Importing NanoBlogger post "Stripchart"

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+[[!meta  title="Stripchart"]]
+[[!meta  date="2008-07-08 17:03:08"]]
+I was trying to troubleshoot the feedback loop on our Nanoscope today, and
+when I went to fire up my [Comedi](http://www.comedi.org/)-driven stripcharts
+monitoring some lines in the DB-25 cable connecting the Multimode to the
+Nanoscope, I got a bunch of wierd errors (errnos 11 and 29).  I tracked them
+down to some of the Xlib function calls in my stripchart code (yes, I wrote my
+own
+[stripchart](http://www.physics.drexel.edu/~wking/rsrch/code/index.shtml#stripchart)
+code, so sue me), which I don't understand, since I can't find any reference to
+Xlib functions setting errnos.
+
+Anyhow, I've patched up my source to gleefully ignore any Xlib errno settings,
+and things seem to be back up and running now.  Feel free to give my stripchart
+code a whirl, since I quite enjoy it :p.
+
+[[!tag  programming]]