/**************************************************************************** * net/socket/send.c * * Copyright (C) 2007-2014, 2016-2017 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 "socket/socket.h" /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: psock_send * * Description: * The psock_send() call may be used only when the socket is in a * connected state (so that the intended recipient is known). This is an * internal OS interface. It is functionally equivalent to send() except * that: * * - It is not a cancellation point, * - It does not modify the errno variable, and * - I accepts the internal socket structure as an input rather than an * task-specific socket descriptor. * * See comments with send() for more a more complete description of the * functionality. * * Parameters: * psock - An instance of the internal socket structure. * buf - Data to send * len - Length of data to send * flags - Send flags * * Returned Value: * On success, returns the number of characters sent. On any failure, a * negated errno value is returned (See comments with send() for a list * of the appropriate errno value). * ****************************************************************************/ ssize_t psock_send(FAR struct socket *psock, FAR const void *buf, size_t len, int flags) { ssize_t ret; DEBUGASSERT(psock != NULL && buf != NULL); /* Verify that the sockfd corresponds to valid, allocated socket */ if (psock == NULL || psock->s_crefs <= 0) { return -EBADF; } /* Let the address family's send() method handle the operation */ DEBUGASSERT(psock->s_sockif != NULL && psock->s_sockif->si_send != NULL); ret = psock->s_sockif->si_send(psock, buf, len, flags); if (ret < 0) { nerr("ERROR: socket si_send() (or usrsock_sendto()) failed: %d\n", ret); } return ret; } /**************************************************************************** * Name: nx_send * * Description: * The nx_send() call may be used only when the socket is in a * connected state (so that the intended recipient is known). This is an * internal OS interface. It is functionally equivalent to send() except * that: * * - It is not a cancellation point, and * - It does not modify the errno variable. * * See comments with send() for more a more complete description of the * functionality. * * Parameters: * sockfd - Socket descriptor of the socket * buf - Data to send * len - Length of data to send * flags - Send flags * * Returned Value: * On success, returns the number of characters sent. On any failure, a * negated errno value is returned (See comments with send() for a list * of the appropriate errno value). * ****************************************************************************/ ssize_t nx_send(int sockfd, FAR const void *buf, size_t len, int flags) { FAR struct socket *psock; /* Get the underlying socket structure */ psock = sockfd_socket(sockfd); /* And let psock_send do all of the work */ return psock_send(psock, buf, len, flags); } /**************************************************************************** * Name: send * * Description: * The send() call may be used only when the socket is in a connected state * (so that the intended recipient is known). The only difference between * send() and write() is the presence of flags. With zero flags parameter, * send() is equivalent to write(). Also, send(sockfd,buf,len,flags) is * equivalent to sendto(sockfd,buf,len,flags,NULL,0). * * Parameters: * sockfd - Socket descriptor of the socket * buf - Data to send * len - Length of data to send * flags - Send flags * * 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. * * Assumptions: * ****************************************************************************/ ssize_t send(int sockfd, FAR const void *buf, size_t len, int flags) { ssize_t ret; /* send() is a cancellation point */ (void)enter_cancellation_point(); /* Let nx_send() and psock_send() do all of the work*/ ret = nx_send(sockfd, buf, len, flags); if (ret < 0) { set_errno((int)-ret); ret = ERROR; } leave_cancellation_point(); return ret; }