dadGetNackErrno

Returns the contents of the variable nack_errno if this is not available to the programming language (like in f77)

f77:  Call dadGetNackErrno( nackerr ) 
      integer nackerr
  or
C:    int dadGetNackErrno( int *nackerr );

The nackerr is set to the value of nack_error. This is the variable which contains the server error if a c_Nack was received. See also: Dad error numbers.