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313 lines
8.7 KiB
313 lines
8.7 KiB
/**************************************************************************** |
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* net/net_sockets.c |
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* |
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* Copyright (C) 2007-2009, 2011-2012 Gregory Nutt. All rights reserved. |
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* Author: Gregory Nutt <gnutt@nuttx.org> |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* 3. Neither the name NuttX nor the names of its contributors may be |
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* used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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* POSSIBILITY OF SUCH DAMAGE. |
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* |
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****************************************************************************/ |
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/**************************************************************************** |
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* Included Files |
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****************************************************************************/ |
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#include <nuttx/config.h> |
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#ifdef CONFIG_NET |
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#include <string.h> |
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#include <semaphore.h> |
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#include <assert.h> |
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#include <sched.h> |
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#include <errno.h> |
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#include <debug.h> |
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#include <nuttx/net/uip/uip.h> |
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#include <nuttx/net/net.h> |
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#include <nuttx/kmalloc.h> |
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#include "net_internal.h" |
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/**************************************************************************** |
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* Definitions |
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****************************************************************************/ |
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/**************************************************************************** |
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* Public Types |
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****************************************************************************/ |
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/**************************************************************************** |
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* Private Variables |
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****************************************************************************/ |
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/**************************************************************************** |
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* Private Variables |
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****************************************************************************/ |
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/**************************************************************************** |
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* Private Functions |
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****************************************************************************/ |
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#if CONFIG_NSOCKET_DESCRIPTORS > 0 |
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static void _net_semtake(FAR struct socketlist *list) |
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{ |
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/* Take the semaphore (perhaps waiting) */ |
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while (uip_lockedwait(&list->sl_sem) != 0) |
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{ |
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/* The only case that an error should occr here is if |
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* the wait was awakened by a signal. |
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*/ |
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ASSERT(*get_errno_ptr() == EINTR); |
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} |
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} |
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# define _net_semgive(list) sem_post(&list->sl_sem) |
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#endif |
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/**************************************************************************** |
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* Public Functions |
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****************************************************************************/ |
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/* This is called from the initialization logic to configure the socket layer */ |
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void net_initialize(void) |
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{ |
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/* Initialize the uIP layer */ |
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uip_initialize(); |
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/* Initialize the socket layer */ |
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#if CONFIG_NSOCKET_DESCRIPTORS > 0 |
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netdev_seminit(); |
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#endif |
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/* Initialize the periodic ARP timer */ |
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arptimer_init(); |
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} |
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#if CONFIG_NSOCKET_DESCRIPTORS > 0 |
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/* Allocate a list of files for a new task */ |
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FAR struct socketlist *net_alloclist(void) |
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{ |
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FAR struct socketlist *list; |
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list = (FAR struct socketlist*)kzalloc(sizeof(struct socketlist)); |
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if (list) |
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{ |
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/* Start with a reference count of one */ |
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list->sl_crefs = 1; |
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/* Initialize the list access mutex */ |
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(void)sem_init(&list->sl_sem, 0, 1); |
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} |
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return list; |
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} |
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/* Increase the reference count on a file list */ |
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int net_addreflist(FAR struct socketlist *list) |
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{ |
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if (list) |
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{ |
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/* Increment the reference count on the list. |
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* NOTE: that we disable interrupts to do this |
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* (vs. taking the list semaphore). We do this |
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* because file cleanup operations often must be |
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* done from the IDLE task which cannot wait |
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* on semaphores. |
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*/ |
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register uip_lock_t flags = uip_lock(); |
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list->sl_crefs++; |
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uip_unlock(flags); |
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} |
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return OK; |
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} |
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/* Release a reference to the file list */ |
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int net_releaselist(FAR struct socketlist *list) |
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{ |
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int crefs; |
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int ndx; |
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if (list) |
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{ |
