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src/util/os_mman.h

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+/**************************************************************************
+ *
+ * Copyright 2011 LunarG, Inc.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+
+/**
+ * @file
+ * OS independent memory mapping (with large file support).
+ *
+ * @author Chia-I Wu <[email protected]>
+ */
+
+#ifndef _OS_MMAN_H_
+#define _OS_MMAN_H_
+
+#include <assert.h>
+#include <stddef.h>
+
+#include "util/detect_os.h"
+
+#if DETECT_OS_POSIX
+#  include <sys/mman.h>
+#else
+#  error Unsupported OS
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+#if DETECT_OS_ANDROID && !defined(__LP64__)
+/* 32-bit needs mmap64 for 64-bit offsets */
+#  define os_mmap(addr, length, prot, flags, fd, offset) \
+             mmap64(addr, length, prot, flags, fd, offset)
+
+#  define os_munmap(addr, length) \
+             munmap(addr, length)
+
+#else
+/* assume large file support exists */
+#  define os_mmap(addr, length, prot, flags, fd, offset) \
+             mmap(addr, length, prot, flags, fd, offset)
+
+static inline int os_munmap(void *addr, size_t length)
+{
+   /* Copied from configure code generated by AC_SYS_LARGEFILE */
+#define LARGE_OFF_T ((((off_t) 1 << 31) << 31) - 1 + \
+                     (((off_t) 1 << 31) << 31))
+   static_assert(LARGE_OFF_T % 2147483629 == 721 &&
+                 LARGE_OFF_T % 2147483647 == 1, "");
+#undef LARGE_OFF_T
+
+   return munmap(addr, length);
+}
+#endif
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _OS_MMAN_H_ */