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>3.7. Error and Success Codes</A
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><P
> libraw1394 returns the ack/rcode pair in most transaction cases. The
rcode is undefined in cases where the ack code is not equal to
<CODE
CLASS="symbol"
>ack_pending</CODE
>. This is stored in a type
<SPAN
CLASS="type"
>raw1394_errcode_t</SPAN
>, from which the ack and rcode parts can
be extracted using two macros.
</P
><P
> With the function <CODE
CLASS="function"
>raw1394_errcode_to_errno()</CODE
> it is
possible to convert this to an errno number that conveys roughly the
same meaning. Many developers will find that easier to handle. This is
done automatically for the synchronous read/write/lock wrapper
functions, i.e. they return 0 for success and a negative value for
failure, in which case they also set the <CODE
CLASS="symbol"
>errno</CODE
> variable
to the appropriate code. The raw ack/rcode pair can then still be
retrieved using <CODE
CLASS="function"
>raw1394_get_errcode()</CODE
>.
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