FreeBSD/Linux Kernel Cross Reference
sys/sys/varsym.h
1 /*
2 * SYS/VARSYM.H
3 *
4 * Implements structures used for variant symlink support.
5 *
6 * $DragonFly: src/sys/sys/varsym.h,v 1.7 2008/02/23 00:59:23 swildner Exp $
7 */
8
9 #ifndef _SYS_VARSYM_H_
10 #define _SYS_VARSYM_H_
11
12 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
13
14 #ifndef _SYS_QUEUE_H_
15 #include <sys/queue.h> /* TAILQ_* macros */
16 #endif
17
18 #include <sys/lock.h>
19
20 struct varsym {
21 int vs_refs; /* a lot of sharing occurs */
22 int vs_namelen;
23 char *vs_name; /* variable name */
24 char *vs_data; /* variable contents */
25 };
26
27 typedef struct varsym *varsym_t;
28
29 struct varsyment {
30 TAILQ_ENTRY(varsyment) ve_entry;
31 varsym_t ve_sym;
32 };
33
34 struct varsymset {
35 TAILQ_HEAD(, varsyment) vx_queue;
36 int vx_setsize;
37 struct lock vx_lock;
38 };
39
40 #endif /* _KERNEL || _KERNEL_STRUCTURES */
41
42 #define VARSYM_PROC 1
43 #define VARSYM_USER 2
44 #define VARSYM_SYS 3
45 #define VARSYM_PRISON 4 /* used internally */
46
47 #define VARSYM_PROC_MASK (1 << VARSYM_PROC)
48 #define VARSYM_USER_MASK (1 << VARSYM_USER)
49 #define VARSYM_SYS_MASK (1 << VARSYM_SYS)
50 #define VARSYM_ALL_MASK (VARSYM_PROC_MASK|VARSYM_USER_MASK|VARSYM_SYS_MASK)
51
52 #define MAXVARSYM_NAME 64
53 #define MAXVARSYM_DATA 256
54 #define MAXVARSYM_SET 16384
55
56 #ifdef _KERNEL
57
58 varsym_t varsymfind(int mask, const char *name, int namelen);
59 int varsymmake(int level, const char *name, const char *data);
60 void varsymdrop(varsym_t var);
61 void varsymset_init(struct varsymset *varsymset, struct varsymset *copy);
62 void varsymset_clean(struct varsymset *varsymset);
63 int varsymreplace(char *cp, int linklen, int maxlen);
64
65 #endif /* _KERNEL */
66
67 #endif
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