[clug] Software ergonomics
bryan at netspeed.com.au
Tue Jan 27 10:56:37 MST 2015
Thanks for the explanation, Jason:
> SIOCADDRT is one of many "socket I/O commands" that you can issue in
> an ioctl() system call. You can see the whole gory list here:
Horrors! So as a user, I just have to get used to staggering gobbledegook.
> The error code is a bit of a hack. You see, the ioctl() system call
> can do a huge number of different things depending on what object is
> attached to the file descriptor you call it on, and what command you
> issue. But there are only a fixed number of errno error values. So
> they get re-used with different nuance depending on the object that is
> being operated on. And the people who wrote the "route" command just
> expanded the error return code using the generic messages. It just so
> happens that the "File exists" error code is what is returned from the
> ioctl system call for the SIOCADDRT operation if there's an existing
> route that clashes with the one you're trying to add.
On a public service review panel, I discovered that "High level
communication skills, oral and in writing"--meant a pleasant telephone
> On a box with RPM, you could type:
So I installed the RPM Package Manager.
> [jao900 at raijin3 ~]$ rpm -qf `which route`
But the quoted section resulted in a "file not found" error message.
> URL : http://net-tools.berlios.de/
> So you could head to that URL and see if there's a mailing list.
But that yielded a "Server not found" error message.
> Unless you want to submit a patch to the 'route' source code yourself
> I doubt that you'd get much traction with the developers.
I don't feel sufficiently competent to try that! So I think then that my
need is interpretive.
> Even if you do submit a patch, it's anyone's guess whether it will get
> integrated and make it into a released binary...
I used to hear public servants wail "You can't beat the system."!
> Most people don't type route commands that often, and of those that
> do, a lot of them know or guess what the error means.
Yes, that was the case for me. But I am curious, and so looked it up.
Can you suggest any place to look up strange (system) messages?
> Not being rude here, just... pragmatic.
Using Linux feels far from plug-and-play! I get stopped in my tracks on
encountering technical detail. So different from the Mac I used a year ago!
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