X-Git-Url: https://git.llucax.com/software/libev.git/blobdiff_plain/120eeba0bed6b77e91b32b8cd0fb875c314bc092..5446fa15c54ea807294a3fe0645b588a9dae365e:/ev_kqueue.c diff --git a/ev_kqueue.c b/ev_kqueue.c index 8785d10..41a5dbe 100644 --- a/ev_kqueue.c +++ b/ev_kqueue.c @@ -1,4 +1,3 @@ - /* * Copyright 2007 Marc Alexander Lehmann * Copyright 2000-2002 Niels Provos @@ -35,105 +34,132 @@ #include #include -static int kq_fd; -static struct kevent *kq_changes; -static int kq_changemax, kq_changecnt; -static struct kevent *kq_events; -static int kq_eventmax; - static void -kqueue_change (int fd, int filter, int flags, int fflags) +kqueue_change (EV_P_ int fd, int filter, int flags, int fflags) { struct kevent *ke; - array_needsize (kq_changes, kq_changemax, ++kq_changecnt, ); + ++kqueue_changecnt; + array_needsize (struct kevent, kqueue_changes, kqueue_changemax, kqueue_changecnt, EMPTY2); - ke = &kq_changes [kq_changecnt - 1]; - memset (ke, 0, sizeof (struct kevent)); - ke->ident = fd; - ke->filter = filter; - ke->flags = flags; - ke->fflags = fflags; + EV_SET (&kqueue_changes [kqueue_changecnt - 1], fd, filter, flags, fflags, 0, 0); } +#ifndef NOTE_EOF +# define NOTE_EOF 0 +#endif + static void -kqueue_modify (int fd, int oev, int nev) +kqueue_modify (EV_P_ int fd, int oev, int nev) { - if ((oev ^ new) & EV_READ) + if (oev != nev) { - if (nev & EV_READ) - kqueue_change (fd, EVFILT_READ, EV_ADD, NOTE_EOF); - else - kqueue_change (fd, EVFILT_READ, EV_DELETE, 0); - } + if (oev & EV_READ) + kqueue_change (EV_A_ fd, EVFILT_READ , EV_DELETE, 0); - if ((oev ^ new) & EV_WRITE) - { - if (nev & EV_WRITE) - kqueue_change (fd, EVFILT_WRITE, EV_ADD, NOTE_EOF); - else - kqueue_change (fd, EVFILT_WRITE, EV_DELETE, 0); + if (oev & EV_WRITE) + kqueue_change (EV_A_ fd, EVFILT_WRITE, EV_DELETE, 0); } + + /* to detect close/reopen reliably, we have to re-add */ + /* event requests even when oev == nev */ + + if (nev & EV_READ) + kqueue_change (EV_A_ fd, EVFILT_READ , EV_ADD, NOTE_EOF); + + if (nev & EV_WRITE) + kqueue_change (EV_A_ fd, EVFILT_WRITE, EV_ADD, NOTE_EOF); } static void -kqueue_poll (ev_tstamp timeout) +kqueue_poll (EV_P_ ev_tstamp timeout) { int res, i; struct timespec ts; + /* need to resize so there is enough space for errors */ + if (kqueue_changecnt > kqueue_eventmax) + { + ev_free (kqueue_events); + kqueue_eventmax = array_roundsize (struct kevent, kqueue_changecnt); + kqueue_events = (struct kevent *)ev_malloc (sizeof (struct kevent) * kqueue_eventmax); + } + ts.tv_sec = (time_t)timeout; - ts.tv_nsec = (long)(timeout - (ev_tstamp)ts.tv_sec) * 1e9; - res = kevent (kq_fd, kq_changes, kq_changecnt, kq_events, kq_eventmax, &ts); - kq_changecnt = 0; + ts.tv_nsec = (long)((timeout - (ev_tstamp)ts.tv_sec) * 1e9); + res = kevent (backend_fd, kqueue_changes, kqueue_changecnt, kqueue_events, kqueue_eventmax, &ts); + kqueue_changecnt = 0; if (res < 0) - return; + { + if (errno != EINTR) + syserr ("(libev) kevent"); + + return; + } for (i = 0; i < res; ++i) { - if (kq_events [i].flags & EV_ERROR) + int fd = kqueue_events [i].ident; + + if (expect_false (kqueue_events [i].flags & EV_ERROR)) { + int err = kqueue_events [i].data; + /* - * Error messages that can happen, when a delete fails. + * errors that may happen * EBADF happens when the file discriptor has been * closed, - * ENOENT when the file discriptor was closed and + * ENOENT when the file descriptor was