13b33d2b0a
* attach.c, mcalloc.c, mfree.c, mmalloc.c, mmalloc.h, mmap-sup.c, mmcheck.c, mtrace.c, mrealloc.c, mvalloc.c, sbrk-sup.c: Lint.
69 lines
2.1 KiB
C
69 lines
2.1 KiB
C
/* Support for sbrk() regions.
|
|
Copyright 1992 Free Software Foundation, Inc.
|
|
Contributed by Fred Fish at Cygnus Support. fnf@cygnus.com
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
|
|
|
|
|
|
#include <string.h> /* Prototypes for memcpy, memmove, memset, etc */
|
|
|
|
#include "mmalloc.h"
|
|
|
|
extern PTR sbrk ();
|
|
|
|
/* The mmalloc() package can use a single implicit malloc descriptor
|
|
for mmalloc/mrealloc/mfree operations which do not supply an explicit
|
|
descriptor. For these operations, sbrk() is used to obtain more core
|
|
from the system, or return core. This allows mmalloc() to provide
|
|
backwards compatibility with the non-mmap'd version. */
|
|
|
|
struct mdesc *__mmalloc_default_mdp;
|
|
|
|
/* Use sbrk() to get more core. */
|
|
|
|
static PTR
|
|
sbrk_morecore (mdp, size)
|
|
struct mdesc *mdp;
|
|
int size;
|
|
{
|
|
PTR result;
|
|
|
|
if ((result = sbrk (size)) != NULL)
|
|
{
|
|
mdp -> breakval += size;
|
|
mdp -> top += size;
|
|
}
|
|
return (result);
|
|
}
|
|
|
|
/* Initialize the default malloc descriptor if this is the first time
|
|
a request has been made to use the default sbrk'd region. */
|
|
|
|
struct mdesc *
|
|
__mmalloc_sbrk_init ()
|
|
{
|
|
PTR base;
|
|
|
|
base = sbrk (0);
|
|
__mmalloc_default_mdp = (struct mdesc *) sbrk (sizeof (struct mdesc));
|
|
(void) memset ((char *) __mmalloc_default_mdp, 0, sizeof (struct mdesc));
|
|
__mmalloc_default_mdp -> morecore = sbrk_morecore;
|
|
__mmalloc_default_mdp -> base = base;
|
|
__mmalloc_default_mdp -> breakval = __mmalloc_default_mdp -> top = sbrk (0);
|
|
__mmalloc_default_mdp -> fd = -1;
|
|
return (__mmalloc_default_mdp);
|
|
}
|
|
|
|
|