rtems/posix/mmanimpl.h

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  * @file
0005  *
0006  * @brief Internal Support for POSIX 1003.1b 6.3.1 - map pages of memory
0007  *
0008  */
0009
0010 /*
0011  * Copyright (c) 2012 Chris Johns
0012  *
0013  * Redistribution and use in source and binary forms, with or without
0014  * modification, are permitted provided that the following conditions
0015  * are met:
0016  * 1. Redistributions of source code must retain the above copyright
0017  *    notice, this list of conditions and the following disclaimer.
0018  * 2. Redistributions in binary form must reproduce the above copyright
0019  *    notice, this list of conditions and the following disclaimer in the
0020  *    documentation and/or other materials provided with the distribution.
0021  *
0022  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0023  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0024  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0025  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0026  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0027  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0028  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0029  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0030  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0031  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0032  * POSSIBILITY OF SUCH DAMAGE.
0033  */
0034
0035 #ifndef _RTEMS_POSIX_MMANIMPL_H
0036 #define _RTEMS_POSIX_MMANIMPL_H
0037
0038 #include <rtems/libio_.h>
0039 #include <rtems/chain.h> /* FIXME: use score chains for proper layering? */
0040 #include <rtems/posix/shm.h>
0041
0042 #ifdef __cplusplus
0043 extern "C" {
0044 #endif
0045
0046 /* FIXME: add Doxygen */
0047
0048 /**
0049  * Every mmap'ed region has a mapping.
0050  */
0051 typedef struct mmap_mappings_s {
0052   rtems_chain_node   node;  /**< The mapping chain's node */
0053   void*              addr;  /**< The address of the mapped memory */
0054   size_t             len;   /**< The length of memory mapped */
0055   int                flags; /**< The mapping flags */
0056   POSIX_Shm_Control *shm;   /**< The shared memory object or NULL */
0057 } mmap_mapping;
0058
0059 extern rtems_chain_control mmap_mappings;
0060
0061 static inline void mmap_mappings_lock_obtain( void )
0062 {
0063   rtems_libio_lock();
0064 }
0065
0066 static inline void mmap_mappings_lock_release( void )
0067 {
0068   rtems_libio_unlock();
0069 }
0070
0071 #ifdef __cplusplus
0072 }
0073 #endif
0074
0075 #endif