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
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
|
/* fhandler_virtual.cc: base fhandler class for virtual filesystems
Copyright 2002, 2003, 2004 Red Hat, Inc.
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#include "winsup.h"
#include <unistd.h>
#include <stdlib.h>
#include <sys/cygwin.h>
#include <sys/acl.h>
#include "cygerrno.h"
#include "security.h"
#include "path.h"
#include "fhandler.h"
#include "dtable.h"
#include "shared_info.h"
#include "cygheap.h"
#include <assert.h>
#include <dirent.h>
fhandler_virtual::fhandler_virtual ():
fhandler_base (), filebuf (NULL), bufalloc ((size_t) -1),
fileid (-1)
{
}
fhandler_virtual::~fhandler_virtual ()
{
if (filebuf)
free (filebuf);
filebuf = NULL;
}
void
fhandler_virtual::fixup_after_exec ()
{
if (filebuf)
filebuf = NULL;
}
DIR *
fhandler_virtual::opendir ()
{
DIR *dir;
DIR *res = NULL;
size_t len;
if (exists () <= 0)
set_errno (ENOTDIR);
else if ((len = strlen (get_name ())) > CYG_MAX_PATH - 3)
set_errno (ENAMETOOLONG);
else if ((dir = (DIR *) malloc (sizeof (DIR))) == NULL)
set_errno (ENOMEM);
else if ((dir->__d_dirname = (char *) malloc (len + 3)) == NULL)
{
free (dir);
set_errno (ENOMEM);
}
else if ((dir->__d_dirent =
(struct dirent *) malloc (sizeof (struct dirent))) == NULL)
{
free (dir);
set_errno (ENOMEM);
}
else
{
strcpy (dir->__d_dirname, get_name ());
dir->__d_dirent->d_version = __DIRENT_VERSION;
cygheap_fdnew fd;
if (fd >= 0)
{
fd = this;
fd->nohandle (true);
dir->__d_dirent->d_fd = fd;
dir->__fh = this;
dir->__d_cookie = __DIRENT_COOKIE;
dir->__handle = INVALID_HANDLE_VALUE;
dir->__d_position = 0;
dir->__d_dirhash = get_namehash ();
res = dir;
}
}
syscall_printf ("%p = opendir (%s)", res, get_name ());
return res;
}
_off64_t fhandler_virtual::telldir (DIR * dir)
{
return dir->__d_position;
}
void
fhandler_virtual::seekdir (DIR * dir, _off64_t loc)
{
dir->__d_position = loc;
return;
}
void
fhandler_virtual::rewinddir (DIR * dir)
{
dir->__d_position = 0;
return;
}
int
fhandler_virtual::closedir (DIR * dir)
{
return 0;
}
_off64_t
fhandler_virtual::lseek (_off64_t offset, int whence)
{
/*
* On Linux, when you lseek within a /proc file,
* the contents of the file are updated.
*/
if (!fill_filebuf ())
return (_off64_t) -1;
switch (whence)
{
case SEEK_SET:
position = offset;
break;
case SEEK_CUR:
position += offset;
break;
case SEEK_END:
position = filesize + offset;
break;
default:
set_errno (EINVAL);
return (_off64_t) -1;
}
return position;
}
int
fhandler_virtual::dup (fhandler_base * child)
{
int ret = fhandler_base::dup (child);
if (!ret)
{
fhandler_virtual *fhproc_child = (fhandler_virtual *) child;
fhproc_child->filebuf = (char *) malloc (filesize);
fhproc_child->bufalloc = fhproc_child->filesize = filesize;
fhproc_child->position = position;
memcpy (fhproc_child->filebuf, filebuf, filesize);
fhproc_child->set_flags (get_flags ());
}
return ret;
}
int
fhandler_virtual::close ()
{
if (filebuf)
free (filebuf);
filebuf = NULL;
bufalloc = (size_t) -1;
user_shared->delqueue.process_queue ();
return 0;
}
void
fhandler_virtual::read (void *ptr, size_t& len)
{
if (len == 0)
return;
if (openflags & O_DIROPEN)
{
set_errno (EISDIR);
len = (size_t) -1;
return;
}
if (!filebuf)
{
len = (size_t) 0;
return;
}
if ((ssize_t) len > filesize - position)
len = (size_t) (filesize - position);
if ((ssize_t) len < 0)
len = 0;
else
memcpy (ptr, filebuf + position, len);
position += len;
}
int
fhandler_virtual::write (const void *ptr, size_t len)
{
set_errno (EACCES);
return -1;
}
/* low-level open for all proc files */
int
fhandler_virtual::open (int flags, mode_t mode)
{
rbinary (true);
wbinary (true);
set_flags ((flags & ~O_TEXT) | O_BINARY);
return 1;
}
int
fhandler_virtual::exists ()
{
return 0;
}
bool
fhandler_virtual::fill_filebuf ()
{
return true;
}
int
fhandler_virtual::fchmod (mode_t mode)
{
/* Same as on Linux. */
set_errno (EPERM);
return -1;
}
int
fhandler_virtual::fchown (__uid32_t uid, __gid32_t gid)
{
/* Same as on Linux. */
set_errno (EPERM);
return -1;
}
int
fhandler_virtual::facl (int cmd, int nentries, __aclent32_t *aclbufp)
{
/* Same as on Linux. */
set_errno (EPERM);
return -1;
}
|
