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[software/libev.git] / ev_kqueue.c

diff --git a/ev_kqueue.c b/ev_kqueue.c
index e68654f244ceafa7d6173b3575546d4032cf4d37..7a34e9bdec7322373ed3d775ba866edf4b7d2802 100644 (file)
--- a/ev_kqueue.c
+++ b/ev_kqueue.c
@@ -1,31 +1,32 @@
-

 /*
 /*

- * Copyright 2007      Marc Alexander Lehmann <libev@schmorp.de>
- * Copyright 2000-2002 Niels Provos <provos@citi.umich.edu>
+ * libev kqueue backend
+ *
+ * Copyright (c) 2007 Marc Alexander Lehmann <libev@schmorp.de>

  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without

- * modification, are permitted provided that the following conditions
- * are met:
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.

  *
  *

- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. The name of the author may not be used to endorse or promote products
- *    derived from this software without specific prior written permission.
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.

  *
  *

- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
- * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

  */
 
 #include <sys/types.h>
  */
 
 #include <sys/types.h>


@@ -35,145 +36,158 @@
 #include <string.h>
 #include <errno.h>
 
 #include <string.h>
 #include <errno.h>
 

-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
 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;
 
 {
   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
 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
 }
 
 static void

-kqueue_poll (ev_tstamp timeout)
+kqueue_poll (EV_P_ ev_tstamp timeout)

 {
   int res, i;
   struct timespec ts;
 
 {
   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_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)
 
   if (res < 0)

-    return;
+    { 
+      if (errno != EINTR)
+        syserr ("(libev) kevent");
+
+      return;
+    } 

 
   for (i = 0; i < res; ++i)
     {
 
   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))

         {
         {

-          /* 
-           * Error messages that can happen, when a delete fails.
-           *   EBADF happens when the file discriptor has been
-           *   closed,
-           *   ENOENT when the file discriptor 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);
+         int err = kqueue_events [i].data;
+
+          /* 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
         }
       else

-        event (
-          events [i].ident,
-          events [i].filter == EVFILT_READ ? EV_READ
-          : events [i].filter == EVFILT_WRITE ? EV_WRITE
+        fd_event (
+          EV_A_
+          fd,
+          kqueue_events [i].filter == EVFILT_READ ? EV_READ
+          : kqueue_events [i].filter == EVFILT_WRITE ? EV_WRITE

           : 0
         );
     }
 
           : 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 */
   /* Initalize the kernel queue */

-  if ((kq_fd = kqueue ()) == -1)
-    {
-      free (kqueueop);
-      return;
-    }
+  if ((backend_fd = kqueue ()) < 0)
+    return 0;

 
 

-  /* Initalize fields */
-  kq_changes = malloc (NEVENT * sizeof (struct kevent));
-  if (!kq_changes)
-    return;
+  fcntl (backend_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */

 
 

-  events = malloc (NEVENT * sizeof (struct kevent));
-  if (!events)
-    {
-      free (kq_changes);
-      return;
-    }
+  /* fudge *might* be zero from the documentation, but bsd docs are notoriously wrong */
+  backend_fudge  = 1e-3; /* needed to compensate for kevent returning early */
+  backend_modify = kqueue_modify;
+  backend_poll   = kqueue_poll;

 
 

-  /* Check for Mac OS X kqueue bug. */
-  kq_changes [0].ident  = -1;
-  kq_changes [0].filter = EVFILT_READ;
-  kq_changes [0].flags  = EV_ADD;
-  /* 
-   * If kqueue works, then kevent will succeed, and it will
-   * stick an error in events[0]. If kqueue is broken, then
-   * kevent will fail.
-   */
-  if (kevent (kq_fd, kq_changes, 1, kq_events, NEVENT, NULL) != 1
-      || kq_events[0].ident != -1
-      || kq_events[0].flags != EV_ERROR)
-    {
-      /* detected broken kqueue */
-      free (kq_changes);
-      free (kq_events);
-      close (kq_fd);
-      return;
-    }
+  kqueue_eventmax = 64; /* initial 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");

 
 

-  ev_method     = EVMETHOD_KQUEUE;
-  method_fudge  = 1e-3; /* needed to compensate for kevent returning early */
-  method_modify = kq_modify;
-  method_poll   = kq_poll;
+  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);

 }
 
 }