[moira.git] / server / mr_sbrk.c

/*
 *	$Source$
 *	$Author$
 *	$Header$
 *
 *	Copyright (C) 1987 by the Massachusetts Institute of Technology
 *	For copying and distribution information, please see the file
 *	<mit-copyright.h>.
 */

#ifndef lint
static char *rcsid_sms_sbrk_c = "$Header$";
#endif lint

#include <mit-copyright.h>

/*
 * The following routine is a kludge around a deficiency in the Ingres
 * memory allocator; it likes to call sbrk(0) a lot to check on the
 * amount of memory allocated.
 */
#include <sys/types.h>

#ifdef vax
extern char end;
asm("	.data");
asm("  	.globl	curbrk");
asm("	.globl	minbrk");
asm("_curbrk:");
asm("curbrk:	.long	_end");
asm("_minbrk:");
asm("minbrk:	.long	_end");
    
extern caddr_t curbrk;
extern caddr_t minbrk;

caddr_t sbrk(incr)
	register int incr;
{
	register caddr_t oldbrk = curbrk;
	if (incr) {
		if (brk(oldbrk + incr) < 0)
			return (caddr_t)-1;
		curbrk += incr;
	}	
	return oldbrk;
}
#endif vax

/*
 * Local Variables:
 * mode: c
 * c-indent-level: 4
 * c-continued-statement-offset: 4
 * c-brace-offset: -4
 * c-argdecl-indent: 4
 * c-label-offset: -4
 * End:
 */
Commit	Line	Data
349e85df	1	/*
	2	* $Source$
	3	* $Author$
	4	* $Header$
	5	*
	6	* Copyright (C) 1987 by the Massachusetts Institute of Technology
c801de4c	7	* For copying and distribution information, please see the file
c801de4c	8	* <mit-copyright.h>.
349e85df	9	*/
	10
	11	#ifndef lint
	12	static char *rcsid_sms_sbrk_c = "$Header$";
	13	#endif lint
	14
c801de4c	15	#include <mit-copyright.h>
c801de4c	16
349e85df	17	/*
	18	* The following routine is a kludge around a deficiency in the Ingres
	19	* memory allocator; it likes to call sbrk(0) a lot to check on the
	20	* amount of memory allocated.
	21	*/
	22	#include <sys/types.h>
	23
	24	#ifdef vax
	25	extern char end;
	26	asm(" .data");
	27	asm(" .globl curbrk");
	28	asm(" .globl minbrk");
	29	asm("_curbrk:");
	30	asm("curbrk: .long _end");
	31	asm("_minbrk:");
	32	asm("minbrk: .long _end");
	33
	34	extern caddr_t curbrk;
	35	extern caddr_t minbrk;
	36
	37	caddr_t sbrk(incr)
	38	register int incr;
	39	{
	40	register caddr_t oldbrk = curbrk;
	41	if (incr) {
	42	if (brk(oldbrk + incr) < 0)
	43	return (caddr_t)-1;
	44	curbrk += incr;
	45	}
	46	return oldbrk;
	47	}
	48	#endif vax
	49
	50	/*
	51	* Local Variables:
	52	* mode: c
	53	* c-indent-level: 4
	54	* c-continued-statement-offset: 4
	55	* c-brace-offset: -4
	56	* c-argdecl-indent: 4
	57	* c-label-offset: -4
	58	* End:
	59	*/