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cleanup.subr
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cleanup.subr
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# Copyright 2013 Google Inc.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# * Neither the name of Google Inc. nor the names of its contributors
# may be used to endorse or promote products derived from this software
# without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
shtk_import bool
shtk_import list
# List of registered cleanup handlers (function names).
_Shtk_Cleanup_Handlers=
# List of exit traps that execute the cleanup handlers.
_Shtk_Cleanup_Traps="EXIT HUP INT TERM"
# Whether the exit traps have been installed or not.
_Shtk_Cleanup_Installed=false
# Executes all installed cleanup handlers.
_shtk_cleanup_run_handlers() {
local signo="${1}"; shift
local exitcode="${1}"; shift
for handler in ${_Shtk_Cleanup_Handlers}; do
eval "${handler}" || true
done
trap - ${_Shtk_Cleanup_Traps} # Prevent double execution.
if [ "${signo}" = EXIT ]; then
exit "${exitcode}"
else
kill "-${signo}" ${$}
fi
}
# Sets up exit traips to run the cleanup handlers.
_shtk_cleanup_install_traps() {
if shtk_bool_check "${_Shtk_Cleanup_Installed}"; then
return 0
fi
for code in ${_Shtk_Cleanup_Traps}; do
trap "_shtk_cleanup_run_handlers '${code}' \$?" "${code}"
done
_Shtk_Cleanup_Installed=true
}
shtk_cleanup_register() {
for funcname in "${@}"; do
shtk_list_contains "${funcname}" ${_Shtk_Cleanup_Handlers} \
|| _Shtk_Cleanup_Handlers="${_Shtk_Cleanup_Handlers} ${funcname}"
done
_shtk_cleanup_install_traps
}