Detect Linux Runlevel

Michael Torrie torriem at
Mon Dec 5 19:08:44 EST 2016

On 12/05/2016 04:37 PM, Marko Rauhamaa wrote:
> Unfortunately, I am not wholly impressed by the end result. Mogadishu
> has been replaced by Pyongyang. Some age-old Unix principles have been
> abandoned without clear justification. For example, I was appalled to
> find out that a systemd unit can be configured to react on the exit
> status of a child process of a daemon.

I have yet to see any evidence of this Pyonguang situation.

What is wrong with reacting to the exit status of a daemon's child process?

> Also, now D-Bus is a fixture for every daemon writer.

But not directly. It need not be a dependency on the part of the daemon
writer. In fact the daemon writer may now leave out deamonizing code
entirely if he or she wishes.  The systemd api is entirely optional for
the daemon to use.

> Guess what -- the unit files come with their own gotchas. For example,
> there is no simple way to convert an arbitrary pathname into an
> ExecStart entry of a unit file.
> The .ini file format was a lousy choice. Why not choose JSON in this day
> and age?

But why json?  ini files are at least fairly human write-able and
read-able. Json is great, but not for this application. Thank goodness
they didn't choose xml. I never liked working with LaunchDaemon's plist
files or Solaris' service definition files.

> Yes, the SysV init system had become a jungle. Still, I wish it had been
> replaced with a rigorous protocol. The units should have been programs
> that comply with given contracts.

Yes there is certainly merit to this idea, if anyone could agree on a

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