Bash unix signals: Difference between revisions
From wikinotes
| Line 21: | Line 21: | ||
= Callback on Signal = | = Callback on Signal = | ||
<blockquote> | <blockquote> | ||
<syntaxhighlight lang="bash"> | <syntaxhighlight lang="bash"> | ||
# Install callback for SIGINT and SIGTRAP | |||
on_signal() { | on_signal() { | ||
echo "received SIGINT or SIGTRAP!" | echo "received SIGINT or SIGTRAP!" | ||
} | } | ||
trap on_signal SIGINT SIGTRAP | trap on_signal SIGINT SIGTRAP | ||
Uninstall a trap | # Uninstall a trap | ||
trap - SIGINT SIGTRAP | trap - SIGINT SIGTRAP | ||
</syntaxhighlight> | </syntaxhighlight> | ||
</blockquote><!-- Callback on Signal --> | </blockquote><!-- Callback on Signal --> | ||
Revision as of 12:24, 17 July 2021
Documentation
man 7 signalhttps://man.archlinux.org/man/core/man-pages/signal.7.en wikipedia: unix signals https://en.wikipedia.org/wiki/Signal_(IPC)#POSIX_signals
Send Signal
kill -l # list all signals kill -9 ${PID} # send signal 9 (SIGKILL) kill -SIGINT ${PID} # send isgnal 2 (SIGINT)
Callback on Signal
# Install callback for SIGINT and SIGTRAP on_signal() { echo "received SIGINT or SIGTRAP!" } trap on_signal SIGINT SIGTRAP # Uninstall a trap trap - SIGINT SIGTRAP
