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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd">
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><HEAD
><TITLE
>Diagnostics</TITLE
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TITLE="YAZ User's Guide and Reference"
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><DIV
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><H1
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><A
NAME="comstack.diagnostics"
>Diagnostics</A
></H1
><P
> All functions return -1 if an error occurs. Typically, the functions
will return 0 on success, but the data exchange functions
(<CODE
CLASS="function"
>cs_get</CODE
>, <CODE
CLASS="function"
>cs_put</CODE
>,
<CODE
CLASS="function"
>cs_more</CODE
>) follow special rules. Consult their
descriptions.
</P
><P
> When a function (including the data exchange functions) reports an
error condition, use the function
<CODE
CLASS="function"
>cs_errno()</CODE
> to determine the cause of the
problem. The function
</P
><PRE
CLASS="synopsis"
> void cs_perror(COMSTACK handle char *message);
</PRE
><P
> works like <CODE
CLASS="function"
>perror(2)</CODE
> and prints the
<TT
CLASS="literal"
>message</TT
> argument, along with a system message, to
<TT
CLASS="literal"
>stderr</TT
>. Use the character array
</P
><PRE
CLASS="synopsis"
> extern const char *cs_errlist[];
</PRE
><P
> to get hold of the message, if you want to process it differently.
The function
</P
><PRE
CLASS="synopsis"
> const char *cs_stackerr(COMSTACK handle);
</PRE
><P
> Returns an error message from the lower layer, if one has been
provided.
</P
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