/**************************************************************************** * net/socket/sendto.c * * Copyright (C) 2007-2009, 2011-2015, 2017 Gregory Nutt. All rights * reserved. * Author: Gregory Nutt * * 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 #include #include #include #include #include #include #include #include #include "socket/socket.h" /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: psock_sendto * * Description: * If sendto() is used on a connection-mode (SOCK_STREAM, SOCK_SEQPACKET) * socket, the parameters to and 'tolen' are ignored (and the error EISCONN * may be returned when they are not NULL and 0), and the error ENOTCONN is * returned when the socket was not actually connected. * * Input Parameters: * psock A pointer to a NuttX-specific, internal socket structure * buf Data to send * len Length of data to send * flags Send flags * to Address of recipient * tolen The length of the address structure * * Returned Value: * On success, returns the number of characters sent. On a negated errno * value is returned. One of: * * EAGAIN or EWOULDBLOCK * The socket is marked non-blocking and the requested operation * would block. * EBADF * An invalid descriptor was specified. * ECONNRESET * Connection reset by peer. * EDESTADDRREQ * The socket is not connection-mode, and no peer address is set. * EFAULT * An invalid user space address was specified for a parameter. * EINTR * A signal occurred before any data was transmitted. * EINVAL * Invalid argument passed. * EISCONN * The connection-mode socket was connected already but a recipient * was specified. (Now either this error is returned, or the recipient * specification is ignored.) * EMSGSIZE * The socket type requires that message be sent atomically, and the * size of the message to be sent made this impossible. * ENOBUFS * The output queue for a network interface was full. This generally * indicates that the interface has stopped sending, but may be * caused by transient congestion. * ENOMEM * No memory available. * ENOTCONN * The socket is not connected, and no target has been given. * ENOTSOCK * The argument s is not a socket. * EOPNOTSUPP * Some bit in the flags argument is inappropriate for the socket * type. * EPIPE * The local end has been shut down on a connection oriented socket. * In this case the process will also receive a SIGPIPE unless * MSG_NOSIGNAL is set. * ****************************************************************************/ ssize_t psock_sendto(FAR struct socket *psock, FAR const void *buf, size_t len, int flags, FAR const struct sockaddr *to, socklen_t tolen) { struct iovec iov; struct msghdr msg; iov.iov_base = buf; iov.iov_len = len; msg.msg_name = to; msg.msg_namelen = tolen; msg.msg_iov = &iov; msg.msg_iovlen = 1; msg.msg_control = NULL; msg.msg_controllen = 0; msg.msg_flags = 0; /* And let psock_sendmsg do all of the work */ return psock_sendmsg(psock, &msg, flags); } /**************************************************************************** * Name: sendto * * Description: * If sendto() is used on a connection-mode (SOCK_STREAM, SOCK_SEQPACKET) * socket, the parameters to and 'tolen' are ignored (and the error EISCONN * may be returned when they are not NULL and 0), and the error ENOTCONN is * returned when the socket was not actually connected. * * Input Parameters: * sockfd Socket descriptor of socket * buf Data to send * len Length of data to send * flags Send flags * to Address of recipient * tolen The length of the address structure * * Returned Value: * On success, returns the number of characters sent. On error, * -1 is returned, and errno is set appropriately: * * EAGAIN or EWOULDBLOCK * The socket is marked non-blocking and the requested operation * would block. * EBADF * An invalid descriptor was specified. * ECONNRESET * Connection reset by peer. * EDESTADDRREQ * The socket is not connection-mode, and no peer address is set. * EFAULT * An invalid user space address was specified for a parameter. * EINTR * A signal occurred before any data was transmitted. * EINVAL * Invalid argument passed. * EISCONN * The connection-mode socket was connected already but a recipient * was specified. (Now either this error is returned, or the recipient * specification is ignored.) * EMSGSIZE * The socket type requires that message be sent atomically, and the * size of the message to be sent made this impossible. * ENOBUFS * The output queue for a network interface was full. This generally * indicates that the interface has stopped sending, but may be * caused by transient congestion. * ENOMEM * No memory available. * ENOTCONN * The socket is not connected, and no target has been given. * ENOTSOCK * The argument s is not a socket. * EOPNOTSUPP * Some bit in the flags argument is inappropriate for the socket * type. * EPIPE * The local end has been shut down on a connection oriented socket. * In this case the process will also receive a SIGPIPE unless * MSG_NOSIGNAL is set. * ****************************************************************************/ ssize_t sendto(int sockfd, FAR const void *buf, size_t len, int flags, FAR const struct sockaddr *to, socklen_t tolen) { FAR struct socket *psock; ssize_t ret; /* sendto() is a cancellation point */ enter_cancellation_point(); /* Get the underlying socket structure */ psock = sockfd_socket(sockfd); /* And let psock_sendto do all of the work */ ret = psock_sendto(psock, buf, len, flags, to, tolen); if (ret < 0) { _SO_SETERRNO(psock, -ret); ret = ERROR; } leave_cancellation_point(); return ret; }