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      1 /*
      2  * ipc.h - Interprocess communication routines. Handlers read and write.
      3  *
      4  * Copyright (c) 2001-2006, NLnet Labs. All rights reserved.
      5  *
      6  * See LICENSE for the license.
      7  *
      8  */
      9 
     10 #ifndef NSD_IPC_H
     11 #define NSD_IPC_H
     12 
     13 #include "netio.h"
     14 struct buffer;
     15 struct nsd;
     16 struct nsd_child;
     17 struct xfrd_tcp;
     18 struct xfrd_state;
     19 struct nsdst;
     20 struct event;
     21 
     22 /*
     23  * Data for the server_main IPC handler
     24  * Used by parent side to listen to children, and write to children.
     25  */
     26 struct main_ipc_handler_data
     27 {
     28 	struct nsd	*nsd;
     29 	struct nsd_child *child;
     30 };
     31 
     32 /*
     33  * Data for ipc handler, nsd and a conn for reading ipc msgs.
     34  * Used by children to listen to parent.
     35  * Used by parent to listen to xfrd.
     36  */
     37 struct ipc_handler_conn_data
     38 {
     39 	struct nsd	*nsd;
     40 	struct xfrd_tcp	*conn;
     41 };
     42 
     43 /*
     44  * Routine used by server_main.
     45  * Handle a command received from the xfrdaemon processes.
     46  */
     47 void parent_handle_xfrd_command(netio_type *netio,
     48 	netio_handler_type *handler, netio_event_types_type event_types);
     49 
     50 /*
     51  * Routine used by server_main.
     52  * Handle a command received from the reload process.
     53  */
     54 void parent_handle_reload_command(netio_type *netio,
     55 	netio_handler_type *handler, netio_event_types_type event_types);
     56 
     57 /*
     58  * Routine used by server_main.
     59  * Handle a command received from the children processes.
     60  * Send commands and forwarded xfrd packets when writable.
     61  */
     62 void parent_handle_child_command(netio_type *netio,
     63 	netio_handler_type *handler, netio_event_types_type event_types);
     64 
     65 /*
     66  * Routine used by server_child.
     67  * Handle a command received from the parent process.
     68  */
     69 void child_handle_parent_command(int fd, short event, void* arg);
     70 
     71 /*
     72  * Routine used by xfrd
     73  * Handle interprocess communication with parent process, read and write.
     74  */
     75 void xfrd_handle_ipc(int fd, short event, void* arg);
     76 
     77 /* receive incoming notifies received by and from the serve processes */
     78 void xfrd_handle_notify(int fd, short event, void* arg);
     79 
     80 /* check if all children have exited in an orderly fashion and set mode */
     81 void parent_check_all_children_exited(struct nsd* nsd);
     82 
     83 /** add stats to total */
     84 void stats_add(struct nsdst* total, struct nsdst* s);
     85 /** subtract stats from total */
     86 void stats_subtract(struct nsdst* total, struct nsdst* s);
     87 
     88 /** set event to listen to given mode, no timeout, must be added already */
     89 void ipc_xfrd_set_listening(struct xfrd_state* xfrd, short mode);
     90 
     91 #endif /* NSD_IPC_H */
     92