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DCE, dce_intro, dced_intro, Server Execution Control Routines
*Conan The Librarian (sorry for the slow response - running on an old VAX)
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dced_server_disable_if
Disables a service provided by a server
dced_server_enable_if
Re-enables a service provided by a server
dced_server_stop Stops a DCE-configured server
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1 - dced_server_disable_if
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NAME
dced_server_disable_if - Disables a service (rpc interface)
provided by a specific server on a
specific host
SYNOPSIS
#include <dce/dced.h>
void dced_server_disable_if( dced_binding_handle_t dced_bh,
uuid_t *exec_uuid,
rpc_if_id_t *interface,
error_status_t *status );
PARAMETERS
Input
dced_bh
Specifies the dced binding handle for the srvrexec service
on a specific host.
exec_uuid
Specifies the UUID that dced uses to identify the running
server.
interface
Specifies the RPC interface identifier that represents the
service to be disabled. The interface identifier is generated
when idl compiles an interface definition file. The interface
identifier is an rpc_if_id_t structure that contains the
interface UUID (uuid) of type uuid_t, and numbers of type
unsigned16 representing the major (vers_major) and minor
(vers_minor) version numbers for the interface.
Output
status
Returns the status code from this routine. This status code
indicates whether the routine completed successfully or, if
not, why not. The possible status codes are:
error_status_ok
db_s_bad_index_type
db_s_iter_not_allowed
db_s_readonly
db_s_store_failed
dced_s_bad_binding
dced_s_not_found
sec_acl_invalid_permission
DESCRIPTION
The dced_server_disable_if() routine disables a service provided
by a server on a specific host. A service is represented by an
RPC interface identifier. Management applications use this
routine to remotely disable an interface so it is inaccessible by
clients, without completely stopping the entire server.
When a server starts and initializes itself, it must call the
dce_server_register() routine to enable all of its services.
The server can then disable its own individual services by using
dce_server_disable_service(). This routine unregisters the
service's interface from the RPC runtime and marks the interface
as disabled in the endpoint map. As an alternative, a management
application can use dced_server_disable_if() to disable individual
services. However, this routine only affects the endpoint map in
dced by marking the interface as disabled and does not affect the
server's runtime.
A management application can re-enable a service again by calling
the dced_server_enable_if() routine. (Servers re-enable their
own services using the dce_server_enable_if() routine.)
Prior to calling dced_server_disable_if(), the application must
have established a valid dced binding handle to the srvrexec
service by calling either dced_binding_create() or
dced_binding_from_rpc_binding().
RELATED INFORMATION
Routines: dce_server_register
dce_server_disable_if
dce_server_enable_if
dced_server_enable_if
dced_binding_create
dced_binding_from_rpc_binding
dcecp Objects: server
Books: OSF DCE Application Development Guide.
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2 - dced_server_enable_if
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NAME
dced_server_enable_if - Enables a service (rpc interface) of
a specific server on a specific host
SYNOPSIS
#include <dce/dced.h>
void dced_server_enable_if( dced_binding_handle_t dced_bh,
uuid_t *exec_uuid,
rpc_if_id_t *interface,
error_status_t *status );
PARAMETERS
Input
dced_bh
Specifies the dced binding handle for the srvrexec service
on a specific host.
exec_uuid
Specifies the UUID that dced uses to identify the running
server.
interface
Specifies the RPC interface identifier that represents the
service to be enabled. The interface identifier is generated
when idl compiles an interface definition file. The interface
identifier is a structure that contains the interface UUID
(interface->uuid), and the major (interface->vers_major) and
minor (interface->vers_minor) version numbers for the interface.
Output
status
Returns the status code from this routine. This status code
indicates whether the routine completed successfully or, if
not, why not. The possible status codes are:
error_status_ok
db_s_bad_index_type
db_s_iter_not_allowed
db_s_readonly
db_s_store_failed
dced_s_bad_binding
dced_s_not_found
sec_acl_invalid_permission
DESCRIPTION
The dced_server_enable_if() routine enables a service (or re-enables
a previously disabled service) that a specific server provides.
Management applications use this routine. A service is represented
by an RPC interface identifier.
When a server starts and initializes itself, it typically calls
the dce_server_register() routine to enable all of its services.
The services can then be disabled and re-enabled, as needed. A
server enables and disables its own services by using
dce_server_enable_service() and dce_server_disable_service() and
a management application enables and disables a remote server's
service using dced_server_enable_if() and dced_server_disable_if().
The dce_server* routines affect both the RPC runtime and the local
endpoint map by registering (or unregistering) with the runtime
and setting a flag for the interface in the the endpoint map as
enabled (or disabled). The dced_server_enable_if() and
dced_server_disable_if() routines affect only the remote endpoint
map by setting the flag.
