250 lines
7.4 KiB
C
250 lines
7.4 KiB
C
/****************************************************************************
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* net/socket/socket.c
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*
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* Copyright (C) 2007-2009, 2012, 2014-2015 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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#include <sys/socket.h>
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#include <errno.h>
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#include <assert.h>
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#include <debug.h>
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#include "usrsock/usrsock.h"
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#include "socket/socket.h"
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#ifdef CONFIG_NET
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: psock_socket
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*
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* Description:
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* socket() creates an endpoint for communication and returns a socket
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* structure.
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*
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* NOTE: This function does not set the reference count on the socket
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* structure. This down by the socket() front end when socket structure
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* was allocated. Internal OS users of psock_socket() must set the s_crefs
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* field to one if psock_socket() returns success.
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*
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* Input Parameters:
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* domain (see sys/socket.h)
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* type (see sys/socket.h)
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* protocol (see sys/socket.h)
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* psock A pointer to a user allocated socket structure to be initialized.
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*
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* Returned Value:
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* Returns zero (OK) on success. On failure, it returns a negated errno
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* value to indicate the nature of the error:
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*
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* EACCES
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* Permission to create a socket of the specified type and/or protocol
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* is denied.
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* EAFNOSUPPORT
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* The implementation does not support the specified address family.
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* EINVAL
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* Unknown protocol, or protocol family not available.
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* EMFILE
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* Process file table overflow.
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* ENFILE
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* The system limit on the total number of open files has been reached.
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* ENOBUFS or ENOMEM
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* Insufficient memory is available. The socket cannot be created until
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* sufficient resources are freed.
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* EPROTONOSUPPORT
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* The protocol type or the specified protocol is not supported within
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* this domain.
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*
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****************************************************************************/
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int psock_socket(int domain, int type, int protocol, FAR struct socket *psock)
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{
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FAR const struct sock_intf_s *sockif = NULL;
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int ret;
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/* Initialize the socket structure */
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psock->s_domain = domain;
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psock->s_type = type;
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psock->s_conn = NULL;
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#if defined(CONFIG_NET_TCP_WRITE_BUFFERS) || defined(CONFIG_NET_UDP_WRITE_BUFFERS)
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psock->s_sndcb = NULL;
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#endif
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#ifdef CONFIG_NET_USRSOCK
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if (domain != PF_LOCAL && domain != PF_UNSPEC)
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{
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/* Handle special setup for USRSOCK sockets (user-space networking
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* stack).
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*/
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ret = g_usrsock_sockif.si_setup(psock, protocol);
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if (ret == -ENETDOWN)
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{
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/* -ENETDOWN means that USRSOCK daemon is not running. Attempt to
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* open socket with kernel networking stack.
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*/
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}
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else
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{
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psock->s_sockif = &g_usrsock_sockif;
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if (ret < 0)
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{
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return ret;
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}
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return ret;
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}
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}
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#endif /* CONFIG_NET_USRSOCK */
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/* Get the socket interface */
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sockif = net_sockif(domain, type, protocol);
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if (sockif == NULL)
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{
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nerr("ERROR: socket address family unsupported: %d\n", domain);
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return -EAFNOSUPPORT;
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}
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/* The remaining of the socket initialization depends on the address
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* family.
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*/
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DEBUGASSERT(sockif->si_setup != NULL);
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psock->s_sockif = sockif;
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ret = sockif->si_setup(psock, protocol);
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if (ret < 0)
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{
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nerr("ERROR: socket si_setup() failed: %d\n", ret);
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return ret;
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}
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return OK;
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}
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/****************************************************************************
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* Name: socket
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*
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* Description:
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* socket() creates an endpoint for communication and returns a descriptor.
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*
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* Parameters:
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* domain (see sys/socket.h)
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* type (see sys/socket.h)
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* protocol (see sys/socket.h)
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*
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* Returned Value:
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* A non-negative socket descriptor on success; -1 on error with errno set
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* appropriately.
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*
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* EACCES
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* Permission to create a socket of the specified type and/or protocol
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* is denied.
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* EAFNOSUPPORT
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* The implementation does not support the specified address family.
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* EINVAL
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* Unknown protocol, or protocol family not available.
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* EMFILE
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* Process file table overflow.
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* ENFILE
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* The system limit on the total number of open files has been reached.
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* ENOBUFS or ENOMEM
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* Insufficient memory is available. The socket cannot be created until
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* sufficient resources are freed.
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* EPROTONOSUPPORT
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* The protocol type or the specified protocol is not supported within
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* this domain.
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*
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* Assumptions:
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*
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****************************************************************************/
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int socket(int domain, int type, int protocol)
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{
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FAR struct socket *psock;
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int errcode;
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int sockfd;
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int ret;
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/* Allocate a socket descriptor */
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sockfd = sockfd_allocate(0);
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if (sockfd < 0)
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{
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nerr("ERROR: Failed to allodate a socket descriptor\n");
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errcode = ENFILE;
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goto errout;
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}
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/* Get the underlying socket structure */
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psock = sockfd_socket(sockfd);
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if (!psock)
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{
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errcode = ENOSYS; /* should not happen */
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goto errout_with_sockfd;
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}
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/* Initialize the socket structure */
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ret = psock_socket(domain, type, protocol, psock);
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if (ret < 0)
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{
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nerr("ERROR: psock_socket() failed: %d\n", ret);
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errcode = -ret;
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goto errout_with_sockfd;
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}
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return sockfd;
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errout_with_sockfd:
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sockfd_release(sockfd);
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errout:
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set_errno(errcode);
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return ERROR;
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}
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#endif /* CONFIG_NET */
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