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

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

#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_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

/* 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 */
#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);
#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_); (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 /* 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:	1.76
Committed:	Thu Nov 29 17:28:13 2007 UTC (16 years, 5 months ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.75:	+1 -0 lines
Log Message:	implement EVFLAG_FORKCHECK
#	User	Rev	Content
1	root	1.10	/*
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	root	1.43	#ifndef EV_H__
31			#define EV_H__
32	root	1.1
33	root	1.19	#ifdef __cplusplus
34			extern "C" {
35			#endif
36
37	root	1.1	typedef double ev_tstamp;
38
39	root	1.21	/* 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	root	1.29	#ifndef EV_MULTIPLICITY
48			# define EV_MULTIPLICITY 1
49			#endif
50
51	root	1.69	#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	root	1.72	#ifndef EV_FORK_ENABLE
60			# define EV_FORK_ENABLE 1
61			#endif
62
63	root	1.69	#ifndef EV_EMBED_ENABLE
64			# define EV_EMBED_ENABLE 1
65			#endif
66
67			/*****************************************************************************/
68
69			#if EV_STAT_ENABLE
70			# include <sys/stat.h>
71	root	1.50	#endif
72
73	root	1.28	/* support multiple event loops? */
74	root	1.29	#if EV_MULTIPLICITY
75	root	1.28	struct ev_loop;
76			# define EV_P struct ev_loop *loop
77			# define EV_P_ EV_P,
78			# define EV_A loop
79			# define EV_A_ EV_A,
80	root	1.72	# define EV_DEFAULT ev_default_loop (0)
81			# define EV_DEFAULT_ EV_DEFAULT,
82	root	1.28	#else
83			# define EV_P void
84			# define EV_P_
85			# define EV_A
86			# define EV_A_
87	root	1.72	# define EV_DEFAULT
88			# define EV_DEFAULT_
89	root	1.69
90			# undef EV_EMBED_ENABLE
91	root	1.28	#endif
92	root	1.27
93	root	1.1	/* eventmask, revents, events... */
94	root	1.69	#define EV_UNDEF -1L /* guaranteed to be invalid */
95			#define EV_NONE 0x00L /* no events */
96			#define EV_READ 0x01L /* ev_io detected read will not block */
97			#define EV_WRITE 0x02L /* ev_io detected write will not block */
98			#define EV_TIMEOUT 0x00000100L /* timer timed out */
99			#define EV_PERIODIC 0x00000200L /* periodic timer timed out */
100			#define EV_SIGNAL 0x00000400L /* signal was received */
101	root	1.72	#define EV_CHILD 0x00000800L /* child/pid had status change */
102			#define EV_STAT 0x00001000L /* stat data changed */
103			#define EV_IDLE 0x00002000L /* event loop is idling */
104			#define EV_PREPARE 0x00004000L /* event loop about to poll */
105			#define EV_CHECK 0x00008000L /* event loop finished poll */
106			#define EV_EMBED 0x00010000L /* embedded event loop needs sweep */
107			#define EV_FORK 0x00020000L /* event loop resumed in child */
108	root	1.69	#define EV_ERROR 0x80000000L /* sent when an error occurs */
109	root	1.1
110	root	1.51	/* can be used to add custom fields to all watchers, while losing binary compatibility */
111	root	1.6	#ifndef EV_COMMON
112	root	1.52	# define EV_COMMON void *data;
113	root	1.6	#endif
114	root	1.9	#ifndef EV_PROTOTYPES
115			# define EV_PROTOTYPES 1
116			#endif
117	root	1.6
118	root	1.14	#define EV_VERSION_MAJOR 1
119			#define EV_VERSION_MINOR 1
120
121	root	1.44	#ifndef EV_CB_DECLARE
122	root	1.46	# define EV_CB_DECLARE(type) void (cb)(EV_P_ struct type w, int revents);
123	root	1.44	#endif
124			#ifndef EV_CB_INVOKE
125			# define EV_CB_INVOKE(watcher,revents) (watcher)->cb (EV_A_ (watcher), (revents))
126			#endif
127
128	root	1.6	/*
129			* struct member types:
130			* private: you can look at them, but not change them, and they might not mean anything to you.
