libev/ev.h

/*
 * Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *
 *     * Redistributions in binary form must reproduce the above
 *       copyright notice, this list of conditions and the following
 *       disclaimer in the documentation and/or other materials provided
 *       with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef EV_H__
#define EV_H__

#ifdef __cplusplus
extern "C" {
#endif

typedef double ev_tstamp;

/* these priorities are inclusive, higher priorities will be called earlier */
#ifndef EV_MINPRI
# define EV_MINPRI -2
#endif
#ifndef EV_MAXPRI
# define EV_MAXPRI +2
#endif

#ifndef EV_MULTIPLICITY
# define EV_MULTIPLICITY 1
#endif

#ifndef EV_PERIODIC_ENABLE
# define EV_PERIODIC_ENABLE 1
#endif

#ifndef EV_STAT_ENABLE
# define EV_STAT_ENABLE 1
#endif

#ifndef EV_IDLE_ENABLE
# define EV_IDLE_ENABLE 1
#endif

#ifndef EV_FORK_ENABLE
# define EV_FORK_ENABLE 1
#endif

#ifndef EV_EMBED_ENABLE
# define EV_EMBED_ENABLE 1
#endif

/*****************************************************************************/

#if EV_STAT_ENABLE
# include <sys/stat.h>
#endif

/* support multiple event loops? */
#if EV_MULTIPLICITY
struct ev_loop;
# define EV_P struct ev_loop *loop
# define EV_P_ EV_P,
# define EV_A loop
# define EV_A_ EV_A,
# define EV_DEFAULT ev_default_loop (0)
# define EV_DEFAULT_ EV_DEFAULT,
#else
# define EV_P void
# define EV_P_
# define EV_A
# define EV_A_
# define EV_DEFAULT
# define EV_DEFAULT_

# undef EV_EMBED_ENABLE
#endif

/* eventmask, revents, events... */
#define EV_UNDEF            -1L /* guaranteed to be invalid */
#define EV_NONE           0x00L /* no events */
#define EV_READ           0x01L /* ev_io detected read will not block */
#define EV_WRITE          0x02L /* ev_io detected write will not block */
#define EV_IOFDSET        0x80L /* internal use only */
#define EV_TIMEOUT  0x00000100L /* timer timed out */
#define EV_PERIODIC 0x00000200L /* periodic timer timed out */
#define EV_SIGNAL   0x00000400L /* signal was received */
#define EV_CHILD    0x00000800L /* child/pid had status change */
#define EV_STAT     0x00001000L /* stat data changed */
#define EV_IDLE     0x00002000L /* event loop is idling */
#define EV_PREPARE  0x00004000L /* event loop about to poll */
#define EV_CHECK    0x00008000L /* event loop finished poll */
#define EV_EMBED    0x00010000L /* embedded event loop needs sweep */
#define EV_FORK     0x00020000L /* event loop resumed in child */
#define EV_ERROR    0x80000000L /* sent when an error occurs */

/* can be used to add custom fields to all watchers, while losing binary compatibility */
#ifndef EV_COMMON
# define EV_COMMON void *data;
#endif
#ifndef EV_PROTOTYPES
# define EV_PROTOTYPES 1
#endif

#define EV_VERSION_MAJOR 2
#define EV_VERSION_MINOR 0

#ifndef EV_CB_DECLARE
# define EV_CB_DECLARE(type) void (*cb)(EV_P_ struct type *w, int revents);
#endif
#ifndef EV_CB_INVOKE
# define EV_CB_INVOKE(watcher,revents) (watcher)->cb (EV_A_ (watcher), (revents))
#endif

/*
 * struct member types:
 * private: you can look at them, but not change them, and they might not mean anything to you.
 * ro: can be read anytime, but only changed when the watcher isn't active
 * rw: can be read and modified anytime, even when the watcher is active
 */

/* shared by all watchers */
#define EV_WATCHER(type)                        \
  int active; /* private */                     \
  int pending; /* private */                    \
  int priority; /* private */                   \
  EV_COMMON /* rw */                            \
  EV_CB_DECLARE (type) /* private */

#define EV_WATCHER_LIST(type)                   \
  EV_WATCHER (type)                             \
  struct ev_watcher_list *next; /* private */

#define EV_WATCHER_TIME(type)                   \
  EV_WATCHER (type)                             \
  ev_tstamp at;     /* private */

/* base class, nothing to see here unless you subclass */
typedef struct ev_watcher
{
  EV_WATCHER (ev_watcher)
} ev_watcher;

/* base class, nothing to see here unless you subclass */
typedef struct ev_watcher_list
{
  EV_WATCHER_LIST (ev_watcher_list)
} ev_watcher_list;

/* base class, nothing to see here unless you subclass */
typedef struct ev_watcher_time
{
  EV_WATCHER_TIME (ev_watcher_time)
} ev_watcher_time;

/* invoked when fd is either EV_READable or EV_WRITEable */
/* revent EV_READ, EV_WRITE */
typedef struct ev_io
{
  EV_WATCHER_LIST (ev_io)

  int fd;     /* ro */
  int events; /* ro */
} ev_io;

/* invoked after a specific time, repeatable (based on monotonic clock) */
/* revent EV_TIMEOUT */
typedef struct ev_timer
{
  EV_WATCHER_TIME (ev_timer)

  ev_tstamp repeat; /* rw */
} ev_timer;

