Provided by: libcomedi-dev_0.8.1-5ubuntu6_amd64 bug


       comedi_errno - number of last Comedilib error


       #include <comedilib.h>

       int comedi_errno (void );


       When  a  Comedilib  function fails, it usually returns -1 or NULL, depending on the return
       type.  An internal library variable stores an error number, which can  be  retrieved  with
       comedi_errno().   This  error  number  can  be  converted  to a human-readable form by the
       functions comedi_perror() and comedi_strerror().

       These functions are intended to mimic the behavior of the  standard  C  library  functions
       perror(),  strerror(),  and errno.  In particular, Comedilib functions sometimes return an
       error that is generated inside the C library; the comedi error message in this case is the
       same as the C library.

       The function comedi_errno() returns an integer describing the most recent comedilib error.
       This integer may be used as the errnum parameter for comedi_strerror().

       Note that comedi_errno() is deliberately different than the variable errno.   This  is  to
       overcome difficulties in making errno thread-safe.

                                         28 October 2007                          COMEDI_ERRNO(3)