2 * Copyright (C) 2010 Felix Fietkau <nbd@openwrt.org>
3 * Copyright (C) 2010 John Crispin <blogic@openwrt.org>
4 * Copyright (C) 2010 Steven Barth <steven@midlink.org>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
23 #include <sys/types.h>
38 #include <sys/event.h>
41 #include <sys/epoll.h>
45 #define ULOOP_MAX_EVENTS 10
47 static struct list_head timeouts
= LIST_HEAD_INIT(timeouts
);
48 static struct list_head processes
= LIST_HEAD_INIT(processes
);
50 static int poll_fd
= -1;
51 bool uloop_cancelled
= false;
52 bool uloop_handle_sigchld
= true;
53 static bool do_sigchld
= false;
54 static int cur_fd
, cur_nfds
;
71 static uint16_t get_flags(unsigned int flags
, unsigned int mask
)
79 if (flags
& ULOOP_EDGE_TRIGGER
)
85 static struct kevent events
[ULOOP_MAX_EVENTS
];
87 static int register_poll(struct uloop_fd
*fd
, unsigned int flags
)
89 struct timespec timeout
= { 0, 0 };
95 changed
= fd
->kqflags
^ flags
;
96 if (changed
& ULOOP_EDGE_TRIGGER
)
99 if (changed
& ULOOP_READ
) {
100 uint16_t kflags
= get_flags(flags
, ULOOP_READ
);
101 EV_SET(&ev
[nev
++], fd
->fd
, EVFILT_READ
, kflags
, 0, 0, fd
);
104 if (changed
& ULOOP_WRITE
) {
105 uint16_t kflags
= get_flags(flags
, ULOOP_WRITE
);
106 EV_SET(&ev
[nev
++], fd
->fd
, EVFILT_WRITE
, kflags
, 0, 0, fd
);
112 if (nev
&& (kevent(poll_fd
, ev
, nev
, NULL
, fl
, &timeout
) == -1))
119 int uloop_fd_delete(struct uloop_fd
*sock
)
123 for (i
= cur_fd
+ 1; i
< cur_nfds
; i
++) {
124 if (events
[i
].udata
!= sock
)
127 events
[i
].udata
= NULL
;
130 sock
->registered
= false;
131 return register_poll(sock
, 0);
134 static void uloop_run_events(int timeout
)
140 ts
.tv_sec
= timeout
/ 1000;
141 ts
.tv_nsec
= (timeout
% 1000) * 1000000;
144 nfds
= kevent(poll_fd
, NULL
, 0, events
, ARRAY_SIZE(events
), timeout
>= 0 ? &ts
: NULL
);
145 for(n
= 0; n
< nfds
; ++n
)
147 struct uloop_fd
*u
= events
[n
].udata
;
153 if (events
[n
].flags
& EV_ERROR
) {
158 if(events
[n
].filter
== EVFILT_READ
)
160 else if (events
[n
].filter
== EVFILT_WRITE
)
163 if (events
[n
].flags
& EV_EOF
)
182 * FIXME: uClibc < 0.9.30.3 does not define EPOLLRDHUP for Linux >= 2.6.17
185 #define EPOLLRDHUP 0x2000
193 poll_fd
= epoll_create(32);
197 fcntl(poll_fd
, F_SETFD
, fcntl(poll_fd
, F_GETFD
) | FD_CLOEXEC
);
201 static int register_poll(struct uloop_fd
*fd
, unsigned int flags
)
203 struct epoll_event ev
;
204 int op
= fd
->registered
? EPOLL_CTL_MOD
: EPOLL_CTL_ADD
;
206 memset(&ev
, 0, sizeof(struct epoll_event
));
208 if (flags
& ULOOP_READ
)
209 ev
.events
|= EPOLLIN
| EPOLLRDHUP
;
211 if (flags
& ULOOP_WRITE
)
212 ev
.events
|= EPOLLOUT
;
214 if (flags
& ULOOP_EDGE_TRIGGER
)
215 ev
.events
|= EPOLLET
;
220 return epoll_ctl(poll_fd
, op
, fd
->fd
, &ev
);
223 static struct epoll_event events
[ULOOP_MAX_EVENTS
];
225 int uloop_fd_delete(struct uloop_fd
*sock
)
229 for (i
= cur_fd
+ 1; i
< cur_nfds
; i
++) {
230 if (events
[i
].data
.ptr
!= sock
)
233 events
[i
].data
.ptr
= NULL
;
235 sock
->registered
= false;
236 return epoll_ctl(poll_fd
, EPOLL_CTL_DEL
, sock
->fd
, 0);
239 static void uloop_run_events(int timeout
)
243 nfds
= epoll_wait(poll_fd
, events
, ARRAY_SIZE(events
), timeout
);
244 for(n
= 0; n
< nfds
; ++n
)
246 struct uloop_fd
*u
= events
[n
].data
.ptr
;
252 if(events
[n
].events
& (EPOLLERR
|EPOLLHUP
)) {
257 if(!(events
[n
].events
& (EPOLLRDHUP
|EPOLLIN
|EPOLLOUT
|EPOLLERR
|EPOLLHUP
)))
260 if(events
[n
].events
& EPOLLRDHUP
