/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @brief Synchronize Data on Disk with Memory
* @ingroup libcsupport
*/
/*
* COPYRIGHT (c) 1989-2008.
* On-Line Applications Research Corporation (OAR).
*
* 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 <sys/reent.h>
#include <unistd.h>
#include <stdio.h>
#include <rtems.h>
#include <rtems/score/thread.h>
#include <rtems/score/percpu.h>
/* In Newlib this function is declared in a private header file */
int _fwalk_reent (struct _reent *, int (*)(struct _reent *, FILE *));
static int sync_wrapper(struct _reent *reent, FILE *f)
{
int fn = fileno(f);
(void) reent;
/*
* There is no way to report errors here. So this is a best-effort approach.
*/
(void) fsync(fn);
(void) fdatasync(fn);
return 0;
}
/* iterate over all FILE *'s for this thread */
static bool sync_per_thread(Thread_Control *t, void *arg)
{
struct _reent *current_reent;
struct _reent *this_reent;
/*
* The sync_wrapper() function will operate on the current thread's
* reent structure so we will temporarily use that.
*/
this_reent = t->libc_reent;
if ( this_reent ) {
Thread_Control *executing = _Thread_Get_executing();
current_reent = executing->libc_reent;
executing->libc_reent = this_reent;
_fwalk_reent (this_reent, sync_wrapper);
executing->libc_reent = current_reent;
}
return false;
}
/**
* This function operates by as follows:
* for all threads
* for all FILE *
* fsync()
* fdatasync()
*/
void sync(void)
{
/*
* Walk the one used initially by RTEMS.
*/
_fwalk_reent(_GLOBAL_REENT, sync_wrapper);
/*
* XXX Do we walk the one used globally by newlib?
* XXX Do we need the RTEMS global one?
*/
/*
* Now walk all the per-thread reentrancy structures.
*/
rtems_task_iterate(sync_per_thread, NULL);
}
