diff options
author | Gregory Nutt <gnutt@nuttx.org> | 2014-06-18 10:50:09 -0600 |
---|---|---|
committer | Gregory Nutt <gnutt@nuttx.org> | 2014-06-18 10:50:09 -0600 |
commit | 247e1587c3f749a3dd832b79a3251ae678f3d7b4 (patch) | |
tree | b8db4e5a404206bf00e66b9e81538aab5c1f51f2 /nuttx/net/udp/udp_poll.c | |
parent | 80555e2ee1a0558241c63690ec50d1b40216f1cf (diff) | |
download | px4-nuttx-247e1587c3f749a3dd832b79a3251ae678f3d7b4.tar.gz px4-nuttx-247e1587c3f749a3dd832b79a3251ae678f3d7b4.tar.bz2 px4-nuttx-247e1587c3f749a3dd832b79a3251ae678f3d7b4.zip |
Move UDP files from net/uip to net/udp
Diffstat (limited to 'nuttx/net/udp/udp_poll.c')
-rw-r--r-- | nuttx/net/udp/udp_poll.c | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/nuttx/net/udp/udp_poll.c b/nuttx/net/udp/udp_poll.c new file mode 100644 index 000000000..23b663250 --- /dev/null +++ b/nuttx/net/udp/udp_poll.c @@ -0,0 +1,126 @@ +/**************************************************************************** + * net/udp/udp_poll.c + * Poll for the availability of UDP TX data + * + * Copyright (C) 2007-2009 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <gnutt@nuttx.org> + * + * Adapted for NuttX from logic in uIP which also has a BSD-like license: + * + * Original author Adam Dunkels <adam@dunkels.com> + * Copyright () 2001-2003, Adam Dunkels. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote + * products derived from this software without specific prior + * written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS + * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY + * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE + * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, + * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING + * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> +#if defined(CONFIG_NET) && defined(CONFIG_NET_UDP) + +#include <debug.h> + +#include <nuttx/net/uip/uipopt.h> +#include <nuttx/net/uip/uip.h> +#include <nuttx/net/uip/uip-arch.h> + +#include "uip/uip_internal.h" + +/**************************************************************************** + * Pre-processor Definitions + ****************************************************************************/ + +/**************************************************************************** + * Public Variables + ****************************************************************************/ + +/**************************************************************************** + * Private Variables + ****************************************************************************/ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: uip_udppoll + * + * Description: + * Poll a UDP "connection" structure for availability of TX data + * + * Parameters: + * dev - The device driver structure to use in the send operation + * conn - The UDP "connection" to poll for TX data + * + * Return: + * None + * + * Assumptions: + * Called from the interrupt level or with interrupts disabled. + * + ****************************************************************************/ + +void uip_udppoll(FAR struct uip_driver_s *dev, FAR struct uip_udp_conn *conn) +{ + /* Verify that the UDP connection is valid */ + + if (conn->lport != 0) + { + /* Set-up for the application callback */ + + dev->d_appdata = &dev->d_buf[UIP_LLH_LEN + UIP_IPUDPH_LEN]; + dev->d_snddata = &dev->d_buf[UIP_LLH_LEN + UIP_IPUDPH_LEN]; + + dev->d_len = 0; + dev->d_sndlen = 0; + + /* Perform the application callback */ + + (void)uip_udpcallback(dev, conn, UIP_POLL); + + /* If the application has data to send, setup the UDP/IP header */ + + if (dev->d_sndlen > 0) + { + uip_udpsend(dev, conn); + return; + } + } + + /* Make sure that d_len is zero meaning that there is nothing to be sent */ + + dev->d_len = 0; +} + +#endif /* CONFIG_NET && CONFIG_NET_UDP */ |