picld(1M)																 picld(1M)

NAME

       picld - PICL daemon

SYNOPSIS

       /usr/lib/picl/picld

       The  Platform Information and Control Library (PICL) provides a mechanism to publish platform-specific information for clients to access in
       a platform-independent way. picld maintains and controls access to the PICL information from clients and plug-in  modules.  The	daemon	is
       started in both single-user and multi-user boot mode.

       Upon  startup,  the PICL daemon loads and initializes the plug-in modules. These modules use the libpicltree(3PICLTREE) interface to create
       nodes and properties in the PICL tree to publish platform configuration information. After the plug-in modules are initialized, the  daemon
       opens the PICL daemon door to service client requests to access information in the PICL tree.

   PICL Tree
       The  PICL  tree	is  the repository of all the nodes and properties created by the plug-in modules to represent the platform configuration.
       Every node in the PICL tree is an instance of a well-defined PICL class. The name of the base PICL class is picl, which defines a basic set
       of  properties  that  all  nodes in the tree must possess. Two of those properties are name and _class, where name contains the name of the
       node, and the _class contains the PICL class name of the node. Certain nodes in the PICL tree have well-known names. For example, the  name
       of the root node of the PICL tree is / and the name of the root node of the sub-tree containing platform device nodes is platform.

   PICL plug-in Modules
       The  PICL  plug-in modules are shared objects that publish platform-specific data in the PICL tree. They are located in well-known directo-
       ries so that the daemon can locate and load them.

       Plug-in modules are located in one of the following plug-in directories depending on the plaform-specific nature of the data that they col-
       lect and publish:

       /usr/platform/`uname -i`/lib/picl/plugins
       /usr/platform/`uname -m`/lib/picl/plugins

       A plug-in module can specify its dependency on another plug-in module using the -l or -R linker option. The plug-ins are loaded by the dae-
       mon using dlopen(3C) according to the specified dependencies. Each plug-in module must define a .init section, which is executed  when  the
       plug-in	module is loaded, to register themselves with the daemon. See picld_plugin_register(3PICLTREE) for additional information on plug-
       in registration.

       The plug-in modules use the libpicltree(3PICLTREE) interface to publish nodes and properties in the PICL tree so that  clients  can  access
       them.

       When  the  PICL	daemon invokes the initialization routine of the plug-in module, the plug-in collects the platform information and creates
       nodes and/or properties to represent the configuration in the PICL tree. A plug-in can create additional threads to  monitor  the  platform
       configuration and update the PICL tree with any changes. This enables a PICL plug-in to operate as a daemon within the PICL framework.

       An  environmental  monitor is an example of a plug-in module that uses a thread to monitor the temperatures and fan speeds of the platform,
       then publishes the environmental information in the PICL tree so clients can access them.

       Clients use the libpicl(3PICL) interface to send requests to picld for accessing the PICL tree.

       picld does not return an exit status.

       /var/run/picld_door     PICL daemon door

       /usr/lib/picl/picld     PICL daemon

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWpiclu 		   |
       +-----------------------------+-----------------------------+

       svcs(1),  svcadm(1M),   dlopen(3C),   libpicl(3PICL),   libpicltree(3PICLTREE),	 picld_log(3PICLTREE),	 picld_plugin_register(3PICLTREE),
       attributes(5), smf(5)

       The picld service is managed by the service management facility, smf(5), under the service identifier:

       svc:/system/picl

       Administrative  actions	on  this  service, such as enabling, disabling, or requesting restart, can be performed using svcadm(1M). The ser-
       vice's status can be queried using the svcs(1) command.

								    10 Aug 2004 							 picld(1M)