342 lines
11 KiB
C
342 lines
11 KiB
C
/*
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* Copyright (c) 2000-2004 Niels Provos <provos@citi.umich.edu>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _EVENT_H_
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#define _EVENT_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stdarg.h>
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#ifdef WIN32
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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#undef WIN32_LEAN_AND_MEAN
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typedef unsigned char u_char;
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typedef unsigned short u_short;
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#endif
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#define EVLIST_TIMEOUT 0x01
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#define EVLIST_INSERTED 0x02
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#define EVLIST_SIGNAL 0x04
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#define EVLIST_ACTIVE 0x08
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#define EVLIST_INTERNAL 0x10
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#define EVLIST_INIT 0x80
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/* EVLIST_X_ Private space: 0x1000-0xf000 */
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#define EVLIST_ALL (0xf000 | 0x9f)
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#define EV_TIMEOUT 0x01
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#define EV_READ 0x02
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#define EV_WRITE 0x04
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#define EV_SIGNAL 0x08
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#define EV_PERSIST 0x10 /* Persistant event */
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/* Fix so that ppl dont have to run with <sys/queue.h> */
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#ifndef TAILQ_ENTRY
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#define _EVENT_DEFINED_TQENTRY
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#define TAILQ_ENTRY(type) \
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struct { \
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struct type *tqe_next; /* next element */ \
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struct type **tqe_prev; /* address of previous next element */ \
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}
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#endif /* !TAILQ_ENTRY */
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#ifndef RB_ENTRY
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#define _EVENT_DEFINED_RBENTRY
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#define RB_ENTRY(type) \
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struct { \
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struct type *rbe_left; /* left element */ \
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struct type *rbe_right; /* right element */ \
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struct type *rbe_parent; /* parent element */ \
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int rbe_color; /* node color */ \
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}
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#endif /* !RB_ENTRY */
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struct event_base;
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struct event {
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TAILQ_ENTRY (event) ev_next;
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TAILQ_ENTRY (event) ev_active_next;
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TAILQ_ENTRY (event) ev_signal_next;
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RB_ENTRY (event) ev_timeout_node;
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struct event_base *ev_base;
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int ev_fd;
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short ev_events;
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short ev_ncalls;
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short *ev_pncalls; /* Allows deletes in callback */
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struct timeval ev_timeout;
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int ev_pri; /* smaller numbers are higher priority */
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void (*ev_callback)(int, short, void *arg);
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void *ev_arg;
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int ev_res; /* result passed to event callback */
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int ev_flags;
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};
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#define EVENT_SIGNAL(ev) (int)(ev)->ev_fd
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#define EVENT_FD(ev) (int)(ev)->ev_fd
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/*
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* Key-Value pairs. Can be used for HTTP headers but also for
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* query argument parsing.
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*/
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struct evkeyval {
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TAILQ_ENTRY(evkeyval) next;
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char *key;
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char *value;
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};
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#ifdef _EVENT_DEFINED_TQENTRY
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#undef TAILQ_ENTRY
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struct event_list;
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struct evkeyvalq;
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#undef _EVENT_DEFINED_TQENTRY
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#else
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TAILQ_HEAD (event_list, event);
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TAILQ_HEAD (evkeyvalq, evkeyval);
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#endif /* _EVENT_DEFINED_TQENTRY */
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#ifdef _EVENT_DEFINED_RBENTRY
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#undef RB_ENTRY
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#undef _EVENT_DEFINED_RBENTRY
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#endif /* _EVENT_DEFINED_RBENTRY */
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struct eventop {
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char *name;
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void *(*init)(void);
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int (*add)(void *, struct event *);
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int (*del)(void *, struct event *);
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int (*recalc)(struct event_base *, void *, int);
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int (*dispatch)(struct event_base *, void *, struct timeval *);
