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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><HTML><HEAD> <META NAME="GENERATOR" CONTENT="LinuxDoc-Tools 0.9.20"> <TITLE>cc65 function reference: Alphabetical function reference: perror</TITLE> <LINK HREF="funcref-128.html" REL=next> <LINK HREF="funcref-126.html" REL=previous> <LINK HREF="funcref.html#toc3" REL=contents></HEAD><BODY><A HREF="funcref-128.html">Next</A><A HREF="funcref-126.html">Previous</A><A HREF="funcref.html#toc3">Contents</A><HR><H2><A NAME="perror"></A> 3.86 <A HREF="funcref.html#toc3.86">perror</A></H2><P><BLOCKQUOTE><DL><DT><B>Function</B><DD><P>Print an error message for the error in <CODE>errno</CODE>.</P><DT><B>Header</B><DD><P><CODE><A HREF="funcref-33.html#stdio.h">stdio.h</A></CODE></P><DT><B>Declaration</B><DD><P><CODE>void __fastcall__ perror (const char* s);</CODE></P><DT><B>Description</B><DD><P><CODE>perror</CODE> prints an error message to <CODE>stderr</CODE>. If <CODE>s</CODE>is not <CODE>NULL</CODE> and not an empty string, it is printed followed by a colon anda blank. Then the error message for the current contents of <CODE>errno</CODE> isprinted followed by a newline. The message output is the same as returned by<CODE><A HREF="funcref-150.html#strerror">strerror</A></CODE> with an argument of <CODE>errno</CODE>.</P><DT><B>Limits</B><DD><P><UL><LI>The function is only available as fastcall function, so it may onlybe used in presence of a prototype.</LI></UL></P><DT><B>Availability</B><DD><P>ISO 9899</P><DT><B>See also</B><DD><P><A HREF="funcref-45.html#_poserror">_poserror</A>,<A HREF="funcref-150.html#strerror">strerror</A>,</P><DT><B>Example</B><DD><P>None.</P></DL></BLOCKQUOTE></P><HR><A HREF="funcref-128.html">Next</A><A HREF="funcref-126.html">Previous</A><A HREF="funcref.html#toc3">Contents</A></BODY></HTML>⌨️ 快捷键说明
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