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sbrk
====

Syntax
------

     #include <unistd.h>
     
     void *sbrk(int delta)

Description
-----------

This function changes the "break" of the program by adding DELTA to it.
This is the highest address that your program can access without
causing a violation.  Since the heap is the region under the break, you
can expand the heap (where `malloc' gets memory from) by increasing the
break.

This function is normally accessed only bu `malloc' (malloc:.).   

Return Value
------------

The address of the first byte outside of the previous valid address
range, or -1 if no more memory could be accessed.  In other words, a
pointer to the chunk of heap you just allocated, if you had passed a
positive number.

Example
-------

     char *buf;
     buf = sbrk(1000); /* allocate space */