[3750995] | 1 | /** |
---|
| 2 | * @file |
---|
[bed55af] | 3 | * |
---|
[3750995] | 4 | * @brief Synchronize Data on Disk with Memory |
---|
| 5 | * @ingroup libcsupport |
---|
| 6 | */ |
---|
| 7 | |
---|
| 8 | /* |
---|
[d40da79b] | 9 | * COPYRIGHT (c) 1989-2008. |
---|
[bed55af] | 10 | * On-Line Applications Research Corporation (OAR). |
---|
| 11 | * |
---|
| 12 | * The license and distribution terms for this file may be |
---|
| 13 | * found in the file LICENSE in this distribution or at |
---|
[0eae36c7] | 14 | * http://www.rtems.com/license/LICENSE. |
---|
[bed55af] | 15 | */ |
---|
| 16 | |
---|
| 17 | #if HAVE_CONFIG_H |
---|
| 18 | #include "config.h" |
---|
| 19 | #endif |
---|
| 20 | |
---|
[07e9194e] | 21 | /* Since we compile with strict ANSI we need to undef it to get |
---|
| 22 | * prototypes for extensions |
---|
| 23 | */ |
---|
| 24 | #undef __STRICT_ANSI__ |
---|
| 25 | int fdatasync(int); /* still not always prototyped */ |
---|
| 26 | |
---|
| 27 | |
---|
[bed55af] | 28 | #include <unistd.h> |
---|
| 29 | #include <stdio.h> |
---|
| 30 | |
---|
| 31 | #include <rtems.h> |
---|
| 32 | /* |
---|
| 33 | #define __RTEMS_VIOLATE_KERNEL_VISIBILITY__ |
---|
| 34 | |
---|
| 35 | #include <rtems/libio_.h> |
---|
| 36 | #include <rtems/seterr.h> |
---|
| 37 | */ |
---|
| 38 | |
---|
| 39 | /* XXX check standards -- Linux version appears to be void */ |
---|
| 40 | void _fwalk(struct _reent *, void *); |
---|
| 41 | |
---|
[07e9194e] | 42 | |
---|
[bed55af] | 43 | static void sync_wrapper(FILE *f) |
---|
| 44 | { |
---|
| 45 | int fn = fileno(f); |
---|
| 46 | |
---|
[e6a92f8] | 47 | /* |
---|
| 48 | * We are explicitly NOT checking the return values as it does not |
---|
| 49 | * matter if they succeed. We are just making a best faith attempt |
---|
| 50 | * at both and trusting that we were passed a good FILE pointer. |
---|
| 51 | */ |
---|
[bed55af] | 52 | fsync(fn); |
---|
| 53 | fdatasync(fn); |
---|
| 54 | } |
---|
| 55 | |
---|
| 56 | /* iterate over all FILE *'s for this thread */ |
---|
| 57 | static void sync_per_thread(Thread_Control *t) |
---|
| 58 | { |
---|
[65fd5ae] | 59 | struct _reent *current_reent; |
---|
[336227d] | 60 | struct _reent *this_reent; |
---|
[bed55af] | 61 | |
---|
| 62 | /* |
---|
| 63 | * The sync_wrapper() function will operate on the current thread's |
---|
| 64 | * reent structure so we will temporarily use that. |
---|
| 65 | */ |
---|
[336227d] | 66 | this_reent = t->libc_reent; |
---|
| 67 | if ( this_reent ) { |
---|
[d566f33e] | 68 | Thread_Control *executing = _Thread_Get_executing(); |
---|
| 69 | current_reent = executing->libc_reent; |
---|
| 70 | executing->libc_reent = this_reent; |
---|
[336227d] | 71 | _fwalk (t->libc_reent, sync_wrapper); |
---|
[d566f33e] | 72 | executing->libc_reent = current_reent; |
---|
[336227d] | 73 | } |
---|
[bed55af] | 74 | } |
---|
| 75 | |
---|
[f73fc29] | 76 | /* |
---|
[d40da79b] | 77 | * _global_impure_ptr is not prototyped in any .h files. |
---|
[f73fc29] | 78 | * We have to extern it here. |
---|
| 79 | */ |
---|
[d40da79b] | 80 | extern struct _reent * const _global_impure_ptr __ATTRIBUTE_IMPURE_PTR__; |
---|
[f73fc29] | 81 | |
---|
[3750995] | 82 | /** |
---|
| 83 | * This function operates by as follows: |
---|
| 84 | * for all threads |
---|
| 85 | * for all FILE * |
---|
| 86 | * fsync() |
---|
| 87 | * fdatasync() |
---|
| 88 | */ |
---|
[fbb5097c] | 89 | void sync(void) |
---|
[bed55af] | 90 | { |
---|
[07e9194e] | 91 | |
---|
| 92 | /* |
---|
| 93 | * Walk the one used initially by RTEMS. |
---|
| 94 | */ |
---|
[d40da79b] | 95 | _fwalk(_global_impure_ptr, sync_wrapper); |
---|
[07e9194e] | 96 | |
---|
| 97 | /* |
---|
| 98 | * XXX Do we walk the one used globally by newlib? |
---|
| 99 | * XXX Do we need the RTEMS global one? |
---|
| 100 | */ |
---|
| 101 | |
---|
| 102 | /* |
---|
| 103 | * Now walk all the per-thread reentrancy structures. |
---|
| 104 | */ |
---|
[bed55af] | 105 | rtems_iterate_over_all_threads(sync_per_thread); |
---|
| 106 | } |
---|