diff options
Diffstat (limited to 'nuttx/net/net_sockets.c')
-rw-r--r-- | nuttx/net/net_sockets.c | 313 |
1 files changed, 313 insertions, 0 deletions
diff --git a/nuttx/net/net_sockets.c b/nuttx/net/net_sockets.c new file mode 100644 index 000000000..81e48c121 --- /dev/null +++ b/nuttx/net/net_sockets.c @@ -0,0 +1,313 @@ +/**************************************************************************** + * net/net_sockets.c + * + * Copyright (C) 2007-2009, 2011-2012 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> +#ifdef CONFIG_NET + +#include <string.h> +#include <semaphore.h> +#include <assert.h> +#include <sched.h> +#include <errno.h> +#include <debug.h> + +#include <nuttx/net/uip/uip.h> +#include <nuttx/net/net.h> +#include <nuttx/kmalloc.h> + +#include "net_internal.h" + +/**************************************************************************** + * Definitions + ****************************************************************************/ + +/**************************************************************************** + * Public Types + ****************************************************************************/ + +/**************************************************************************** + * Private Variables + ****************************************************************************/ + +/**************************************************************************** + * Private Variables + ****************************************************************************/ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +#if CONFIG_NSOCKET_DESCRIPTORS > 0 +static void _net_semtake(FAR struct socketlist *list) +{ + /* Take the semaphore (perhaps waiting) */ + + while (uip_lockedwait(&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) +#endif + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/* This is called from the initialization logic to configure the socket layer */ + +void net_initialize(void) +{ + /* Initialize the uIP layer */ + + uip_initialize(); + + /* Initialize the socket layer */ + +#if CONFIG_NSOCKET_DESCRIPTORS > 0 + netdev_seminit(); +#endif + + /* Initialize the periodic ARP timer */ + + arptimer_init(); +} + +#if CONFIG_NSOCKET_DESCRIPTORS > 0 + +/* Allocate a list of files for a new task */ + +FAR struct socketlist *net_alloclist(void) +{ + FAR struct socketlist *list; + list = (FAR struct socketlist*)kzalloc(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 uip_lock_t flags = uip_lock(); + list->sl_crefs++; + uip_unlock(flags); + } + return OK; +} + +/* Release a reference to the file list */ + +int net_releaselist(FAR struct socketlist *list) +{ + int crefs; + int ndx; + + 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. + */ + + uip_lock_t flags = uip_lock(); + crefs = --(list->sl_crefs); + uip_unlock(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) + { + /* Close each open socket in the list + * REVISIT: psock_close() will attempt to use semaphores. + * If we actually are in the IDLE thread, then could this cause + * problems? Probably not, if the task has exited and crefs is + * zero, then there probably could not be a contender for the + * semaphore. + */ + + for (ndx = 0; ndx < CONFIG_NSOCKET_DESCRIPTORS; ndx++) + { + FAR struct socket *psock = &list->sl_sockets[ndx]; + if (psock->s_crefs > 0) + { + (void)psock_close(psock); + } + } + + /* Destroy the semaphore and release the filelist */ + + (void)sem_destroy(&list->sl_sem); + sched_free(list); + } + } + return OK; +} + +int sockfd_allocate(int minsd) +{ + FAR struct socketlist *list; + int i; + + /* Get the socket list for this task/thread */ + + list = sched_getsockets(); + if (list) + { + /* Search for a socket structure with no references */ + + _net_semtake(list); + for (i = minsd; i < CONFIG_NSOCKET_DESCRIPTORS; i++) + { + /* Are there references on this socket? */ + + if (!list->sl_sockets[i].s_crefs) + { + /* No take the reference and return the index + an offset + * as the socket descriptor. + */ + + memset(&list->sl_sockets[i], 0, sizeof(struct socket)); + list->sl_sockets[i].s_crefs = 1; + _net_semgive(list); + return i + __SOCKFD_OFFSET; + } + } + _net_semgive(list); + } + + return ERROR; +} + +void sock_release(FAR struct socket *psock) +{ +#if CONFIG_DEBUG + if (psock) +#endif + { + /* Take the list semaphore so that there will be no accesses + * to this socket structure. + */ + + FAR struct socketlist *list = sched_getsockets(); + if (list) + { + /* Decrement the count if there the socket will persist + * after this. + */ + + _net_semtake(list); + if (psock && psock->s_crefs > 1) + { + psock->s_crefs--; + } + else + { + /* The socket will not persist... reset it */ + + memset(psock, 0, sizeof(struct socket)); + } + _net_semgive(list); + } + } +} + +void sockfd_release(int sockfd) +{ + /* Get the socket structure for this sockfd */ + + FAR struct socket *psock = sockfd_socket(sockfd); + + /* Get the socket structure for this sockfd */ + + if (psock) + { + sock_release(psock); + } +} + +FAR struct socket *sockfd_socket(int sockfd) +{ + FAR struct socketlist *list; + int ndx = sockfd - __SOCKFD_OFFSET; + + if (ndx >=0 && ndx < CONFIG_NSOCKET_DESCRIPTORS) + { + list = sched_getsockets(); + if (list) + { + return &list->sl_sockets[ndx]; + } + } + return NULL; +} + +#endif /* CONFIG_NSOCKET_DESCRIPTORS */ +#endif /* CONFIG_NET */ |