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_FORK_ENABLE
# define EV_FORK_ENABLE 1
#endif

#ifndef EV_EMBED_ENABLE
# define EV_EMBED_ENABLE 1
#endif

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

#include <stddef.h> /* for size_t */

#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_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 1
#define EV_VERSION_MINOR 1

#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 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 (ev_stat)

  ev_timer timer;     /* private */
  ev_tstamp interval; /* ro */
  const char *path;   /* ro */
  ev_statdata prev;   /* ro */
  ev_statdata attr;   /* ro */
} ev_stat;
#endif

/* 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;

/* 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
  struct ev_idle idle;
  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 */
/* 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, size_t 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);
#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_); } while (0)
#define ev_timer_set(ev,after_,repeat_)     do { (ev)->at = (after_); (ev)->repeat = (repeat_); } while (0)
#define ev_periodic_set(ev,at_,ival_,res_)  do { (ev)->at = (at_); (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_); } 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 /* rw */
#define ev_cb(ev)                           (ev)->cb /* rw */
#define ev_set_priority(ev,pri)             ev_priority (ev) = (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_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

void ev_idle_start     (EV_P_ ev_idle *w);
void ev_idle_stop      (EV_P_ ev_idle *w);

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:	1.73
Committed:	Tue Nov 27 19:41:52 2007 UTC (16 years, 5 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.72:	+3 -1 lines
Log Message:	I ❤ µ-opts
#	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_FORK_ENABLE
60	# define EV_FORK_ENABLE 1
61	#endif
62
63	#ifndef EV_EMBED_ENABLE
64	# define EV_EMBED_ENABLE 1
65	#endif
66
67	/*****************************************************************************/
68
69	#include <stddef.h> /* for size_t */
70
71	#if EV_STAT_ENABLE
72	# include <sys/stat.h>
73	#endif
74
75	/* support multiple event loops? */
76	#if EV_MULTIPLICITY
77	struct ev_loop;
78	# define EV_P struct ev_loop *loop
79	# define EV_P_ EV_P,
80	# define EV_A loop
81	# define EV_A_ EV_A,
82	# define EV_DEFAULT ev_default_loop (0)
83	# define EV_DEFAULT_ EV_DEFAULT,
84	#else
85	# define EV_P void
86	# define EV_P_
87	# define EV_A
88	# define EV_A_
89	# define EV_DEFAULT
90	# define EV_DEFAULT_
91
92	# undef EV_EMBED_ENABLE
93	#endif
94
95	/* eventmask, revents, events... */
96	#define EV_UNDEF -1L /* guaranteed to be invalid */
97	#define EV_NONE 0x00L /* no events */
98	#define EV_READ 0x01L /* ev_io detected read will not block */
99	#define EV_WRITE 0x02L /* ev_io detected write will not block */
100	#define EV_TIMEOUT 0x00000100L /* timer timed out */
101	#define EV_PERIODIC 0x00000200L /* periodic timer timed out */
102	#define EV_SIGNAL 0x00000400L /* signal was received */
103	#define EV_CHILD 0x00000800L /* child/pid had status change */
104	#define EV_STAT 0x00001000L /* stat data changed */
105	#define EV_IDLE 0x00002000L /* event loop is idling */
106	#define EV_PREPARE 0x00004000L /* event loop about to poll */
107	#define EV_CHECK 0x00008000L /* event loop finished poll */
108	#define EV_EMBED 0x00010000L /* embedded event loop needs sweep */
109	#define EV_FORK 0x00020000L /* event loop resumed in child */
