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netpoll_freebsd.c
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netpoll_freebsd.c
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#include "runtime.h"
#include <errno.h>
#include <sys/event.h>
#include <time.h>
static int kq = -1;
void netpollinit(void) {
kq = kqueue();
if (kq < 0)
throw("netpollinit: kqueue failed with %d", kq);
setcloexec(kq);
}
int netpollopen(Event *ep) {
struct kevent ev[2];
ev[0].ident = ep->fd;
ev[0].filter = EVFILT_READ;
ev[0].flags = EV_ADD | EV_CLEAR; /* edge-triggered */
ev[0].fflags = 0;
ev[0].data = 0;
ev[0].udata = (void *)ep;
ev[1] = ev[0];
ev[1].filter = EVFILT_WRITE;
return kevent(kq, ev, 2, nil, 0, nil);
}
G *netpoll(long ns) {
struct kevent ev[64], *ep;
struct timespec ts, *tsp = nil;
G *gp;
int n, i, mode;
if (kq < 0)
return nil;
if (ns >= 0) {
ts.tv_sec = ns / 1000000000L;
ts.tv_nsec = ns % 1000000000L;
tsp = &ts;
}
retry:
gp = nil;
n = kevent(kq, nil, 0, ev, len(ev), tsp);
if (n < 0) {
if (n == -EINTR)
goto retry;
throw("netpoll: kevent failed with %d", n);
}
#ifdef DEBUG
debug("netpoll: n=%d ts.tv_sec=%ld ts.tv_nsec=%d", n, ts.tv_sec, ts.tv_nsec);
#endif
for (i = 0; i < n; i++) {
ep = ev + i;
mode = 0;
if (ep->filter == EVFILT_READ)
mode |= EV_READ;
if (ep->filter == EVFILT_WRITE)
mode |= EV_WRITE;
if (mode)
netpollready(&gp, (Event *)ep->udata, mode);
}
return gp;
}