131			* ro: can be read anytime, but only changed when the watcher isn't active
132			* rw: can be read and modified anytime, even when the watcher is active
133			*/
134
135	root	1.1	/* shared by all watchers */
136			#define EV_WATCHER(type) \
137			int active; /* private */ \
138			int pending; /* private */ \
139	root	1.32	int priority; /* private */ \
140	root	1.52	EV_COMMON /* rw */ \
141	root	1.44	EV_CB_DECLARE (type) /* private */
142	root	1.1
143			#define EV_WATCHER_LIST(type) \
144	root	1.52	EV_WATCHER (type) \
145			struct ev_watcher_list next; / private */
146	root	1.1
147	root	1.6	#define EV_WATCHER_TIME(type) \
148	root	1.52	EV_WATCHER (type) \
149			ev_tstamp at; /* private */
150	root	1.6
151	root	1.7	/* base class, nothing to see here unless you subclass */
152	root	1.66	typedef struct ev_watcher
153	root	1.44	{
154	root	1.52	EV_WATCHER (ev_watcher)
155	root	1.66	} ev_watcher;
156	root	1.7
157			/* base class, nothing to see here unless you subclass */
158	root	1.66	typedef struct ev_watcher_list
159	root	1.44	{
160	root	1.52	EV_WATCHER_LIST (ev_watcher_list)
161	root	1.66	} ev_watcher_list;
162	root	1.7
163			/* base class, nothing to see here unless you subclass */
164	root	1.66	typedef struct ev_watcher_time
165	root	1.44	{
166	root	1.52	EV_WATCHER_TIME (ev_watcher_time)
167	root	1.66	} ev_watcher_time;
168	root	1.7
169	root	1.70	/* invoked when fd is either EV_READable or EV_WRITEable */
170			/* revent EV_READ, EV_WRITE */
171			typedef struct ev_io
172			{
173			EV_WATCHER_LIST (ev_io)
174
175			int fd; /* ro */
176			int events; /* ro */
177			} ev_io;
178
179	root	1.6	/* invoked after a specific time, repeatable (based on monotonic clock) */
180	root	1.17	/* revent EV_TIMEOUT */
181	root	1.66	typedef struct ev_timer
182	root	1.1	{
183	root	1.52	EV_WATCHER_TIME (ev_timer)
184	root	1.1
185			ev_tstamp repeat; /* rw */
186	root	1.66	} ev_timer;
187	root	1.6
188			/* invoked at some specific time, possibly repeating at regular intervals (based on UTC) */
189	root	1.17	/* revent EV_PERIODIC */
190	root	1.66	typedef struct ev_periodic
191	root	1.6	{
192	root	1.52	EV_WATCHER_TIME (ev_periodic)
193	root	1.6
194			ev_tstamp interval; /* rw */
195	root	1.40	ev_tstamp (reschedule_cb)(struct ev_periodic w, ev_tstamp now); /* rw */
196	root	1.66	} ev_periodic;
197	root	1.1
198	root	1.5	/* invoked when the given signal has been received */
199	root	1.17	/* revent EV_SIGNAL */
200	root	1.66	typedef struct ev_signal
201	root	1.1	{
202	root	1.52	EV_WATCHER_LIST (ev_signal)
203	root	1.1
204			int signum; /* ro */
205	root	1.66	} ev_signal;
206	root	1.1
207	root	1.70	/* invoked when sigchld is received and waitpid indicates the given pid */
208			/* revent EV_CHILD */
209			/* does not support priorities */
210			typedef struct ev_child
211			{
212			EV_WATCHER_LIST (ev_child)
213
214			int pid; /* ro */
215			int rpid; /* rw, holds the received pid */
216			int rstatus; /* rw, holds the exit status, use the macros from sys/wait.h */
217			} ev_child;
218
219			#if EV_STAT_ENABLE
220			/* st_nlink = 0 means missing file or other error */
221	root	1.74	# ifdef _WIN32
222	root	1.71	typedef struct _stati64 ev_statdata;
223	root	1.74	# else
224	root	1.70	typedef struct stat ev_statdata;
225	root	1.74	# endif
226	root	1.70
227			/* invoked each time the stat data changes for a given path */
228			/* revent EV_STAT */
229			typedef struct ev_stat
230			{