110	#define EV_ERROR 0x80000000L /* sent when an error occurs */
111
112	/* can be used to add custom fields to all watchers, while losing binary compatibility */
113	#ifndef EV_COMMON
114	# define EV_COMMON void *data;
115	#endif
116	#ifndef EV_PROTOTYPES
117	# define EV_PROTOTYPES 1
118	#endif
119
120	#define EV_VERSION_MAJOR 1
121	#define EV_VERSION_MINOR 1
122
123	#ifndef EV_CB_DECLARE
124	# define EV_CB_DECLARE(type) void (cb)(EV_P_ struct type w, int revents);
125	#endif
126	#ifndef EV_CB_INVOKE
127	# define EV_CB_INVOKE(watcher,revents) (watcher)->cb (EV_A_ (watcher), (revents))
128	#endif
129
130	/*
131	* struct member types:
132	* private: you can look at them, but not change them, and they might not mean anything to you.
133	* ro: can be read anytime, but only changed when the watcher isn't active
134	* rw: can be read and modified anytime, even when the watcher is active
135	*/
136
137	/* shared by all watchers */
138	#define EV_WATCHER(type) \
139	int active; /* private */ \
140	int pending; /* private */ \
141	int priority; /* private */ \
142	EV_COMMON /* rw */ \
143	EV_CB_DECLARE (type) /* private */
144
145	#define EV_WATCHER_LIST(type) \
146	EV_WATCHER (type) \
147	struct ev_watcher_list next; / private */
148
149	#define EV_WATCHER_TIME(type) \
150	EV_WATCHER (type) \
151	ev_tstamp at; /* private */
152
153	/* base class, nothing to see here unless you subclass */
154	typedef struct ev_watcher
155	{
156	EV_WATCHER (ev_watcher)
157	} ev_watcher;
158
159	/* base class, nothing to see here unless you subclass */
160	typedef struct ev_watcher_list
161	{
162	EV_WATCHER_LIST (ev_watcher_list)
163	} ev_watcher_list;
164
165	/* base class, nothing to see here unless you subclass */
166	typedef struct ev_watcher_time
167	{
168	EV_WATCHER_TIME (ev_watcher_time)
169	} ev_watcher_time;
170
171	/* invoked when fd is either EV_READable or EV_WRITEable */
172	/* revent EV_READ, EV_WRITE */
173	typedef struct ev_io
174	{
175	EV_WATCHER_LIST (ev_io)
176
177	int fd; /* ro */
178	int events; /* ro */
179	} ev_io;
180
181	/* invoked after a specific time, repeatable (based on monotonic clock) */
182	/* revent EV_TIMEOUT */
183	typedef struct ev_timer
184	{
185	EV_WATCHER_TIME (ev_timer)
186
187	ev_tstamp repeat; /* rw */
188	} ev_timer;
189
190	/* invoked at some specific time, possibly repeating at regular intervals (based on UTC) */
191	/* revent EV_PERIODIC */
192	typedef struct ev_periodic
193	{
194	EV_WATCHER_TIME (ev_periodic)
195
196	ev_tstamp interval; /* rw */
197	ev_tstamp (reschedule_cb)(struct ev_periodic w, ev_tstamp now); /* rw */
198	} ev_periodic;
199
200	/* invoked when the given signal has been received */
201	/* revent EV_SIGNAL */
202	typedef struct ev_signal
203	{
204	EV_WATCHER_LIST (ev_signal)
205
206	int signum; /* ro */
207	} ev_signal;
208
209	/* invoked when sigchld is received and waitpid indicates the given pid */
210	/* revent EV_CHILD */
211	/* does not support priorities */
212	typedef struct ev_child
213	{
214	EV_WATCHER_LIST (ev_child)
215
216	int pid; /* ro */
217	int rpid; /* rw, holds the received pid */
218	int rstatus; /* rw, holds the exit status, use the macros from sys/wait.h */
219	} ev_child;
220
221	#if EV_STAT_ENABLE
222	/* st_nlink = 0 means missing file or other error */
223	#ifdef _WIN32
224	typedef struct _stati64 ev_statdata;
225	#else
226	typedef struct stat ev_statdata;
227	#endif
228
229	/* invoked each time the stat data changes for a given path */
230	/* revent EV_STAT */
231	typedef struct ev_stat
232	{
233	EV_WATCHER (ev_stat)
234
235	ev_timer timer; /* private */
236	ev_tstamp interval; /* ro */
237	const char path; / ro */