/* invoked at some specific time, possibly repeating at regular intervals (based on UTC) */
/* revent EV_PERIODIC */
typedef struct ev_periodic
{
  EV_WATCHER_TIME (ev_periodic)

  ev_tstamp offset; /* rw */
  ev_tstamp interval; /* rw */
  ev_tstamp (*reschedule_cb)(struct ev_periodic *w, ev_tstamp now); /* rw */
} ev_periodic;

/* invoked when the given signal has been received */
/* revent EV_SIGNAL */
typedef struct ev_signal
{
  EV_WATCHER_LIST (ev_signal)

  int signum; /* ro */
} ev_signal;

/* invoked when sigchld is received and waitpid indicates the given pid */
/* revent EV_CHILD */
/* does not support priorities */
typedef struct ev_child
{
  EV_WATCHER_LIST (ev_child)

  int pid;     /* ro */
  int rpid;    /* rw, holds the received pid */
  int rstatus; /* rw, holds the exit status, use the macros from sys/wait.h */
} ev_child;

#if EV_STAT_ENABLE
/* st_nlink = 0 means missing file or other error */
# ifdef _WIN32
typedef struct _stati64 ev_statdata;
# else
typedef struct stat ev_statdata;
# endif

/* invoked each time the stat data changes for a given path */
/* revent EV_STAT */
typedef struct ev_stat
{
  EV_WATCHER_LIST (ev_stat)

  ev_timer timer;     /* private */
  ev_tstamp interval; /* ro */
  const char *path;   /* ro */
  ev_statdata prev;   /* ro */
  ev_statdata attr;   /* ro */

  int wd; /* wd for inotify, fd for kqueue */
} ev_stat;
#endif

#if EV_IDLE_ENABLE
/* invoked when the nothing else needs to be done, keeps the process from blocking */
/* revent EV_IDLE */
typedef struct ev_idle
{
  EV_WATCHER (ev_idle)
} ev_idle;
#endif

/* invoked for each run of the mainloop, just before the blocking call */
/* you can still change events in any way you like */
/* revent EV_PREPARE */
typedef struct ev_prepare
{
  EV_WATCHER (ev_prepare)
} ev_prepare;

/* invoked for each run of the mainloop, just after the blocking call */
/* revent EV_CHECK */
typedef struct ev_check
{
  EV_WATCHER (ev_check)
} ev_check;

#if EV_FORK_ENABLE
/* the callback gets invoked before check in the child process when a fork was detected */
typedef struct ev_fork
{
  EV_WATCHER (ev_fork)
} ev_fork;
#endif

#if EV_EMBED_ENABLE
/* used to embed an event loop inside another */
/* the callback gets invoked when the event loop has handled events, and can be 0 */
typedef struct ev_embed
{
  EV_WATCHER (ev_embed)

  ev_io io; /* private */
  struct ev_loop *loop; /* ro */
} ev_embed;
#endif

/* the presence of this union forces similar struct layout */
union ev_any_watcher
{
  struct ev_watcher w;
  struct ev_watcher_list wl;

  struct ev_io io;
  struct ev_timer timer;
  struct ev_periodic periodic;
  struct ev_signal signal;
  struct ev_child child;
#if EV_STAT_ENABLE
  struct ev_stat stat;
#endif
#if EV_IDLE_ENABLE
  struct ev_idle idle;
#endif
  struct ev_prepare prepare;
  struct ev_check check;
#if EV_FORK_ENABLE
  struct ev_fork fork;
#endif
#if EV_EMBED_ENABLE
  struct ev_embed embed;
#endif
};

/* bits for ev_default_loop and ev_loop_new */
/* the default */
#define EVFLAG_AUTO       0x00000000UL /* not quite a mask */
/* flag bits */
#define EVFLAG_NOENV      0x01000000UL /* do NOT consult environment */
#define EVFLAG_FORKCHECK  0x02000000UL /* check for a fork in each iteration */
/* method bits to be ored together */
#define EVBACKEND_SELECT  0x00000001UL /* about anywhere */
#define EVBACKEND_POLL    0x00000002UL /* !win */
#define EVBACKEND_EPOLL   0x00000004UL /* linux */
#define EVBACKEND_KQUEUE  0x00000008UL /* bsd */
#define EVBACKEND_DEVPOLL 0x00000010UL /* solaris 8 */ /* NYI */
#define EVBACKEND_PORT    0x00000020UL /* solaris 10 */

#if EV_PROTOTYPES
int ev_version_major (void);
int ev_version_minor (void);

unsigned int ev_supported_backends (void);
unsigned int ev_recommended_backends (void);
unsigned int ev_embeddable_backends (void);

ev_tstamp ev_time (void);

/* Sets the allocation function to use, works like realloc.
 * It is used to allocate and free memory.
 * If it returns zero when memory needs to be allocated, the library might abort
 * or take some potentially destructive action.
 * The default is your system realloc function.
 */
void ev_set_allocator (void *(*cb)(void *ptr, long size));

/* set the callback function to call on a
 * retryable syscall error
 * (such as failed select, poll, epoll_wait)
 */
void ev_set_syserr_cb (void (*cb)(const char *msg));

