blob: 3c32e0c836d18cb80e525f3cf60bf7707d690633 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
|
/*
* IMFS file change mode routine.
*
* COPYRIGHT (c) 1989-1999.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.OARcorp.com/rtems/license.html.
*
* $Id$
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <errno.h>
#include <rtems/libio_.h>
#include "imfs.h"
int IMFS_fchmod(
rtems_filesystem_location_info_t *loc,
mode_t mode
)
{
IMFS_jnode_t *jnode;
#if defined(RTEMS_POSIX_API)
uid_t st_uid;
#endif
jnode = loc->node_access;
/*
* Verify I am the owner of the node or the super user.
*/
#if defined(RTEMS_POSIX_API)
st_uid = geteuid();
if ( ( st_uid != jnode->st_uid ) && ( st_uid != 0 ) )
set_errno_and_return_minus_one( EPERM );
#endif
/*
* Change only the RWX permissions on the jnode to mode.
*/
if ( mode & (~ (S_IRWXU | S_IRWXG | S_IRWXO ) ) )
set_errno_and_return_minus_one( EPERM );
/*
* If we make a linear-file writeable, construct a block file
* from it first.
*/
if ( (jnode->type == IMFS_LINEAR_FILE) &&
(mode & (S_IWUSR | S_IWGRP | S_IWOTH)) )
{
unsigned32 count = jnode->info.linearfile.size;
const unsigned char *buffer = jnode->info.linearfile.direct;
jnode->type = IMFS_MEMORY_FILE;
jnode->info.file.size = 0;
jnode->info.file.indirect = 0;
jnode->info.file.doubly_indirect = 0;
jnode->info.file.triply_indirect = 0;
if (IMFS_memfile_write(jnode, 0, buffer, count) == -1)
return(-1);
}
jnode->st_mode &= ~(S_IRWXU | S_IRWXG | S_IRWXO);
jnode->st_mode |= mode;
IMFS_update_ctime( jnode );
return 0;
}
|