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https://github.com/troglobit/finit.git
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Joachim Wiberg
53c7ddcb22
This patch changes the behavior of SIGUSR1. Previously USR1 could be used to halt a running Finit system, similar to BusyBox init. However, compatibility with sysvinit and systemd has been deemed more important. Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
64 lines
1.8 KiB
Markdown
64 lines
1.8 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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--------
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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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This also restarts the API (initctl) socket, like SysV init and systemd
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does on USR1 with their FIFO/D-Bus.
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`SIGUSR1`
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---------
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Since Finit 4.1 this signal causes Finit to restart its API (initctl)
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socket, like SysV init and systemd does on USR1 with their FIFO/D-Bus.
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Finit <= 4.0 performed a system halt (like USR2 without power-off), but
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this caused compatibility problems with systemd and sysvinit on desktop
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systems. Hence, since Finit 4.1 it is no longer possible to halt a
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system with a signal.
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`SIGUSR2`
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---------
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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 power
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off the system, if ACPI or similar exists to actually do this. If the
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kernel fails 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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---------
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Like `SIGUSR2`, 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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--------
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Sent from kernel when the CTRL-ALT-DEL key combo is pressed. SysV init
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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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--------
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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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