231	root	1.74	EV_WATCHER_LIST (ev_stat)
232	root	1.70
233			ev_timer timer; /* private */
234			ev_tstamp interval; /* ro */
235			const char path; / ro */
236			ev_statdata prev; /* ro */
237			ev_statdata attr; /* ro */
238	root	1.74
239			int wd; /* wd for inotify, fd for kqueue */
240	root	1.70	} ev_stat;
241			#endif
242
243	root	1.5	/* invoked when the nothing else needs to be done, keeps the process from blocking */
244	root	1.17	/* revent EV_IDLE */
245	root	1.66	typedef struct ev_idle
246	root	1.5	{
247	root	1.52	EV_WATCHER (ev_idle)
248	root	1.66	} ev_idle;
249	root	1.5
250	root	1.11	/* invoked for each run of the mainloop, just before the blocking call */
251			/* you can still change events in any way you like */
252	root	1.17	/* revent EV_PREPARE */
253	root	1.66	typedef struct ev_prepare
254	root	1.11	{
255	root	1.52	EV_WATCHER (ev_prepare)
256	root	1.66	} ev_prepare;
257	root	1.11
258			/* invoked for each run of the mainloop, just after the blocking call */
259	root	1.17	/* revent EV_CHECK */
260	root	1.66	typedef struct ev_check
261	root	1.5	{
262	root	1.52	EV_WATCHER (ev_check)
263	root	1.66	} ev_check;
264	root	1.5
265	root	1.72	#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	root	1.69	#if EV_EMBED_ENABLE
274	root	1.64	/* 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	root	1.66	typedef struct ev_embed
277	root	1.64	{
278			EV_WATCHER (ev_embed)
279
280	root	1.66	ev_io io; /* private */
281	root	1.64	struct ev_loop loop; / ro */
282	root	1.66	} ev_embed;
283	root	1.64	#endif
284
285	root	1.41	/* the presence of this union forces similar struct layout */
286	root	1.35	union ev_any_watcher
287			{
288			struct ev_watcher w;
289			struct ev_watcher_list wl;
290	root	1.46
291	root	1.35	struct ev_io io;
292			struct ev_timer timer;
293			struct ev_periodic periodic;
294	root	1.72	struct ev_signal signal;
295	root	1.70	struct ev_child child;
296			#if EV_STAT_ENABLE
297			struct ev_stat stat;
298			#endif
299	root	1.35	struct ev_idle idle;
300			struct ev_prepare prepare;
301			struct ev_check check;
302	root	1.72	#if EV_FORK_ENABLE
303			struct ev_fork fork;
304			#endif
305	root	1.69	#if EV_EMBED_ENABLE
306	root	1.64	struct ev_embed embed;
307	root	1.67	#endif
308	root	1.35	};
309
310	root	1.53	/* bits for ev_default_loop and ev_loop_new */
311			/* the default */
312	root	1.63	#define EVFLAG_AUTO 0x00000000UL /* not quite a mask */
313			/* flag bits */
314			#define EVFLAG_NOENV 0x01000000UL /* do NOT consult environment */
315	root	1.76	#define EVFLAG_FORKCHECK 0x02000000UL /* check for a fork in each iteration */
316	root	1.53	/* method bits to be ored together */
317	root	1.63	#define EVBACKEND_SELECT 0x00000001UL /* about anywhere */
318			#define EVBACKEND_POLL 0x00000002UL /* !win */
319			#define EVBACKEND_EPOLL 0x00000004UL /* linux */
320			#define EVBACKEND_KQUEUE 0x00000008UL /* bsd */
321			#define EVBACKEND_DEVPOLL 0x00000010UL /* solaris 8 / / NYI */
322			#define EVBACKEND_PORT 0x00000020UL /* solaris 10 */
323	root	1.29
324	root	1.9	#if EV_PROTOTYPES
325	root	1.14	int ev_version_major (void);
326			int ev_version_minor (void);
327	root	1.1
328	root	1.63	unsigned int ev_supported_backends (void);
329			unsigned int ev_recommended_backends (void);
330	root	1.64	unsigned int ev_embeddable_backends (void);
331	root	1.63
332	root	1.1	ev_tstamp ev_time (void);
333	root	1.29
334	root	1.36	/* Sets the allocation function to use, works like realloc.
