Author: delphij
Date: Thu Oct 21 20:31:50 2010
New Revision: 214181
URL: http://svn.freebsd.org/changeset/base/214181

Log:
  Call chainevh callback when we are invoked with neither MOD_LOAD nor
  MOD_UNLOAD.  This makes it possible to add custom hooks for other module
  events.
  
  Return EOPNOTSUPP when there is no callback available.
  
  Pointed out by:       jhb
  Reviewed by:  jhb
  MFC after:    1 month

Modified:
  head/sys/kern/kern_syscalls.c

Modified: head/sys/kern/kern_syscalls.c
==============================================================================
--- head/sys/kern/kern_syscalls.c       Thu Oct 21 20:30:35 2010        
(r214180)
+++ head/sys/kern/kern_syscalls.c       Thu Oct 21 20:31:50 2010        
(r214181)
@@ -181,7 +181,9 @@ syscall_module_handler(struct module *mo
                error = syscall_deregister(data->offset, &data->old_sysent);
                return (error);
        default:
-               return EOPNOTSUPP;
+               if (data->chainevh)
+                       return (data->chainevh(mod, what, data->chainarg));
+               return (EOPNOTSUPP);
        }
 
        /* NOTREACHED */
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