1 | /** |
---|
2 | * @file |
---|
3 | * |
---|
4 | * @ingroup IMFS |
---|
5 | */ |
---|
6 | |
---|
7 | /* |
---|
8 | * COPYRIGHT (c) 1989-1999. |
---|
9 | * On-Line Applications Research Corporation (OAR). |
---|
10 | * |
---|
11 | * The license and distribution terms for this file may be |
---|
12 | * found in the file LICENSE in this distribution or at |
---|
13 | * http://www.rtems.org/license/LICENSE. |
---|
14 | */ |
---|
15 | |
---|
16 | #if HAVE_CONFIG_H |
---|
17 | #include "config.h" |
---|
18 | #endif |
---|
19 | |
---|
20 | #include <string.h> |
---|
21 | |
---|
22 | #include "imfs.h" |
---|
23 | |
---|
24 | static ssize_t IMFS_linfile_read( |
---|
25 | rtems_libio_t *iop, |
---|
26 | void *buffer, |
---|
27 | size_t count |
---|
28 | ) |
---|
29 | { |
---|
30 | IMFS_file_t *file = IMFS_iop_to_file( iop ); |
---|
31 | off_t start = iop->offset; |
---|
32 | size_t size = file->File.size; |
---|
33 | const unsigned char *data = file->Linearfile.direct; |
---|
34 | |
---|
35 | if (count > size - start) |
---|
36 | count = size - start; |
---|
37 | |
---|
38 | IMFS_update_atime( &file->Node ); |
---|
39 | iop->offset = start + count; |
---|
40 | memcpy(buffer, &data[start], count); |
---|
41 | |
---|
42 | return (ssize_t) count; |
---|
43 | } |
---|
44 | |
---|
45 | static int IMFS_linfile_open( |
---|
46 | rtems_libio_t *iop, |
---|
47 | const char *pathname, |
---|
48 | int oflag, |
---|
49 | mode_t mode |
---|
50 | ) |
---|
51 | { |
---|
52 | IMFS_file_t *file; |
---|
53 | |
---|
54 | file = iop->pathinfo.node_access; |
---|
55 | |
---|
56 | /* |
---|
57 | * Perform 'copy on write' for linear files |
---|
58 | */ |
---|
59 | if (rtems_libio_iop_is_writeable(iop)) { |
---|
60 | uint32_t count = file->File.size; |
---|
61 | const unsigned char *buffer = file->Linearfile.direct; |
---|
62 | |
---|
63 | file->Node.control = &IMFS_mknod_control_memfile.node_control; |
---|
64 | file->File.size = 0; |
---|
65 | file->Memfile.indirect = 0; |
---|
66 | file->Memfile.doubly_indirect = 0; |
---|
67 | file->Memfile.triply_indirect = 0; |
---|
68 | |
---|
69 | IMFS_Set_handlers( &iop->pathinfo ); |
---|
70 | |
---|
71 | if ((count != 0) |
---|
72 | && (IMFS_memfile_write(&file->Memfile, 0, buffer, count) == -1)) |
---|
73 | return -1; |
---|
74 | } |
---|
75 | |
---|
76 | return 0; |
---|
77 | } |
---|
78 | |
---|
79 | static const rtems_filesystem_file_handlers_r IMFS_linfile_handlers = { |
---|
80 | .open_h = IMFS_linfile_open, |
---|
81 | .close_h = rtems_filesystem_default_close, |
---|
82 | .read_h = IMFS_linfile_read, |
---|
83 | .write_h = rtems_filesystem_default_write, |
---|
84 | .ioctl_h = rtems_filesystem_default_ioctl, |
---|
85 | .lseek_h = rtems_filesystem_default_lseek_file, |
---|
86 | .fstat_h = IMFS_stat_file, |
---|
87 | .ftruncate_h = rtems_filesystem_default_ftruncate, |
---|
88 | .fsync_h = rtems_filesystem_default_fsync_or_fdatasync_success, |
---|
89 | .fdatasync_h = rtems_filesystem_default_fsync_or_fdatasync_success, |
---|
90 | .fcntl_h = rtems_filesystem_default_fcntl, |
---|
91 | .kqfilter_h = rtems_filesystem_default_kqfilter, |
---|
92 | .mmap_h = rtems_filesystem_default_mmap, |
---|
93 | .poll_h = rtems_filesystem_default_poll, |
---|
94 | .readv_h = rtems_filesystem_default_readv, |
---|
95 | .writev_h = rtems_filesystem_default_writev |
---|
96 | }; |
---|
97 | |
---|
98 | const IMFS_node_control IMFS_node_control_linfile = { |
---|
99 | .handlers = &IMFS_linfile_handlers, |
---|
100 | .node_initialize = IMFS_node_initialize_default, |
---|
101 | .node_remove = IMFS_node_remove_default, |
---|
102 | .node_destroy = IMFS_node_destroy_default |
---|
103 | }; |
---|