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<html>
<head>
<title>EAGLE Help: fileerror()</title>
</head>
<body bgcolor=white>
<font face=Helvetica,Arial>
<hr>
<i>EAGLE Help</i>
<h1><center>fileerror()</center></h1>
<hr>
<dl>
<dt>
<b>Function</b>
<dd>
Returns the status of I/O operations.
<p>
<dt>
<b>Syntax</b>
<dd>
<tt>int fileerror();</tt>
<p>
<dt>
<b>Returns</b>
<dd>
The <tt>fileerror</tt> function returns <tt>0</tt> if everything is ok.
<p>
<dt>
<b>Description</b>
<dd>
<tt>fileerror</tt> checks the status of any I/O operations that have been performed
since the last call to this function and returns <tt>0</tt> if everything was ok.
If any of the I/O operations has caused an error, a value other than <tt>0</tt>
will be returned.
<p>
You should call <tt>fileerror</tt> before any I/O operations to reset any previous
error state, and call it again after the I/O operations to see if they were successful.
<p>
When <tt>fileerror</tt> returns a value other than <tt>0</tt> (thus indicating an error)
a proper error message has already been given to the user.
</dl>
<b>See also</b> <a href=277.htm>output</a>,
<a href=255.htm>printf</a>,
<a href=240.htm>fileread</a>
<p>
<b>Example</b>
<pre>
fileerror();
output("file.txt", "wt") {
printf("Test\n");
}
if (fileerror())
exit(1);
</pre>
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