initial import

1 files changed, 81 insertions, 0 deletions

diff --git a/sysdeps/unix/bsd/poll.c b/sysdeps/unix/bsd/poll.c
new file mode 100644
index 0000000000..4797ee04a1
--- /dev/null
+++ b/sysdeps/unix/bsd/poll.c
@@ -0,0 +1,81 @@
+/* Copyright (C) 1994 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#include <sys/poll.h>
+#include <sys/types.h>
+#include <errno.h>
+#include <string.h>
+#include <sys/time.h>
+
+/* Poll the file descriptors described by the NFDS structures starting at
+   FDS.  If TIMEOUT is nonzero and not -1, allow TIMEOUT milliseconds for
+   an event to occur; if TIMEOUT is -1, block until an event occurs.
+   Returns the number of file descriptors with events, zero if timed out,
+   or -1 for errors.  */
+
+int
+poll (fds, nfds, timeout)
+     struct pollfd *fds;
+     unsigned long int nfds;
+     int timeout;
+{
+  struct timeval tv;
+  fd_set rset, wset, xset;
+  struct pollfd *f;
+  int ready;
+  int maxfd = 0;
+
+  FD_ZERO (&rset);
+  FD_ZERO (&wset);
+  FD_ZERO (&xset);
+
+  for (f = fds; f < &fds[nfds]; ++f)
+    if (f->fd >= 0)
+      {
+	if (f->events & POLLIN)
+	  FD_SET (f->fd, &rset);
+	if (f->events & POLLOUT)
+	  FD_SET (f->fd, &wset);
+	if (f->events & POLLPRI)
+	  FD_SET (f->fd, &xset);
+	if (f->fd > maxfd && (f->events & (POLLIN|POLLOUT|POLLPRI)))
+	  maxfd = f->fd;
+      }
+
+  tv.tv_sec = timeout / 1000;
+  tv.tv_usec = (timeout + 999) / 1000;
+
+  ready = __select (maxfd + 1, &rset, &wset, &xset,
+		    timeout == -1 ? NULL : &tv);
+  if (ready > 0)
+    for (f = fds; f < &fds[nfds]; ++f)
+      {
+	f->revents = 0;
+	if (f->fd >= 0)
+	  {
+	    if (FD_ISSET (f->fd, &rset))
+	      f->revents |= POLLIN;
+	    if (FD_ISSET (f->fd, &wset))
+	      f->revents |= POLLOUT;
+	    if (FD_ISSET (f->fd, &xset))
+	      f->revents |= POLLPRI;
+	  }
+      }
+
+  return ready;
+}