forked from Imagelibrary/rtems
e6a92f85ed
* libcsupport/src/sync.c: Add comment explaining why the return value from fsync() and fdatasync() is not checked.
102 lines
2.3 KiB
C
102 lines
2.3 KiB
C
/*
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* sync() - XXX ??? where is this defined
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*
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* This function operates by as follows:
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* for all threads
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* for all FILE *
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* fsync()
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* fdatasync()
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*
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* COPYRIGHT (c) 1989-2008.
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* On-Line Applications Research Corporation (OAR).
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.com/license/LICENSE.
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*
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* $Id$
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*/
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#if HAVE_CONFIG_H
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#include "config.h"
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#endif
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/* Since we compile with strict ANSI we need to undef it to get
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* prototypes for extensions
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*/
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#undef __STRICT_ANSI__
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int fdatasync(int); /* still not always prototyped */
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#include <unistd.h>
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#include <stdio.h>
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#include <rtems.h>
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/*
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#define __RTEMS_VIOLATE_KERNEL_VISIBILITY__
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#include <rtems/libio_.h>
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#include <rtems/seterr.h>
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*/
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/* XXX check standards -- Linux version appears to be void */
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void _fwalk(struct _reent *, void *);
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static void sync_wrapper(FILE *f)
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{
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int fn = fileno(f);
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/*
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* We are explicitly NOT checking the return values as it does not
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* matter if they succeed. We are just making a best faith attempt
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* at both and trusting that we were passed a good FILE pointer.
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*/
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fsync(fn);
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fdatasync(fn);
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}
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/* iterate over all FILE *'s for this thread */
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static void sync_per_thread(Thread_Control *t)
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{
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struct _reent *current_reent;
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struct _reent *this_reent;
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/*
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* The sync_wrapper() function will operate on the current thread's
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* reent structure so we will temporarily use that.
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*/
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this_reent = t->libc_reent;
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if ( this_reent ) {
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current_reent = _Thread_Executing->libc_reent;
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_Thread_Executing->libc_reent = this_reent;
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_fwalk (t->libc_reent, sync_wrapper);
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_Thread_Executing->libc_reent = current_reent;
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}
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}
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/*
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* _global_impure_ptr is not prototyped in any .h files.
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* We have to extern it here.
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*/
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extern struct _reent * const _global_impure_ptr __ATTRIBUTE_IMPURE_PTR__;
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void sync(void)
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{
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/*
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* Walk the one used initially by RTEMS.
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*/
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_fwalk(_global_impure_ptr, sync_wrapper);
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/*
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* XXX Do we walk the one used globally by newlib?
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* XXX Do we need the RTEMS global one?
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*/
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/*
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* Now walk all the per-thread reentrancy structures.
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*/
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rtems_iterate_over_all_threads(sync_per_thread);
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}
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