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