nuttx/net/socket/sendmsg.c

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2020-06-15 10:23:25 +02:00
/****************************************************************************
* net/socket/sendmsg.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
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*
* http://www.apache.org/licenses/LICENSE-2.0
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*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
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*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <assert.h>
#include <errno.h>
#include <nuttx/cancelpt.h>
#include <nuttx/net/net.h>
#include "socket/socket.h"
#ifdef CONFIG_NET
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/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: psock_sendmsg
*
* Description:
* psock_sendfrom() sends messages to a socket, and may be used to
* send data on a socket whether or not it is connection-oriented.
* This is an internal OS interface. It is functionally equivalent to
* sendfrom() except that:
*
* - It is not a cancellation point,
* - It does not modify the errno variable, and
* - It accepts the internal socket structure as an input rather than an
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* task-specific socket descriptor.
*
* Input Parameters:
* psock A pointer to a NuttX-specific, internal socket structure
* msg Message to send
* flags Receive flags
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*
* Returned Value:
* On success, returns the number of characters sent. If no data is
* available to be received and the peer has performed an orderly shutdown,
* sendmsg() will return 0. Otherwise, on any failure, a negated errno
* value is returned (see comments with sendmsg() for a list of appropriate
* errno values).
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*
****************************************************************************/
ssize_t psock_sendmsg(FAR struct socket *psock, FAR struct msghdr *msg,
int flags)
{
/* Verify that non-NULL pointers were passed */
if (msg == NULL || msg->msg_iov == NULL || msg->msg_iov->iov_base == NULL)
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{
return -EINVAL;
}
/* Verify that the sockfd corresponds to valid, allocated socket */
if (psock == NULL || psock->s_conn == NULL)
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{
return -EBADF;
}
/* Let logic specific to this address family handle the sendmsg()
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* operation.
*/
DEBUGASSERT(psock->s_sockif != NULL &&
psock->s_sockif->si_sendmsg != NULL);
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return psock->s_sockif->si_sendmsg(psock, msg, flags);
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}
/****************************************************************************
* Function: sendmsg
*
* Description:
* The sendmsg() call is identical to sendfrom() with a NULL from
* parameter.
*
* Parameters:
* sockfd Socket descriptor of socket
* msg Buffer to receive the message
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* flags Receive flags
*
* Returned Value:
* On success, returns the number of characters received. On error,
* -1 is returned, and errno is set appropriately:
*
* EAGAIN
* The socket is marked non-blocking and the receive operation would
* block, or a receive timeout had been set and the timeout expired
* before data was received.
* EBADF
* The argument sockfd is an invalid descriptor.
* ECONNREFUSED
* A remote host refused to allow the network connection (typically
* because it is not running the requested service).
* EFAULT
* The receive buffer pointer(s) point outside the process's address
* space.
* EINTR
* The receive was interrupted by delivery of a signal before any data
* were available.
* EINVAL
* Invalid argument passed.
* ENOMEM
* Could not allocate memory.
* ENOTCONN
* The socket is associated with a connection-oriented protocol and has
* not been connected.
* ENOTSOCK
* The argument sockfd does not refer to a socket.
*
****************************************************************************/
ssize_t sendmsg(int sockfd, FAR struct msghdr *msg, int flags)
{
FAR struct socket *psock;
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ssize_t ret;
/* sendmsg() is a cancellation point */
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enter_cancellation_point();
/* Get the underlying socket structure */
psock = sockfd_socket(sockfd);
/* Then let psock_sendmsg() do all of the work */
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ret = psock_sendmsg(psock, msg, flags);
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if (ret < 0)
{
_SO_SETERRNO(psock, -ret);
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ret = ERROR;
}
leave_cancellation_point();
return ret;
}
#endif /* CONFIG_NET */