ee82304211
This patch implements the _sbrk_r() system call for Galileo platform. This system call is required by newlib's malloc() implementation. Next patch will introduce the initial support for stdio library which requires a working malloc() function for proper operation. We are not sure about the heap size we should use. Preliminary tests have shown that stdio library requests 1032 bytes heap. So, as an initial guess, a 2Kb heap size should be enough for now.
120 lines
3.6 KiB
C
120 lines
3.6 KiB
C
/*
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* Copyright (C) 2015, Intel Corporation. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/stat.h>
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#include <errno.h>
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#define HEAP_MAX_SIZE 2048
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static char _heap[HEAP_MAX_SIZE];
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static char *prog_break = _heap;
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int
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_close_r(struct _reent *ptr, int file)
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{
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/* Stubbed function */
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ptr->_errno = ENOTSUP;
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return -1;
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}
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/*---------------------------------------------------------------------------*/
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int
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_isatty_r(struct _reent *ptr, int file)
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{
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/* Stubbed function */
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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int
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_read_r(struct _reent *ptr, int file, char *buf, int len)
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{
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/* Stubbed function */
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ptr->_errno = ENOTSUP;
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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int
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_write_r(struct _reent *ptr, int file, const char *buf, int len)
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{
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/* Stubbed function */
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ptr->_errno = ENOTSUP;
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return -1;
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}
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/*---------------------------------------------------------------------------*/
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int
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_lseek_r(struct _reent *ptr, int file, int p, int dir)
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{
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/* Stubbed function */
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ptr->_errno = ENOTSUP;
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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int
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_fstat_r(struct _reent *ptr, int file, struct stat *st)
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{
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/* Stubbed function */
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ptr->_errno = ENOTSUP;
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return -1;
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}
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/*---------------------------------------------------------------------------*/
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caddr_t
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_sbrk_r(struct _reent *ptr, int incr)
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{
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char *prev_prog_break;
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/* If the new program break overruns the maximum heap address, we return
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* "Out of Memory" error to the user.
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*/
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if(prog_break + incr > _heap + HEAP_MAX_SIZE) {
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ptr->_errno = ENOMEM;
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return NULL;
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}
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prev_prog_break = prog_break;
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prog_break += incr;
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return prev_prog_break;
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}
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/*---------------------------------------------------------------------------*/
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void
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_kill_r(struct _reent *ptr)
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{
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/* Stubbed function */
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ptr->_errno = ENOTSUP;
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}
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/*---------------------------------------------------------------------------*/
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int
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_getpid_r(struct _reent *ptr)
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{
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/* Stubbed function */
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ptr->_errno = ENOTSUP;
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return 1;
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}
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