore, and the second 'trap' becomes a no-op instead
+# of resetting SIGPIPE to its default). Upon a SIGPIPE 'seq' will not be
+# terminated, instead its write(2) call will return an error.
+(trap '' PIPE; $SHELL -c 'trap - PIPE; seq 999999 2>err1t | head -n1 > out1')
+
+# The exact broken pipe message depends on the operating system, just ensure
+# there was a 'write error' message in stderr:
+sed 's/^\(seq: write error:\) .*/\1/' err1t > err1 || framework_failure_
+
+printf "1\n" > exp-out || framework_failure_
+printf "seq: write error:\n" > exp-err1 || framework_failure_
+
+compare exp-out out1 || framework_failure_
+compare exp-err1 err1 || framework_failure_
+
+
+# env test - default signal handler
+# ---------------------------------
+# With env resetting the signal handler to its defaults, there should be no
+# error message (because the default SIGPIPE action is to terminate the
+# 'seq' program):
+(trap '' PIPE;
+ env --default-signal=PIPE \
+    $SHELL -c 'trap - PIPE; seq 999999 2>err2 | head -n1 > out2')
+
+compare exp-out out2 || fail=1
+compare /dev/null err2 || fail=1
+
+# env test - default signal handler (3)
+# -------------------------------------
+# Repeat the previous test, using --default-signal with no signal names,
+# i.e., all signals.
+(trap '' PIPE;
+ env --default-signal \
+    $SHELL -c 'trap - PIPE; seq 999999 2>err4 | head -n1 > out4')
+
+compare exp-out out4 || fail=1
+compare /dev/null err4 || fail=1
+
+# env test - block signal handler
+env --block-signal true || fail=1
+
+env_ignore_delay_()
+{
+  local delay="$1"
+
+  # The first 'env' is just to ensure timeout is not a shell built-in.
+  env timeout --verbose --kill-after=.1 --signal=INT $delay \
+    env $env_opt sleep 10 > /dev/null 2>outt
+  # check only the first two lines from stderr, which are printed by timeout.
+  # (operating systems might add more messages, like "killed").
+  sed -n '1,2p' outt > out || framework_failure_
+  compare exp out
+}
+
+# Baseline test - ignore signal handler
+# -------------------------------------
+# Terminate 'sleep' with SIGINT
+# (SIGINT's default action is to terminate a program).
+cat <<\EOF >exp || framework_failure_
+timeout: sending signal INT to command 'env'
+EOF
+env_opt='' retry_delay_ env_ignore_delay_ .1 6 || fail=1
+
+# env test - ignore signal handler
+# --------------------------------
+# Use env to ignore SIGINT - "sleep" should continue running
+# after timeout sends SIGINT, and be killed using SIGKILL.
+cat <<\EOF >exp || framework_failure_
+timeout: sending signal INT to command 'env'
+timeout: sending signal KILL to command 'env'
+EOF
+env_opt='--ignore-signal=INT' retry_delay_ env_ignore_delay_ .1 6 || fail=1
+env_opt='--ignore-signal' retry_delay_ env_ignore_delay_ .1 6 || fail=1
+
+# env test --list-signal-handling
+env --default-signal --ignore-signal=INT --list-signal-handling true \
+  2> err8t || fail=1
+sed 's/(.*)/()/' err8t > err8 || framework_failure_
+env printf 'INT        (): IGNORE\n' > exp-err8 || framework_failure_
+compare exp-err8 err8 || fail=1
+
+
+Exit $fail