21041af8a7
As a policy, all internal OS implementations must use "detached" files which are valid in any context and do not depend on the validity of a file descriptor at any point in time. This commit converts the usage of file descriptors to detached files throughout the local socket implementation.
Squashed commit of the following:
net/local: Finish change to eliminate use of file descriptors.
net/local: A little more of the conversion.
net/local: Beginning of chnages to eliminate use of file descriptors in the local socket implementeation. poll() will be a problem.
156 lines
4.9 KiB
C
156 lines
4.9 KiB
C
/****************************************************************************
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* net/local/local_conn.c
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*
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* Copyright (C) 2015-2016 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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#if defined(CONFIG_NET) && defined(CONFIG_NET_LOCAL)
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#include <semaphore.h>
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#include <string.h>
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#include <assert.h>
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#include <errno.h>
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#include <queue.h>
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#include <debug.h>
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#include <nuttx/kmalloc.h>
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#include <nuttx/semaphore.h>
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#include "local/local.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: local_initialize
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*
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* Description:
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* Initialize the local, Unix domain connection structures. Called once
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* and only from the common network initialization logic.
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*
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****************************************************************************/
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void local_initialize(void)
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{
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#ifdef CONFIG_NET_LOCAL_STREAM
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dq_init(&g_local_listeners);
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#endif
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}
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/****************************************************************************
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* Name: local_alloc()
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*
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* Description:
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* Allocate a new, uninitialized Unix domain socket connection structure.
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* This is normally something done by the implementation of the socket()
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* API
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*
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****************************************************************************/
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FAR struct local_conn_s *local_alloc(void)
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{
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FAR struct local_conn_s *conn =
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(FAR struct local_conn_s *)kmm_zalloc(sizeof(struct local_conn_s));
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if (conn)
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{
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/* Initialize non-zero elements the new connection structure */
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conn->lc_infile.f_inode = NULL;
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conn->lc_outfile.f_inode = NULL;
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#ifdef CONFIG_NET_LOCAL_STREAM
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/* This semaphore is used for signaling and, hence, should not have
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* priority inheritance enabled.
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*/
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nxsem_init(&conn->lc_waitsem, 0, 0);
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nxsem_setprotocol(&conn->lc_waitsem, SEM_PRIO_NONE);
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#ifdef HAVE_LOCAL_POLL
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memset(conn->lc_accept_fds, 0, sizeof(conn->lc_accept_fds));
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#endif
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#endif
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}
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return conn;
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}
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/****************************************************************************
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* Name: local_free()
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*
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* Description:
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* Free a packet Unix domain connection structure that is no longer in use.
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* This should be done by the implementation of close().
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*
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****************************************************************************/
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void local_free(FAR struct local_conn_s *conn)
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{
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DEBUGASSERT(conn != NULL);
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/* Make sure that the read-only FIFO is closed */
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if (conn->lc_infile.f_inode != NULL)
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{
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file_close_detached(&conn->lc_infile);
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conn->lc_infile.f_inode = NULL;
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}
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/* Make sure that the write-only FIFO is closed */
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if (conn->lc_outfile.f_inode != NULL)
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{
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file_close_detached(&conn->lc_outfile);
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conn->lc_outfile.f_inode = NULL;
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}
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#ifdef CONFIG_NET_LOCAL_STREAM
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/* Destroy all FIFOs associted with the connection */
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local_release_fifos(conn);
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nxsem_destroy(&conn->lc_waitsem);
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#endif
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/* And free the connection structure */
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kmm_free(conn);
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}
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#endif /* CONFIG_NET && CONFIG_NET_LOCAL */
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