?? sbrk.c
字號:
/* sbrk.c -- allocate memory dynamically.
*
* Copyright (c) 1995 Cygnus Support
*
* The authors hereby grant permission to use, copy, modify, distribute,
* and license this software and its documentation for any purpose, provided
* that existing copyright notices are retained in all copies and that this
* notice is included verbatim in any distributions. No written agreement,
* license, or royalty fee is required for any of the authorized uses.
* Modifications to this software may be copyrighted by their authors
* and need not follow the licensing terms described here, provided that
* the new terms are clearly indicated on the first page of each file where
* they apply.
*/
#include <errno.h>
#include "glue.h"
#define RAMSIZE (caddr_t)0x80000
/*
* sbrk -- changes heap size size. Get nbytes more
* RAM. We just increment a pointer in what's
* left of memory on the board.
*/
char *
sbrk (nbytes)
int nbytes;
{
static long heap_ptr=_end;
char *base;
#ifdef debuglg
prs("[sbrk]\n");
#endif
base = heap_ptr;
heap_ptr += nbytes;
return base;
}
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