238	ev_statdata prev; /* ro */
239	ev_statdata attr; /* ro */
240	} ev_stat;
241	#endif
242
243	/* invoked when the nothing else needs to be done, keeps the process from blocking */
244	/* revent EV_IDLE */
245	typedef struct ev_idle
246	{
247	EV_WATCHER (ev_idle)
248	} ev_idle;
249
250	/* invoked for each run of the mainloop, just before the blocking call */
251	/* you can still change events in any way you like */
252	/* revent EV_PREPARE */
253	typedef struct ev_prepare
254	{
255	EV_WATCHER (ev_prepare)
256	} ev_prepare;
257
258	/* invoked for each run of the mainloop, just after the blocking call */
259	/* revent EV_CHECK */
260	typedef struct ev_check
261	{
262	EV_WATCHER (ev_check)
263	} ev_check;
264
265	#if EV_FORK_ENABLE
266	/* the callback gets invoked before check in the child process when a fork was detected */
267	typedef struct ev_fork
268	{
269	EV_WATCHER (ev_fork)
270	} ev_fork;
271	#endif
272
273	#if EV_EMBED_ENABLE
274	/* used to embed an event loop inside another */
275	/* the callback gets invoked when the event loop has handled events, and can be 0 */
276	typedef struct ev_embed
277	{
278	EV_WATCHER (ev_embed)
279
280	ev_io io; /* private */
281	struct ev_loop loop; / ro */
282	} ev_embed;
283	#endif
284
285	/* the presence of this union forces similar struct layout */
286	union ev_any_watcher
287	{
288	struct ev_watcher w;
289	struct ev_watcher_list wl;
290
291	struct ev_io io;
292	struct ev_timer timer;
293	struct ev_periodic periodic;
294	struct ev_signal signal;
295	struct ev_child child;
296	#if EV_STAT_ENABLE
297	struct ev_stat stat;
298	#endif
299	struct ev_idle idle;
300	struct ev_prepare prepare;
301	struct ev_check check;
302	#if EV_FORK_ENABLE
303	struct ev_fork fork;
304	#endif
305	#if EV_EMBED_ENABLE
306	struct ev_embed embed;
307	#endif
308	};
309
310	/* bits for ev_default_loop and ev_loop_new */
311	/* the default */
312	#define EVFLAG_AUTO 0x00000000UL /* not quite a mask */
313	/* flag bits */
314	#define EVFLAG_NOENV 0x01000000UL /* do NOT consult environment */
315	/* method bits to be ored together */
316	#define EVBACKEND_SELECT 0x00000001UL /* about anywhere */
317	#define EVBACKEND_POLL 0x00000002UL /* !win */
318	#define EVBACKEND_EPOLL 0x00000004UL /* linux */
319	#define EVBACKEND_KQUEUE 0x00000008UL /* bsd */
320	#define EVBACKEND_DEVPOLL 0x00000010UL /* solaris 8 / / NYI */
321	#define EVBACKEND_PORT 0x00000020UL /* solaris 10 */
322
323	#if EV_PROTOTYPES
324	int ev_version_major (void);
325	int ev_version_minor (void);
326
327	unsigned int ev_supported_backends (void);
328	unsigned int ev_recommended_backends (void);
329	unsigned int ev_embeddable_backends (void);
330
331	ev_tstamp ev_time (void);
332
333	/* Sets the allocation function to use, works like realloc.
334	* It is used to allocate and free memory.
335	* If it returns zero when memory needs to be allocated, the library might abort
336	* or take some potentially destructive action.
337	* The default is your system realloc function.
338	*/
339	void ev_set_allocator (void (cb)(void *ptr, size_t size));
340
341	/* set the callback function to call on a
342	* retryable syscall error
343	* (such as failed select, poll, epoll_wait)
344	*/
345	void ev_set_syserr_cb (void (cb)(const char msg));
346
347	# if EV_MULTIPLICITY
348	/* the default loop is the only one that handles signals and child watchers */
349	/* you can call this as often as you like */
350	static struct ev_loop *
351	ev_default_loop (unsigned int flags)
352	{
353	extern struct ev_loop *ev_default_loop_ptr;
354	extern struct ev_loop *ev_default_loop_init (unsigned int flags);
355
356	if (!ev_default_loop_ptr)
