heainit

•  headas.h
  

  Header file containing function prototypes, etc.

•  headas_init.c
  

  Contains routines called internally - developers should not ever need to call these explicitly:

  •  int headas_init(int, char **)
    

    Calls routines to initialize PIL and output streams. It also deals with standard HEADAS parameters (chatter, clobber, history).

  •  int headas_close()
    

    Closes output streams and PIL.

  •  int hdIOInit()
    

    Checks environment variables (e.g. HEADASOUTPUT, HEADASERROR) and sets up output streams.

  •  int hd_pil_err_logger(char *s)
    

    Default PIL error logging routine. Simply prints to stderr.

  •  int headas_start_up(int, char **, const char *)
    

    Set up logging.

•  headas_main.c
  

  This file comprises the main program unit for every task. It calls headas_init() followed by the task subroutine itself and then calls headas_close() after the task completes. This main routine is not part of any library and must be explicitly included by all C tasks (via #include "headas_main.c"). For Fortran tasks it is automatically compiled and linked in by the Makefile.