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