1 files changed, 85 insertions, 0 deletions
diff --git a/include/net-snmp/library/callback.h b/include/net-snmp/library/callback.h
new file mode 100644
index 0000000..56cdbae
--- /dev/null
+++ b/include/net-snmp/library/callback.h
@@ -0,0 +1,85 @@
+/*
+ * callback.c: A generic callback mechanism 
+ */
+
+#ifndef CALLBACK_H
+#define CALLBACK_H
+
+#ifdef __cplusplus
+extern          "C" {
+#endif
+
+#define MAX_CALLBACK_IDS    2
+#define MAX_CALLBACK_SUBIDS 16
+
+    /*
+     * Callback Major Types 
+     */
+#define SNMP_CALLBACK_LIBRARY     0
+#define SNMP_CALLBACK_APPLICATION 1
+
+    /*
+     * SNMP_CALLBACK_LIBRARY minor types 
+     */
+#define SNMP_CALLBACK_POST_READ_CONFIG	        0
+#define SNMP_CALLBACK_STORE_DATA	        1
+#define SNMP_CALLBACK_SHUTDOWN		        2
+#define SNMP_CALLBACK_POST_PREMIB_READ_CONFIG	3
+#define SNMP_CALLBACK_LOGGING			4
+#define SNMP_CALLBACK_SESSION_INIT		5
+#define SNMP_CALLBACK_PRE_READ_CONFIG	        7
+#define SNMP_CALLBACK_PRE_PREMIB_READ_CONFIG	8
+
+
+    /*
+     * Callback priority (lower priority numbers called first(
+     */
+#define NETSNMP_CALLBACK_HIGHEST_PRIORITY      -1024 
+#define NETSNMP_CALLBACK_DEFAULT_PRIORITY       0
+#define NETSNMP_CALLBACK_LOWEST_PRIORITY        1024
+
+    typedef int     (SNMPCallback) (int majorID, int minorID,
+                                    void *serverarg, void *clientarg);
+
+    struct snmp_gen_callback {
+        SNMPCallback   *sc_callback;
+        void           *sc_client_arg;
+        int             priority;
+        struct snmp_gen_callback *next;
+    };
+
+    /*
+     * function prototypes 
+     */
+    NETSNMP_IMPORT
+    void            init_callbacks(void);
+
+    NETSNMP_IMPORT
+    int             netsnmp_register_callback(int major, int minor,
+                                              SNMPCallback * new_callback,
+                                              void *arg, int priority);
+    NETSNMP_IMPORT
+    int             snmp_register_callback(int major, int minor,
+                                           SNMPCallback * new_callback,
+                                           void *arg);
+    NETSNMP_IMPORT
+    int             snmp_call_callbacks(int major, int minor,
+                                        void *caller_arg);
+    NETSNMP_IMPORT
+    int             snmp_callback_available(int major, int minor);      /* is >1 available */
+    NETSNMP_IMPORT
+    int             snmp_count_callbacks(int major, int minor); /* ret the number registered */
+    NETSNMP_IMPORT
+    int             snmp_unregister_callback(int major, int minor,
+                                             SNMPCallback * new_callback,
+                                             void *arg, int matchargs);
+    NETSNMP_IMPORT
+    void            clear_callback (void);
+    int             netsnmp_callback_clear_client_arg(void *, int i, int j);
+
+    struct snmp_gen_callback *snmp_callback_list(int major, int minor);
+
+#ifdef __cplusplus
+}
+#endif
+#endif                          /* CALLBACK_H */