--- /dev/null
+#ifndef INCLUDED_ircd_events_h
+#define INCLUDED_ircd_events_h
+/*
+ * IRC - Internet Relay Chat, include/ircd_events.h
+ * Copyright (C) 2001 Kevin L. Mitchell <klmitch@mit.edu>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+/** @file
+ * @brief Interface and public definitions for event loop.
+ * @version $Id$
+ */
+
+#ifndef INCLUDED_config_h
+#include "config.h"
+#endif
+#ifndef INCLUDED_sys_types_h
+#include <sys/types.h> /* time_t */
+#define INCLUDED_sys_types_h
+#endif
+
+struct Event;
+
+/** Generic callback for event activity. */
+typedef void (*EventCallBack)(struct Event*);
+
+/** State of a Socket structure. */
+enum SocketState {
+ SS_CONNECTING, /**< Connection in progress on socket */
+ SS_LISTENING, /**< Socket is a listening socket */
+ SS_CONNECTED, /**< Socket is a connected socket */
+ SS_DATAGRAM, /**< Socket is a datagram socket */
+ SS_CONNECTDG, /**< Socket is a connected datagram socket */
+ SS_NOTSOCK /**< Socket isn't a socket at all */
+};
+
+/** Type of a Timer (how its expiration is measured). */
+enum TimerType {
+ TT_ABSOLUTE, /**< timer that runs at a specific time */
+ TT_RELATIVE, /**< timer that runs so many seconds in the future */
+ TT_PERIODIC /**< timer that runs periodically */
+};
+
+/** Type of event that generated a callback. */
+enum EventType {
+ ET_READ, /**< Readable event detected */
+ ET_WRITE, /**< Writable event detected */
+ ET_ACCEPT, /**< Connection can be accepted */
+ ET_CONNECT, /**< Connection completed */
+ ET_EOF, /**< End-of-file on connection */
+ ET_ERROR, /**< Error condition detected */
+ ET_SIGNAL, /**< A signal was received */
+ ET_EXPIRE, /**< A timer expired */
+ ET_DESTROY /**< The generator is being destroyed */
+};
+
+/** Common header for event generators. */
+struct GenHeader {
+ struct GenHeader* gh_next; /**< linked list of generators */
+ struct GenHeader** gh_prev_p; /**< previous pointer to this generator */
+#ifdef IRCD_THREADED
+ struct GenHeader* gh_qnext; /**< linked list of generators in queue */
+ struct GenHeader** gh_qprev_p; /**< previous pointer to this generator */
+ struct Event* gh_head; /**< head of event queue */
+ struct Event* gh_tail; /**< tail of event queue */
+#endif
+ unsigned int gh_flags; /**< generator flags */
+ unsigned int gh_ref; /**< reference count */
+ EventCallBack gh_call; /**< generator callback function */
+ void* gh_data; /**< extra data */
+ union {
+ void* ed_ptr; /**< engine data as pointer */
+ int ed_int; /**< engine data as integer */
+ } gh_engdata;/**< engine data */
+};
+
+#define GEN_DESTROY 0x0001 /**< generator is to be destroyed */
+#define GEN_MARKED 0x0002 /**< generator is marked for destruction */
+#define GEN_ACTIVE 0x0004 /**< generator is active */
+#define GEN_READD 0x0008 /**< generator (timer) must be re-added */
+#define GEN_ERROR 0x0010 /**< an error occurred on the generator */
+
+/** Socket event generator.
+ * Note: The socket state overrides the socket event mask; that is, if
+ * it's an SS_CONNECTING socket, the engine selects its own definition
+ * of what that looks like and ignores s_events. s_events is meaningful
+ * only for SS_CONNECTED, SS_DATAGRAM, and SS_CONNECTDG, but may be set
+ * prior to the state transition, if desired.
