On Tue, 07.03.17 03:15, lin webber (webber...@outlook.com) wrote:
> I use “system("reboot")” in my C program and system does not shutdown.I think
> that systemd is waiting for some services to shutdown which can't shutdown
> immediately.
> But I don't want to wait for those services to shutdown.How can I shutdown my
> system immediately in my C program.which API should I call?
> Thank you for reply.
There are several ways to reboot your system:
1) use the raw reboot() syscall. In this case file systems might end
up being dirty, and some more complex daemons might not like it
either.
2) Use "systemctl reboot -ff", which is pretty much the same as #1,
but accessible from the shell.
3) Use "systemctl reboot -f", which is a slightly friendlier version
than the above. In this mode, systemd won't bother with stopping
services correctly (instead it will just SIGTERM them all and
SIGKILL what is left then). However it will still place all file
systems in a clean state before issuing reboot().
4) Use "systemctl reboot", which is the friendliest version and
correctly shuts down all services, i.e. is equivalent to plain
"reboot" the way you already tried.
Unless you have a completely stateless system with all file systems
either read-only or formatted on each boot #3 is the vastly better
option than #1/#2.
Lennart
--
Lennart Poettering, Red Hat
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