# if EV_MULTIPLICITY
/* the default loop is the only one that handles signals and child watchers */
/* you can call this as often as you like */
static struct ev_loop *
ev_default_loop (unsigned int flags)
{
  extern struct ev_loop *ev_default_loop_ptr;
  extern struct ev_loop *ev_default_loop_init (unsigned int flags);

  if (!ev_default_loop_ptr)
    ev_default_loop_init (flags);

  return ev_default_loop_ptr;
}

/* create and destroy alternative loops that don't handle signals */
struct ev_loop *ev_loop_new (unsigned int flags);
void ev_loop_destroy (EV_P);
void ev_loop_fork (EV_P);

ev_tstamp ev_now (EV_P); /* time w.r.t. timers and the eventloop, updated after each poll */

# else

int ev_default_loop (unsigned int flags); /* returns true when successful */

static ev_tstamp
ev_now (void)
{
  extern ev_tstamp ev_rt_now;

  return ev_rt_now;
}
# endif

void ev_default_destroy (void); /* destroy the default loop */
/* this needs to be called after fork, to duplicate the default loop */
/* if you create alternative loops you have to call ev_loop_fork on them */
/* you can call it in either the parent or the child */
/* you can actually call it at any time, anywhere :) */
void ev_default_fork (void);

unsigned int ev_backend (EV_P);
unsigned int ev_loop_count (EV_P);
#endif

#define EVLOOP_NONBLOCK 1 /* do not block/wait */
#define EVLOOP_ONESHOT  2 /* block *once* only */
#define EVUNLOOP_CANCEL 0 /* undo unloop */
#define EVUNLOOP_ONE    1 /* unloop once */
#define EVUNLOOP_ALL    2 /* unloop all loops */

#if EV_PROTOTYPES
void ev_loop (EV_P_ int flags);
void ev_unloop (EV_P_ int how); /* set to 1 to break out of event loop, set to 2 to break out of all event loops */

/*
 * ref/unref can be used to add or remove a refcount on the mainloop. every watcher
 * keeps one reference. if you have a long-runing watcher you never unregister that
 * should not keep ev_loop from running, unref() after starting, and ref() before stopping.
 */
void ev_ref   (EV_P);
void ev_unref (EV_P);

/* convinience function, wait for a single event, without registering an event watcher */
/* if timeout is < 0, do wait indefinitely */
void ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (*cb)(int revents, void *arg), void *arg);
#endif

/* these may evaluate ev multiple times, and the other arguments at most once */
/* either use ev_init + ev_TYPE_set, or the ev_TYPE_init macro, below, to first initialise a watcher */
#define ev_init(ev,cb_) do {                    \
  ((ev_watcher *)(void *)(ev))->active   =      \
  ((ev_watcher *)(void *)(ev))->pending  =      \
  ((ev_watcher *)(void *)(ev))->priority = 0;   \
  ev_set_cb ((ev), cb_);                        \
} while (0)

#define ev_io_set(ev,fd_,events_)           do { (ev)->fd = (fd_); (ev)->events = (events_) | EV_IOFDSET; } while (0)
#define ev_timer_set(ev,after_,repeat_)     do { (ev)->at = (after_); (ev)->repeat = (repeat_); } while (0)
#define ev_periodic_set(ev,ofs_,ival_,res_) do { (ev)->offset = (ofs_); (ev)->interval = (ival_); (ev)->reschedule_cb= (res_); } while (0)
#define ev_signal_set(ev,signum_)           do { (ev)->signum = (signum_); } while (0)
#define ev_child_set(ev,pid_)               do { (ev)->pid = (pid_); } while (0)
#define ev_stat_set(ev,path_,interval_)     do { (ev)->path = (path_); (ev)->interval = (interval_); (ev)->wd = -2; } while (0)
#define ev_idle_set(ev)                     /* nop, yes, this is a serious in-joke */
#define ev_prepare_set(ev)                  /* nop, yes, this is a serious in-joke */
#define ev_check_set(ev)                    /* nop, yes, this is a serious in-joke */
#define ev_embed_set(ev,loop_)              do { (ev)->loop = (loop_); } while (0)
#define ev_fork_set(ev)                     /* nop, yes, this is a serious in-joke */

#define ev_io_init(ev,cb,fd,events)         do { ev_init ((ev), (cb)); ev_io_set ((ev),(fd),(events)); } while (0)
#define ev_timer_init(ev,cb,after,repeat)   do { ev_init ((ev), (cb)); ev_timer_set ((ev),(after),(repeat)); } while (0)
#define ev_periodic_init(ev,cb,at,ival,res) do { ev_init ((ev), (cb)); ev_periodic_set ((ev),(at),(ival),(res)); } while (0)
#define ev_signal_init(ev,cb,signum)        do { ev_init ((ev), (cb)); ev_signal_set ((ev), (signum)); } while (0)
#define ev_child_init(ev,cb,pid)            do { ev_init ((ev), (cb)); ev_child_set ((ev),(pid)); } while (0)
#define ev_stat_init(ev,cb,path,interval)   do { ev_init ((ev), (cb)); ev_path_set ((ev),(path),(interval)); } while (0)
#define ev_idle_init(ev,cb)                 do { ev_init ((ev), (cb)); ev_idle_set ((ev)); } while (0)
#define ev_prepare_init(ev,cb)              do { ev_init ((ev), (cb)); ev_prepare_set ((ev)); } while (0)
#define ev_check_init(ev,cb)                do { ev_init ((ev), (cb)); ev_check_set ((ev)); } while (0)
#define ev_embed_init(ev,cb,loop)           do { ev_init ((ev), (cb)); ev_embed_set ((ev),(loop)); } while (0)
#define ev_fork_init(ev,cb)                 do { ev_init ((ev), (cb)); ev_fork_set ((ev)); } while (0)

