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[/] [or1k/] [branches/] [oc/] [gdb-5.0/] [mmalloc/] [detach.c] - Blame information for rev 1781

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1 106 markom
/* Finish access to a mmap'd malloc managed region.
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   Copyright 1992 Free Software Foundation, Inc.
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   Contributed by Fred Fish at Cygnus Support.   fnf@cygnus.com
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB.  If
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not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA.  */
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#include <sys/types.h>
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#include "mmprivate.h"
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/* Terminate access to a mmalloc managed region by unmapping all memory pages
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   associated with the region, and closing the file descriptor if it is one
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   that we opened.
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   Returns NULL on success.
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   Returns the malloc descriptor on failure, which can subsequently be used
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   for further action, such as obtaining more information about the nature of
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   the failure by examining the preserved errno value.
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   Note that the malloc descriptor that we are using is currently located in
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   region we are about to unmap, so we first make a local copy of it on the
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   stack and use the copy. */
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PTR
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mmalloc_detach (md)
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     PTR md;
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{
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  struct mdesc mtemp;
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  if (md != NULL)
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    {
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      mtemp = *(struct mdesc *) md;
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      /* Now unmap all the pages associated with this region by asking for a
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         negative increment equal to the current size of the region. */
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      if ((mtemp.morecore (&mtemp, mtemp.base - mtemp.breakval)) == NULL)
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        {
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          /* Deallocating failed.  Update the original malloc descriptor
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             with any changes */
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          *(struct mdesc *) md = mtemp;
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        }
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      else
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        {
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          if (mtemp.flags & MMALLOC_DEVZERO)
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            {
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              close (mtemp.fd);
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            }
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          md = NULL;
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        }
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    }
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  return (md);
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}

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