/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*/
/*
* Copyright (c) 2016 Gedare Bloom.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <rtems/posix/shmimpl.h>
int _POSIX_Shm_Object_create_from_heap(
POSIX_Shm_Object *shm_obj,
size_t size
)
{
void *p = calloc( 1, size ); /* get zero'd memory */
if ( p != NULL ) {
shm_obj->handle = p;
shm_obj->size = size;
} else {
errno = EIO;
}
return 0;
}
int _POSIX_Shm_Object_delete_from_heap( POSIX_Shm_Object *shm_obj )
{
/* zero out memory before releasing it. */
memset( shm_obj->handle, 0, shm_obj->size );
free( shm_obj->handle );
shm_obj->handle = NULL;
shm_obj->size = 0;
return 0;
}
int _POSIX_Shm_Object_resize_from_heap(
POSIX_Shm_Object *shm_obj,
size_t size
)
{
void *p;
int err = 0;
if ( size < shm_obj->size ) {
/* zero out if shrinking */
p = (void*)((uintptr_t)shm_obj->handle + (uintptr_t)size);
memset( p, 0, shm_obj->size - size );
}
p = realloc( shm_obj->handle, size );
if ( p != NULL ) {
shm_obj->handle = p;
if ( size > shm_obj->size ) {
/* initialize added memory */
memset( p, 0, size - shm_obj->size );
}
shm_obj->size = size;
} else {
err = EIO;
}
return err;
}
/* This is identical to _POSIX_Shm_Object_read_from_wkspace */
int _POSIX_Shm_Object_read_from_heap(
POSIX_Shm_Object *shm_obj,
void *buf,
size_t count
)
{
if ( shm_obj == NULL || shm_obj->handle == NULL )
return 0;
if ( shm_obj->size < count ) {
count = shm_obj->size;
}
memcpy( buf, shm_obj->handle, count );
return count;
}
/* This is identical to _POSIX_Shm_Object_mmap_from_wkspace */
void * _POSIX_Shm_Object_mmap_from_heap(
POSIX_Shm_Object *shm_obj,
size_t len,
int prot,
off_t off
)
{
if ( shm_obj == NULL || shm_obj->handle == NULL )
return 0;
/* This is already checked by mmap. Maybe make it a debug assert? */
if ( shm_obj->size < len + off ) {
return NULL;
}
return (char*)shm_obj->handle + off;
}