335			* It is used to allocate and free memory.
336			* If it returns zero when memory needs to be allocated, the library might abort
337			* or take some potentially destructive action.
338			* The default is your system realloc function.
339			*/
340	root	1.75	void ev_set_allocator (void (cb)(void *ptr, long size));
341	root	1.36
342			/* set the callback function to call on a
343			* retryable syscall error
344			* (such as failed select, poll, epoll_wait)
345			*/
346	root	1.37	void ev_set_syserr_cb (void (cb)(const char msg));
347	root	1.36
348	root	1.29	# if EV_MULTIPLICITY
349	root	1.30	/* the default loop is the only one that handles signals and child watchers */
350			/* you can call this as often as you like */
351	root	1.58	static struct ev_loop *
352			ev_default_loop (unsigned int flags)
353			{
354			extern struct ev_loop *ev_default_loop_ptr;
355	root	1.61	extern struct ev_loop *ev_default_loop_init (unsigned int flags);
356	root	1.58
357			if (!ev_default_loop_ptr)
358	root	1.60	ev_default_loop_init (flags);
359	root	1.58
360			return ev_default_loop_ptr;
361			}
362	root	1.30
363			/* create and destroy alternative loops that don't handle signals */
364	root	1.53	struct ev_loop *ev_loop_new (unsigned int flags);
365	root	1.30	void ev_loop_destroy (EV_P);
366			void ev_loop_fork (EV_P);
367	root	1.47
368			ev_tstamp ev_now (EV_P); /* time w.r.t. timers and the eventloop, updated after each poll */
369
370	root	1.29	# else
371	root	1.47
372	root	1.54	int ev_default_loop (unsigned int flags); /* returns true when successful */
373	root	1.47
374			static ev_tstamp
375	root	1.52	ev_now (void)
376	root	1.47	{
377	root	1.48	extern ev_tstamp ev_rt_now;
378	root	1.47
379			return ev_rt_now;
380			}
381	root	1.29	# endif
382
383	root	1.30	void ev_default_destroy (void); /* destroy the default loop */
384			/* this needs to be called after fork, to duplicate the default loop */
385			/* if you create alternative loops you have to call ev_loop_fork on them */
386			/* you can call it in either the parent or the child */
387			/* you can actually call it at any time, anywhere :) */
388			void ev_default_fork (void);
389
390	root	1.63	unsigned int ev_backend (EV_P);
391	root	1.9	#endif
392	root	1.1
393			#define EVLOOP_NONBLOCK 1 /* do not block/wait */
394			#define EVLOOP_ONESHOT 2 /* block once only */
395	root	1.65	#define EVUNLOOP_CANCEL 0 /* undo unloop */
396	root	1.57	#define EVUNLOOP_ONE 1 /* unloop once */
397	root	1.29	#define EVUNLOOP_ALL 2 /* unloop all loops */
398
399	root	1.9	#if EV_PROTOTYPES
400	root	1.27	void ev_loop (EV_P_ int flags);
401	root	1.29	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 */
402	root	1.27
403			/*
404			* ref/unref can be used to add or remove a refcount on the mainloop. every watcher
405			* keeps one reference. if you have a long-runing watcher you never unregister that
406			* should not keep ev_loop from running, unref() after starting, and ref() before stopping.
