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
;
60 struct timespec timeout
= { 0, 0 };
61 struct kevent ev
= {};
70 EV_SET(&ev
, SIGCHLD
, EVFILT_SIGNAL
, EV_ADD
, 0, 0, 0);
71 kevent(poll_fd
, &ev
, 1, NULL
, 0, &timeout
);
77 static uint16_t get_flags(unsigned int flags
, unsigned int mask
)
85 if (flags
& ULOOP_EDGE_TRIGGER
)
91 static struct kevent events
[ULOOP_MAX_EVENTS
];
93 static int register_kevent(struct uloop_fd
*fd
, unsigned int flags
)
95 struct timespec timeout
= { 0, 0 };
102 if (flags
& ULOOP_EDGE_DEFER
)
103 flags
&= ~ULOOP_EDGE_TRIGGER
;
105 changed
= flags
^ fd
->flags
;
106 if (changed
& ULOOP_EDGE_TRIGGER
)
109 if (changed
& ULOOP_READ
) {
110 kflags
= get_flags(flags
, ULOOP_READ
);
111 EV_SET(&ev
[nev
++], fd
->fd
, EVFILT_READ
, kflags
, 0, 0, fd
);
114 if (changed
& ULOOP_WRITE
) {
115 kflags
= get_flags(flags
, ULOOP_WRITE
);
116 EV_SET(&ev
[nev
++], fd
->fd
, EVFILT_WRITE
, kflags
, 0, 0, fd
);
123 if (kevent(poll_fd
, ev
, nev
, NULL
, fl
, &timeout
) == -1)
129 static int register_poll(struct uloop_fd
*fd
, unsigned int flags
)
131 if (flags
& ULOOP_EDGE_TRIGGER
)
132 flags
|= ULOOP_EDGE_DEFER
;
134 flags
&= ~ULOOP_EDGE_DEFER
;
136 return register_kevent(fd
, flags
);
139 int uloop_fd_delete(struct uloop_fd
*sock
)
143 for (i
= cur_fd
+ 1; i
< cur_nfds
; i
++) {
144 if (events
[i
].udata
!= sock
)
147 events
[i
].udata
= NULL
;
150 sock
->registered
= false;
151 return register_poll(sock
, 0);
154 static void uloop_run_events(int timeout
)
160 ts
.tv_sec
= timeout
/ 1000;
161 ts
.tv_nsec
= (timeout
% 1000) * 1000000;
164 nfds
= kevent(poll_fd
, NULL
, 0, events
, ARRAY_SIZE(events
), timeout
>= 0 ? &ts
: NULL
);
165 for(n
= 0; n
< nfds
; ++n
)
167 struct uloop_fd
*u
= events
[n
].udata
;
173 if (events
[n
].flags
& EV_ERROR
) {
178 if(events
[n
].filter
== EVFILT_READ
)
180 else if (events
[n
].filter
== EVFILT_WRITE
)
183 if (events
[n
].flags
& EV_EOF
)
192 if (u
->flags
& ULOOP_EDGE_DEFER
) {
193 u
->flags
&= ~ULOOP_EDGE_DEFER
;
194 register_kevent(u
, u
->flags
);
206 * FIXME: uClibc < 0.9.30.3 does not define EPOLLRDHUP for Linux >= 2.6.17
209 #define EPOLLRDHUP 0x2000
217 poll_fd
= epoll_create(32);
221 fcntl(poll_fd
, F_SETFD
, fcntl(poll_fd
, F_GETFD
) | FD_CLOEXEC
);
225 static int register_poll(struct uloop_fd
*fd
, unsigned int flags
)
227 struct epoll_event ev
;
228 int op
= fd
->registered
? EPOLL_CTL_MOD
: EPOLL_CTL_ADD
;
230 memset(&ev
, 0, sizeof(struct epoll_event
));
232 if (flags
& ULOOP_READ
)
233 ev
.events
|= EPOLLIN
| EPOLLRDHUP
;
235 if (flags
& ULOOP_WRITE
)
236 ev
.events
|= EPOLLOUT
;
238 if (flags
& ULOOP_EDGE_TRIGGER
)
239 ev
.events
|= EPOLLET
;
244 return epoll_ctl(poll_fd
, op
, fd
->fd
, &ev
);
247 static struct epoll_event events
[ULOOP_MAX_EVENTS
];
249 int uloop_fd_delete(struct uloop_fd
*sock
)
253 for (i
= cur_fd
+ 1; i
< cur_nfds
; i
++) {
254 if (events
[i
].data
.ptr
!= sock
)
257 events
[i
].data
.ptr
= NULL
;
259 sock
->registered
= false;
260 return epoll_ctl(poll_fd
, EPOLL_CTL_DEL
, sock
->fd
, 0);
263 static void uloop_run_events(int timeout
)
267 nfds
= epoll_wait(poll_fd
, events
, ARRAY_SIZE(events
), timeout
);
268 for(n
= 0; n
< nfds
; ++n
)
270 struct uloop_fd
*u
= events
[n
].data
.ptr
;
276 if(events
[n
].events
& (EPOLLERR
|EPOLLHUP
)) {
281 if(!(events
[n
].events
& (EPOLLRDHUP
|EPOLLIN
|EPOLLOUT
|EPOLLERR
|EPOLLHUP
)))
284 if(events
[n
].events
& EPOLLRDHUP
)
287 if(events
[n
].events
& EPOLLIN
)
290 if(events
[n
].events
