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brk
===

Syntax
------

     #include <stdlib.h>
     
     int brk(void *ptr);

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

This function changes the *break* for the program.  This is the first
address that, if referenced, will cause a fault to occur.  The program
asks for more memory by specifying larger values for PTR.  Normally,
this is done transparently through the `malloc' function.

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

zero if the break was changed, -1 if not.  ERRNO is set to the error.

Example
-------

     if (brk(old_brk+1000))
       printf("no memory\n");