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Linux系统调用

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<TITLE>Syscall specifications of Linux - brk</TITLE>
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<H2><A NAME="SEC37" HREF="syscalls_toc.html#SEC37" tppabs="http://personal.xfol.com/%7erezaie/syscall/syscalls_toc.html#SEC37">brk</A></H2>
<P>
<H3>SYNOPSIS</H3>
<P>
<CODE>int brk(void *<VAR>end_data_segment</VAR>);</CODE>
<P>
<H3>PARAMETERS</H3>
<P>
<VAR>end_data_segment</VAR>: [in] the new end of the data segment.
<P>
<H3>DESCRIPTION</H3>
<P>
<CODE>brk</CODE> sets the end of the data segment to the value specified by
<VAR>end_data_segment</VAR>. This value must be greater than the end
of the text segment and lower than 16KB before the end of the stack.
<P>
Note: the brk syscall is in never called directly. It is wrapped by a
libc function that changes the return value. The sbrk fucntion is also
implemented as a wrapper.
<P>
<H3>RETURN VALUE</H3>
<P>
Returns the new end of the data segment. (If it is not equal the the
requested end, then there has been an error and the memory couldn't be
allocated.)
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