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Shut down and reboot the system (QNX Neutrino)
phshutdown [options]
Neutrino
- -f
- Shut down fast. Send a SIGTERM signal, but wait only one second before rebooting.
- -i
- Ignore superuser (root) privileges.
- -n nodename
- Shut down the specified node (default is current node).
- -q
- Be quiet.
- -S type
- The type of shutdown, which must be one of:
- system — shut down the system.
- reboot — reboot the system.
- photon — leave Photon.
- user — same as photon
If no -S option is specified, the shutdown type is read from $HOME/.ph/phshutdown.cfg, if it exists. This file contains the shutdown type selected the last time phshutdown was used. If this file doesn't exist, phshutdown uses the default type of reboot.
- -u
- Shut down without displaying the shutdown options dialog. This option may be useful for using phshutdown in a script.
- -v
- Be verbose.
In its default configuration, phshutdown allows any user to
shut the system down. This makes it easy to use in a single-user desktop
environment but is not desirable in a multi-user, networked configuration.
If you want to make it more secure, restrict this shutdown privilege to
root by simply creating a new file, like this:
$ touch /usr/photon/config/phshutdown.restrict
The presence of this file allows any user to end a Photon session,
but prevents users who do not have the root password from
shutting down or rebooting the machine.
If you are root, this restriction does not apply unless you pass
the -i option with phshutdown. In this case, you
are treated as a non-root user and will be asked for the root
password before being allowed to shut the system down. Using this option
always provides a secure shutdown dialog, even from phlogin,
where it's always root that launches phshutdown.
|
This utility needs to have the setuid (“set user ID”)
bit set in its permissions.
If you use
mkefs,
mketfs,
or
mkifs
on a Windows host to include this utility in an image,
use the perms attribute to specify its permissions explicitly,
and the uid and gid attributes to set the ownership
correctly. |
The phshutdown utility displays a dialog of shutdown options:
If you choose to shut down the entire system, phshutdown
does it in an orderly way by:
- Causing a SIGTERM signal to be sent to all
processes listed under /proc
- Waiting for ten seconds (or one second if the -f option
is specified)
- Causing a SIGKILL signal to be sent to all remaining processes
- Rebooting the system.
The ten-second interval allows processes that have elected
to catch the SIGTERM signal to perform any cleanup they need
to do before the system is rebooted.
- /usr/photon/config/phshutdown.restrict
- The presence of this file prevents non-root users from
shutting down or rebooting the machine.
- $HOME/.ph/phshutdown.cfg
- This file holds the type of shut down selected the last time phshutdown was used.
procnto,
shutdown
Logging In, Logging Out, and Shutting Down
in the Neutrino User's Guide
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