407			*/
408			void ev_ref (EV_P);
409			void ev_unref (EV_P);
410	root	1.1
411	root	1.9	/* convinience function, wait for a single event, without registering an event watcher */
412			/* if timeout is < 0, do wait indefinitely */
413	root	1.27	void ev_once (EV_P_ int fd, int events, ev_tstamp timeout, void (cb)(int revents, void arg), void *arg);
414	root	1.9	#endif
415
416	root	1.2	/* these may evaluate ev multiple times, and the other arguments at most once */
417	root	1.45	/* either use ev_init + ev_TYPE_set, or the ev_TYPE_init macro, below, to first initialise a watcher */
418			#define ev_init(ev,cb_) do { \
419	root	1.66	((ev_watcher )(void )(ev))->active = \
420			((ev_watcher )(void )(ev))->pending = \
421			((ev_watcher )(void )(ev))->priority = 0; \
422	root	1.45	ev_set_cb ((ev), cb_); \
423	root	1.32	} while (0)
424	root	1.3
425	root	1.16	#define ev_io_set(ev,fd_,events_) do { (ev)->fd = (fd_); (ev)->events = (events_); } while (0)
426			#define ev_timer_set(ev,after_,repeat_) do { (ev)->at = (after_); (ev)->repeat = (repeat_); } while (0)
427	root	1.40	#define ev_periodic_set(ev,at_,ival_,res_) do { (ev)->at = (at_); (ev)->interval = (ival_); (ev)->reschedule_cb= (res_); } while (0)
428	root	1.16	#define ev_signal_set(ev,signum_) do { (ev)->signum = (signum_); } while (0)
429	root	1.70	#define ev_child_set(ev,pid_) do { (ev)->pid = (pid_); } while (0)
430	root	1.74	#define ev_stat_set(ev,path_,interval_) do { (ev)->path = (path_); (ev)->interval = (interval_); (ev)->wd = -2; } while (0)
431	root	1.16	#define ev_idle_set(ev) /* nop, yes, this is a serious in-joke */
432			#define ev_prepare_set(ev) /* nop, yes, this is a serious in-joke */
433			#define ev_check_set(ev) /* nop, yes, this is a serious in-joke */
434	root	1.64	#define ev_embed_set(ev,loop_) do { (ev)->loop = (loop_); } while (0)
435	root	1.72	#define ev_fork_set(ev) /* nop, yes, this is a serious in-joke */
436	root	1.16
437	root	1.45	#define ev_io_init(ev,cb,fd,events) do { ev_init ((ev), (cb)); ev_io_set ((ev),(fd),(events)); } while (0)
438			#define ev_timer_init(ev,cb,after,repeat) do { ev_init ((ev), (cb)); ev_timer_set ((ev),(after),(repeat)); } while (0)
439			#define ev_periodic_init(ev,cb,at,ival,res) do { ev_init ((ev), (cb)); ev_periodic_set ((ev),(at),(ival),(res)); } while (0)
440			#define ev_signal_init(ev,cb,signum) do { ev_init ((ev), (cb)); ev_signal_set ((ev), (signum)); } while (0)
441	root	1.70	#define ev_child_init(ev,cb,pid) do { ev_init ((ev), (cb)); ev_child_set ((ev),(pid)); } while (0)
442			#define ev_stat_init(ev,cb,path,interval) do { ev_init ((ev), (cb)); ev_path_set ((ev),(path),(interval)); } while (0)
443	root	1.45	#define ev_idle_init(ev,cb) do { ev_init ((ev), (cb)); ev_idle_set ((ev)); } while (0)
444			#define ev_prepare_init(ev,cb) do { ev_init ((ev), (cb)); ev_prepare_set ((ev)); } while (0)
445			#define ev_check_init(ev,cb) do { ev_init ((ev), (cb)); ev_check_set ((ev)); } while (0)
446	root	1.64	#define ev_embed_init(ev,cb,loop) do { ev_init ((ev), (cb)); ev_embed_set ((ev),(loop)); } while (0)
447	root	1.72	#define ev_fork_init(ev,cb) do { ev_init ((ev), (cb)); ev_fork_set ((ev)); } while (0)