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void (*dealloc)(void *);
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};
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#define TIMEOUT_DEFAULT {5, 0}
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void *event_init(void);
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int event_dispatch(void);
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int event_base_dispatch(struct event_base *);
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void event_base_free(struct event_base *);
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#define _EVENT_LOG_DEBUG 0
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#define _EVENT_LOG_MSG 1
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#define _EVENT_LOG_WARN 2
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#define _EVENT_LOG_ERR 3
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typedef void (*event_log_cb)(int severity, const char *msg);
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void event_set_log_callback(event_log_cb cb);
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/* Associate a different event base with an event */
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int event_base_set(struct event_base *, struct event *);
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#define EVLOOP_ONCE 0x01
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#define EVLOOP_NONBLOCK 0x02
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int event_loop(int);
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int event_base_loop(struct event_base *, int);
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int event_loopexit(struct timeval *); /* Causes the loop to exit */
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int event_base_loopexit(struct event_base *, struct timeval *);
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#define evtimer_add(ev, tv) event_add(ev, tv)
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#define evtimer_set(ev, cb, arg) event_set(ev, -1, 0, cb, arg)
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#define evtimer_del(ev) event_del(ev)
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#define evtimer_pending(ev, tv) event_pending(ev, EV_TIMEOUT, tv)
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#define evtimer_initialized(ev) ((ev)->ev_flags & EVLIST_INIT)
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#define timeout_add(ev, tv) event_add(ev, tv)
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#define timeout_set(ev, cb, arg) event_set(ev, -1, 0, cb, arg)
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#define timeout_del(ev) event_del(ev)
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#define timeout_pending(ev, tv) event_pending(ev, EV_TIMEOUT, tv)
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#define timeout_initialized(ev) ((ev)->ev_flags & EVLIST_INIT)
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#define signal_add(ev, tv) event_add(ev, tv)
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#define signal_set(ev, x, cb, arg) \
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event_set(ev, x, EV_SIGNAL|EV_PERSIST, cb, arg)
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#define signal_del(ev) event_del(ev)
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#define signal_pending(ev, tv) event_pending(ev, EV_SIGNAL, tv)
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#define signal_initialized(ev) ((ev)->ev_flags & EVLIST_INIT)
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void event_set(struct event *, int, short, void (*)(int, short, void *), void *);
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int event_once(int, short, void (*)(int, short, void *), void *, struct timeval *);
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int event_add(struct event *, struct timeval *);
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int event_del(struct event *);
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void event_active(struct event *, int, short);
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int event_pending(struct event *, short, struct timeval *);
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#ifdef WIN32
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#define event_initialized(ev) ((ev)->ev_flags & EVLIST_INIT && (ev)->ev_fd != (int)INVALID_HANDLE_VALUE)
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#else
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#define event_initialized(ev) ((ev)->ev_flags & EVLIST_INIT)
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#endif
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/* Some simple debugging functions */
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const char *event_get_version(void);
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const char *event_get_method(void);
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/* These functions deal with event priorities */
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int event_priority_init(int);
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int event_base_priority_init(struct event_base *, int);
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int event_priority_set(struct event *, int);
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/* These functions deal with buffering input and output */
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struct evbuffer {
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u_char *buffer;
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u_char *orig_buffer;
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size_t misalign;
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size_t totallen;
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size_t off;
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void (*cb)(struct evbuffer *, size_t, size_t, void *);
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void *cbarg;
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};
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/* Just for error reporting - use other constants otherwise */
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#define EVBUFFER_READ 0x01
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#define EVBUFFER_WRITE 0x02
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#define EVBUFFER_EOF 0x10
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#define EVBUFFER_ERROR 0x20
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#define EVBUFFER_TIMEOUT 0x40
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struct bufferevent;
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typedef void (*evbuffercb)(struct bufferevent *, void *);
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typedef void (*everrorcb)(struct bufferevent *, short what, void *);
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struct event_watermark {
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size_t low;
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size_t high;
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};
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struct bufferevent {
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struct event ev_read;
