LUA: hide EINTR from scripts and remove the timeout feature

Timeout makes it too easy to write crappy code.
It's also much easier to handle EINTR without timeout.

This fixes a minor bug: revents was undefined if poll() failed.
(cherry picked from commit 314c242ab041d515c1b2f1a82ee1a3fe4fe715a5)

modules/misc/lua/libs/net.c

@@ -196,7 +196,6 @@ static int vlclua_net_recv( lua_State *L )
 static int vlclua_net_poll( lua_State *L )
 {
     luaL_checktype( L, 1, LUA_TTABLE );
-    double f_timeout = luaL_optnumber( L, 2, -1. );
 
     int i_fds = 0;
     lua_pushnil( L );
@@ -218,7 +217,11 @@ static int vlclua_net_poll( lua_State *L )
         i++;
     }
 
-    int i_ret = poll( p_fds, i_fds, f_timeout < 0. ? -1 : (int)(f_timeout*1000) );
+    int i_ret;
+    do
+        i_ret = poll( p_fds, i_fds, -1 );
+    while( i_ret == -1 );
+
     for( i = 0; i < i_fds; i++ )
     {
         lua_pushinteger( L, p_fds[i].fd );

share/lua/README.txt

@@ -195,7 +195,7 @@ net.connect_tcp( host, port ): open a connection to the given host:port (TCP).
 net.close( fd ): Close file descriptor.
 net.send( fd, string, [length] ): Send data on fd.
 net.recv( fd, [max length] ): Receive data from fd.
-net.poll( { fd = events }, [timeout in seconds] ): Implement poll function.
+net.poll( { fd = events } ): Implement poll function.
   Returns the numbers of file descriptors with a non 0 revent. The function
   modifies the input table to { fd = revents }. See "man poll".
 net.POLLIN/POLLPRI/POLLOUT/POLLRDHUP/POLLERR/POLLHUP/POLLNVAL: poll event flags

share/lua/intf/modules/host.lua

@@ -244,7 +244,7 @@ function host()
             end
         end
 
-        local ret = vlc.net.poll( pollfds, timeout or -1 )
+        local ret = vlc.net.poll( pollfds )
         local wclients = {}
         local rclients = {}
         if ret > 0 then