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/*
* Copyright (c) 2001-2004 The Trustees of Indiana University.
* All rights reserved.
* Copyright (c) 1998-2001 University of Notre Dame.
* All rights reserved.
* Copyright (c) 1994-1998 The Ohio State University.
* All rights reserved.
*
* This file is part of the LAM/MPI software package. For license
* information, see the LICENSE file in the top level directory of the
* LAM/MPI source distribution.
*
* $HEADER$
*
* $Id: hook_functions.c,v 1.1 2003/06/18 03:02:48 jsquyres Exp $
*
* Function: - Hook functions for ptmalloc module used
* in gm RPI module
*/
#include <lam_config.h>
#include <malloc_wrapper.h>
#include <unistd.h>
#include <unistd.h>
#include <sys/mman.h>
#if LAM_WANT_PTMALLOC
/*
* Not all systems have sbrk() declared, since it's technically not a
* POSIX function.
*/
#if !LAM_HAVE_DECL_SBRK
void *sbrk();
#endif
/*
* Hook function that is invoked by ptmalloc for sbrk. When we sbrk()
* a negative number, need to go unregister any memory that may be in
* the region that we're letting go.
*/
void *
lam_ptmalloc_sbrk(int inc)
{
if (inc < 0) {
long oldp = (long) sbrk(0);
lam_handle_free((void*) (oldp + inc), -inc);
}
return sbrk(inc);
}
/*
* Same rationale as for sbrk(), above.
*/
int
lam_ptmalloc_munmap(void *start, size_t length)
{
lam_handle_free(start, length);
return munmap(start, length);
}
#endif /* LAM_WANT_PTMALLOC */
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