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/* vim: set sw=8: -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
* gsf-shared-memory.c:
*
* Copyright (C) 2002-2006 Morten Welinder (terra@diku.dk)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2.1 of the GNU Lesser General Public
* License as published by the Free Software Foundation.
*
* 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
* USA
*/
#include <gsf-config.h>
#include <gsf/gsf-shared-memory.h>
#include <gsf/gsf.h>
#ifdef HAVE_MMAP
#include <sys/types.h>
#include <sys/mman.h>
#elif defined(G_OS_WIN32)
#include <windows.h>
#endif
typedef struct {
GObjectClass g_object_class;
} GsfSharedMemoryClass;
static GObjectClass *parent_class;
GsfSharedMemory *
gsf_shared_memory_new (void *buf, gsf_off_t size, gboolean needs_free)
{
GsfSharedMemory *mem = g_object_new (GSF_SHARED_MEMORY_TYPE, NULL);
mem->buf = buf;
mem->size = size;
mem->needs_free = needs_free;
mem->needs_unmap = FALSE;
return mem;
}
GsfSharedMemory *
gsf_shared_memory_mmapped_new (void *buf, gsf_off_t size)
{
#if defined(HAVE_MMAP) || defined(G_OS_WIN32)
size_t msize = size;
if ((gsf_off_t)msize != size) {
g_warning ("memory buffer size too large");
return NULL;
} else {
GsfSharedMemory *mem = gsf_shared_memory_new (buf, size, FALSE);
mem->needs_unmap = TRUE;
return mem;
}
#else
return NULL;
#endif
}
static void
gsf_shared_memory_finalize (GObject *obj)
{
GsfSharedMemory *mem = (GsfSharedMemory *) (obj);
if (mem->buf != NULL) {
if (mem->needs_free)
g_free (mem->buf);
else if (mem->needs_unmap) {
#ifdef HAVE_MMAP
munmap (mem->buf, mem->size);
#elif defined(G_OS_WIN32)
UnmapViewOfFile (mem->buf);
#else
g_assert_not_reached ();
#endif
}
}
G_OBJECT_CLASS (parent_class)->finalize (obj);
}
static void
gsf_shared_memory_init (GObject *obj)
{
GsfSharedMemory *mem = (GsfSharedMemory *) (obj);
mem->buf = NULL;
}
static void
gsf_shared_memory_class_init (GObjectClass *gobject_class)
{
parent_class = g_type_class_peek_parent (gobject_class);
gobject_class->finalize = gsf_shared_memory_finalize;
}
GSF_CLASS (GsfSharedMemory, gsf_shared_memory,
gsf_shared_memory_class_init, gsf_shared_memory_init,
G_TYPE_OBJECT)
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