poll() replacement

include/vlc_network.h

@@ -2,6 +2,7 @@
  * vlc_network.h: interface to communicate with network plug-ins
  *****************************************************************************
  * Copyright (C) 2002-2005 the VideoLAN team
+ * Copyright © 2006-2007 Rémi Denis-Courmont
  * $Id$
  *
  * Authors: Christophe Massiot <massiot@via.ecp.fr>
@@ -140,6 +141,27 @@ VLC_EXPORT( int, __net_vaPrintf, ( vlc_object_t *p_this, int fd, const v_socket_
 int inet_pton(int af, const char *src, void *dst);
 #endif
 
+#ifndef HAVE_POLL
+enum
+{
+    POLLIN=1,
+    POLLOUT=2,
+    POLLPRI=4
+    POLLERR=8,  // unsupported stub
+    POLLHUP=16, // unsupported stub
+    POLLNVAL=32 // unsupported stub
+};
+
+struct pollfd
+{
+	int fd;
+	int events;
+	int revents;
+};
+
+int poll (struct pollfd *fds, unsigned nfds, int timeout);
+#endif
+
 
 /*****************************************************************************
  * net_StopRecv/Send

src/Makefile.am

@@ -275,6 +275,7 @@ SOURCES_libvlc_common = \
 	network/httpd.c \
 	network/rootwrap.c \
 	network/tls.c \
+	network/poll.c \
 	text/charset.c \
 	text/strings.c \
 	text/unicode.c \

src/network/poll.c

+/*****************************************************************************
+ * poll.c: I/O event multiplexing
+ *****************************************************************************
+ * Copyright © 2007 Rémi Denis-Courmont
+ * $Id$
+ *
+ * Author: Rémi Denis-Courmont
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
+ *****************************************************************************/
+
+#include <vlc/vlc.h>
+
+#ifndef HAVE_POLL
+#include <string.h>
+#include <stdlib.h>
+#include <vlc_network.h>
+
+int poll (struct pollfd *fds, unsigned nfds, int timeout)
+{
+    fd_set rdset, wrset, exset;
+    struct timeval tv = { 0, 0 };
+    int val = -1;
+
+
+    FD_ZERO (&rdset);
+    FD_ZERO (&wrset);
+    FD_ZERO (&exset);
+    for (unsigned i = 0; i < nfds; i++)
+    {
+        int fd = fds[i].fd;
+        if (val < fd)
+            val = fd;
+
+        /* I assume the OS has a solution select overflow if it does not have
+         * poll(). If it did not, we are screwed anyway. */
+        if (fds[i].events & POLLIN)
+            FD_SET (fd, &rdset);
+        if (fds[i].events & POLLOUT)
+            FD_SET (fd, &wrset);
+        if (fds[i].events & POLLPRI)
+            FD_SET (fd, &exset);
+    }
+
+    if (timeout >= 0)
+    {
+        div_t d = div (timeout, 1000);
+        tv.tv_sec = d.quot;
+        tv.tv_usec = d.rem * 1000;
+    }
+
+    val = select (val + 1, &rdset, &wrset, NULL,
+                  (timeout >= 0) ? &tv : NULL);
+    if (val == -1)
+        return -1;
+
+    for (unsigned i = 0; i < nfds; i++)
+    {
+        int fd = fds[i].fd;
+        fds[i].revents = (FD_ISSET (fds[i].fd, &rdset) ? POLLIN : 0)
+                       | (FD_ISSET (fds[i].fd, &wrset) ? POLLOUT : 0)
+                       | (FD_ISSET (fds[i].fd, &exset) ? POLLPRI : 0);
+    }
+    return val;
+}
+#endif /* !HAVE_POLL */