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| <h3 class="section">4.55 <code>setbuffer</code>—specify full buffering for a file or stream with size</h3> |
| |
| <p><a name="index-setbuffer-264"></a><strong>Synopsis</strong> |
| <pre class="example"> #include <stdio.h> |
| void setbuffer(FILE *<var>fp</var>, char *<var>buf</var>, int <var>size</var>); |
| |
| </pre> |
| <p><strong>Description</strong><br> |
| <code>setbuffer</code> specifies that output to the file or stream identified by |
| <var>fp</var> should be fully buffered. All output for this file will go to a |
| buffer (of size <var>size</var>). Output will be passed on to the host system |
| only when the buffer is full, or when an input operation intervenes. |
| |
| <p>You may, if you wish, supply your own buffer by passing a pointer to |
| it as the argument <var>buf</var>. It must have size <var>size</var>. You can |
| also use <code>NULL</code> as the value of <var>buf</var>, to signal that the |
| <code>setbuffer</code> function is to allocate the buffer. |
| |
| <p><br> |
| <strong>Warnings</strong><br> |
| You may only use <code>setbuffer</code> before performing any file operation |
| other than opening the file. |
| |
| <p>If you supply a non-null <var>buf</var>, you must ensure that the associated |
| storage continues to be available until you close the stream |
| identified by <var>fp</var>. |
| |
| <p><br> |
| <strong>Returns</strong><br> |
| <code>setbuffer</code> does not return a result. |
| |
| <p><br> |
| <strong>Portability</strong><br> |
| This function comes from BSD not ANSI or POSIX. |
| |
| <p>Supporting OS subroutines required: <code>close</code>, <code>fstat</code>, <code>isatty</code>, |
| <code>lseek</code>, <code>read</code>, <code>sbrk</code>, <code>write</code>. |
| |
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