5.  Error Handling and Error Codes

5.1.  Error Handling

All learn mode library functions return a value to indicate success or failure of the function. A return value of zero or a non-negative number indicates success. A return value of -1 indicates failure.

If a library function fails, call the standard attribute functions ATDV_LASTERR( ) and ATDV_ERRMSGP( ) to determine the reason for failure. For more information on these functions, see the Voice Software Reference - Standard Runtime Library.

NOTE:

If ATDV_LASTERR( ) returns the EDX_SYSTEM error code, an operating system error has occurred. Check the global variable errno contained in errno.h. Use dx_fileerrno( ) to obtain the system error value.

For a list of errors that can be returned by a learn mode library function, see 5.2.  Learn Mode Error Codes.

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