218 lines
7.0 KiB
C
218 lines
7.0 KiB
C
/****************************************************************************
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* net/socket/send.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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/types.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 <nuttx/cancelpt.h>
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#include <nuttx/net/net.h>
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#include "socket/socket.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: psock_send
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*
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* Description:
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* The psock_send() call may be used only when the socket is in a
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* connected state (so that the intended recipient is known). This is an
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* internal OS interface. It is functionally equivalent to send() except
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* that:
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*
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* - It is not a cancellation point,
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* - It does not modify the errno variable, and
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* - I accepts the internal socket structure as an input rather than an
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* task-specific socket descriptor.
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*
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* See comments with send() for more a more complete description of the
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* functionality.
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*
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* Input Parameters:
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* psock An instance of the internal socket structure.
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* buf Data to send
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* len Length of data to send
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* flags Send flags
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*
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* Returned Value:
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* On success, returns the number of characters sent. On any failure, a
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* negated errno value is returned (See comments with send() for a list
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* of the appropriate errno value).
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*
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****************************************************************************/
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ssize_t psock_send(FAR struct socket *psock, FAR const void *buf, size_t len,
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int flags)
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{
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struct msghdr msg;
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struct iovec iov;
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iov.iov_base = (FAR void *)buf;
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iov.iov_len = len;
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msg.msg_name = NULL;
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msg.msg_namelen = 0;
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msg.msg_iov = &iov;
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msg.msg_iovlen = 1;
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msg.msg_control = NULL;
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msg.msg_controllen = 0;
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msg.msg_flags = 0;
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/* And let psock_sendmsg do all of the work */
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return psock_sendmsg(psock, &msg, flags);
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}
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/****************************************************************************
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* Name: nx_send
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*
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* Description:
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* The nx_send() call may be used only when the socket is in a
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* connected state (so that the intended recipient is known). This is an
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* internal OS interface. It is functionally equivalent to send() except
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* that:
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*
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* - It is not a cancellation point, and
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* - It does not modify the errno variable.
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*
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* See comments with send() for more a more complete description of the
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* functionality.
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*
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* Input Parameters:
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* sockfd Socket descriptor of the socket
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* buf Data to send
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* len Length of data to send
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* flags Send flags
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*
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* Returned Value:
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* On success, returns the number of characters sent. On any failure, a
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* negated errno value is returned (See comments with send() for a list
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* of the appropriate errno value).
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*
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****************************************************************************/
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ssize_t nx_send(int sockfd, FAR const void *buf, size_t len, int flags)
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{
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FAR struct socket *psock;
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/* Get the underlying socket structure */
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psock = sockfd_socket(sockfd);
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/* And let psock_send do all of the work */
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return psock_send(psock, buf, len, flags);
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}
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/****************************************************************************
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* Name: send
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*
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* Description:
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* The send() call may be used only when the socket is in a connected state
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* (so that the intended recipient is known). The only difference between
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* send() and write() is the presence of flags. With zero flags parameter,
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* send() is equivalent to write(). Also, send(sockfd,buf,len,flags) is
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* equivalent to sendto(sockfd,buf,len,flags,NULL,0).
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*
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* Input Parameters:
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* sockfd Socket descriptor of the socket
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* buf Data to send
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* len Length of data to send
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* flags Send flags
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*
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* Returned Value:
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* On success, returns the number of characters sent. On error,
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* -1 is returned, and errno is set appropriately:
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*
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* EAGAIN or EWOULDBLOCK
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* The socket is marked non-blocking and the requested operation
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* would block.
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* EBADF
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* An invalid descriptor was specified.
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* ECONNRESET
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* Connection reset by peer.
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* EDESTADDRREQ
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* The socket is not connection-mode, and no peer address is set.
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* EFAULT
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* An invalid user space address was specified for a parameter.
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* EINTR
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* A signal occurred before any data was transmitted.
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* EINVAL
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* Invalid argument passed.
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* EISCONN
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* The connection-mode socket was connected already but a recipient
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* was specified. (Now either this error is returned, or the recipient
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* specification is ignored.)
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* EMSGSIZE
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* The socket type requires that message be sent atomically, and the
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* size of the message to be sent made this impossible.
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* ENOBUFS
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* The output queue for a network interface was full. This generally
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* indicates that the interface has stopped sending, but may be
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* caused by transient congestion.
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* ENOMEM
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* No memory available.
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* ENOTCONN
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* The socket is not connected, and no target has been given.
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* ENOTSOCK
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* The argument s is not a socket.
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* EOPNOTSUPP
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* Some bit in the flags argument is inappropriate for the socket
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* type.
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* EPIPE
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* The local end has been shut down on a connection oriented socket.
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* In this case the process will also receive a SIGPIPE unless
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* MSG_NOSIGNAL is set.
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*
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* Assumptions:
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*
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****************************************************************************/
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ssize_t send(int sockfd, FAR const void *buf, size_t len, int flags)
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{
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ssize_t ret;
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/* send() is a cancellation point */
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enter_cancellation_point();
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/* Let psock_send() do all of the work */
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ret = nx_send(sockfd, buf, len, flags);
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if (ret < 0)
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{
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_SO_SETERRNO(sockfd_socket(sockfd), -ret);
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ret = ERROR;
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}
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leave_cancellation_point();
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return ret;
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}
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