bsd/sys/fsevents.h

   1 /*
   2  * Copyright (c) 2000-2014 Apple Inc. All rights reserved.
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  10  * may not be used to create, or enable the creation or redistribution of,
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  15  * Please obtain a copy of the License at
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  27  */
  28 #ifndef FSEVENT_H
  29 #define FSEVENT_H 1
  30
  31 // Event types that you can ask to listen for
  32 #define FSE_INVALID             -1
  33 #define FSE_CREATE_FILE          0
  34 #define FSE_DELETE               1
  35 #define FSE_STAT_CHANGED         2
  36 #define FSE_RENAME               3
  37 #define FSE_CONTENT_MODIFIED     4
  38 #define FSE_EXCHANGE             5
  39 #define FSE_FINDER_INFO_CHANGED  6
  40 #define FSE_CREATE_DIR           7
  41 #define FSE_CHOWN                8
  42 #define FSE_XATTR_MODIFIED       9
  43 #define FSE_XATTR_REMOVED       10
  44 #define FSE_DOCID_CREATED       11
  45 #define FSE_DOCID_CHANGED       12
  46
  47 #define FSE_MAX_EVENTS          13
  48 #define FSE_ALL_EVENTS         998
  49
  50 #define FSE_EVENTS_DROPPED     999
  51
  52 //
  53 // These defines only apply if you've asked for extended
  54 // type info.  In that case the type field's low 12-bits
  55 // contain the basic types defined above and the top 4
  56 // bits contain flags that indicate if an event had other
  57 // events combined with it or if it represents a directory
  58 // that has dropped events below it.
  59 //
  60 #define FSE_TYPE_MASK          0x0fff
  61 #define FSE_FLAG_MASK          0xf000
  62 #define FSE_FLAG_SHIFT         12
  63 #define FSE_GET_FLAGS(type)    (((type) >> 12) & 0x000f)
  64
  65 #define FSE_COMBINED_EVENTS          0x0001
  66 #define FSE_CONTAINS_DROPPED_EVENTS  0x0002
  67
  68
  69 // Actions for each event type
  70 #define FSE_IGNORE    0
  71 #define FSE_REPORT    1
  72 #define FSE_ASK       2    // Not implemented yet
  73
  74 // The types of each of the arguments for an event
  75 // Each type is followed by the size and then the
  76 // data.  FSE_ARG_VNODE is just a path string
  77 #define FSE_ARG_VNODE    0x0001   // next arg is a vnode pointer
  78 #define FSE_ARG_STRING   0x0002   // next arg is length followed by string ptr
  79 #define FSE_ARG_PATH     0x0003   // next arg is a full path
  80 #define FSE_ARG_INT32    0x0004   // next arg is a 32-bit int
  81 #define FSE_ARG_INT64    0x0005   // next arg is a 64-bit int
  82 #define FSE_ARG_RAW      0x0006   // next arg is a length followed by a void ptr
  83 #define FSE_ARG_INO      0x0007   // next arg is the inode number (ino_t)
  84 #define FSE_ARG_UID      0x0008   // next arg is the file's uid (uid_t)
  85 #define FSE_ARG_DEV      0x0009   // next arg is the file's dev_t
  86 #define FSE_ARG_MODE     0x000a   // next arg is the file's mode (as an int32, file type only)
  87 #define FSE_ARG_GID      0x000b   // next arg is the file's gid (gid_t)
  88 #define FSE_ARG_FINFO    0x000c   // next arg is a packed finfo (dev, ino, mode, uid, gid)
  89 #define FSE_ARG_DONE     0xb33f   // no more arguments
  90
  91 #define FSE_MAX_ARGS     12
  92
  93 //
  94 // These are special bits that be set in the 32-bit mode
  95 // field that /dev/fsevents provides.
  96 //
  97 #define FSE_MODE_HLINK         (1 << 31)    // notification is for a hard-link
  98 #define FSE_MODE_LAST_HLINK    (1 << 30)    // link count == 0 on a hard-link delete
  99 #define FSE_REMOTE_DIR_EVENT   (1 << 29)    // this is a remotely generated directory-level granularity event
 100 #define FSE_TRUNCATED_PATH     (1 << 28)    // the path for this item had to be truncated
 101
 102 // ioctl's on /dev/fsevents
 103 typedef struct fsevent_clone_args {
 104     int8_t  *event_list;
 105     int32_t  num_events;
 106     int32_t  event_queue_depth;
 107     int32_t *fd;
 108 } fsevent_clone_args;
 109
 110 #define FSEVENTS_CLONE          _IOW('s', 1, fsevent_clone_args)
 111
 112
 113 // ioctl's on the cloned fd
 114 #pragma pack(push, 4)
 115 typedef struct fsevent_dev_filter_args {
 116     uint32_t  num_devices;
 117     dev_t    *devices;
 118 } fsevent_dev_filter_args;
 119 #pragma pack(pop)
 120
 121 #define FSEVENTS_DEVICE_FILTER          _IOW('s', 100, fsevent_dev_filter_args)
 122 #define FSEVENTS_WANT_COMPACT_EVENTS    _IO('s', 101)
 123 #define FSEVENTS_WANT_EXTENDED_INFO     _IO('s', 102)
 124 #define FSEVENTS_GET_CURRENT_ID         _IOR('s', 103, uint64_t)
 125
 126
 127 #ifdef KERNEL
 128
 129 void fsevents_init(void);
 130 int  need_fsevent(int type, vnode_t vp);
 131 int  add_fsevent(int type, vfs_context_t, ...);
 132 void fsevent_unmount(struct mount *mp);
 133 struct vnode_attr;
 134 void create_fsevent_from_kevent(vnode_t vp, uint32_t kevents, struct vnode_attr *vap);
 135
 136 // misc utility functions for fsevent info and pathbuffers...
 137 typedef struct fse_info {
 138     ino64_t    ino;
 139     dev_t      dev;
 140     int32_t    mode;   // note: this is not a mode_t (it's 32-bits, not 16)
 141     uid_t      uid;
 142     gid_t      gid;
 143     uint64_t   nlink;  // only filled in if the vnode is marked as a hardlink
 144 } fse_info;
 145
 146 int   get_fse_info(struct vnode *vp, fse_info *fse, vfs_context_t ctx);
 147 int   vnode_get_fse_info_from_vap(vnode_t vp, fse_info *fse, struct vnode_attr *vap);
 148
 149 char *get_pathbuff(void);
 150 void  release_pathbuff(char *path);
 151
 152 #endif /* KERNEL */
 153
 154 #endif /* FSEVENT_H */