#define ev_is_pending(ev)                   (0 + ((ev_watcher *)(void *)(ev))->pending) /* ro, true when watcher is waiting for callback invocation */
#define ev_is_active(ev)                    (0 + ((ev_watcher *)(void *)(ev))->active) /* ro, true when the watcher has been started */

#define ev_priority(ev)                     ((((ev_watcher *)(void *)(ev))->priority) + 0)
#define ev_cb(ev)                           (ev)->cb /* rw */
#define ev_set_priority(ev,pri)             ((ev_watcher *)(void *)(ev))->priority = (pri)

#ifndef ev_set_cb
# define ev_set_cb(ev,cb_)                  ev_cb (ev) = (cb_)
#endif

/* stopping (enabling, adding) a watcher does nothing if it is already running */
/* stopping (disabling, deleting) a watcher does nothing unless its already running */
#if EV_PROTOTYPES

/* feeds an event into a watcher as if the event actually occured */
/* accepts any ev_watcher type */
void ev_feed_event     (EV_P_ void *w, int revents);
void ev_feed_fd_event  (EV_P_ int fd, int revents);
void ev_feed_signal_event (EV_P_ int signum);
void ev_invoke         (EV_P_ void *w, int revents);
int  ev_clear_pending  (EV_P_ void *w);

void ev_io_start       (EV_P_ ev_io *w);
void ev_io_stop        (EV_P_ ev_io *w);

void ev_timer_start    (EV_P_ ev_timer *w);
void ev_timer_stop     (EV_P_ ev_timer *w);
/* stops if active and no repeat, restarts if active and repeating, starts if inactive and repeating */
void ev_timer_again    (EV_P_ ev_timer *w);

#if EV_PERIODIC_ENABLE
void ev_periodic_start (EV_P_ ev_periodic *w);
void ev_periodic_stop  (EV_P_ ev_periodic *w);
void ev_periodic_again (EV_P_ ev_periodic *w);
#endif

/* only supported in the default loop */
void ev_signal_start   (EV_P_ ev_signal *w);
void ev_signal_stop    (EV_P_ ev_signal *w);

/* only supported in the default loop */
void ev_child_start    (EV_P_ ev_child *w);
void ev_child_stop     (EV_P_ ev_child *w);

# if EV_STAT_ENABLE
void ev_stat_start     (EV_P_ ev_stat *w);
void ev_stat_stop      (EV_P_ ev_stat *w);
void ev_stat_stat      (EV_P_ ev_stat *w);
# endif

# if EV_IDLE_ENABLE
void ev_idle_start     (EV_P_ ev_idle *w);
void ev_idle_stop      (EV_P_ ev_idle *w);
# endif

void ev_prepare_start  (EV_P_ ev_prepare *w);
void ev_prepare_stop   (EV_P_ ev_prepare *w);

void ev_check_start    (EV_P_ ev_check *w);
void ev_check_stop     (EV_P_ ev_check *w);

# if EV_FORK_ENABLE
void ev_fork_start     (EV_P_ ev_fork *w);
void ev_fork_stop      (EV_P_ ev_fork *w);
# endif

# if EV_EMBED_ENABLE
/* only supported when loop to be embedded is in fact embeddable */
void ev_embed_start    (EV_P_ ev_embed *w);
void ev_embed_stop     (EV_P_ ev_embed *w);
void ev_embed_sweep    (EV_P_ ev_embed *w);
# endif