& EPOLLOUT
)
304 int uloop_fd_add(struct uloop_fd
*sock
, unsigned int flags
)
309 if (!sock
->registered
&& !(flags
& ULOOP_BLOCKING
)) {
310 fl
= fcntl(sock
->fd
, F_GETFL
, 0);
312 fcntl(sock
->fd
, F_SETFL
, fl
);
315 ret
= register_poll(sock
, flags
);
319 sock
->registered
= true;
326 static int tv_diff(struct timeval
*t1
, struct timeval
*t2
)
329 (t1
->tv_sec
- t2
->tv_sec
) * 1000 +
330 (t1
->tv_usec
- t2
->tv_usec
) / 1000;
333 int uloop_timeout_add(struct uloop_timeout
*timeout
)
335 struct uloop_timeout
*tmp
;
336 struct list_head
*h
= &timeouts
;
338 if (timeout
->pending
)
341 list_for_each_entry(tmp
, &timeouts
, list
) {
342 if (tv_diff(&tmp
->time
, &timeout
->time
) > 0) {
348 list_add_tail(&timeout
->list
, h
);
349 timeout
->pending
= true;
354 static void uloop_gettime(struct timeval
*tv
)
358 clock_gettime(CLOCK_MONOTONIC
, &ts
);
359 tv
->tv_sec
= ts
.tv_sec
;
360 tv
->tv_usec
= ts
.tv_nsec
/ 1000;
363 int uloop_timeout_set(struct uloop_timeout
*timeout
, int msecs
)
365 struct timeval
*time
= &timeout
->time
;
367 if (timeout
->pending
)
368 uloop_timeout_cancel(timeout
);
370 uloop_gettime(&timeout
->time
);
372 time
->tv_sec
+= msecs
/ 1000;
373 time
->tv_usec
+= (msecs
% 1000) * 1000;
375 if (time
->tv_usec
> 1000000) {
377 time
->tv_usec
%= 1000000;
380 return uloop_timeout_add(timeout
);
383 int uloop_timeout_cancel(struct uloop_timeout
*timeout
)
385 if (!timeout
->pending
)
388 list_del(&timeout
->list
);
389 timeout
->pending
= false;
394 int uloop_process_add(struct uloop_process
*p
)
396 struct uloop_process
*tmp
;
397 struct list_head
*h
= &processes
;
402 list_for_each_entry(tmp
, &processes
, list
) {
403 if (tmp
->pid
> p
->pid
) {
409 list_add_tail(&p
->list
, h
);
415 int uloop_process_delete(struct uloop_process
*p
)
426 static void uloop_handle_processes(void)
428 struct uloop_process
*p
, *tmp
;
435 pid
= waitpid(-1, &ret
, WNOHANG
);
439 list_for_each_entry_safe(p
, tmp
, &processes
, list
) {
446 uloop_process_delete(p
);
453 static void uloop_handle_sigint(int signo
)
455 uloop_cancelled
= true;
458 static void uloop_sigchld(int signo
)
463 static void uloop_setup_signals(void)
467 memset(&s
, 0, sizeof(struct sigaction
));
468 s
.sa_handler
= uloop_handle_sigint
;
470 sigaction(SIGINT
, &s
, NULL
);
472 if (uloop_handle_sigchld
) {
473 s
.sa_handler
= uloop_sigchld
;
474 sigaction(SIGCHLD
, &s
, NULL
);
478 static int uloop_get_next_timeout(struct timeval
*tv
)
480 struct uloop_timeout
*timeout
;
483 if (list_empty(&timeouts
))
486 timeout
= list_first_entry(&timeouts
, struct uloop_timeout
, list
);
487 diff
= tv_diff(&timeout
->time
, tv
);
494 static void uloop_process_timeouts(struct timeval
*tv
)
496 struct uloop_timeout
*t
;
498 while (!list_empty(&timeouts
)) {
499 t
= list_first_entry(&timeouts
, struct uloop_timeout
, list
);
501 if (tv_diff(&t
->time
, tv
) > 0)
504 uloop_timeout_cancel(t
);
510 static void uloop_clear_timeouts(void)
512 struct uloop_timeout
*t
, *tmp
;
514 list_for_each_entry_safe(t
, tmp
, &timeouts
, list
)
515 uloop_timeout_cancel(t
);
518 static void uloop_clear_processes(void)
520 struct uloop_process
*p
, *tmp
;
522 list_for_each_entry_safe(p
, tmp
, &processes
, list
)
523 uloop_process_delete(p
);
530 uloop_setup_signals();
531 while(!uloop_cancelled
)
534 uloop_process_timeouts(&tv
);
539 uloop_handle_processes();
540 uloop_run_events(uloop_get_next_timeout(&tv
));
544 void uloop_done(void)
552 uloop_clear_timeouts();
553 uloop_clear_processes();