/* Finish access to a mmap'd malloc managed region.
|
/* Finish access to a mmap'd malloc managed region.
|
Copyright 1992 Free Software Foundation, Inc.
|
Copyright 1992 Free Software Foundation, Inc.
|
|
|
Contributed by Fred Fish at Cygnus Support. fnf@cygnus.com
|
Contributed by Fred Fish at Cygnus Support. fnf@cygnus.com
|
|
|
This file is part of the GNU C Library.
|
This file is part of the GNU C Library.
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
The GNU C Library is free software; you can redistribute it and/or
|
modify it under the terms of the GNU Library General Public License as
|
modify it under the terms of the GNU Library General Public License as
|
published by the Free Software Foundation; either version 2 of the
|
published by the Free Software Foundation; either version 2 of the
|
License, or (at your option) any later version.
|
License, or (at your option) any later version.
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
The GNU C Library is distributed in the hope that it will be useful,
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
Library General Public License for more details.
|
Library General Public License for more details.
|
|
|
You should have received a copy of the GNU Library General Public
|
You should have received a copy of the GNU Library General Public
|
License along with the GNU C Library; see the file COPYING.LIB. If
|
License along with the GNU C Library; see the file COPYING.LIB. If
|
not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
Boston, MA 02111-1307, USA. */
|
Boston, MA 02111-1307, USA. */
|
|
|
#include <sys/types.h>
|
#include <sys/types.h>
|
#include "mmprivate.h"
|
#include "mmprivate.h"
|
|
|
/* Terminate access to a mmalloc managed region by unmapping all memory pages
|
/* Terminate access to a mmalloc managed region by unmapping all memory pages
|
associated with the region, and closing the file descriptor if it is one
|
associated with the region, and closing the file descriptor if it is one
|
that we opened.
|
that we opened.
|
|
|
Returns NULL on success.
|
Returns NULL on success.
|
|
|
Returns the malloc descriptor on failure, which can subsequently be used
|
Returns the malloc descriptor on failure, which can subsequently be used
|
for further action, such as obtaining more information about the nature of
|
for further action, such as obtaining more information about the nature of
|
the failure by examining the preserved errno value.
|
the failure by examining the preserved errno value.
|
|
|
Note that the malloc descriptor that we are using is currently located in
|
Note that the malloc descriptor that we are using is currently located in
|
region we are about to unmap, so we first make a local copy of it on the
|
region we are about to unmap, so we first make a local copy of it on the
|
stack and use the copy. */
|
stack and use the copy. */
|
|
|
PTR
|
PTR
|
mmalloc_detach (md)
|
mmalloc_detach (md)
|
PTR md;
|
PTR md;
|
{
|
{
|
struct mdesc mtemp;
|
struct mdesc mtemp;
|
|
|
if (md != NULL)
|
if (md != NULL)
|
{
|
{
|
|
|
mtemp = *(struct mdesc *) md;
|
mtemp = *(struct mdesc *) md;
|
|
|
/* Now unmap all the pages associated with this region by asking for a
|
/* Now unmap all the pages associated with this region by asking for a
|
negative increment equal to the current size of the region. */
|
negative increment equal to the current size of the region. */
|
|
|
if ((mtemp.morecore (&mtemp, mtemp.base - mtemp.breakval)) == NULL)
|
if ((mtemp.morecore (&mtemp, mtemp.base - mtemp.breakval)) == NULL)
|
{
|
{
|
/* Deallocating failed. Update the original malloc descriptor
|
/* Deallocating failed. Update the original malloc descriptor
|
with any changes */
|
with any changes */
|
*(struct mdesc *) md = mtemp;
|
*(struct mdesc *) md = mtemp;
|
}
|
}
|
else
|
else
|
{
|
{
|
if (mtemp.flags & MMALLOC_DEVZERO)
|
if (mtemp.flags & MMALLOC_DEVZERO)
|
{
|
{
|
close (mtemp.fd);
|
close (mtemp.fd);
|
}
|
}
|
md = NULL;
|
md = NULL;
|
}
|
}
|
}
|
}
|
|
|
return (md);
|
return (md);
|
}
|
}
|
|
|