#endif

#ifdef __cplusplus
}
#endif

#endif

Revision:	1.84
Committed:	Wed Dec 12 05:11:56 2007 UTC (16 years, 5 months ago) by root
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rel-1_81
Changes since 1.83:	+2 -1 lines
Log Message:	remember wether the fd was new or not
#	Content
1	/*
2	* Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>
3	* All rights reserved.
4	*
5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions are
7	* met:
8	*
9	* * Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.
11	*
12	* * Redistributions in binary form must reproduce the above
13	* copyright notice, this list of conditions and the following
14	* disclaimer in the documentation and/or other materials provided
15	* with the distribution.
16	*
17	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
20	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
21	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
22	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
23	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28	*/
29
30	#ifndef EV_H__
31	#define EV_H__
32
33	#ifdef __cplusplus
34	extern "C" {
35	#endif
36
37	typedef double ev_tstamp;
38
39	/* these priorities are inclusive, higher priorities will be called earlier */
40	#ifndef EV_MINPRI
41	# define EV_MINPRI -2
42	#endif
43	#ifndef EV_MAXPRI
44	# define EV_MAXPRI +2
45	#endif
46
47	#ifndef EV_MULTIPLICITY
48	# define EV_MULTIPLICITY 1
49	#endif
50
51	#ifndef EV_PERIODIC_ENABLE
52	# define EV_PERIODIC_ENABLE 1
53	#endif
54
55	#ifndef EV_STAT_ENABLE
56	# define EV_STAT_ENABLE 1
57	#endif
58
59	#ifndef EV_IDLE_ENABLE
60	# define EV_IDLE_ENABLE 1
61	#endif
62
63	#ifndef EV_FORK_ENABLE
64	# define EV_FORK_ENABLE 1
65	#endif
66
67	#ifndef EV_EMBED_ENABLE
68	# define EV_EMBED_ENABLE 1
69	#endif
70
71	/*****************************************************************************/
72
73	#if EV_STAT_ENABLE
74	# include <sys/stat.h>
75	#endif
76
77	/* support multiple event loops? */
78	#if EV_MULTIPLICITY
79	struct ev_loop;
80	# define EV_P struct ev_loop *loop
81	# define EV_P_ EV_P,
82	# define EV_A loop
83	# define EV_A_ EV_A,
84	# define EV_DEFAULT ev_default_loop (0)
85	# define EV_DEFAULT_ EV_DEFAULT,
86	#else
87	# define EV_P void
88	# define EV_P_
89	# define EV_A
90	# define EV_A_
91	# define EV_DEFAULT
92	# define EV_DEFAULT_
93
94	# undef EV_EMBED_ENABLE
95	#endif
96
97	/* eventmask, revents, events... */
98	#define EV_UNDEF -1L /* guaranteed to be invalid */
99	#define EV_NONE 0x00L /* no events */
100	#define EV_READ 0x01L /* ev_io detected read will not block */
101	#define EV_WRITE 0x02L /* ev_io detected write will not block */
102	#define EV_IOFDSET 0x80L /* internal use only */
103	#define EV_TIMEOUT 0x00000100L /* timer timed out */
104	#define EV_PERIODIC 0x00000200L /* periodic timer timed out */
105	#define EV_SIGNAL 0x00000400L /* signal was received */
106	#define EV_CHILD 0x00000800L /* child/pid had status change */
107	#define EV_STAT 0x00001000L /* stat data changed */
108	#define EV_IDLE 0x00002000L /* event loop is idling */
109	#define EV_PREPARE 0x00004000L /* event loop about to poll */
110	#define EV_CHECK 0x00008000L /* event loop finished poll */
111	#define EV_EMBED 0x00010000L /* embedded event loop needs sweep */
112	#define EV_FORK 0x00020000L /* event loop resumed in child */
113	#define EV_ERROR 0x80000000L /* sent when an error occurs */
114
115	/* can be used to add custom fields to all watchers, while losing binary compatibility */
116	#ifndef EV_COMMON
117	# define EV_COMMON void *data;
118	#endif
119	#ifndef EV_PROTOTYPES
120	# define EV_PROTOTYPES 1
121	#endif
122
123	#define EV_VERSION_MAJOR 2
124	#define EV_VERSION_MINOR 0
125
126	#ifndef EV_CB_DECLARE
127	# define EV_CB_DECLARE(type) void (cb)(EV_P_ struct type w, int revents);
128	#endif
129	#ifndef EV_CB_INVOKE
130	# define EV_CB_INVOKE(watcher,revents) (watcher)->cb (EV_A_ (watcher), (revents))
131	#endif
132
133	/*
134	* struct member types:
135	* private: you can look at them, but not change them, and they might not mean anything to you.
136	* ro: can be read anytime, but only changed when the watcher isn't active
137	* rw: can be read and modified anytime, even when the watcher is active
138	*/
139
140	/* shared by all watchers */
141	#define EV_WATCHER(type) \
142	int active; /* private */ \
143	int pending; /* private */ \
144	int priority; /* private */ \
145	EV_COMMON /* rw */ \
146	EV_CB_DECLARE (type) /* private */
147
148	#define EV_WATCHER_LIST(type) \
149	EV_WATCHER (type) \
150	struct ev_watcher_list next; / private */
151
152	#define EV_WATCHER_TIME(type) \
