1257a38a6e
It hasn't fixed the reported race condition and it introduced some new issues. Signed-off-by: Felix Fietkau <nbd@nbd.name>
148 lines
3.3 KiB
C
148 lines
3.3 KiB
C
/*
|
|
* uloop - event loop implementation
|
|
*
|
|
* Copyright (C) 2010-2016 Felix Fietkau <nbd@openwrt.org>
|
|
*
|
|
* Permission to use, copy, modify, and/or distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice appear in all copies.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
|
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
|
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
*/
|
|
int uloop_init(void)
|
|
{
|
|
struct timespec timeout = { 0, 0 };
|
|
struct kevent ev = {};
|
|
|
|
if (poll_fd >= 0)
|
|
return 0;
|
|
|
|
poll_fd = kqueue();
|
|
if (poll_fd < 0)
|
|
return -1;
|
|
|
|
EV_SET(&ev, SIGCHLD, EVFILT_SIGNAL, EV_ADD, 0, 0, 0);
|
|
kevent(poll_fd, &ev, 1, NULL, 0, &timeout);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static uint16_t get_flags(unsigned int flags, unsigned int mask)
|
|
{
|
|
uint16_t kflags = 0;
|
|
|
|
if (!(flags & mask))
|
|
return EV_DELETE;
|
|
|
|
kflags = EV_ADD;
|
|
if (flags & ULOOP_EDGE_TRIGGER)
|
|
kflags |= EV_CLEAR;
|
|
|
|
return kflags;
|
|
}
|
|
|
|
static struct kevent events[ULOOP_MAX_EVENTS];
|
|
|
|
static int register_kevent(struct uloop_fd *fd, unsigned int flags)
|
|
{
|
|
struct timespec timeout = { 0, 0 };
|
|
struct kevent ev[2];
|
|
int nev = 0;
|
|
unsigned int fl = 0;
|
|
unsigned int changed;
|
|
uint16_t kflags;
|
|
|
|
if (flags & ULOOP_EDGE_DEFER)
|
|
flags &= ~ULOOP_EDGE_TRIGGER;
|
|
|
|
changed = flags ^ fd->flags;
|
|
if (changed & ULOOP_EDGE_TRIGGER)
|
|
changed |= flags;
|
|
|
|
if (changed & ULOOP_READ) {
|
|
kflags = get_flags(flags, ULOOP_READ);
|
|
EV_SET(&ev[nev++], fd->fd, EVFILT_READ, kflags, 0, 0, fd);
|
|
}
|
|
|
|
if (changed & ULOOP_WRITE) {
|
|
kflags = get_flags(flags, ULOOP_WRITE);
|
|
EV_SET(&ev[nev++], fd->fd, EVFILT_WRITE, kflags, 0, 0, fd);
|
|
}
|
|
|
|
if (!flags)
|
|
fl |= EV_DELETE;
|
|
|
|
fd->flags = flags;
|
|
if (kevent(poll_fd, ev, nev, NULL, fl, &timeout) == -1)
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int register_poll(struct uloop_fd *fd, unsigned int flags)
|
|
{
|
|
if (flags & ULOOP_EDGE_TRIGGER)
|
|
flags |= ULOOP_EDGE_DEFER;
|
|
else
|
|
flags &= ~ULOOP_EDGE_DEFER;
|
|
|
|
return register_kevent(fd, flags);
|
|
}
|
|
|
|
static int __uloop_fd_delete(struct uloop_fd *fd)
|
|
{
|
|
return register_poll(fd, 0);
|
|
}
|
|
|
|
static int uloop_fetch_events(int timeout)
|
|
{
|
|
struct timespec ts;
|
|
int nfds, n;
|
|
|
|
if (timeout >= 0) {
|
|
ts.tv_sec = timeout / 1000;
|
|
ts.tv_nsec = (timeout % 1000) * 1000000;
|
|
}
|
|
|
|
nfds = kevent(poll_fd, NULL, 0, events, ARRAY_SIZE(events), timeout >= 0 ? &ts : NULL);
|
|
for (n = 0; n < nfds; n++) {
|
|
struct uloop_fd_event *cur = &cur_fds[n];
|
|
struct uloop_fd *u = events[n].udata;
|
|
unsigned int ev = 0;
|
|
|
|
cur->fd = u;
|
|
if (!u)
|
|
continue;
|
|
|
|
if (events[n].flags & EV_ERROR) {
|
|
u->error = true;
|
|
if (!(u->flags & ULOOP_ERROR_CB))
|
|
uloop_fd_delete(u);
|
|
}
|
|
|
|
if(events[n].filter == EVFILT_READ)
|
|
ev |= ULOOP_READ;
|
|
else if (events[n].filter == EVFILT_WRITE)
|
|
ev |= ULOOP_WRITE;
|
|
|
|
if (events[n].flags & EV_EOF)
|
|
u->eof = true;
|
|
else if (!ev)
|
|
cur->fd = NULL;
|
|
|
|
cur->events = ev;
|
|
if (u->flags & ULOOP_EDGE_DEFER) {
|
|
u->flags &= ~ULOOP_EDGE_DEFER;
|
|
u->flags |= ULOOP_EDGE_TRIGGER;
|
|
register_kevent(u, u->flags);
|
|
}
|
|
}
|
|
return nfds;
|
|
}
|