Date: Mon, 13 Oct 1997 07:02:48 -0400 (GMT-0400) From: Snob Art Genre <ben@multivac.narcissus.net> To: Doug White <dwhite@resnet.uoregon.edu> Cc: Jason Alan Nordwick <nordwick@graft.xcf.berkeley.edu>, questions@FreeBSD.ORG Subject: Re: more kernel/libc questions. Message-ID: <Pine.NXT.3.96.971013070040.3179B-100000@multivac.narcissus.net> In-Reply-To: <Pine.BSF.3.96.971012233913.9609T-100000@gdi.uoregon.edu>
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On Sun, 12 Oct 1997, Doug White wrote:
> This bit on the brk(2) man page implies to me that they don't do anything
> useful:
% uname -a
FreeBSD thorazine.neuron.net 2.2-STABLE FreeBSD 2.2-STABLE #0: Sun Aug 31
15:20:36 EDT 1997
root@thorazine.neuron.net:/usr/src/sys/compile/THORAZINE i386
% grep brk /usr/src/lib/libc/stdlib/malloc.c
static void *malloc_brk;
result = (caddr_t)pageround((u_long)sbrk(0));
if (brk(tail)) {
malloc_brk = tail;
malloc_origo = ((u_long)pageround((u_long)sbrk(0))) >>
malloc_pageshift;
* We can sbrk(2) further back when we keep this on a low address.
if ((void*)pf->page >= (void*)sbrk(0))
wrterror("(ES): entry on free_list past brk\n");
pf->end == malloc_brk && /* ..and none behind us,*/
malloc_brk == sbrk(0)) { /* ..and it's OK to do...*/
brk(pf->end);
malloc_brk = pf->end;
> Doug White | University of Oregon
> Internet: dwhite@resnet.uoregon.edu | Residence Networking Assistant
> http://gladstone.uoregon.edu/~dwhite | Computer Science Major
Ben
"You have your mind on computers, it seems."
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