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px4-firmware/nuttx/net/uip/uip_callback.c

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/****************************************************************************
* net/uip/uip_callback.c
*
* Copyright (C) 2008-2009 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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
* COPYRIGHT OWNER OR CONTRIBUTORS 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)
#include <stdint.h>
#include <string.h>
#include <debug.h>
#include <nuttx/net/uip/uipopt.h>
#include <nuttx/net/uip/uip.h>
#include <nuttx/net/uip/uip-arch.h>
#include "uip_internal.h"
/****************************************************************************
* Private Data
****************************************************************************/
static struct uip_callback_s g_cbprealloc[CONFIG_NET_NACTIVESOCKETS];
static FAR struct uip_callback_s *g_cbfreelist = NULL;
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Function: uip_callbackinit
*
* Description:
* Configure the pre-allocated callaback structures into a free list.
* This is called internally as part of uIP initialization and should not
* be accessed from the application or socket layer.
*
* Assumptions:
* This function is called with interrupts disabled.
*
****************************************************************************/
void uip_callbackinit(void)
{
int i;
for (i = 0; i < CONFIG_NET_NACTIVESOCKETS; i++)
{
g_cbprealloc[i].flink = g_cbfreelist;
g_cbfreelist = &g_cbprealloc[i];
}
}
/****************************************************************************
* Function: uip_callbackalloc
*
* Description:
* Allocate a callback container from the free list.
* This is called internally as part of uIP initialization and should not
* be accessed from the application or socket layer.
*
* Assumptions:
* This function is called with interrupts disabled.
*
****************************************************************************/
FAR struct uip_callback_s *uip_callbackalloc(FAR struct uip_callback_s **list)
{
struct uip_callback_s *ret;
uip_lock_t save;
/* Check the head of the free list */
save = uip_lock();
ret = g_cbfreelist;
if (ret)
{
/* Remove the next instance from the head of the free list */
g_cbfreelist = ret->flink;
memset(ret, 0, sizeof(struct uip_callback_s));
/* Add the newly allocated instance to the head of the specified list */
if (list)
{
ret->flink = *list;
*list = ret;
}
else
{
ret->flink = NULL;
}
}
#ifdef CONFIG_DEBUG
else
{
nlldbg("Failed to allocate callback\n");
}
#endif
uip_unlock(save);
return ret;
}
/****************************************************************************
* Function: uip_callbackfree
*
* Description:
* Return a callback container to the free list.
* This is called internally as part of uIP initialization and should not
* be accessed from the application or socket layer.
*
* Assumptions:
* This function is called with interrupts disabled.
*
****************************************************************************/
void uip_callbackfree(FAR struct uip_callback_s *cb, FAR struct uip_callback_s **list)
{
FAR struct uip_callback_s *prev;
FAR struct uip_callback_s *curr;
uip_lock_t save;
if (cb)
{
/* Find the callback structure in the connection's list */
save = uip_lock();
if (list)
{
for (prev = NULL, curr = *list;
curr && curr != cb;
prev = curr, curr = curr->flink);
/* Remove the structure from the connection's list */
if (curr)
{
if (prev)
{
prev->flink = cb->flink;
}
else
{
*list = cb->flink;
}
}
}
/* Put the structure into the free list */
cb->flink = g_cbfreelist;
g_cbfreelist = cb;
uip_unlock(save);
}
}
/****************************************************************************
* Function: uip_callbackexecute
*
* Description:
* Execute a list of callbacks.
* This is called internally as part of uIP initialization and should not
* be accessed from the application or socket layer.
*
* Assumptions:
* This function is called with interrupts disabled.
*
****************************************************************************/
uint16_t uip_callbackexecute(FAR struct uip_driver_s *dev, void *pvconn,
uint16_t flags, FAR struct uip_callback_s *list)
{
FAR struct uip_callback_s *next;
uip_lock_t save;
/* Loop for each callback in the list and while there are still events
* set in the flags set.
*/
save = uip_lock();
while (list && flags)
{
/* Save the pointer to the next callback in the lists. This is done
* because the callback action might delete the entry pointed to by
* list.
*/
next = list->flink;
/* Check if this callback handles any of the events in the flag set */
if (list->event && (flags & list->flags) != 0)
{
/* Yes.. perform the callback. Actions perform by the callback
* may delete the current list entry or add a new list entry to
* beginning of the list (which will be ignored on this pass)
*/
nllvdbg("Call event=%p with flags=%04x\n", list->event, flags);
flags = list->event(dev, pvconn, list->priv, flags);
}
/* Set up for the next time through the loop */
list = next;
}
uip_unlock(save);
return flags;
}
#endif /* CONFIG_NET */
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