mirror of
https://https.git.savannah.gnu.org/git/bash.git
synced 2026-06-21 12:57:58 +02:00
Chet Ramey
67 lines
1.6 KiB
Plaintext
67 lines
1.6 KiB
Plaintext
# 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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#
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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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#
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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 <http://www.gnu.org/licenses/>.
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#
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# setalrm - set a timer to fire in N seconds and send SIGALRM to the shell
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#
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# usage: setalrm [-c] N
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#
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# -c means to reset the trap on ALRM if the timer is canceled
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#
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# If N = 0, we cancel any pending alarm by killing the background timeout
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# process. Any value greater than 0 sets a timeout for N seconds. Values
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# of N less than zero are errors.
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declare -i alrmpid=
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setalrm()
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{
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local untrap=
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local setalrm_usage="setalrm: usage: setalrm [-c] N"
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while getopts c opt; do
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case $opt in
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c) untrap=1 ;;
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*) echo "$setalrm_usage" >&2 ; return 2;;
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esac
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done
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shift $(( $OPTIND - 1 ))
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if [[ -z $1 ]]; then
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echo "$setalrm_usage" >&2
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return 2
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fi
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if (( $1 < 0 )); then
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echo "setalrm: timeout must be greater than zero" >& 2
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return 2
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fi
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if [[ $1 -eq 0 ]] && [[ -n "$alrmpid" ]]; then
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kill -TERM $alrmpid ; es=$?
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alrmpid=
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if [ -n "$untrap" ]; then
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trap - ALRM # caller saves if desired
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fi
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return $es
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fi
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# setting alarm
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{ trap - ALRM ; sleep $1; kill -ALRM $$; } &
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alrmpid=$!
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return 0
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}
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