closed and * then reopened. * EINVAL for some reasons not understood; EINVAL * should not be returned ever; but FreeBSD does :-\ - * An error is also indicated when a callback deletes - * an event we are still processing. In that case - * the data field is set to ENOENT. */ - if (events [i].data == EBADF) - fd_kill (events [i].ident); + + /* we are only interested in errors for fds that we are interested in :) */ + if (anfds [fd].events) + { + if (err == ENOENT) /* resubmit changes on ENOENT */ + kqueue_modify (EV_A_ fd, 0, anfds [fd].events); + else if (err == EBADF) /* on EBADF, we re-check the fd */ + { + if (fd_valid (fd)) + kqueue_modify (EV_A_ fd, 0, anfds [fd].events); + else + fd_kill (EV_A_ fd); + } + else /* on all other errors, we error out on the fd */ + fd_kill (EV_A_ fd); + } } else fd_event ( - events [i].ident, - events [i].filter == EVFILT_READ ? EV_READ - : events [i].filter == EVFILT_WRITE ? EV_WRITE + EV_A_ + fd, + kqueue_events [i].filter == EVFILT_READ ? EV_READ + : kqueue_events [i].filter == EVFILT_WRITE ? EV_WRITE : 0 ); } - if (expect_false (res == kq_eventmax)) + if (expect_false (res == kqueue_eventmax)) { - free (kq_events); - kq_eventmax = array_roundsize (kq_events, kq_eventmax << 1); - kq_events = malloc (sizeof (struct kevent) * kq_eventmax); + ev_free (kqueue_events); + kqueue_eventmax = array_roundsize (struct kevent, kqueue_eventmax << 1); + kqueue_events = (struct kevent *)ev_malloc (sizeof (struct kevent) * kqueue_eventmax); } } -static void -kqueue_init (struct event_base *base) +static int +kqueue_init (EV_P_ int flags) { struct kevent ch, ev; /* Initalize the kernel queue */ - if ((kq_fd = kqueue ()) < 0) - return; + if ((backend_fd = kqueue ()) < 0) + return 0; + + fcntl (backend_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */ /* Check for Mac OS X kqueue bug. */ ch.ident = -1; @@ -142,24 +168,52 @@ kqueue_init (struct event_base *base) /* * If kqueue works, then kevent will succeed, and it will - * stick an error in events[0]. If kqueue is broken, then + * stick an error in ev. If kqueue is broken, then * kevent will fail. */ - if (kevent (kq_fd, &ch, 1, &ev, 1, 0) != 1 + if (kevent (backend_fd, &ch, 1, &ev, 1, 0) != 1 || ev.ident != -1 || ev.flags != EV_ERROR) { /* detected broken kqueue */ - close (kq_fd); - return; + close (backend_fd); + return 0; } - ev_method = EVMETHOD_KQUEUE; - method_fudge = 1e-3; /* needed to compensate for kevent returning early */ - method_modify = kq_modify; - method_poll = kq_poll; + backend_fudge = 1e-3; /* needed to compensate for kevent returning early */ + backend_modify = kqueue_modify; + backend_poll = kqueue_poll; + + kqueue_eventmax = 64; /* intiial number of events receivable per poll */ + kqueue_events = (struct kevent *)ev_malloc (sizeof (struct kevent) * kqueue_eventmax); + + kqueue_changes = 0; + kqueue_changemax = 0; + kqueue_changecnt = 0; + + return EVBACKEND_KQUEUE; +} + +static void +kqueue_destroy (EV_P) +{ + close (backend_fd); + + ev_free (kqueue_events); + ev_free (kqueue_changes); +} + +static void +kqueue_fork (EV_P) +{ + close (backend_fd); + + while ((backend_fd = kqueue ()) < 0) + syserr ("(libev) kqueue"); + + fcntl (backend_fd, F_SETFD, FD_CLOEXEC); - kq_eventmax = 64; /* intiial number of events receivable per poll */ - kq_events = malloc (sizeof (struct kevent) * kq_eventmax); + /* re-register interest in fds */ + fd_rearm_all (EV_A); }