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