)
263 if(events
[n
].events
& EPOLLIN
)
266 if(events
[n
].events
& EPOLLOUT
)
280 int uloop_fd_add(struct uloop_fd
*sock
, unsigned int flags
)
285 if (!sock
->registered
&& !(flags
& ULOOP_BLOCKING
)) {
286 fl
= fcntl(sock
->fd
, F_GETFL
, 0);
288 fcntl(sock
->fd
, F_SETFL
, fl
);
291 ret
= register_poll(sock
, flags
);
295 sock
->registered
= true;
302 static int tv_diff(struct timeval
*t1
, struct timeval
*t2
)
305 (t1
->tv_sec
- t2
->tv_sec
) * 1000 +
306 (t1
->tv_usec
- t2
->tv_usec
) / 1000;
309 int uloop_timeout_add(struct uloop_timeout
*timeout
)
311 struct uloop_timeout
*tmp
;
312 struct list_head
*h
= &timeouts
;
314 if (timeout
->pending
)
317 list_for_each_entry(tmp
, &timeouts
, list
) {
318 if (tv_diff(&tmp
->time
, &timeout
->time
) > 0) {
324 list_add_tail(&timeout
->list
, h
);
325 timeout
->pending
= true;
330 int uloop_timeout_set(struct uloop_timeout
*timeout
, int msecs
)
332 struct timeval
*time
= &timeout
->time
;
334 if (timeout
->pending
)
335 uloop_timeout_cancel(timeout
);
337 gettimeofday(&timeout
->time
, NULL
);
339 time
->tv_sec
+= msecs
/ 1000;
340 time
->tv_usec
+= (msecs
% 1000) * 1000;
342 if (time
->tv_usec
> 1000000) {
344 time
->tv_usec
%= 1000000;
347 return uloop_timeout_add(timeout
);
350 int uloop_timeout_cancel(struct uloop_timeout
*timeout
)
352 if (!timeout
->pending
)
355 list_del(&timeout
->list
);
356 timeout
->pending
= false;
361 int uloop_process_add(struct uloop_process
*p
)
363 struct uloop_process
*tmp
;
364 struct list_head
*h
= &processes
;
369 list_for_each_entry(tmp
, &processes
, list
) {
370 if (tmp
->pid
> p
->pid
) {
376 list_add_tail(&p
->list
, h
);
382 int uloop_process_delete(struct uloop_process
*p
)
393 static void uloop_handle_processes(void)
395 struct uloop_process
*p
, *tmp
;
402 pid
= waitpid(-1, &ret
, WNOHANG
);
406 list_for_each_entry_safe(p
, tmp
, &processes
, list
) {
413 uloop_process_delete(p
);
420 static void uloop_handle_sigint(int signo
)
422 uloop_cancelled
= true;
425 static void uloop_sigchld(int signo
)
430 static void uloop_setup_signals(void)
434 memset(&s
, 0, sizeof(struct sigaction
));
435 s
.sa_handler
= uloop_handle_sigint
;
437 sigaction(SIGINT
, &s
, NULL
);
439 if (uloop_handle_sigchld
) {
440 s
.sa_handler
= uloop_sigchld
;
441 sigaction(SIGCHLD
, &s
, NULL
);
445 static int uloop_get_next_timeout(struct timeval
*tv
)
447 struct uloop_timeout
*timeout
;
450 if (list_empty(&timeouts
))
453 timeout
= list_first_entry(&timeouts
, struct uloop_timeout
, list
);
454 diff
= tv_diff(&timeout
->time
, tv
);
461 static void uloop_process_timeouts(struct timeval
*tv
)
463 struct uloop_timeout
*t
;
465 while (!list_empty(&timeouts
)) {
466 t
= list_first_entry(&timeouts
, struct uloop_timeout
, list
);
468 if (tv_diff(&t
->time
, tv
) > 0)
471 uloop_timeout_cancel(t
);
477 static void uloop_clear_timeouts(void)
479 struct uloop_timeout
*t
, *tmp
;
481 list_for_each_entry_safe(t
, tmp
, &timeouts
, list
)
482 uloop_timeout_cancel(t
);
485 static void uloop_clear_processes(void)
487 struct uloop_process
*p
, *tmp
;
489 list_for_each_entry_safe(p
, tmp
, &processes
, list
)
490 uloop_process_delete(p
);
497 uloop_setup_signals();
498 while(!uloop_cancelled
)
500 gettimeofday(&tv
, NULL
);
501 uloop_process_timeouts(&tv
);
506 uloop_handle_processes();
507 uloop_run_events(uloop_get_next_timeout(&tv
));
511 void uloop_done(void)
519 uloop_clear_timeouts();
520 uloop_clear_processes();