153	EV_WATCHER (type) \
154	ev_tstamp at; /* private */
155
156	/* base class, nothing to see here unless you subclass */
157	typedef struct ev_watcher
158	{
159	EV_WATCHER (ev_watcher)
160	} ev_watcher;
161
162	/* base class, nothing to see here unless you subclass */
163	typedef struct ev_watcher_list
164	{
165	EV_WATCHER_LIST (ev_watcher_list)
166	} ev_watcher_list;
167
168	/* base class, nothing to see here unless you subclass */
169	typedef struct ev_watcher_time
170	{
171	EV_WATCHER_TIME (ev_watcher_time)
172	} ev_watcher_time;
173
174	/* invoked when fd is either EV_READable or EV_WRITEable */
175	/* revent EV_READ, EV_WRITE */
176	typedef struct ev_io
177	{
178	EV_WATCHER_LIST (ev_io)
179
180	int fd; /* ro */
181	int events; /* ro */
182	} ev_io;
183
184	/* invoked after a specific time, repeatable (based on monotonic clock) */
185	/* revent EV_TIMEOUT */
186	typedef struct ev_timer
187	{
188	EV_WATCHER_TIME (ev_timer)
189
190	ev_tstamp repeat; /* rw */
191	} ev_timer;
192
193	/* invoked at some specific time, possibly repeating at regular intervals (based on UTC) */
194	/* revent EV_PERIODIC */
195	typedef struct ev_periodic
196	{
197	EV_WATCHER_TIME (ev_periodic)
198
199	ev_tstamp offset; /* rw */
200	ev_tstamp interval; /* rw */
201	ev_tstamp (reschedule_cb)(struct ev_periodic w, ev_tstamp now); /* rw */
202	} ev_periodic;
203
204	/* invoked when the given signal has been received */
205	/* revent EV_SIGNAL */
206	typedef struct ev_signal
207	{
208	EV_WATCHER_LIST (ev_signal)
209
210	int signum; /* ro */
211	} ev_signal;
212
213	/* invoked when sigchld is received and waitpid indicates the given pid */
214	/* revent EV_CHILD */
215	/* does not support priorities */
216	typedef struct ev_child
217	{
218	EV_WATCHER_LIST (ev_child)
219
220	int pid; /* ro */
221	int rpid; /* rw, holds the received pid */
222	int rstatus; /* rw, holds the exit status, use the macros from sys/wait.h */
223	} ev_child;
224
225	#if EV_STAT_ENABLE
226	/* st_nlink = 0 means missing file or other error */
227	# ifdef _WIN32
228	typedef struct _stati64 ev_statdata;
229	# else
230	typedef struct stat ev_statdata;
231	# endif
232
233	/* invoked each time the stat data changes for a given path */
234	/* revent EV_STAT */
235	typedef struct ev_stat
236	{
237	EV_WATCHER_LIST (ev_stat)
238
239	ev_timer timer; /* private */
240	ev_tstamp interval; /* ro */
241	const char path; / ro */
242	ev_statdata prev; /* ro */
243	ev_statdata attr; /* ro */
244
245	int wd; /* wd for inotify, fd for kqueue */
246	} ev_stat;
247	#endif
248
249	#if EV_IDLE_ENABLE
250	/* invoked when the nothing else needs to be done, keeps the process from blocking */
251	/* revent EV_IDLE */
252	typedef struct ev_idle
253	{
254	EV_WATCHER (ev_idle)
255	} ev_idle;
256	#endif
257
258	/* invoked for each run of the mainloop, just before the blocking call */
259	/* you can still change events in any way you like */
260	/* revent EV_PREPARE */
261	typedef struct ev_prepare
262	{
263	EV_WATCHER (ev_prepare)
264	} ev_prepare;
265
266	/* invoked for each run of the mainloop, just after the blocking call */
267	/* revent EV_CHECK */
268	typedef struct ev_check
269	{
270	EV_WATCHER (ev_check)
271	} ev_check;
272
273	#if EV_FORK_ENABLE
274	/* the callback gets invoked before check in the child process when a fork was detected */
275	typedef struct ev_fork
276	{
277	EV_WATCHER (ev_fork)
278	} ev_fork;
279	#endif
280
281	#if EV_EMBED_ENABLE
282	/* used to embed an event loop inside another */
283	/* the callback gets invoked when the event loop has handled events, and can be 0 */
284	typedef struct ev_embed
285	{
286	EV_WATCHER (ev_embed)
287
288	ev_io io; /* private */
289	struct ev_loop loop; / ro */
290	} ev_embed;
291	#endif
292
293	/* the presence of this union forces similar struct layout */
294	union ev_any_watcher
295	{
296	struct ev_watcher w;
297	struct ev_watcher_list wl;
298
299	struct ev_io io;
300	struct ev_timer timer;
301	struct ev_periodic periodic;
302	struct ev_signal signal;
303	struct ev_child child;
304	#if EV_STAT_ENABLE
305	struct ev_stat stat;
306	#endif
307	#if EV_IDLE_ENABLE
308	struct ev_idle idle;
309	#endif
310	struct ev_prepare prepare;
311	struct ev_check check;
312	#if EV_FORK_ENABLE
313	struct ev_fork fork;
314	#endif
315	#if EV_EMBED_ENABLE
316	struct ev_embed embed;
317	#endif
318	};
319
320	/* bits for ev_default_loop and ev_loop_new */
321	/* the default */
322	#define EVFLAG_AUTO 0x00000000UL /* not quite a mask */
323	/* flag bits */
324	#define EVFLAG_NOENV 0x01000000UL /* do NOT consult environment */
