126 lines
4.6 KiB
Bash
Executable file
126 lines
4.6 KiB
Bash
Executable file
#!/bin/sh
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# Test env --default-signal=PIPE feature.
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# Copyright (C) 2019-2025 Free Software Foundation, Inc.
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
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print_ver_ env seq test timeout printf
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trap_sigpipe_or_skip_
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# /bin/sh has an intermittent failure in ignoring SIGPIPE on OpenIndiana 11
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# so we require bash as discussed at:
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# https://lists.gnu.org/archive/html/coreutils/2020-03/msg00004.html
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require_bash_as_SHELL_
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# Paraphrasing https://bugs.gnu.org/34488#8:
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# POSIX requires that sh started with an inherited ignored SIGPIPE must
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# silently ignore all attempts from within the shell to restore SIGPIPE
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# handling to child processes of the shell:
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#
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# $ (trap '' PIPE; bash -c 'trap - PIPE; seq inf | head -n1')
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# 1
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# seq: write error: Broken pipe
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#
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# With 'env --default-signal=PIPE', the signal handler can be reset to its
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# default.
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# Baseline Test - default signal handler
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# --------------------------------------
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# Ensure this results in a "broken pipe" error (the first 'trap'
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# sets SIGPIPE to ignore, and the second 'trap' becomes a no-op instead
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# of resetting SIGPIPE to its default). Upon a SIGPIPE 'seq' will not be
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# terminated, instead its write(2) call will return an error.
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(trap '' PIPE; $SHELL -c 'trap - PIPE; seq 999999 2>err1t | head -n1 > out1')
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# The exact broken pipe message depends on the operating system, just ensure
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# there was a 'write error' message in stderr:
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sed 's/^\(seq: write error:\) .*/\1/' err1t > err1 || framework_failure_
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printf "1\n" > exp-out || framework_failure_
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printf "seq: write error:\n" > exp-err1 || framework_failure_
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compare exp-out out1 || framework_failure_
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compare exp-err1 err1 || framework_failure_
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# env test - default signal handler
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# ---------------------------------
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# With env resetting the signal handler to its defaults, there should be no
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# error message (because the default SIGPIPE action is to terminate the
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# 'seq' program):
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(trap '' PIPE;
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env --default-signal=PIPE \
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$SHELL -c 'trap - PIPE; seq 999999 2>err2 | head -n1 > out2')
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compare exp-out out2 || fail=1
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compare /dev/null err2 || fail=1
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# env test - default signal handler (3)
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# -------------------------------------
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# Repeat the previous test, using --default-signal with no signal names,
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# i.e., all signals.
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(trap '' PIPE;
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env --default-signal \
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$SHELL -c 'trap - PIPE; seq 999999 2>err4 | head -n1 > out4')
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compare exp-out out4 || fail=1
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compare /dev/null err4 || fail=1
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# env test - block signal handler
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env --block-signal true || fail=1
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env_ignore_delay_()
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{
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local delay="$1"
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# The first 'env' is just to ensure timeout is not a shell built-in.
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env timeout --verbose --kill-after=.1 --signal=INT $delay \
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env $env_opt sleep 10 > /dev/null 2>outt
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# check only the first two lines from stderr, which are printed by timeout.
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# (operating systems might add more messages, like "killed").
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sed -n '1,2p' outt > out || framework_failure_
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compare exp out
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}
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# Baseline test - ignore signal handler
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# -------------------------------------
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# Terminate 'sleep' with SIGINT
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# (SIGINT's default action is to terminate a program).
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cat <<\EOF >exp || framework_failure_
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timeout: sending signal INT to command 'env'
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EOF
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env_opt='' retry_delay_ env_ignore_delay_ .1 6 || fail=1
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# env test - ignore signal handler
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# --------------------------------
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# Use env to ignore SIGINT - "sleep" should continue running
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# after timeout sends SIGINT, and be killed using SIGKILL.
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cat <<\EOF >exp || framework_failure_
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timeout: sending signal INT to command 'env'
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timeout: sending signal KILL to command 'env'
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EOF
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env_opt='--ignore-signal=INT' retry_delay_ env_ignore_delay_ .1 6 || fail=1
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env_opt='--ignore-signal' retry_delay_ env_ignore_delay_ .1 6 || fail=1
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# env test --list-signal-handling
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env --default-signal --ignore-signal=INT --list-signal-handling true \
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2> err8t || fail=1
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sed 's/(.*)/()/' err8t > err8 || framework_failure_
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env printf 'INT (): IGNORE\n' > exp-err8 || framework_failure_
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compare exp-err8 err8 || fail=1
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Exit $fail
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