/* * Copyright (c) 2007 Marc Alexander Lehmann * 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 typedef double ev_tstamp; /* eventmask, revents, events... */ #define EV_UNDEF -1 /* guaranteed to be invalid */ #define EV_NONE 0x00 #define EV_READ 0x01 #define EV_WRITE 0x02 #define EV_TIMEOUT 0x04 #define EV_SIGNAL 0x08 #define EV_IDLE 0x10 #define EV_CHECK 0x20 #define EV_PREPARE 0x40 #define EV_CHILD 0x80 #define EV_ERROR (0xff|0x8000) /* can be used to add custom fields to all watchers */ #ifndef EV_COMMON # define EV_COMMON void *data #endif #ifndef EV_PROTOTYPES # define EV_PROTOTYPES 1 #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 */ \ EV_COMMON; /* rw */ \ void (*cb)(struct type *, int revents); /* rw */ /* gets invoked with an eventmask */ #define EV_WATCHER_LIST(type) \ EV_WATCHER (type); \ struct type *next /* private */ #define EV_WATCHER_TIME(type) \ EV_WATCHER (type); \ ev_tstamp at /* private */ /* base class, nothing to see here unless you subclass */ struct ev_watcher { EV_WATCHER (ev_watcher); }; /* base class, nothing to see here unless you subclass */ struct ev_watcher_list { EV_WATCHER_LIST (ev_watcher_list); }; /* base class, nothing to see here unless you subclass */ struct ev_watcher_time { EV_WATCHER_TIME (ev_watcher_time); }; /* invoked after a specific time, repeatable (based on monotonic clock) */ struct ev_timer { EV_WATCHER_TIME (ev_timer); ev_tstamp repeat; /* rw */ }; /* invoked at some specific time, possibly repeating at regular intervals (based on UTC) */ struct ev_periodic { EV_WATCHER_TIME (ev_periodic); ev_tstamp interval; /* rw */ }; /* invoked when fd is either EV_READable or EV_WRITEable */ struct ev_io { EV_WATCHER_LIST (ev_io); int fd; /* ro */ int events; /* ro */ }; /* invoked when the given signal has been received */ struct ev_signal { EV_WATCHER_LIST (ev_signal); int signum; /* ro */ }; /* invoked when the nothing else needs to be done, keeps the process from blocking */ struct ev_idle { EV_WATCHER (ev_idle); }; /* invoked for each run of the mainloop, just before the blocking call */ /* you can still change events in any way you like */ struct ev_prepare { EV_WATCHER (ev_prepare); }; /* invoked for each run of the mainloop, just after the blocking call */ struct ev_check { EV_WATCHER (ev_check); }; /* invoked when sigchld is received and waitpid indicates the givne pid */ struct ev_child { EV_WATCHER_LIST (ev_child); int pid; /* ro */ int status; /* holds the exit status, use the macros from sys/wait.h */ }; #define EVMETHOD_NONE 0 #define EVMETHOD_SELECT 1 #define EVMETHOD_EPOLL 2 #if EV_PROTOTYPES extern int ev_method; int ev_init (int flags); /* returns ev_method */ /* these three calls are suitable for plugging into pthread_atfork */ void ev_prefork (void); void ev_postfork_parent (void); void ev_postfork_child (void); extern ev_tstamp ev_now; /* time w.r.t. timers and the eventloop, updated after each poll */ ev_tstamp ev_time (void); #endif #define EVLOOP_NONBLOCK 1 /* do not block/wait */ #define EVLOOP_ONESHOT 2 /* block *once* only */ #if EV_PROTOTYPES void ev_loop (int flags); extern int ev_loop_done; /* set to 1 to break out of event loop, set to 2 to break out of all event loops */ /* convinience function, wait for a single event, without registering an event watcher */ /* if timeout is < 0, do wait indefinitely */ void ev_once (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 evw_init + evXXX_set, or the evXXX_init macro, below, to first initialise a watcher */ #define evw_init(ev,cb_) do { (ev)->active = 0; (ev)->pending = 0; (ev)->cb = (cb_); } while (0) #define evio_set(ev,fd_,events_) do { (ev)->fd = (fd_); (ev)->events = (events_); } while (0) #define evtimer_set(ev,after_,repeat_) do { (ev)->at = (after_); (ev)->repeat = (repeat_); } while (0) #define evperiodic_set(ev,at_,interval_) do { (ev)->at = (at_); (ev)->interval = (interval_); } while (0) #define evsignal_set(ev,signum_) do { (ev)->signum = (signum_); } while (0) #define evidle_set(ev) /* nop, yes, this is a serious in-joke */ #define evprepare_set(ev) /* nop, yes, this is a serious in-joke */ #define evcheck_set(ev) /* nop, yes, this is a serious in-joke */ #define evchild_set(ev,pid_) do { (ev)->pid = (pid_); } while (0) #define evio_init(ev,cb,fd,events) do { evw_init ((ev), (cb)); evio_set ((ev),(fd),(events)); } while (0) #define evtimer_init(ev,cb,after,repeat) do { evw_init ((ev), (cb)); evtimer_set ((ev),(after),(repeat)); } while (0) #define evperiodic_init(ev,cb,at,interval) do { evw_init ((ev), (cb)); evperiodic_set ((ev),(at),(interval)); } while (0) #define evsignal_init(ev,cb,signum) do { evw_init ((ev), (cb)); evsignal_set ((ev), (signum)); } while (0) #define evidle_init(ev,cb) do { evw_init ((ev), (cb)); evidle_set ((ev)); } while (0) #define evprepare_init(ev,cb) do { evw_init ((ev), (cb)); evprepare_set ((ev)); } while (0) #define evcheck_init(ev,cb) do { evw_init ((ev), (cb)); evcheck_set ((ev)); } while (0) #define evchild_init(ev,cb,pid) do { evw_init ((ev), (cb)); evchild_set ((ev),(pid)); } while (0) #define ev_is_active(ev) (0 + (ev)->active) /* true when the watcher has been started */ /* 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 void evio_start (struct ev_io *w); void evio_stop (struct ev_io *w); void evtimer_start (struct ev_timer *w); void evtimer_stop (struct ev_timer *w); void evtimer_again (struct ev_timer *w); /* stops if active and no repeat, restarts if active and repeating, starts if inactive and repeating */ void evperiodic_start (struct ev_periodic *w); void evperiodic_stop (struct ev_periodic *w); void evsignal_start (struct ev_signal *w); void evsignal_stop (struct ev_signal *w); void evidle_start (struct ev_idle *w); void evidle_stop (struct ev_idle *w); void evprepare_start (struct ev_prepare *w); void evprepare_stop (struct ev_prepare *w); void evcheck_start (struct ev_check *w); void evcheck_stop (struct ev_check *w); void evchild_start (struct ev_child *w); void evchild_stop (struct ev_child *w); #endif #endif