include embedding doc in main doc

[software/libev.git] / ev_kqueue.c

diff --git a/ev_kqueue.c b/ev_kqueue.c
index f23967f7391d8c6d9a2beb88810fcf94aabac961..41a5dbebf319c752b2dba28546635b285bdb116c 100644 (file)
--- a/ev_kqueue.c
+++ b/ev_kqueue.c
@@ -39,14 +39,10 @@ kqueue_change (EV_P_ int fd, int filter, int flags, int fflags)
 {
   struct kevent *ke;
 
 {
   struct kevent *ke;
 

-  array_needsize (struct kevent, kqueue_changes, kqueue_changemax, ++kqueue_changecnt, );
-
-  ke = &kqueue_changes [kqueue_changecnt - 1];
-  memset (ke, 0, sizeof (struct kevent));
-  ke->ident  = fd;
-  ke->filter = filter;
-  ke->flags  = flags;
-  ke->fflags = fflags;
+  ++kqueue_changecnt;
+  array_needsize (struct kevent, kqueue_changes, kqueue_changemax, kqueue_changecnt, EMPTY2);
+
+  EV_SET (&kqueue_changes [kqueue_changecnt - 1], fd, filter, flags, fflags, 0, 0);

 }
 
 #ifndef NOTE_EOF
 }
 
 #ifndef NOTE_EOF


@@ -56,21 +52,23 @@ kqueue_change (EV_P_ int fd, int filter, int flags, int fflags)
 static void
 kqueue_modify (EV_P_ int fd, int oev, int nev)
 {
 static void
 kqueue_modify (EV_P_ int fd, int oev, int nev)
 {

-  if ((oev ^ nev) & 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 ^ nev) & 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


@@ -79,9 +77,17 @@ 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 (kqueue_fd, kqueue_changes, kqueue_changecnt, kqueue_events, kqueue_eventmax, &ts);
+  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)
   kqueue_changecnt = 0;
 
   if (res < 0)


@@ -94,27 +100,42 @@ kqueue_poll (EV_P_ ev_tstamp timeout)
 
   for (i = 0; i < res; ++i)
     {
 
   for (i = 0; i < res; ++i)
     {

-      if (kqueue_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,
            *   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 :-\
            *   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 (kqueue_events [i].data == EBADF)
-            fd_kill (EV_A_ kqueue_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 (
           EV_A_
         }
       else
         fd_event (
           EV_A_

-          kqueue_events [i].ident,
+          fd,

           kqueue_events [i].filter == EVFILT_READ ? EV_READ
           : kqueue_events [i].filter == EVFILT_WRITE ? EV_WRITE
           : 0
           kqueue_events [i].filter == EVFILT_READ ? EV_READ
           : kqueue_events [i].filter == EVFILT_WRITE ? EV_WRITE
           : 0


@@ -124,8 +145,8 @@ kqueue_poll (EV_P_ ev_tstamp timeout)
   if (expect_false (res == kqueue_eventmax))
     {
       ev_free (kqueue_events);
   if (expect_false (res == kqueue_eventmax))
     {
       ev_free (kqueue_events);

-      kqueue_eventmax = array_roundsize (kqueue_events, kqueue_eventmax << 1);
-      kqueue_events = ev_malloc (sizeof (struct kevent) * kqueue_eventmax);
+      kqueue_eventmax = array_roundsize (struct kevent, kqueue_eventmax << 1);
+      kqueue_events = (struct kevent *)ev_malloc (sizeof (struct kevent) * kqueue_eventmax);

     }
 }
 
     }
 }
 


@@ -135,10 +156,10 @@ kqueue_init (EV_P_ int flags)
   struct kevent ch, ev;
 
   /* Initalize the kernel queue */
   struct kevent ch, ev;
 
   /* Initalize the kernel queue */

-  if ((kqueue_fd = kqueue ()) < 0)
+  if ((backend_fd = kqueue ()) < 0)

     return 0;
 
     return 0;
 

-  fcntl (kqueue_fd, F_SETFD, FD_CLOEXEC); /* not sure if necessary, hopefully doesn't hurt */
+  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;
 
   /* Check for Mac OS X kqueue bug. */
   ch.ident  = -1;


@@ -150,33 +171,33 @@ kqueue_init (EV_P_ int flags)
    * stick an error in ev. If kqueue is broken, then
    * kevent will fail.
    */
    * stick an error in ev. If kqueue is broken, then
    * kevent will fail.
    */

-  if (kevent (kqueue_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 */
       || ev.ident != -1
       || ev.flags != EV_ERROR)
     {
       /* detected broken kqueue */

-      close (kqueue_fd);
+      close (backend_fd);

       return 0;
     }
 
       return 0;
     }
 

-  method_fudge  = 1e-3; /* needed to compensate for kevent returning early */
-  method_modify = kqueue_modify;
-  method_poll   = kqueue_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_eventmax = 64; /* intiial number of events receivable per poll */

-  kqueue_events = ev_malloc (sizeof (struct kevent) * kqueue_eventmax);
+  kqueue_events = (struct kevent *)ev_malloc (sizeof (struct kevent) * kqueue_eventmax);

 
   kqueue_changes   = 0;
   kqueue_changemax = 0;
   kqueue_changecnt = 0;
 
 
   kqueue_changes   = 0;
   kqueue_changemax = 0;
   kqueue_changecnt = 0;
 

-  return EVMETHOD_KQUEUE;
+  return EVBACKEND_KQUEUE;

 }
 
 static void
 kqueue_destroy (EV_P)
 {
 }
 
 static void
 kqueue_destroy (EV_P)
 {

-  close (kqueue_fd);
+  close (backend_fd);

 
   ev_free (kqueue_events);
   ev_free (kqueue_changes);
 
   ev_free (kqueue_events);
   ev_free (kqueue_changes);


@@ -185,12 +206,12 @@ kqueue_destroy (EV_P)
 static void
 kqueue_fork (EV_P)
 {
 static void
 kqueue_fork (EV_P)
 {

-  close (kqueue_fd);
+  close (backend_fd);

 
 

-  while ((kqueue_fd = kqueue ()) < 0)
+  while ((backend_fd = kqueue ()) < 0)

     syserr ("(libev) kqueue");
 
     syserr ("(libev) kqueue");
 

-  fcntl (kqueue_fd, F_SETFD, FD_CLOEXEC);
+  fcntl (backend_fd, F_SETFD, FD_CLOEXEC);

 
   /* re-register interest in fds */
   fd_rearm_all (EV_A);
 
   /* re-register interest in fds */
   fd_rearm_all (EV_A);