+ */
+struct Socket {
+ struct GenHeader s_header; /**< generator information */
+ enum SocketState s_state; /**< state socket's in */
+ unsigned int s_events; /**< events socket is interested in */
+ int s_fd; /**< file descriptor for socket */
+};
+
+#define SOCK_EVENT_READABLE 0x0001 /**< interested in readable */
+#define SOCK_EVENT_WRITABLE 0x0002 /**< interested in writable */
+
+/** Bitmask of possible event interests for a socket. */
+#define SOCK_EVENT_MASK (SOCK_EVENT_READABLE | SOCK_EVENT_WRITABLE)
+
+#define SOCK_ACTION_SET 0x0000 /**< set interest set as follows */
+#define SOCK_ACTION_ADD 0x1000 /**< add to interest set */
+#define SOCK_ACTION_DEL 0x2000 /**< remove from interest set */
+
+#define SOCK_ACTION_MASK 0x3000 /**< mask out the actions */
+
+/** Retrieve state of the Socket \a sock. */
+#define s_state(sock) ((sock)->s_state)
+/** Retrieve interest mask of the Socket \a sock. */
+#define s_events(sock) ((sock)->s_events)
+/** Retrieve file descriptor of the Socket \a sock. */
+#define s_fd(sock) ((sock)->s_fd)
+/** Retrieve user data pointer of the Socket \a sock. */
+#define s_data(sock) ((sock)->s_header.gh_data)
+/** Retrieve engine data integer of the Socket \a sock. */
+#define s_ed_int(sock) ((sock)->s_header.gh_engdata.ed_int)
+/** Retrieve engine data pointer of the Socket \a sock. */
+#define s_ed_ptr(sock) ((sock)->s_header.gh_engdata.ed_ptr)
+/** Retrieve whether the Socket \a sock is active. */
+#define s_active(sock) ((sock)->s_header.gh_flags & GEN_ACTIVE)
+
+/** Signal event generator. */
+struct Signal {
+ struct GenHeader sig_header; /**< generator information */
+ int sig_signal; /**< signal number */
+};
+
+/** Retrieve signal number of the Signal \a sig. */
+#define sig_signal(sig) ((sig)->sig_signal)
+/** Retrieve user data pointer of the Signal \a sig. */
+#define sig_data(sig) ((sig)->sig_header.gh_data)
+/** Retrieve engine data integer of the Signal \a sig. */
+#define sig_ed_int(sig) ((sig)->sig_header.gh_engdata.ed_int)
+/** Retrieve engine data pointer of the Signal \a sig. */
+#define sig_ed_ptr(sig) ((sig)->sig_header.gh_engdata.ed_ptr)
+/** Retrieve whether the Signal \a sig is active. */
+#define sig_active(sig) ((sig)->sig_header.gh_flags & GEN_ACTIVE)
+
+/** Timer event generator. */
+struct Timer {
+ struct GenHeader t_header; /**< generator information */
+ enum TimerType t_type; /**< what type of timer this is */
+ time_t t_value; /**< value timer was added with */
+ time_t t_expire; /**< time at which timer expires */
+};
+
+/** Retrieve type of the Timer \a tim. */
+#define t_type(tim) ((tim)->t_type)
+/** Retrieve interval of the Timer \a tim. */
+#define t_value(tim) ((tim)->t_value)
+/** Retrieve expiration time of the Timer \a tim. */
+#define t_expire(tim) ((tim)->t_expire)
+/** Retrieve user data pointer of the Timer \a tim. */
+#define t_data(tim) ((tim)->t_header.gh_data)
+/** Retrieve engine data integer of the Timer \a tim. */
+#define t_ed_int(tim) ((tim)->t_header.gh_engdata.ed_int)
+/** Retrieve engine data pointer of the Timer \a tim. */
+#define t_ed_ptr(tim) ((tim)->t_header.gh_engdata.ed_ptr)
+/** Retrieve whether the Timer \a tim is active. */
+#define t_active(tim) ((tim)->t_header.gh_flags & GEN_ACTIVE)
+/** Retrieve whether the Timer \a tim is enqueued. */
+#define t_onqueue(tim) ((tim)->t_header.gh_prev_p)
+
+/** Event activity descriptor. */
+struct Event {
+ struct Event* ev_next; /**< linked list of events on queue */
+ struct Event** ev_prev_p; /**< previous pointer to this event */
+ enum EventType ev_type; /**< Event type */
+ int ev_data; /**< extra data, like errno value */
+ union {
+ struct GenHeader* gen_header; /**< Generator header */
+ struct Socket* gen_socket; /**< Socket generating event */
+ struct Signal* gen_signal; /**< Signal generating event */
+ struct Timer* gen_timer; /**< Timer generating event */
+ } ev_gen; /**< object generating event */
+};
+
+/** Retrieve the type of the Event \a ev. */
+#define ev_type(ev) ((ev)->ev_type)
+/** Retrieve the extra data of the Event \a ev. */
+#define ev_data(ev) ((ev)->ev_data)
+/** Retrieve the Socket that generated the Event \a ev. */
+#define ev_socket(ev) ((ev)->ev_gen.gen_socket)
+/** Retrieve the Signal that generated the Event \a ev. */
+#define ev_signal(ev) ((ev)->ev_gen.gen_signal)
+/** Retrieve the Timer that generated the Event \a ev. */
+#define ev_timer(ev) ((ev)->ev_gen.gen_timer)
+
+/** List of all event generators. */
+struct Generators {
+ struct GenHeader* g_socket; /**< list of socket generators */
+ struct GenHeader* g_signal; /**< list of signal generators */
+ struct GenHeader* g_timer; /**< list of timer generators */
+};
+
+/** Returns 1 if successfully initialized, 0 if not.