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/* Decrement the reference count on the list. |
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* NOTE: that we disable interrupts to do this |
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* (vs. taking the list semaphore). We do this |
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* because file cleanup operations often must be |
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* done from the IDLE task which cannot wait |
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* on semaphores. |
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*/ |
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uip_lock_t flags = uip_lock(); |
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crefs = --(list->sl_crefs); |
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uip_unlock(flags); |
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/* If the count decrements to zero, then there is no reference |
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* to the structure and it should be deallocated. Since there |
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* are references, it would be an error if any task still held |
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* a reference to the list's semaphore. |
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*/ |
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if (crefs <= 0) |
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{ |
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/* Close each open socket in the list |
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* REVISIT: psock_close() will attempt to use semaphores. |
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* If we actually are in the IDLE thread, then could this cause |
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* problems? Probably not, if the task has exited and crefs is |
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* zero, then there probably could not be a contender for the |
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* semaphore. |
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*/ |
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for (ndx = 0; ndx < CONFIG_NSOCKET_DESCRIPTORS; ndx++) |
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{ |
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FAR struct socket *psock = &list->sl_sockets[ndx]; |
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if (psock->s_crefs > 0) |
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{ |
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(void)psock_close(psock); |
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} |
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} |
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/* Destroy the semaphore and release the filelist */ |
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(void)sem_destroy(&list->sl_sem); |
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sched_free(list); |
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} |
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} |
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return OK; |
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} |
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int sockfd_allocate(int minsd) |
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{ |
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FAR struct socketlist *list; |
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int i; |
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/* Get the socket list for this task/thread */ |
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list = sched_getsockets(); |
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if (list) |
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{ |
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/* Search for a socket structure with no references */ |
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_net_semtake(list); |
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for (i = minsd; i < CONFIG_NSOCKET_DESCRIPTORS; i++) |
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{ |
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/* Are there references on this socket? */ |
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if (!list->sl_sockets[i].s_crefs) |
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{ |
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/* No take the reference and return the index + an offset |
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* as the socket descriptor. |
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*/ |
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memset(&list->sl_sockets[i], 0, sizeof(struct socket)); |
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list->sl_sockets[i].s_crefs = 1; |
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_net_semgive(list); |
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return i + __SOCKFD_OFFSET; |
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} |
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} |
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_net_semgive(list); |
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} |
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return ERROR; |
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} |
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void sock_release(FAR struct socket *psock) |
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{ |
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#if CONFIG_DEBUG |
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if (psock) |
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#endif |
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{ |
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/* Take the list semaphore so that there will be no accesses |
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* to this socket structure. |
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*/ |
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FAR struct socketlist *list = sched_getsockets(); |
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if (list) |
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{ |
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/* Decrement the count if there the socket will persist |
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* after this. |
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*/ |
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_net_semtake(list); |
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if (psock && psock->s_crefs > 1) |
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{ |
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psock->s_crefs--; |
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} |
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else |
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{ |
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/* The socket will not persist... reset it */ |
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memset(psock, 0, sizeof(struct socket)); |
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} |
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_net_semgive(list); |
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} |
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} |
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} |
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void sockfd_release(int sockfd) |
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{ |
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/* Get the socket structure for this sockfd */ |
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FAR struct socket *psock = sockfd_socket(sockfd); |
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/* Get the socket structure for this sockfd */ |
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if (psock) |
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{ |
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sock_release(psock); |
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} |
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} |
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FAR struct socket *sockfd_socket(int sockfd) |
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{ |
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FAR struct socketlist *list; |
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int ndx = sockfd - __SOCKFD_OFFSET; |
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if (ndx >=0 && ndx < CONFIG_NSOCKET_DESCRIPTORS) |
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{ |
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list = sched_getsockets(); |
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if (list) |
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{ |
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return &list->sl_sockets[ndx]; |
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} |
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} |
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return NULL; |
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} |
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#endif /* CONFIG_NSOCKET_DESCRIPTORS */ |
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#endif /* CONFIG_NET */
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