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37 lines
1.4 KiB
Markdown
37 lines
1.4 KiB
Markdown
Finit Signals
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=============
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Finit is often used on embedded and small Linux systems with BusyBox.
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Though Finit comes with its own tools for (poweroff, halt, reboot), for
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compatibility with the existing BusyBox toolset the following signals
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have been adopted:
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* `SIGHUP`
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Same effect as `finit q`, `init q`, or `initctl reload`, reloads all
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*.conf files in `/etc/finit.d/`
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* `SIGUSR1`
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Calls shutdown hooks, including `HOOK_SHUTDOWN`, stopping all running
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processes, and unmounts all file systems. Then tells kernel to halt.
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Most people these days want `SIGUSR2` though.
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SysV init and systemd use this to re-open their FIFO/D-Bus.
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* `SIGUSR2`
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Like SIGUSR1, but tell kernel to power-off the system, if ACPI
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or similar exists to actually do this. If the kernel fails
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power-off, Finit falls back to halt.
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SysV init N/A, systemd dumps its internal state to log.
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* `SIGTERM`
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Like `SIGUSR1`, but tell kernel to reboot the system when done.
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SysV init N/A, systemd rexecutes itself.
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* `SIGINT`
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Sent from kernel when the CTRL-ALT-DEL key combo is pressed.
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SysV init and systemd default to reboot with `shutdown -r`.
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Finit currently forwards this to `SIGTERM`.
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* `SIGPWR`
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Sent from a power daemon, like `powstatd(8)`, on changes to the
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UPS status. Traditionally SysV init read /etc/powerstatus and
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acted on "OK", "FAIL", or "LOW" and then removed the file.
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Finit currently forwards this to `SIGUSR2`.
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