usr/src/lib/libc/vax/sys/brk.c

/*
 * Copyright (c) 1983 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

#ifdef SYSLIBC_SCCS
_sccsid:.asciz  "@(#)brk.c      5.3 (Berkeley) 3/9/86"
#endif SYSLIBC_SCCS

#include "SYS.h"

#define SYS_brk         17

        .globl  curbrk
        .globl  minbrk
ENTRY(_brk)
        jbr     ok

ENTRY(brk)
        cmpl    4(ap),minbrk
        bgeq    ok
        movl    minbrk,4(ap)
ok:
        chmk    $SYS_brk
        jcs     err
        movl    4(ap),curbrk
        clrl    r0
        ret
err:
        jmp     cerror