357	ev_default_loop_init (flags);
358
359	return ev_default_loop_ptr;
360	}
361
362	/* create and destroy alternative loops that don't handle signals */
363	struct ev_loop *ev_loop_new (unsigned int flags);
364	void ev_loop_destroy (EV_P);
365	void ev_loop_fork (EV_P);
366
367	ev_tstamp ev_now (EV_P); /* time w.r.t. timers and the eventloop, updated after each poll */
368
369	# else
370
371	int ev_default_loop (unsigned int flags); /* returns true when successful */
372
373	static ev_tstamp
374	ev_now (void)
375	{
376	extern ev_tstamp ev_rt_now;
377
378	return ev_rt_now;
379	}
380	# endif
381
382	void ev_default_destroy (void); /* destroy the default loop */
383	/* this needs to be called after fork, to duplicate the default loop */
384	/* if you create alternative loops you have to call ev_loop_fork on them */
385	/* you can call it in either the parent or the child */
386	/* you can actually call it at any time, anywhere :) */
387	void ev_default_fork (void);
388
389	unsigned int ev_backend (EV_P);
390	#endif
391
392	#define EVLOOP_NONBLOCK 1 /* do not block/wait */
393	#define EVLOOP_ONESHOT 2 /* block once only */
394	#define EVUNLOOP_CANCEL 0 /* undo unloop */
395	#define EVUNLOOP_ONE 1 /* unloop once */
396	#define EVUNLOOP_ALL 2 /* unloop all loops */
397
398	#if EV_PROTOTYPES
399	void ev_loop (EV_P_ int flags);
400	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 */
401
402	/*
403	* ref/unref can be used to add or remove a refcount on the mainloop. every watcher
404	* keeps one reference. if you have a long-runing watcher you never unregister that
405	* should not keep ev_loop from running, unref() after starting, and ref() before stopping.
406	*/
407	void ev_ref (EV_P);
408	void ev_unref (EV_P);
409
410	/* convinience function, wait for a single event, without registering an event watcher */
411	/* if timeout is < 0, do wait indefinitely */
412	void ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (cb)(int revents, void arg), void *arg);
413	#endif
414
415	/* these may evaluate ev multiple times, and the other arguments at most once */
416	/* either use ev_init + ev_TYPE_set, or the ev_TYPE_init macro, below, to first initialise a watcher */
417	#define ev_init(ev,cb_) do { \
418	((ev_watcher )(void )(ev))->active = \
419	((ev_watcher )(void )(ev))->pending = \
420	((ev_watcher )(void )(ev))->priority = 0; \
421	ev_set_cb ((ev), cb_); \
422	} while (0)
423
424	#define ev_io_set(ev,fd_,events_) do { (ev)->fd = (fd_); (ev)->events = (events_); } while (0)
425	#define ev_timer_set(ev,after_,repeat_) do { (ev)->at = (after_); (ev)->repeat = (repeat_); } while (0)
426	#define ev_periodic_set(ev,at_,ival_,res_) do { (ev)->at = (at_); (ev)->interval = (ival_); (ev)->reschedule_cb= (res_); } while (0)
427	#define ev_signal_set(ev,signum_) do { (ev)->signum = (signum_); } while (0)
428	#define ev_child_set(ev,pid_) do { (ev)->pid = (pid_); } while (0)
429	#define ev_stat_set(ev,path_,interval_) do { (ev)->path = (path_); (ev)->interval = (interval_); } while (0)
430	#define ev_idle_set(ev) /* nop, yes, this is a serious in-joke */
431	#define ev_prepare_set(ev) /* nop, yes, this is a serious in-joke */
432	#define ev_check_set(ev) /* nop, yes, this is a serious in-joke */
433	#define ev_embed_set(ev,loop_) do { (ev)->loop = (loop_); } while (0)
434	#define ev_fork_set(ev) /* nop, yes, this is a serious in-joke */
435
436	#define ev_io_init(ev,cb,fd,events) do { ev_init ((ev), (cb)); ev_io_set ((ev),(fd),(events)); } while (0)
437	#define ev_timer_init(ev,cb,after,repeat) do { ev_init ((ev), (cb)); ev_timer_set ((ev),(after),(repeat)); } while (0)