Prior to calling dced_server_enable_if(), the application must
have established a valid dced binding handle to the srvrexec
service by calling either dced_binding_create() or
dced_binding_from_rpc_binding().
RELATED INFORMATION
Routines: dce_server_register
dce_server_enable_if
dce_server_disable_if
dced_server_disable_if
dced_binding_create
dced_binding_from_rpc_binding
dcecp Objects: server
Books: OSF DCE Application Development Guide.
NAME
dced_server_stop - Stops a DCE-configured server running on a
specific host
SYNOPSIS
#include <dce/dced.h>
void dced_server_stop( dced_binding_handle_t dced_bh,
uuid_t *exec_uuid,
srvrexec_stop_method_t method,
error_status_t *status );
PARAMETERS
Input
dced_bh
Specifies the dced binding handle for the srvrexec service
on a specific host.
exec_uuid
Specifies a UUID that dced uses to identify the running server.
If the value input is dced_g_uuid_all_servers, then dced
attempts to stop all the DCE servers running on that host.
method
Specifies the method dced uses to stop a server. A method is
represented by one of the following values:
srvrexec_stop_rpc
Uses the rpc_mgmt_stop_server_listening routine.
This is the cleanest way to stop a server
because it waits for outstanding remote procedure
calls to finish before making the server's
rpc_server_listen() routine return.
srvrexec_stop_soft
Uses a "soft" local host mechanism (such as the
TERM signal in UNIX)
srvrexec_stop_hard
Uses a "hard" local host mechanism (such as the
KILL signal in UNIX)
srvrexec_stop_error
Uses a mechanism that saves the program state
(such as the ABORT signal in UNIX)
Output
status
Returns the status code from this routine. This status code
indicates whether the routine completed successfully or, if
not, why not. The possible status codes are:
error_status_ok
dced_s_bad_binding
dced_s_no_support
dced_s_not_found
rpc_s_binding_incomplete
rpc_s_comm_failure
rpc_s_invalid_binding
rpc_s_mgmt_op_disallowed
rpc_s_unknown_if
rpc_s_wrong_kind_of_binding
sec_acl_invalid_permission
uuid_s_bad_version
DESCRIPTION
The dced_server_stop() routine stops DCE-configured servers on
specific hosts. When the server is completely stopped and no
longer a running process, dced deletes the associated execution
data it maintained.
Administrators use the dcecp operations server create and server
start to configure and start a server, and management applications
use the associated dced_server_create() and dced_server_start()
routines.
Prior to calling dced_server_stop(), the application must have
established a valid dced binding handle to the srvrexec service
by calling either dced_binding_create() or
dced_binding_from_rpc_binding().
CAUTIONS
Using the value dced_g_uuid_all_servers for the exec_uuid parameter
causes dced to shutdown all servers including itself.
EXAMPLES
The following example obtains dced binding handles to the server
configuration and execution services of dced on the host patrick.
The example then checks to see if the server is running by seeing
if dced has a UUID and entry for the executing server. However,
the server may be in the process of starting up or stopping, so the
example also checks to be sure the instance UUID of the running
server matches the UUID of the configuration for that server. If
there is a match, the server is running. Finally, the example
stops the server by calling dced_server_stop() with the
srvrexec_stop_rpc parameter.
dced_binding_handle_t conf_bh, exec_bh;
dced_string_t server_name;
void *data;
server_t *exec_ptr;
uuid_t srvrconf_id, srvrexec_id;
error_status_t status;
.
.
.
dced_binding_create( "srvrconf@hosts/patrick",
dced_c_binding_syntax_default,
&conf_bh,
&status );
dced_binding_create( "srvrexec@hosts/patrick",
dced_c_binding_syntax_default,
&exec_bh,
&status) ;
/* is server running? */
dced_inq_id( exec_bh, server_name, &srvrexec_id, &status );
/* also check to be sure server is not coming up or going down */
dced_object_read( exec_bh, &srvrexec_id, &data, &status );
exec_ptr = (server_t*)data;
dced_inq_id( conf_bh, server_name, &srvrconf_id, &status );
if (uuid_equal( &srvrconf_id,
&exec_ptr->exec_data.tagged_union.running_data.instance,
&status) ) {
dced_server_stop( exec_bh,
&srvrexec_id,
srvrexec_stop_rpc,
&status );
}
dced_objects_release( exec_bh, 1, data, &status );
dced_binding_free( conf_bh, &status );
dced_binding_free( exec_bh, &status );
RELATED INFORMATION
Routines: dced_server_create
dced_server_start
rpc_mgmt_stop_server_listening
dced_binding_create
dced_binding_from_rpc_binding
dcecp Objects: server
Books: OSF DCE Application Development Guide.
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