From 5d303ec17efc511d8cfe0919a790b44e24a8aad9 Mon Sep 17 00:00:00 2001 From: patacongo Date: Sat, 1 Sep 2007 18:06:15 +0000 Subject: Added support for socket descriptors git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@318 42af7a65-404d-4744-a932-0658087f49c3 --- nuttx/net/net_sockets.c | 171 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 171 insertions(+) create mode 100644 nuttx/net/net_sockets.c (limited to 'nuttx/net/net_sockets.c') diff --git a/nuttx/net/net_sockets.c b/nuttx/net/net_sockets.c new file mode 100644 index 000000000..fb4927e72 --- /dev/null +++ b/nuttx/net/net_sockets.c @@ -0,0 +1,171 @@ +/**************************************************************************** + * net_sockets.c + * + * Copyright (C) 2007 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt + * + * 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 Gregory Nutt 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 +#include +#include +#include +#include +#include +#include +#include +#include "net_internal.h" + +/**************************************************************************** + * Definitions + ****************************************************************************/ + +/**************************************************************************** + * Public Types + ****************************************************************************/ + +/**************************************************************************** + * Private Variables + ****************************************************************************/ + +/**************************************************************************** + * Private Variables + ****************************************************************************/ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +static void _net_semtake(FAR struct socketlist *list) +{ + /* Take the semaphore (perhaps waiting) */ + + while (sem_wait(&list->sl_sem) != 0) + { + /* The only case that an error should occr here is if + * the wait was awakened by a signal. + */ + + ASSERT(*get_errno_ptr() == EINTR); + } +} + +#define _net_semgive(list) sem_post(&list->sl_sem) + +/**************************************************************************** + * Pulblic Functions + ****************************************************************************/ + +/* This is called from the initialization logic to configure the socket layer */ + +void net_initialize(void) +{ +} + +/* Allocate a list of files for a new task */ + +FAR struct socketlist *net_alloclist(void) +{ + FAR struct socketlist *list; + list = (FAR struct socketlist*)kzmalloc(sizeof(struct socketlist)); + if (list) + { + /* Start with a reference count of one */ + + list->sl_crefs = 1; + + /* Initialize the list access mutex */ + + (void)sem_init(&list->sl_sem, 0, 1); + } + return list; +} + +/* Increase the reference count on a file list */ + +int net_addreflist(FAR struct socketlist *list) +{ + if (list) + { + /* Increment the reference count on the list. + * NOTE: that we disable interrupts to do this + * (vs. taking the list semaphore). We do this + * because file cleanup operations often must be + * done from the IDLE task which cannot wait + * on semaphores. + */ + + register irqstate_t flags = irqsave(); + list->sl_crefs++; + irqrestore(flags); + } + return OK; +} + +/* Release a reference to the file list */ + +int net_releaselist(FAR struct socketlist *list) +{ + int crefs; + if (list) + { + /* Decrement the reference count on the list. + * NOTE: that we disable interrupts to do this + * (vs. taking the list semaphore). We do this + * because file cleanup operations often must be + * done from the IDLE task which cannot wait + * on semaphores. + */ + + irqstate_t flags = irqsave(); + crefs = --(list->sl_crefs); + irqrestore(flags); + + /* If the count decrements to zero, then there is no reference + * to the structure and it should be deallocated. Since there + * are references, it would be an error if any task still held + * a reference to the list's semaphore. + */ + + if (crefs <= 0) + { + /* Destroy the semaphore and release the filelist */ + + (void)sem_destroy(&list->sl_sem); + sched_free(list); + } + } + return OK; +} + -- cgit v1.2.3