/* Support for an sbrk-like function that uses mmap.
Copyright 1992, 2000 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.
+/* Copyright (c) 2010. The SimGrid Team.
+ * All rights reserved. */
-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
-published by the Free Software Foundation; either version 2 of the
-License, or (at your option) any later version.
+/* This program is free software; you can redistribute it and/or modify it
+ * under the terms of the license (GNU LGPL) which comes with this package. */
-The GNU C Library 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
-Library General Public License for more details.
-
-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
-not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA. */
-
-#if defined(HAVE_MMAP)
+#ifndef MAP_ANONYMOUS
+ #define MAP_ANONYMOUS MAP_ANON
+#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h> /* Prototypes for lseek */
static size_t pagesize;
#if NEED_DECLARATION_GETPAGESIZE
-extern int getpagesize PARAMS ((void));
+extern int getpagesize (void);
#endif
-#define PAGE_ALIGN(addr) (PTR) (((long)(addr) + pagesize - 1) & \
+#define PAGE_ALIGN(addr) (void*) (((long)(addr) + pagesize - 1) & \
~(pagesize - 1))
/* Return MAP_PRIVATE if MDP represents /dev/zero. Otherwise, return
MAP_SHARED. */
-#define MAP_PRIVATE_OR_SHARED(MDP) ((MDP -> flags & MMALLOC_DEVZERO) \
+#define MAP_PRIVATE_OR_SHARED(MDP) (( MDP -> flags & MMALLOC_ANONYMOUS) \
? MAP_PRIVATE \
: MAP_SHARED)
amount to either add to or subtract from the existing region. Works
like sbrk(), but using mmap(). */
-PTR
-__mmalloc_mmap_morecore (mdp, size)
- struct mdesc *mdp;
- int size;
+void*
+__mmalloc_mmap_morecore (struct mdesc *mdp, int size)
{
- PTR result = NULL;
+ void* result = NULL;
off_t foffset; /* File offset at which new mapping will start */
size_t mapbytes; /* Number of bytes to map */
- PTR moveto; /* Address where we wish to move "break value" to */
- PTR mapto; /* Address we actually mapped to */
+ void* moveto; /* Address where we wish to move "break value" to */
+ void* mapto; /* Address we actually mapped to */
char buf = 0; /* Single byte to write to extend mapped file */
if (pagesize == 0)
us to try to deallocate back past the base of the mmap'd region
then do nothing, and return NULL. Otherwise, deallocate the
memory and return the old break value. */
- if (mdp -> breakval + size >= mdp -> base)
+ if (((char*)mdp -> breakval) + size >= (char*)mdp -> base)
{
- result = (PTR) mdp -> breakval;
- mdp -> breakval += size;
+ result = (void*) mdp -> breakval;
+ mdp -> breakval = (char*) mdp->breakval + size;
moveto = PAGE_ALIGN (mdp -> breakval);
- munmap (moveto, (size_t) (mdp -> top - moveto) - 1);
+ munmap (moveto, (size_t) (((char*)mdp -> top) - ((char*)moveto)) - 1);
mdp -> top = moveto;
}
}
{
result = NULL;
}
- else if (mdp -> breakval + size > mdp -> top)
+ else if ((char*)mdp -> breakval + size > (char*)mdp -> top)
{
/* The request would move us past the end of the currently
mapped memory, so map in enough more memory to satisfy
the request. This means we also have to grow the mapped-to
file by an appropriate amount, since mmap cannot be used
to extend a file. */
- moveto = PAGE_ALIGN (mdp -> breakval + size);
- mapbytes = moveto - mdp -> top;
- foffset = mdp -> top - mdp -> base;
+ moveto = PAGE_ALIGN ((char*)mdp -> breakval + size);
+ mapbytes = (char*)moveto - (char*)mdp -> top;
+ foffset = (char*)mdp -> top - (char*)mdp -> base;
if( mdp -> fd > 0){
/* FIXME: Test results of lseek() and write() */
MAP_PRIVATE_OR_SHARED(mdp) | MAP_IS_ANONYMOUS(mdp) | MAP_FIXED,
MAP_ANON_OR_FD(mdp), foffset);
- if (mapto != (PTR) -1){
+ if (mapto != (void*) -1){
if(mdp -> top == 0)
mdp -> base = mdp -> breakval = mapto;
- mdp -> top = PAGE_ALIGN (mdp -> breakval + size);
- result = (PTR) mdp -> breakval;
- mdp -> breakval += size;
+ mdp -> top = PAGE_ALIGN ((char*)mdp -> breakval + size);
+ result = (void*) mdp -> breakval;
+ mdp -> breakval = (char*)mdp->breakval + size;
}
}
else
{
- result = (PTR) mdp -> breakval;
- mdp -> breakval += size;
+ result = (void*) mdp -> breakval;
+ mdp -> breakval = (char*)mdp->breakval + size;
}
}
return (result);
}
-PTR
-__mmalloc_remap_core (mdp)
- struct mdesc *mdp;
+void*
+__mmalloc_remap_core (struct mdesc *mdp)
{
- PTR base;
+ void* base;
/* FIXME: Quick hack, needs error checking and other attention. */
- base = mmap (mdp -> base, mdp -> top - mdp -> base,
+ base = mmap (mdp -> base, (char*)mdp -> top - (char*)mdp -> base,
PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE_OR_SHARED (mdp) | MAP_FIXED,
mdp -> fd, 0);
- return ((PTR) base);
+ return ((void*) base);
}
-PTR
-mmalloc_findbase (size)
- int size;
+void*
+mmalloc_findbase (int size)
{
int fd;
int flags;
- PTR base = NULL;
+ void* base = NULL;
#ifdef MAP_ANONYMOUS
flags = MAP_PRIVATE | MAP_ANONYMOUS;
fd = open ("/dev/zero", O_RDWR);
if (fd != -1)
{
- return ((PTR) NULL);
+ return ((void*) NULL);
}
#endif
base = mmap (0, size, PROT_READ | PROT_WRITE, flags, fd, 0);
- if (base != (PTR) -1)
+ if (base != (void*) -1)
{
munmap (base, (size_t) size);
}
to signal an error return, and besides, it is useful to
catch NULL pointers if it is unmapped. Instead start
at the next page boundary. */
- base = (PTR) getpagesize ();
+ base = (void*) getpagesize ();
}
- else if (base == (PTR) -1)
+ else if (base == (void*) -1)
{
base = NULL;
}
- return ((PTR) base);
+ return ((void*) base);
}
-
-#else /* defined(HAVE_MMAP) */
-/* Prevent "empty translation unit" warnings from the idiots at X3J11. */
-//static char ansi_c_idiots = 69;
-#endif /* defined(HAVE_MMAP) */
