attr_changed

void
res_attr_changed(const char *res_name, const char
         *changed_res_name,
         const char *changed_attr_name,
         void **new_val);

The parameter new_val contains the attribute's new value. The encoding of new_val is similar to the encoding of the ArgList Attribute.

You may select any name for the function.

The attr_changed field of VCSAgV40EntryPointStruct passed to VCSAgRegisterEPStruct() must be assigned a pointer to this function.

Note This entry point is called only if you register for change notification using the primitive VCSAgRegister, or the agent parameter RegList (see RegList).

For example:

#include "VCSAgApi.h"

void
  res_attr_changed(const char *res_name,
        const char *changed_res_name,
        const char *changed_attr_name,
        void **new_val) {
  // When the value of attribute Foo changes, take some action.
  if ((strcmp(res_name, changed_res_name) == 0) &&
    (strcmp(changed_attr_name, "Foo") == 0)) {
   // Extract the new value of Foo. Here, it is assumed
   // to be a string.
   const char *foo_val = (char *)new_val[0];
   // Implement the action.
    ...
  }
  // Resource Ora1 managed by this agent needs to
  // take some action when the Size attribute of
  // the resource Disk1 is changed.
  if ((strcmp(res_name, "Ora1") == 0) &&
    (strcmp(changed_attr_name, "Size") == 0) &&
    (strcmp(changed_res_name, "Disk1") == 0)) {

   // Extract the new value of Size. Here, it is
   // assumed to be an integer.
   int sizeval = atoi((char *)new_val[0]);
   // Implement the action.
    ...
  }
}

void VCSAgStartup() {
   VCSAgV40EntryPointStruct ep;
   ...
   ep.attr_changed =  res_attr_changed;
   ...
   VCSAgRegisterEPStruct(V40, &ep);
}


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Product: Cluster Server Guides
Manual: Cluster Server 4.1 Agent Developer's Guide
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