http://pubs.opengroup.org/onlinepubs/9699919799/functions/gets.html
quo is not specified when the return value is nan only if y is zero
-http://pubs.opengroup.org/onlinepubs/9699919799/functions/remquo.html
\ No newline at end of file
+http://pubs.opengroup.org/onlinepubs/9699919799/functions/remquo.html
+
+"If x is 0.0, -HUGE_VAL shall be returned" is specified for y0,y1,yn
+but yn(1,x) == -yn(-1,x) so this is incorrect mathematically
+http://pubs.opengroup.org/onlinepubs/9699919799/functions/yn.html
+
+what if syslog fails (bad printf args..)
+http://pubs.opengroup.org/onlinepubs/9699919799/functions/syslog.html
+