448	root	1.1
449	root	1.66	#define ev_is_pending(ev) (0 + ((ev_watcher )(void )(ev))->pending) /* ro, true when watcher is waiting for callback invocation */
450			#define ev_is_active(ev) (0 + ((ev_watcher )(void )(ev))->active) /* ro, true when the watcher has been started */
451	root	1.32
452	root	1.66	#define ev_priority(ev) ((ev_watcher )(void )(ev))->priority /* rw */
453	root	1.33	#define ev_cb(ev) (ev)->cb /* rw */
454	root	1.32	#define ev_set_priority(ev,pri) ev_priority (ev) = (pri)
455	root	1.45
456			#ifndef ev_set_cb
457			# define ev_set_cb(ev,cb_) ev_cb (ev) = (cb_)
458			#endif
459	root	1.1
460	root	1.5	/* stopping (enabling, adding) a watcher does nothing if it is already running */
461			/* stopping (disabling, deleting) a watcher does nothing unless its already running */
462	root	1.9	#if EV_PROTOTYPES
463	root	1.41
464			/* feeds an event into a watcher as if the event actually occured */
465			/* accepts any ev_watcher type */
466			void ev_feed_event (EV_P_ void *w, int revents);
467	root	1.42	void ev_feed_fd_event (EV_P_ int fd, int revents);
468			void ev_feed_signal_event (EV_P_ int signum);
469	root	1.41
470	root	1.66	void ev_io_start (EV_P_ ev_io *w);
471			void ev_io_stop (EV_P_ ev_io *w);
472	root	1.6
473	root	1.66	void ev_timer_start (EV_P_ ev_timer *w);
474			void ev_timer_stop (EV_P_ ev_timer *w);
475	root	1.30	/* stops if active and no repeat, restarts if active and repeating, starts if inactive and repeating */
476	root	1.66	void ev_timer_again (EV_P_ ev_timer *w);
477	root	1.1
478	root	1.69	#if EV_PERIODIC_ENABLE
479	root	1.66	void ev_periodic_start (EV_P_ ev_periodic *w);
480			void ev_periodic_stop (EV_P_ ev_periodic *w);
481			void ev_periodic_again (EV_P_ ev_periodic *w);
482	root	1.50	#endif
483	root	1.1
484	root	1.70	/* only supported in the default loop */
485			void ev_signal_start (EV_P_ ev_signal *w);
486			void ev_signal_stop (EV_P_ ev_signal *w);
487
488			/* only supported in the default loop */
489			void ev_child_start (EV_P_ ev_child *w);
490			void ev_child_stop (EV_P_ ev_child *w);
491
492			# if EV_STAT_ENABLE
493			void ev_stat_start (EV_P_ ev_stat *w);
494			void ev_stat_stop (EV_P_ ev_stat *w);
495			void ev_stat_stat (EV_P_ ev_stat *w);
496			# endif
497
498	root	1.66	void ev_idle_start (EV_P_ ev_idle *w);
499			void ev_idle_stop (EV_P_ ev_idle *w);
500	root	1.5
501	root	1.66	void ev_prepare_start (EV_P_ ev_prepare *w);
502			void ev_prepare_stop (EV_P_ ev_prepare *w);
503	root	1.11
504	root	1.66	void ev_check_start (EV_P_ ev_check *w);
505			void ev_check_stop (EV_P_ ev_check *w);
506	root	1.12
507	root	1.72	# if EV_FORK_ENABLE
508			void ev_fork_start (EV_P_ ev_fork *w);
509			void ev_fork_stop (EV_P_ ev_fork *w);
510			# endif
511
512	root	1.69	# if EV_EMBED_ENABLE
513	root	1.64	/* only supported when loop to be embedded is in fact embeddable */
514	root	1.66	void ev_embed_start (EV_P_ ev_embed *w);
515			void ev_embed_stop (EV_P_ ev_embed *w);
516	root	1.68	void ev_embed_sweep (EV_P_ ev_embed *w);
517	root	1.64	# endif
518
519	root	1.9	#endif
520	root	1.5
521	root	1.19	#ifdef __cplusplus
522			}
523			#endif
524
525	root	1.1	#endif
526