2 * uloop - event loop implementation
4 * Copyright (C) 2010-2016 Felix Fietkau <nbd@openwrt.org>
6 * Permission to use, copy, modify, and/or distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 static int uloop_init_pollfd(void)
20 struct timespec timeout
= { 0, 0 };
21 struct kevent ev
= {};
30 EV_SET(&ev
, SIGCHLD
, EVFILT_SIGNAL
, EV_ADD
, 0, 0, 0);
31 kevent(poll_fd
, &ev
, 1, NULL
, 0, &timeout
);
37 static uint16_t get_flags(unsigned int flags
, unsigned int mask
)
45 if (flags
& ULOOP_EDGE_TRIGGER
)
51 static struct kevent events
[ULOOP_MAX_EVENTS
];
53 static int register_kevent(struct uloop_fd
*fd
, unsigned int flags
)
55 struct timespec timeout
= { 0, 0 };
62 if (flags
& ULOOP_EDGE_DEFER
)
63 flags
&= ~ULOOP_EDGE_TRIGGER
;
65 changed
= flags
^ fd
->flags
;
66 if (changed
& ULOOP_EDGE_TRIGGER
)
69 if (changed
& ULOOP_READ
) {
70 kflags
= get_flags(flags
, ULOOP_READ
);
71 EV_SET(&ev
[nev
++], fd
->fd
, EVFILT_READ
, kflags
, 0, 0, fd
);
74 if (changed
& ULOOP_WRITE
) {
75 kflags
= get_flags(flags
, ULOOP_WRITE
);
76 EV_SET(&ev
[nev
++], fd
->fd
, EVFILT_WRITE
, kflags
, 0, 0, fd
);
83 if (kevent(poll_fd
, ev
, nev
, NULL
, fl
, &timeout
) == -1)
89 static int register_poll(struct uloop_fd
*fd
, unsigned int flags
)
91 if (flags
& ULOOP_EDGE_TRIGGER
)
92 flags
|= ULOOP_EDGE_DEFER
;
94 flags
&= ~ULOOP_EDGE_DEFER
;
96 return register_kevent(fd
, flags
);
99 static int __uloop_fd_delete(struct uloop_fd
*fd
)
101 return register_poll(fd
, 0);
104 static int uloop_fetch_events(int timeout
)
110 ts
.tv_sec
= timeout
/ 1000;
111 ts
.tv_nsec
= (timeout
% 1000) * 1000000;
114 nfds
= kevent(poll_fd
, NULL
, 0, events
, ARRAY_SIZE(events
), timeout
>= 0 ? &ts
: NULL
);
115 for (n
= 0; n
< nfds
; n
++) {
116 struct uloop_fd_event
*cur
= &cur_fds
[n
];
117 struct uloop_fd
*u
= events
[n
].udata
;
124 if (events
[n
].flags
& EV_ERROR
) {
126 if (!(u
->flags
& ULOOP_ERROR_CB
))
130 if(events
[n
].filter
== EVFILT_READ
)
132 else if (events
[n
].filter
== EVFILT_WRITE
)
135 if (events
[n
].flags
& EV_EOF
)
141 if (u
->flags
& ULOOP_EDGE_DEFER
) {
142 u
->flags
&= ~ULOOP_EDGE_DEFER
;
143 u
->flags
|= ULOOP_EDGE_TRIGGER
;
144 register_kevent(u
, u
->flags
);