325	#define EVFLAG_FORKCHECK 0x02000000UL /* check for a fork in each iteration */
326	/* method bits to be ored together */
327	#define EVBACKEND_SELECT 0x00000001UL /* about anywhere */
328	#define EVBACKEND_POLL 0x00000002UL /* !win */
329	#define EVBACKEND_EPOLL 0x00000004UL /* linux */
330	#define EVBACKEND_KQUEUE 0x00000008UL /* bsd */
331	#define EVBACKEND_DEVPOLL 0x00000010UL /* solaris 8 / / NYI */
332	#define EVBACKEND_PORT 0x00000020UL /* solaris 10 */
333
334	#if EV_PROTOTYPES
335	int ev_version_major (void);
336	int ev_version_minor (void);
337
338	unsigned int ev_supported_backends (void);
339	unsigned int ev_recommended_backends (void);
340	unsigned int ev_embeddable_backends (void);
341
342	ev_tstamp ev_time (void);
343
344	/* Sets the allocation function to use, works like realloc.
345	* It is used to allocate and free memory.
346	* If it returns zero when memory needs to be allocated, the library might abort
347	* or take some potentially destructive action.
348	* The default is your system realloc function.
349	*/
350	void ev_set_allocator (void (cb)(void *ptr, long size));
351
352	/* set the callback function to call on a
353	* retryable syscall error
354	* (such as failed select, poll, epoll_wait)
355	*/
356	void ev_set_syserr_cb (void (cb)(const char msg));
357
358	# if EV_MULTIPLICITY
359	/* the default loop is the only one that handles signals and child watchers */
360	/* you can call this as often as you like */
361	static struct ev_loop *
362	ev_default_loop (unsigned int flags)
363	{
364	extern struct ev_loop *ev_default_loop_ptr;
365	extern struct ev_loop *ev_default_loop_init (unsigned int flags);
366
367	if (!ev_default_loop_ptr)
368	ev_default_loop_init (flags);
369
370	return ev_default_loop_ptr;
371	}
372
373	/* create and destroy alternative loops that don't handle signals */
374	struct ev_loop *ev_loop_new (unsigned int flags);
375	void ev_loop_destroy (EV_P);
376	void ev_loop_fork (EV_P);
377
378	ev_tstamp ev_now (EV_P); /* time w.r.t. timers and the eventloop, updated after each poll */
379
380	# else
381
382	int ev_default_loop (unsigned int flags); /* returns true when successful */
383
384	static ev_tstamp
385	ev_now (void)
386	{
387	extern ev_tstamp ev_rt_now;
388
389	return ev_rt_now;
390	}
391	# endif
392
393	void ev_default_destroy (void); /* destroy the default loop */
394	/* this needs to be called after fork, to duplicate the default loop */
395	/* if you create alternative loops you have to call ev_loop_fork on them */
396	/* you can call it in either the parent or the child */
397	/* you can actually call it at any time, anywhere :) */
398	void ev_default_fork (void);
399
400	unsigned int ev_backend (EV_P);
401	unsigned int ev_loop_count (EV_P);
402	#endif
403
404	#define EVLOOP_NONBLOCK 1 /* do not block/wait */
405	#define EVLOOP_ONESHOT 2 /* block once only */
406	#define EVUNLOOP_CANCEL 0 /* undo unloop */
407	#define EVUNLOOP_ONE 1 /* unloop once */
408	#define EVUNLOOP_ALL 2 /* unloop all loops */
409
410	#if EV_PROTOTYPES
411	void ev_loop (EV_P_ int flags);
412	void ev_unloop (EV_P_ int how); /* set to 1 to break out of event loop, set to 2 to break out of all event loops */
413
414	/*
415	* ref/unref can be used to add or remove a refcount on the mainloop. every watcher
416	* keeps one reference. if you have a long-runing watcher you never unregister that
417	* should not keep ev_loop from running, unref() after starting, and ref() before stopping.
418	*/
419	void ev_ref (EV_P);
420	void ev_unref (EV_P);
421
422	/* convinience function, wait for a single event, without registering an event watcher */
423	/* if timeout is < 0, do wait indefinitely */
424	void ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (cb)(int revents, void arg), void *arg);
425	#endif
426
427	/* these may evaluate ev multiple times, and the other arguments at most once */
428	/* either use ev_init + ev_TYPE_set, or the ev_TYPE_init macro, below, to first initialise a watcher */
429	#define ev_init(ev,cb_) do { \
430	((ev_watcher )(void )(ev))->active = \
431	((ev_watcher )(void )(ev))->pending = \
432	((ev_watcher )(void )(ev))->priority = 0; \
433	ev_set_cb ((ev), cb_); \
434	} while (0)
435
436	#define ev_io_set(ev,fd_,events_) do { (ev)->fd = (fd_); (ev)->events = (events_) \| EV_IOFDSET; } while (0)
437	#define ev_timer_set(ev,after_,repeat_) do { (ev)->at = (after_); (ev)->repeat = (repeat_); } while (0)
438	#define ev_periodic_set(ev,ofs_,ival_,res_) do { (ev)->offset = (ofs_); (ev)->interval = (ival_); (ev)->reschedule_cb= (res_); } while (0)
439	#define ev_signal_set(ev,signum_) do { (ev)->signum = (signum_); } while (0)
