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/****************************************************************************
* net/socket.c
*
* Copyright (C) 2007 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* 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 <sys/types.h>
#include <sys/socket.h>
#include <errno.h>
#include "net_internal.h"
/****************************************************************************
* Global Functions
****************************************************************************/
/****************************************************************************
* Function: socket
*
* Description:
* socket() creates an endpoint for communication and returns a descriptor.
*
* Parameters:
* domain (see sys/socket.h)
* type (see sys/socket.h)
* protocol (see sys/socket.h)
*
* Returned Value:
* 0 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)
{
#ifdef CONFIG_NET_UDP
FAR struct socket *psock;
#endif
int sockfd;
int err;
/* Only PF_INET or PF_INET6 domains supported */
#ifdef CONFIG_NET_IPv6
if ( domain != PF_INET6)
#else
if ( domain != PF_INET)
#endif
{
err = EAFNOSUPPORT;
goto errout;
}
/* Only SOCK_STREAM and possible SOCK_DRAM are supported */
#ifdef CONFIG_NET_UDP
if (protocol != 0 || (type != SOCK_STREAM && type != SOCK_DGRAM))
#else
if (protocol != 0 || type != SOCK_STREAM)
#endif
{
err = EPROTONOSUPPORT;
goto errout;
}
/* Everything looks good. Allocate a socket descriptor */
sockfd = sockfd_allocate();
if (sockfd < 0)
{
err = ENFILE;
goto errout;
}
/* Initialize the socket structure */
psock = sockfd_socket(sockfd);
if (psock)
{
/* Save the protocol type */
psock->s_type = type;
/* Allocate a TCP connection structure */
psock->s_conn = uip_tcpalloc();
if (!psock->s_conn)
{
/* Failed to reserve a connection structure */
sockfd_release(sockfd);
err = ENFILE;
goto errout;
}
}
return sockfd;
errout:
*get_errno_ptr() = err;
return ERROR;
}
#endif /* CONFIG_NET */
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