438	#define ev_periodic_init(ev,cb,at,ival,res) do { ev_init ((ev), (cb)); ev_periodic_set ((ev),(at),(ival),(res)); } while (0)
439	#define ev_signal_init(ev,cb,signum) do { ev_init ((ev), (cb)); ev_signal_set ((ev), (signum)); } while (0)
440	#define ev_child_init(ev,cb,pid) do { ev_init ((ev), (cb)); ev_child_set ((ev),(pid)); } while (0)
441	#define ev_stat_init(ev,cb,path,interval) do { ev_init ((ev), (cb)); ev_path_set ((ev),(path),(interval)); } while (0)
442	#define ev_idle_init(ev,cb) do { ev_init ((ev), (cb)); ev_idle_set ((ev)); } while (0)
443	#define ev_prepare_init(ev,cb) do { ev_init ((ev), (cb)); ev_prepare_set ((ev)); } while (0)
444	#define ev_check_init(ev,cb) do { ev_init ((ev), (cb)); ev_check_set ((ev)); } while (0)
445	#define ev_embed_init(ev,cb,loop) do { ev_init ((ev), (cb)); ev_embed_set ((ev),(loop)); } while (0)
446	#define ev_fork_init(ev,cb) do { ev_init ((ev), (cb)); ev_fork_set ((ev)); } while (0)
447
448	#define ev_is_pending(ev) (0 + ((ev_watcher )(void )(ev))->pending) /* ro, true when watcher is waiting for callback invocation */
449	#define ev_is_active(ev) (0 + ((ev_watcher )(void )(ev))->active) /* ro, true when the watcher has been started */
450
451	#define ev_priority(ev) ((ev_watcher )(void )(ev))->priority /* rw */
452	#define ev_cb(ev) (ev)->cb /* rw */
453	#define ev_set_priority(ev,pri) ev_priority (ev) = (pri)
454
455	#ifndef ev_set_cb
456	# define ev_set_cb(ev,cb_) ev_cb (ev) = (cb_)
457	#endif
458
459	/* stopping (enabling, adding) a watcher does nothing if it is already running */
460	/* stopping (disabling, deleting) a watcher does nothing unless its already running */
461	#if EV_PROTOTYPES
462
463	/* feeds an event into a watcher as if the event actually occured */
464	/* accepts any ev_watcher type */
465	void ev_feed_event (EV_P_ void *w, int revents);
466	void ev_feed_fd_event (EV_P_ int fd, int revents);
467	void ev_feed_signal_event (EV_P_ int signum);
468
469	void ev_io_start (EV_P_ ev_io *w);
470	void ev_io_stop (EV_P_ ev_io *w);
471
472	void ev_timer_start (EV_P_ ev_timer *w);
473	void ev_timer_stop (EV_P_ ev_timer *w);
474	/* stops if active and no repeat, restarts if active and repeating, starts if inactive and repeating */
475	void ev_timer_again (EV_P_ ev_timer *w);
476
477	#if EV_PERIODIC_ENABLE
478	void ev_periodic_start (EV_P_ ev_periodic *w);
479	void ev_periodic_stop (EV_P_ ev_periodic *w);
480	void ev_periodic_again (EV_P_ ev_periodic *w);
481	#endif
482
483	/* only supported in the default loop */
484	void ev_signal_start (EV_P_ ev_signal *w);
485	void ev_signal_stop (EV_P_ ev_signal *w);
486
487	/* only supported in the default loop */
488	void ev_child_start (EV_P_ ev_child *w);
489	void ev_child_stop (EV_P_ ev_child *w);
490
491	# if EV_STAT_ENABLE
492	void ev_stat_start (EV_P_ ev_stat *w);
493	void ev_stat_stop (EV_P_ ev_stat *w);
494	void ev_stat_stat (EV_P_ ev_stat *w);
495	# endif
496
497	void ev_idle_start (EV_P_ ev_idle *w);
498	void ev_idle_stop (EV_P_ ev_idle *w);
499
500	void ev_prepare_start (EV_P_ ev_prepare *w);
501	void ev_prepare_stop (EV_P_ ev_prepare *w);
502
503	void ev_check_start (EV_P_ ev_check *w);
504	void ev_check_stop (EV_P_ ev_check *w);
505
506	# if EV_FORK_ENABLE
507	void ev_fork_start (EV_P_ ev_fork *w);
508	void ev_fork_stop (EV_P_ ev_fork *w);
509	# endif
510
511	# if EV_EMBED_ENABLE
512	/* only supported when loop to be embedded is in fact embeddable */
513	void ev_embed_start (EV_P_ ev_embed *w);
514	void ev_embed_stop (EV_P_ ev_embed *w);
515	void ev_embed_sweep (EV_P_ ev_embed *w);
516	# endif
517
518	#endif
519
520	#ifdef __cplusplus
521	}
522	#endif
523
524	#endif
525