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Change SIGUSR1 to be compatible with systemd and SysV init

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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>
This commit is contained in:
Joachim Wiberg
2021-05-02 14:48:49 +02:00
parent 3872077ff1
commit 53c7ddcb22
3 changed files with 34 additions and 22 deletions
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doc/signals.md
+17 -9
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@@ -12,28 +12,36 @@ have been adopted:
Same effect as `finit q`, `init q`, or `initctl reload`, reloads all
*.conf files in `/etc/finit.d/`
This also restarts the API (initctl) socket, like SysV init and systemd
does on USR1 with their FIFO/D-Bus.
`SIGUSR1`
---------
Calls shutdown hooks, including `HOOK_SHUTDOWN`, stopping all running
processes, and unmounts all file systems. Then tells kernel to halt.
Most people these days want `SIGUSR2` though.
Since Finit 4.1 this signal causes Finit to restart its API (initctl)
socket, like SysV init and systemd does on USR1 with their FIFO/D-Bus.
Finit <= 4.0 performed a system halt (like USR2 without power-off), but
this caused compatibility problems with systemd and sysvinit on desktop
systems. Hence, since Finit 4.1 it is no longer possible to halt a
system with a signal.
SysV init and systemd use this to re-open their FIFO/D-Bus.
`SIGUSR2`
---------
Like SIGUSR1, but tell kernel to power-off the system, if ACPI or
similar exists to actually do this. If the kernel fails power-off,
Finit falls back to halt.
Calls shutdown hooks, including `HOOK_SHUTDOWN`, stopping all running
processes, and unmounts all file systems. Then tells kernel to power
off the system, if ACPI or similar exists to actually do this. If the
kernel fails power-off, Finit falls back to halt.
SysV init N/A, systemd dumps its internal state to log.
`SIGTERM`
---------
Like `SIGUSR1`, but tell kernel to reboot the system when done.
Like `SIGUSR2`, but tell kernel to reboot the system when done.
SysV init N/A, systemd rexecutes itself.