[3750995] | 1 | /** |
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| 2 | * @file |
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[bed55af] | 3 | * |
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[3750995] | 4 | * @brief Synchronize Data on Disk with Memory |
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| 5 | * @ingroup libcsupport |
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| 6 | */ |
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| 7 | |
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| 8 | /* |
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[d40da79b] | 9 | * COPYRIGHT (c) 1989-2008. |
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[bed55af] | 10 | * On-Line Applications Research Corporation (OAR). |
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| 11 | * |
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| 12 | * The license and distribution terms for this file may be |
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| 13 | * found in the file LICENSE in this distribution or at |
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[c499856] | 14 | * http://www.rtems.org/license/LICENSE. |
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[bed55af] | 15 | */ |
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| 16 | |
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| 17 | #if HAVE_CONFIG_H |
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| 18 | #include "config.h" |
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| 19 | #endif |
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| 20 | |
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[07e9194e] | 21 | /* Since we compile with strict ANSI we need to undef it to get |
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| 22 | * prototypes for extensions |
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| 23 | */ |
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| 24 | #undef __STRICT_ANSI__ |
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| 25 | int fdatasync(int); /* still not always prototyped */ |
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| 26 | |
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| 27 | |
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[bed55af] | 28 | #include <unistd.h> |
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| 29 | #include <stdio.h> |
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| 30 | |
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| 31 | #include <rtems.h> |
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| 32 | |
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| 33 | /* XXX check standards -- Linux version appears to be void */ |
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| 34 | void _fwalk(struct _reent *, void *); |
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| 35 | |
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[07e9194e] | 36 | |
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[bed55af] | 37 | static void sync_wrapper(FILE *f) |
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| 38 | { |
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| 39 | int fn = fileno(f); |
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| 40 | |
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[e6a92f8] | 41 | /* |
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| 42 | * We are explicitly NOT checking the return values as it does not |
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| 43 | * matter if they succeed. We are just making a best faith attempt |
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| 44 | * at both and trusting that we were passed a good FILE pointer. |
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| 45 | */ |
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[bed55af] | 46 | fsync(fn); |
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| 47 | fdatasync(fn); |
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| 48 | } |
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| 49 | |
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| 50 | /* iterate over all FILE *'s for this thread */ |
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| 51 | static void sync_per_thread(Thread_Control *t) |
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| 52 | { |
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[65fd5ae] | 53 | struct _reent *current_reent; |
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[336227d] | 54 | struct _reent *this_reent; |
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[bed55af] | 55 | |
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| 56 | /* |
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| 57 | * The sync_wrapper() function will operate on the current thread's |
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| 58 | * reent structure so we will temporarily use that. |
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| 59 | */ |
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[336227d] | 60 | this_reent = t->libc_reent; |
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| 61 | if ( this_reent ) { |
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[d566f33e] | 62 | Thread_Control *executing = _Thread_Get_executing(); |
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| 63 | current_reent = executing->libc_reent; |
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| 64 | executing->libc_reent = this_reent; |
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[336227d] | 65 | _fwalk (t->libc_reent, sync_wrapper); |
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[d566f33e] | 66 | executing->libc_reent = current_reent; |
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[336227d] | 67 | } |
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[bed55af] | 68 | } |
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| 69 | |
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[f73fc29] | 70 | /* |
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[d40da79b] | 71 | * _global_impure_ptr is not prototyped in any .h files. |
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[f73fc29] | 72 | * We have to extern it here. |
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| 73 | */ |
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[d40da79b] | 74 | extern struct _reent * const _global_impure_ptr __ATTRIBUTE_IMPURE_PTR__; |
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[f73fc29] | 75 | |
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[3750995] | 76 | /** |
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| 77 | * This function operates by as follows: |
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| 78 | * for all threads |
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| 79 | * for all FILE * |
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| 80 | * fsync() |
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| 81 | * fdatasync() |
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| 82 | */ |
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[fbb5097c] | 83 | void sync(void) |
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[bed55af] | 84 | { |
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[07e9194e] | 85 | |
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| 86 | /* |
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| 87 | * Walk the one used initially by RTEMS. |
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| 88 | */ |
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[d40da79b] | 89 | _fwalk(_global_impure_ptr, sync_wrapper); |
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[07e9194e] | 90 | |
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| 91 | /* |
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| 92 | * XXX Do we walk the one used globally by newlib? |
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| 93 | * XXX Do we need the RTEMS global one? |
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| 94 | */ |
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| 95 | |
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| 96 | /* |
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| 97 | * Now walk all the per-thread reentrancy structures. |
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| 98 | */ |
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[bed55af] | 99 | rtems_iterate_over_all_threads(sync_per_thread); |
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| 100 | } |
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