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struct event ev_write;
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struct evbuffer *input;
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struct evbuffer *output;
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struct event_watermark wm_read;
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struct event_watermark wm_write;
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evbuffercb readcb;
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evbuffercb writecb;
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everrorcb errorcb;
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void *cbarg;
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int timeout_read; /* in seconds */
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int timeout_write; /* in seconds */
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short enabled; /* events that are currently enabled */
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};
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struct bufferevent *bufferevent_new(int fd,
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evbuffercb readcb, evbuffercb writecb, everrorcb errorcb, void *cbarg);
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int bufferevent_base_set(struct event_base *base, struct bufferevent *bufev);
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int bufferevent_priority_set(struct bufferevent *bufev, int pri);
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void bufferevent_free(struct bufferevent *bufev);
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int bufferevent_write(struct bufferevent *bufev, void *data, size_t size);
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int bufferevent_write_buffer(struct bufferevent *bufev, struct evbuffer *buf);
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size_t bufferevent_read(struct bufferevent *bufev, void *data, size_t size);
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int bufferevent_enable(struct bufferevent *bufev, short event);
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int bufferevent_disable(struct bufferevent *bufev, short event);
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void bufferevent_settimeout(struct bufferevent *bufev,
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int timeout_read, int timeout_write);
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#define EVBUFFER_LENGTH(x) (x)->off
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#define EVBUFFER_DATA(x) (x)->buffer
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#define EVBUFFER_INPUT(x) (x)->input
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#define EVBUFFER_OUTPUT(x) (x)->output
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struct evbuffer *evbuffer_new(void);
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void evbuffer_free(struct evbuffer *);
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int evbuffer_expand(struct evbuffer *, size_t);
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int evbuffer_add(struct evbuffer *, const void *, size_t);
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int evbuffer_remove(struct evbuffer *, void *, size_t);
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char *evbuffer_readline(struct evbuffer *);
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int evbuffer_add_buffer(struct evbuffer *, struct evbuffer *);
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int evbuffer_add_printf(struct evbuffer *, const char *fmt, ...);
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int evbuffer_add_vprintf(struct evbuffer *, const char *fmt, va_list ap);
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void evbuffer_drain(struct evbuffer *, size_t);
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int evbuffer_write(struct evbuffer *, int);
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int evbuffer_read(struct evbuffer *, int, int);
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u_char *evbuffer_find(struct evbuffer *, const u_char *, size_t);
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void evbuffer_setcb(struct evbuffer *, void (*)(struct evbuffer *, size_t, size_t, void *), void *);
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/*
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* Marshaling tagged data - We assume that all tags are inserted in their
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* numeric order - so that unknown tags will always be higher than the
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* known ones - and we can just ignore the end of an event buffer.
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*/
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void evtag_init(void);
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void evtag_marshal(struct evbuffer *evbuf, u_int8_t tag, const void *data,
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u_int32_t len);
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void encode_int(struct evbuffer *evbuf, u_int32_t number);
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void evtag_marshal_int(struct evbuffer *evbuf, u_int8_t tag,
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u_int32_t integer);
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void evtag_marshal_string(struct evbuffer *buf, u_int8_t tag,
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const char *string);
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void evtag_marshal_timeval(struct evbuffer *evbuf, u_int8_t tag,
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struct timeval *tv);
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void evtag_test(void);
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int evtag_unmarshal(struct evbuffer *src, u_int8_t *ptag,
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struct evbuffer *dst);
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int evtag_peek(struct evbuffer *evbuf, u_int8_t *ptag);
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int evtag_peek_length(struct evbuffer *evbuf, u_int32_t *plength);
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int evtag_payload_length(struct evbuffer *evbuf, u_int32_t *plength);
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int evtag_consume(struct evbuffer *evbuf);
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int evtag_unmarshal_int(struct evbuffer *evbuf, u_int8_t need_tag,
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u_int32_t *pinteger);
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int evtag_unmarshal_fixed(struct evbuffer *src, u_int8_t need_tag, void *data,
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size_t len);
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int evtag_unmarshal_string(struct evbuffer *evbuf, u_int8_t need_tag,
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char **pstring);
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int evtag_unmarshal_timeval(struct evbuffer *evbuf, u_int8_t need_tag,
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struct timeval *ptv);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _EVENT_H_ */
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