440	#define ev_child_set(ev,pid_) do { (ev)->pid = (pid_); } while (0)
441	#define ev_stat_set(ev,path_,interval_) do { (ev)->path = (path_); (ev)->interval = (interval_); (ev)->wd = -2; } while (0)
442	#define ev_idle_set(ev) /* nop, yes, this is a serious in-joke */
443	#define ev_prepare_set(ev) /* nop, yes, this is a serious in-joke */
444	#define ev_check_set(ev) /* nop, yes, this is a serious in-joke */
445	#define ev_embed_set(ev,loop_) do { (ev)->loop = (loop_); } while (0)
446	#define ev_fork_set(ev) /* nop, yes, this is a serious in-joke */
447
448	#define ev_io_init(ev,cb,fd,events) do { ev_init ((ev), (cb)); ev_io_set ((ev),(fd),(events)); } while (0)
449	#define ev_timer_init(ev,cb,after,repeat) do { ev_init ((ev), (cb)); ev_timer_set ((ev),(after),(repeat)); } while (0)
450	#define ev_periodic_init(ev,cb,at,ival,res) do { ev_init ((ev), (cb)); ev_periodic_set ((ev),(at),(ival),(res)); } while (0)
451	#define ev_signal_init(ev,cb,signum) do { ev_init ((ev), (cb)); ev_signal_set ((ev), (signum)); } while (0)
452	#define ev_child_init(ev,cb,pid) do { ev_init ((ev), (cb)); ev_child_set ((ev),(pid)); } while (0)
453	#define ev_stat_init(ev,cb,path,interval) do { ev_init ((ev), (cb)); ev_path_set ((ev),(path),(interval)); } while (0)
454	#define ev_idle_init(ev,cb) do { ev_init ((ev), (cb)); ev_idle_set ((ev)); } while (0)
455	#define ev_prepare_init(ev,cb) do { ev_init ((ev), (cb)); ev_prepare_set ((ev)); } while (0)
456	#define ev_check_init(ev,cb) do { ev_init ((ev), (cb)); ev_check_set ((ev)); } while (0)
457	#define ev_embed_init(ev,cb,loop) do { ev_init ((ev), (cb)); ev_embed_set ((ev),(loop)); } while (0)
458	#define ev_fork_init(ev,cb) do { ev_init ((ev), (cb)); ev_fork_set ((ev)); } while (0)
459
460	#define ev_is_pending(ev) (0 + ((ev_watcher )(void )(ev))->pending) /* ro, true when watcher is waiting for callback invocation */
461	#define ev_is_active(ev) (0 + ((ev_watcher )(void )(ev))->active) /* ro, true when the watcher has been started */
462
463	#define ev_priority(ev) ((((ev_watcher )(void )(ev))->priority) + 0)
464	#define ev_cb(ev) (ev)->cb /* rw */
465	#define ev_set_priority(ev,pri) ((ev_watcher )(void )(ev))->priority = (pri)
466
467	#ifndef ev_set_cb
468	# define ev_set_cb(ev,cb_) ev_cb (ev) = (cb_)
469	#endif
470
471	/* stopping (enabling, adding) a watcher does nothing if it is already running */
472	/* stopping (disabling, deleting) a watcher does nothing unless its already running */
473	#if EV_PROTOTYPES
474
475	/* feeds an event into a watcher as if the event actually occured */
476	/* accepts any ev_watcher type */
477	void ev_feed_event (EV_P_ void *w, int revents);
478	void ev_feed_fd_event (EV_P_ int fd, int revents);
479	void ev_feed_signal_event (EV_P_ int signum);
480	void ev_invoke (EV_P_ void *w, int revents);
481	int ev_clear_pending (EV_P_ void *w);
482
483	void ev_io_start (EV_P_ ev_io *w);
484	void ev_io_stop (EV_P_ ev_io *w);
485
486	void ev_timer_start (EV_P_ ev_timer *w);
487	void ev_timer_stop (EV_P_ ev_timer *w);
488	/* stops if active and no repeat, restarts if active and repeating, starts if inactive and repeating */
489	void ev_timer_again (EV_P_ ev_timer *w);
490
491	#if EV_PERIODIC_ENABLE
492	void ev_periodic_start (EV_P_ ev_periodic *w);
493	void ev_periodic_stop (EV_P_ ev_periodic *w);
494	void ev_periodic_again (EV_P_ ev_periodic *w);
495	#endif
496
497	/* only supported in the default loop */
498	void ev_signal_start (EV_P_ ev_signal *w);
499	void ev_signal_stop (EV_P_ ev_signal *w);
500
501	/* only supported in the default loop */
502	void ev_child_start (EV_P_ ev_child *w);
503	void ev_child_stop (EV_P_ ev_child *w);
504
505	# if EV_STAT_ENABLE
506	void ev_stat_start (EV_P_ ev_stat *w);
507	void ev_stat_stop (EV_P_ ev_stat *w);
508	void ev_stat_stat (EV_P_ ev_stat *w);
509	# endif
510
511	# if EV_IDLE_ENABLE
512	void ev_idle_start (EV_P_ ev_idle *w);
513	void ev_idle_stop (EV_P_ ev_idle *w);
514	# endif
515
516	void ev_prepare_start (EV_P_ ev_prepare *w);
517	void ev_prepare_stop (EV_P_ ev_prepare *w);
518
519	void ev_check_start (EV_P_ ev_check *w);
520	void ev_check_stop (EV_P_ ev_check *w);
521
522	# if EV_FORK_ENABLE
523	void ev_fork_start (EV_P_ ev_fork *w);
524	void ev_fork_stop (EV_P_ ev_fork *w);
525	# endif
526
527	# if EV_EMBED_ENABLE
528	/* only supported when loop to be embedded is in fact embeddable */
529	void ev_embed_start (EV_P_ ev_embed *w);
530	void ev_embed_stop (EV_P_ ev_embed *w);
531	void ev_embed_sweep (EV_P_ ev_embed *w);
532	# endif
533
534	#endif
535
536	#ifdef __cplusplus
537	}
538	#endif
539
540	#endif
541