Functions:-General string output routine for any module to use. Notes based on code as of Sat Mar 7 10:11:55 EST 2015 void gpsd_log(struct gpsd_errout_t, int errlevel, const char *fmt, ... ) Provides the outputting of strings to stderr or through a specified hook function in the errout structure for anyone who needs it. Used extensively by many functions to log errors or progress. Responds according to the errlevel argument, which is filled by the DEBUG command line argument, so that the verbosity of output is conditional on the user's wishes at runtime.