Content-type: text/html Man page of wsreg_unregister

wsreg_unregister

Section: Product Install Registry Library Functions (3WSREG)
Updated: 22 Sep 2000
Index Return to Main Contents
 

NAME

wsreg_unregister - remove a component from the product install registry  

SYNOPSIS

cc [flag ...]  file ...-lwsreg [library ...] 
#include <wsreg.h>

int wsreg_unregister(const Wsreg_component *comp);  

DESCRIPTION

The wsreg_unregister() function removes the component specified by comp from the product install registry. The component will only be removed if the comp argument has a matching uuid, instance, and version.

Usually, the component retrieved through a call to wsreg_get(3WSREG) before being passed to the wsreg_unregister() function.

If the component has required components, the respective dependent components will be updated to reflect the change.

A component that has dependent components cannot be unregistered until the dependent components are uninstalled and unregistered.  

RETURN VALUES

Upon successful completion, a non-zero return value is returned. If the component could not be unregistered, 0 is returned.  

EXAMPLES

Example 1: Unregister a component.

The following example demonstrates how to unregister a component.

#include <stdio.h>
#include <wsreg.h>
 
int main(int argc, char **argv)
{
    char *uuid = "d6cf2869-1dd1-11b2-9fcb-080020b69971";
         char *location = "/usr/local/example1_component";
         Wsreg_query *query = NULL;
         Wsreg_component *comp = NULL;

         /* Initialize the registry */
         wsreg_initialize(WSREG_INIT_NORMAL, NULL);

         /* Query for the component */
         query = wsreg_query_create();
         wsreg_query_set_id(query, uuid);
         wsreg_query_set_location(query, location);
         comp = wsreg_get(query);

         if (comp != NULL) {
             /* The query succeeded.  The component has been found. */
             Wsreg_component **dependent_comps;
             dependent_comps = wsreg_get_dependent_components(comp);
             if (dependent_comps != NULL) {
             /*
              * The component has dependent components.  The
              * component cannot be unregistered.
              */ 
             wsreg_free_component_array(dependent_comps);
             printf("The component cannot be uninstalled because "
                 "it has dependent components\n");
             } else {
                 /*  
                  * The component does not have dependent components.
                  * It can be unregistered.
                  */
                 if (wsreg_unregister(comp) != 0) {
                     printf("wsreg_unregister succeeded\n");
                 } else {
                     printf("unregister failed\n");
                 }
             }    
             /* Be sure to free the component */
             wsreg_free_component(comp);
         } else {
             /* The component is not currently registered. */
             printf("The component was not found in the registry\n");
         }
         wsreg_query_free(query);
}

 

USAGE

Components should be unregistered before uninstallation. If the component cannot be unregistered, uninstallation should not be performed.

A component cannot be unregistered if other registered components require it. A call to wsreg_get_dependent_components() can be used to determine if this situation exists. See wsreg_add_dependent_component(3WSREG).

A successful unregistration of a component will result in all components required by the unregistered component being updated in the product install registry to remove the dependency. Also, child components will be updated so the unregistered component is no longer registered as their parent.

When unregistering a product, the product should first be unregistered, followed by the unregistration of its first feature and then the unregistration and uninstallation of the components that comprise that feature. Be sure to use this top-down approach to avoid removing a component that belongs to a product or feature that is required by a separate product.  

ATTRIBUTES

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

ATTRIBUTE TYPEATTRIBUTE VALUE
MT-LevelUnsafe

 

SEE ALSO

wsreg_add_dependent_component(3WSREG), wsreg_get(3WSREG), wsreg_initialize(3WSREG), wsreg_register(3WSREG), attributes(5)


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUES
EXAMPLES
USAGE
ATTRIBUTES
SEE ALSO

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Time: 02:37:49 GMT, October 02, 2010