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<html>
<head>
<title>warn</title>
<link rel="stylesheet" type="text/css" media="all" href="../man.css">
</head>
<body bgcolor=#ffffff>
<h2 align=center>warn</h2>
<h4 align=center>OS/161 Reference Manual</h4>
<h3>Name</h3>
<p>
warn, warnx, vwarn, vwarnx - print warning messages
</p>
<h3>Library</h3>
<p>
Standard C Library (libc, -lc)
</p>
<h3>Synopsis</h3>
<p>
<tt>#include &lt;err.h&gt;</tt><br>
<br>
<tt>void</tt><br>
<tt>warn(const char *</tt><em>format</em><tt>, ...);</tt><br>
<br>
<tt>void</tt><br>
<tt>warnx(const char *</tt><em>format</em><tt>, ...);</tt><br>
<br>
<tt>void</tt><br>
<tt>vwarn(const char *</tt><em>format</em><tt>, va_list);</tt><br>
<br>
<tt>void</tt><br>
<tt>vwarnx(const char *</tt><em>format</em><tt>, va_list);</tt><br>
</p>
<h3>Description</h3>
<p>
The <tt>warn</tt>, <tt>warnx</tt>, <tt>vwarn</tt>, and <tt>vwarnx</tt>
functions print warning messages to the standard error stream.
</p>
<p>
<tt>warnx</tt> prints the name of the program, a colon, the text
generated by passing <em>format</em> and subsequent args through
<A HREF=printf.html>printf</A>, and a newline.
</p>
<p>
<tt>warn</tt> prints the same thing, except that a colon and the error
string for the current error (obtained by calling
<A HREF=strerror.html>strerror</A> on
<A HREF=../syscall/errno.html>errno</A>) are printed prior to the
newline.
</p>
<p>
<tt>vwarnx</tt> and <tt>vwarn</tt> are the same as <tt>warnx</tt> and
<tt>warn</tt> respectively, except that the additional arguments for
printf are taken to have been already packaged up in a
<tt>va_list</tt> by use of the <A HREF=stdarg.html>stdarg</A> facility.
</p>
<h3>See Also</h3>
<p>
<A HREF=err.html>err</A>
</p>
</body>
</html>