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6 .TH LIBPICLTREE 3PICLTREE "Mar 1, 2004"
7 .SH NAME
8 libpicltree \- PTree and Plug-in Registration interface library
9 .SH SYNOPSIS
10 .LP
11 .nf
12 \fBcc\fR [\fIflag \&.\|.\|.\fR] \fIfile \fR\&.\|.\|. \fB-lpicltree\fR [\fIlibrary \&.\|.\|.\fR]
13 #include <picltree.h>
14 .fi
15
16 .SH DESCRIPTION
17 .sp
18 .LP
19 The PTree interface is the set of functions and data structures to access and
20 manipulate the PICL tree. The daemon and the plug-in modules use the PTree
21 interface.
22 .sp
23 .LP
24 The Plug-in Registration interface is used by the plug-in modules to register
25 themselves with the daemon.
26 .sp
27 .LP
28 The plug-in modules create the nodes and properties of the tree. At the time of
29 creating a property, the plug-ins specify the property information in the
30 \fBptree_propinfo_t\fR structure defined as:
31 .sp
32 .in +2
33 .nf
34 typedef struct {
35 int version; /* version */
36 picl_propinfo_t piclinfo; /* info to clients */
37 int (*read)(ptree_rarg_t *arg, void *buf);
38 /* read access function for */
39 /* volatile prop */
40 int (*write)(ptree_warg_t *arg, const void *buf);
41 /* write access function for */
42 /* volatile prop */
43 } ptree_propinfo_t;
44 .fi
45 .in -2
46
47 .sp
48 .LP
49 See \fBlibpicl\fR(3PICL) for more information on PICL tree nodes and
50 properties.
51 .sp
52 .LP
53 The maximum size of a property value cannot exceed \fBPICL_PROPSIZE_MAX\fR. It
54 is currently set to 512KB.
55 .SS "Volatile Properties"
56 .sp
57 .LP
58 In addition to \fBPICL_READ\fR and \fBPICL_WRITE\fR property access modes, the
59 plug-in modules specify whether a property is volatile or not by setting the
60 bit \fBPICL_VOLATILE\fR.
61 .sp
62 .in +2
63 .nf
64 #define PICL_VOLATILE 0x4
65 .fi
66 .in -2
67
68 .sp
69 .LP
70 For a volatile property, the plug-in module provides the access functions to
71 read and/or write the property in the \fBptree_propinfo_t\fR argument passed
72 when creating the property.
73 .sp
74 .LP
75 The daemon invokes the access functions of volatile properties when clients
76 access their values. Two arguments are passed to the read access functions. The
77 first argument is a pointer to \fBptree_rarg_t\fR, which contains the handle of
78 the node, the handle of the accessed property and the credentials of the
79 caller. The second argument is a pointer to the buffer where the value is to
80 be copied.
81 .sp
82 .in +2
83 .nf
84 typedef struct {
85 picl_nodehdl_t nodeh;
86 picl_prophdl_t proph;
87 door_cred_t cred;
88 } ptree_rarg_t;
89 .fi
90 .in -2
91
92 .sp
93 .LP
94 The prototype of the read access function for volatile property is:
95 .sp
96 .in +2
97 .nf
98 int read(ptree_rarg_t *rarg, void *buf);
99 .fi
100 .in -2
101
102 .sp
103 .LP
104 The read function returns \fBPICL_SUCCESS\fR to indicate successful completion.
105 .sp
106 .LP
107 Similarly, when a write access is performed on a volatile property, the daemon
108 invokes the write access function provided by the plug-in for that property and
109 passes it two arguments. The first argument is a pointer to \fBptree_warg_t\fR,
110 which contains the handle to the node, the handle of the accessed property and
111 the credentials of the caller. The second argument is a pointer to the buffer
112 containing the value to be written.
113 .sp
114 .in +2
115 .nf
116 typedef struct {
117 picl_nodehdl_t nodeh;
118 picl_prophdl_t proph;
119 door_cred_t cred;
120 } ptree_warg_t;
121 .fi
122 .in -2
123
124 .sp
125 .LP
126 The prototype of the write access function for volatile property is:
127 .sp
128 .in +2
129 .nf
130 int write(ptree_warg_t *warg, const void *buf);
131 .fi
132 .in -2
133
134 .sp
135 .LP
136 The write function returns \fBPICL_SUCCESS\fR to indicate successful
137 completion.
138 .sp
139 .LP
140 For all volatile properties, the 'size' of the property must be specified to be
141 the maximum possible size of the value. The maximum size of the value cannot
142 exceed \fBPICL_PROPSIZE_MAX\fR. This allows a client to allocate a sufficiently
143 large buffer before retrieving a volatile property's value
144 .SS "Plug-in Modules"
145 .sp
146 .LP
147 Plug-in modules are shared objects that are located in well-known directories
148 for the daemon to locate and load them. Plug-in module's are located in the one
149 of the following plug-in directories depending on the plaform-specific nature
150 of the data they collect and publish.
151 .sp
152 .in +2
153 .nf
154 /usr/platform/picl/plugins/`uname -i`/
155 /usr/platform/picl/plugins/`uname -m`/
156 /usr/lib/picl/plugins/
157 .fi
158 .in -2
159
160 .sp
161 .LP
162 A plug-in module may specify its dependency on another plug-in module using the
163 \fB-l\fR linker option. The plug-ins are loaded by the PICL daemon using
164 \fBdlopen\fR(3C) according to the specified dependencies. Each plug-in module
165 must define a \fB\&.init\fR section, which is executed when the plug-in module
166 is loaded, to register themselves with the daemon. See
167 \fBpicld_plugin_register\fR(3PICLTREE) for more information on plug-in
168 registration.
169 .sp
170 .LP
171 The plug-in modules may use the \fBpicld_log\fR(3PICLTREE) function to log
172 their messages to the system log file.
173 .SH ATTRIBUTES
174 .sp
175 .LP
176 See \fBattributes\fR(5) for descriptions of the following attributes:
177 .sp
178
179 .sp
180 .TS
181 box;
182 c | c
183 l | l .
184 ATTRIBUTE TYPE ATTRIBUTE VALUE
185 _
186 MT-Level MT-Safe
187 .TE
188
189 .SH SEE ALSO
190 .sp
191 .LP
192 \fBlibpicl\fR(3PICL), \fBlibpicltree\fR(3LIB), \fBpicld_log\fR(3PICLTREE),
193 \fBpicld_plugin_register\fR(3PICLTREE), \fBattributes\fR(5)