2 * Copyright (c) 2014 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 #include "namespace.h"
36 #include <sys/cdefs.h>
37 #include <sys/types.h>
38 #include <sys/syscall.h>
39 #include <sys/upmap.h>
42 #include <sys/fcntl.h>
48 #include "un-namespace.h"
49 #include "libc_private.h"
52 static pthread_mutex_t ukpmap_lock
;
53 static ukpheader_t
*kpmap_headers
;
54 static ukpheader_t
*upmap_headers
;
59 * Map the requested data item from the user-kernel global shared mmap
61 * *state is set to -1 on failure, else it is left alone.
62 * *datap is set to a pointer to the item on success, else it is left alone.
63 * If type == 0 this function finalizes state, setting it to 1 if it is 0.
66 __kpmap_map(void *datap
, int *state
, uint16_t type
)
71 _pthread_mutex_lock(&ukpmap_lock
);
78 fd
= _open("/dev/kpmap", O_RDONLY
);
83 kpmap_headers
= mmap(NULL
, KPMAP_MAPSIZE
,
84 PROT_READ
, MAP_SHARED
,
87 if ((void *)kpmap_headers
== MAP_FAILED
) {
95 * Special case to finalize state
101 _pthread_mutex_unlock(&ukpmap_lock
);
108 for (head
= kpmap_headers
; head
->type
; ++head
) {
109 if (head
->type
== type
) {
110 *(void **)datap
= (char *)kpmap_headers
+ head
->offset
;
112 _pthread_mutex_unlock(&ukpmap_lock
);
119 _pthread_mutex_unlock(&ukpmap_lock
);
123 * Map the requested data item from the user-kernel per-process shared mmap
125 * *state is set to -1 on failure, else it is left alone.
126 * *datap is set to a pointer to the item on success, else it is left alone.
127 * If type == 0 this function finalizes state, setting it to 1 if it is 0.
130 __upmap_map(void *datap
, int *state
, uint16_t type
)
135 _pthread_mutex_lock(&ukpmap_lock
);
142 fd
= _open("/dev/upmap", O_RDWR
);
147 upmap_headers
= mmap(NULL
, UPMAP_MAPSIZE
,
148 PROT_READ
| PROT_WRITE
, MAP_SHARED
,
151 if ((void *)upmap_headers
== MAP_FAILED
) {
159 * Special case to finalize state
165 _pthread_mutex_unlock(&ukpmap_lock
);
172 for (head
= upmap_headers
; head
->type
; ++head
) {
173 if (head
->type
== type
) {
174 *(void **)datap
= (char *)upmap_headers
+ head
->offset
;
176 _pthread_mutex_unlock(&ukpmap_lock
);
183 _pthread_mutex_unlock(&ukpmap_lock
);