winsup/cygwin/local_includes/sec_posixacl.h

   1 /* sec_posixacl.h: Internal definitions for POSIX ACLs.
   2
   3 This file is part of Cygwin.
   4
   5 This software is a copyrighted work licensed under the terms of the
   6 Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
   7 details. */
   8
   9 #include <cygwin/acl.h>
  10 #include <sys/acl.h>
  11 #include <acl/libacl.h>
  12
  13 /* Magic marker for acl_t. */
  14 #define ACL_MAGIC               (0xacdccdcadcaccacdULL)
  15
  16 /* Only used internally as a_type for deleted entries. */
  17 #define ACL_DELETED_TAG         (0xffff)
  18
  19 /* Only used internally from acl_to_text/acl_to_any_text. */
  20 #define TEXT_END_SEPARATOR      (0x1000)
  21 #define TEXT_IS_POSIX           (0x2000)
  22
  23 /* Internal ACL representation. */
  24 struct __acl_t
  25 {
  26   uint64_t magic;       /* Must be ACL_MAGIC.                           */
  27   uint16_t max_count;   /* Max. number of entries.                      */
  28   uint16_t count;       /* Number of used entries.                      */
  29   uint16_t deleted;     /* Number of used but deleted entries.          */
  30   uint16_t next;        /* Next entry to be returned by acl_get_entry.  */
  31   aclent_t *entry;      /* Pointer to variable array of ACL entries.    */
  32 };
  33
  34 inline acl_entry_t
  35 __to_entry (acl_t acl, uint16_t idx)
  36 {
  37   return ((uint64_t) idx << 48) | (uint64_t) ((uintptr_t) acl);
  38 }
  39 #define __to_permset(a,i)       ((acl_permset_t)__to_entry((a),(i)))
  40
  41 inline acl_t
  42 __from_entry (acl_entry_t entry_d, uint16_t &idx)
  43 {
  44   idx = entry_d >> 48;
  45   acl_t acl = (acl_t) (entry_d & ~((uint64_t) 0xffff << 48));
  46   if (acl->magic != ACL_MAGIC)
  47     return NULL;
  48   if (idx >= acl->count)
  49     return NULL;
  50   if (acl->entry[idx].a_type == ACL_DELETED_TAG)
  51     return NULL;
  52   return acl;
  53 }
  54 #define __from_permset(p,i)     __from_entry((acl_permset_t)(p),(i))
  55
  56 /* External (but opaque) ACL representation. */
  57 struct __acl_ext_t
  58 {
  59   uint16_t count;       /* Number of used entries.                      */
  60   aclent_t entry[0];    /* Variable array of ACL entries.               */
  61 };
  62
  63 /* Shared functions defined in sec_acl.cc. */
  64 mode_t __aclcalcmask (aclent_t *, int);
  65 int __aclsort (int, aclent_t *);
  66 int __aclcheck (aclent_t *, int, int *, bool);
  67 char *__acltotext (aclent_t *, int, const char *, char, int);
  68 void *__aclfromtext (const char *, int *, bool);