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
|
/* Mach task store backend
Copyright (C) 1995,96,97,2001, 2002 Free Software Foundation, Inc.
Written by Miles Bader <miles@gnu.org>
This file is part of the GNU Hurd.
The GNU Hurd is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2, or (at
your option) any later version.
The GNU Hurd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <hurd.h>
#include <mach/machine/vm_param.h>
#include "store.h"
static process_t
proc_server ()
{
static process_t proc = MACH_PORT_NULL;
if (proc == MACH_PORT_NULL)
proc = getproc ();
return proc;
}
static error_t
topen (const char *name, task_t *task)
{
char *name_end;
pid_t pid = strtoul (name, &name_end, 0);
if (*name == '\0' || *name_end != '\0')
return EINVAL;
return proc_pid2task (proc_server (), pid, task);
}
static void
tclose (struct store *store)
{
mach_port_deallocate (mach_task_self (), store->port);
store->port = MACH_PORT_NULL;
}
static error_t
task_read (struct store *store,
store_offset_t addr, size_t index, size_t amount, void **buf, size_t *len)
{
size_t bsize = store->block_size;
return vm_read (store->port, addr * bsize, amount, (vm_address_t *)buf, len);
}
static error_t
task_write (struct store *store,
store_offset_t addr, size_t index,
const void *buf, size_t len, size_t *amount)
{
size_t bsize = store->block_size;
error_t err = vm_write (store->port, addr * bsize, (vm_address_t)buf, len);
if (! err)
*amount = len;
return err;
}
static error_t
task_set_size (struct store *store, size_t newsize)
{
return EOPNOTSUPP;
}
static error_t
task_decode (struct store_enc *enc, const struct store_class *const *classes,
struct store **store)
{
return store_std_leaf_decode (enc, _store_task_create, store);
}
static error_t
task_open (const char *name, int flags,
const struct store_class *const *classes,
struct store **store)
{
return store_task_open (name, flags, store);
}
static error_t
task_set_flags (struct store *store, int flags)
{
if ((flags & ~(STORE_INACTIVE | STORE_ENFORCED)) != 0)
/* Trying to set flags we don't support. */
return EINVAL;
if ((flags & STORE_ENFORCED)
&& (store->num_runs > 0
|| store->runs[0].start != 0
|| store->runs[0].length != (VM_MAX_ADDRESS >> store->log2_block_size)))
/* Kernel only enforces the whole thing... */
return EINVAL;
if (flags & STORE_INACTIVE)
tclose (store);
store->flags |= flags; /* When inactive, anything goes. */
return 0;
}
static error_t
task_clear_flags (struct store *store, int flags)
{
error_t err = 0;
if ((flags & ~(STORE_INACTIVE | STORE_ENFORCED)) != 0)
err = EINVAL;
if (!err && (flags & STORE_INACTIVE))
err = store->name ? topen (store->name, &store->port) : ESRCH;
if (! err)
store->flags &= ~flags;
return err;
}
const struct store_class
store_task_class =
{
STORAGE_TASK, "task", task_read, task_write, task_set_size,
store_std_leaf_allocate_encoding, store_std_leaf_encode, task_decode,
task_set_flags, task_clear_flags, 0, 0, 0, task_open
};
STORE_STD_CLASS (task);
/* Return a new store in STORE referring to the mach task TASK. Consumes
the send right TASK. */
error_t
store_task_create (task_t task, int flags, struct store **store)
{
struct store_run run;
run.start = 0;
run.length = VM_MAX_ADDRESS / vm_page_size;
flags |= STORE_ENFORCED; /* 'cause it's the whole task. */
return _store_task_create (task, flags, vm_page_size, &run, 1, store);
}
/* Like store_task_create, but doesn't query the task for information. */
error_t
_store_task_create (task_t task, int flags, size_t block_size,
const struct store_run *runs, size_t num_runs,
struct store **store)
{
error_t err = 0;
if (block_size >= vm_page_size)
err = _store_create (&store_task_class,
task, flags, block_size, runs, num_runs, 0, store);
else
err = EINVAL; /* block size less than page size. */
if (! err)
{
pid_t pid;
err = proc_task2pid (proc_server (), task, &pid);
if (! err)
{
char buf[20];
snprintf (buf, sizeof buf, "%u", pid);
err = store_set_name (*store, buf);
}
if (err)
store_free (*store);
}
return err;
}
/* Open the task NAME, and return the corresponding store in STORE. */
error_t
store_task_open (const char *name, int flags, struct store **store)
{
task_t task;
error_t err = topen (name, &task);
if (! err)
{
err = store_task_create (task, flags, store);
if (err)
mach_port_deallocate (mach_task_self (), task);
}
return err;
}
|
