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