initial roguh cut that doesn't immediately barf

1 files changed, 89 insertions, 0 deletions

diff --git a/ev_epoll.c b/ev_epoll.c
new file mode 100644
index 0000000..42e4a8b
--- /dev/null
+++ b/ev_epoll.c
@@ -0,0 +1,89 @@
+#include <sys/epoll.h>
+
+static int epoll_fd = -1;
+
+static void
+epoll_reify_fd (int fd)
+{
+  ANFD *anfd = anfds + fd;
+  struct ev_io *w;
+
+  int wev = 0;
+
+  for (w = anfd->head; w; w = w->next)
+    wev |= w->events;
+
+  if (anfd->wev != wev)
+    {
+      int mode = wev ? anfd->wev ? EPOLL_CTL_MOD : EPOLL_CTL_ADD : EPOLL_CTL_DEL;
+      struct epoll_event ev;
+      ev.events = wev;
+      ev.data.fd = fd;
+      fprintf (stderr, "reify %d,%d,%d m%d (r=%d)\n", fd, anfd->wev, wev, mode,//D
+      epoll_ctl (epoll_fd, mode, fd, &ev)
+      );//D
+      anfd->wev = wev;
+    }
+}
+
+void epoll_postfork_child (void)
+{
+  int i;
+
+  epoll_fd = epoll_create (256);
+
+  for (i = 0; i < anfdmax; ++i)
+    epoll_reify_fd (i);
+}
+
+static void epoll_reify (void)
+{
+  int i;
+  for (i = 0; i < fdchangecnt; ++i)
+    epoll_reify_fd (fdchanges [i]);
+}
+
+static struct epoll_event *events;
+static int eventmax;
+
+static void epoll_poll (ev_tstamp timeout)
+{
+  int eventcnt = epoll_wait (epoll_fd, events, eventmax, ceil (timeout * 1000.));
+  int i;
+
+  if (eventcnt < 0)
+    return;
+
+  for (i = 0; i < eventcnt; ++i)
+    fd_event (
+      events [i].data.fd,
+      (events [i].events & (EPOLLOUT | EPOLLERR | EPOLLHUP | EPOLLPRI) ? EV_WRITE : 0)
+      | (events [i].events & (EPOLLIN | EPOLLERR | EPOLLHUP)           ? EV_READ  : 0)
+    );
+
+  /* if the receive array was full, increase its size */
+  if (eventcnt == eventmax)
+    {
+      free (events);
+      eventmax += eventmax >> 1;
+      events = malloc (sizeof (struct epoll_event) * eventmax);
+    }
+}
+
+int epoll_init (int flags)
+{
+  epoll_fd = epoll_create (256);
+
+  if (epoll_fd < 0)
+    return 0;
+
+  ev_method = EVMETHOD_EPOLL;
+  method_fudge = 1e-3; /* needed to compensate fro epoll returning early */
+  method_reify = epoll_reify;
+  method_poll  = epoll_poll;
+
+  eventmax = 64; /* intiial number of events receivable per poll */
+  events = malloc (sizeof (struct epoll_event) * eventmax);
+
+  return 1;
+}