+ * @param[in] max_sockets Number of sockets to support.
+ */
+typedef int (*EngineInit)(int max_sockets);
+
+/** Tell engine about new signal.
+ * @param[in] sig Signal event generator to add.
+ */
+typedef void (*EngineSignal)(struct Signal* sig);
+
+/** Tell engine about new socket.
+ * @param[in] sock Socket event generator to add.
+ */
+typedef int (*EngineAdd)(struct Socket* sock);
+
+/** Tell engine about socket's new_state.
+ * @param[in] sock Socket whose state is changing.
+ * @param[in] new_state New state for socket.
+ */
+typedef void (*EngineState)(struct Socket* sock, enum SocketState new_state);
+
+/** Tell engine about socket's new event interests.
+ * @param[in] sock Socket whose interest mask is changing.
+ * @param[in] new_events New event mask to set (not SOCK_ACTION_ADD or SOCK_ACTION_DEL).
+ */
+typedef void (*EngineEvents)(struct Socket* sock, unsigned int new_events);
+
+/** Tell engine a socket is going away.
+ * @param[in] sock Socket being destroyed.
+ */
+typedef void (*EngineDelete)(struct Socket* sock);
+
+/** The actual event loop.
+ * @param[in] gens List of event generators.
+ */
+typedef void (*EngineLoop)(struct Generators* gens);
+
+/** Structure for an event engine to describe itself. */
+struct Engine {
+ const char* eng_name; /**< a name for the engine */
+ EngineInit eng_init; /**< initialize engine */
+ EngineSignal eng_signal; /**< express interest in a signal (may be NULL) */
+ EngineAdd eng_add; /**< express interest in a socket */
+ EngineState eng_state; /**< mention a change in state to engine */
+ EngineEvents eng_events; /**< express interest in socket events */
+ EngineDelete eng_closing; /**< socket is being closed */
+ EngineLoop eng_loop; /**< actual event loop */
+};
+
+/** Increment the reference count of \a gen. */
+#define gen_ref_inc(gen) (((struct GenHeader*) (gen))->gh_ref++)
+/** Decrement the reference count of \a gen. */
+#define gen_ref_dec(gen) \
+do { \
+ struct GenHeader* _gen = (struct GenHeader*) (gen); \
+ if (!--_gen->gh_ref && (_gen->gh_flags & GEN_DESTROY)) { \
+ gen_dequeue(_gen); \
+ event_generate(ET_DESTROY, _gen, 0); \
+ } \
+} while (0)
+/** Clear the error flag for \a gen. */
+#define gen_clear_error(gen) \
+ (((struct GenHeader*) (gen))->gh_flags &= ~GEN_ERROR)
+
+void gen_dequeue(void* arg);
+
+void event_init(int max_sockets);
+void event_loop(void);
+void event_generate(enum EventType type, void* arg, int data);
+
+struct Timer* timer_init(struct Timer* timer);
+void timer_add(struct Timer* timer, EventCallBack call, void* data,
+ enum TimerType type, time_t value);
+void timer_del(struct Timer* timer);
+void timer_chg(struct Timer* timer, enum TimerType type, time_t value);
+void timer_run(void);
+/** Retrieve the next timer's expiration time from Generators \a gen. */
+#define timer_next(gen) ((gen)->g_timer ? ((struct Timer*)(gen)->g_timer)->t_expire : 0)
+
+void signal_add(struct Signal* signal, EventCallBack call, void* data,
+ int sig);
+
+int socket_add(struct Socket* sock, EventCallBack call, void* data,
+ enum SocketState state, unsigned int events, int fd);
+void socket_del(struct Socket* sock);
+void socket_state(struct Socket* sock, enum SocketState state);
+void socket_events(struct Socket* sock, unsigned int events);
+
+const char* engine_name(void);
+
+#ifdef DEBUGMODE
+/* These routines pretty-print names for states and types for debug printing */
+
+const char* state_to_name(enum SocketState state);
+const char* timer_to_name(enum TimerType type);
+const char* event_to_name(enum EventType type);
+const char* gen_flags(unsigned int flags);
+const char* sock_flags(unsigned int flags);
+
+#endif /* DEBUGMODE */
+
+#endif /* INCLUDED_ircd_events_h */
projects / ircu2.10.12-pk.git / blobdiff