136 lines
4.1 KiB
C
136 lines
4.1 KiB
C
/****************************************************************************
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* examples/udp/udp-client.c
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*
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* Copyright (C) 2007 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name Gregory Nutt nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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 <sys/types.h>
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#include <sys/socket.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <arpa/inet.h>
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#include <netinet/in.h>
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#include "udp-internal.h"
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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static inline void fill_buffer(unsigned char *buf, int offset)
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{
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int ch;
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int j;
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buf[0] = offset;
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for (ch = 0x20, j = offset + 1; ch < 0x7f; ch++, j++)
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{
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if (j >= SENDSIZE)
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{
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j = 1;
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}
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buf[j] = ch;
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}
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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void send_client(void)
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{
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struct sockaddr_in server;
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unsigned char outbuf[SENDSIZE];
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int sockfd;
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int nbytes;
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int offset;
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/* Create a new UDP socket */
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sockfd = socket(PF_INET, SOCK_DGRAM, 0);
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if (sockfd < 0)
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{
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printf("client socket failure %d\n", errno);
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exit(1);
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}
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/* Then send and receive 256 messages */
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for (offset = 0; offset < 256; offset++)
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{
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/* Set up the output buffer */
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fill_buffer(outbuf, offset);
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/* Send the message */
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server.sin_family = AF_INET;
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server.sin_port = HTONS(PORTNO);
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server.sin_addr.s_addr = HTONL(CONFIG_EXAMPLES_UDP_SERVERIP);
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printf("client: %d. Sending %d bytes\n", offset, SENDSIZE);
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nbytes = sendto(sockfd, outbuf, SENDSIZE, 0,
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(struct sockaddr*)&server, sizeof(struct sockaddr_in));
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printf("client: %d. Sent %d bytes\n", offset, nbytes);
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if (nbytes < 0)
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{
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printf("client: %d. sendto failed: %d\n", offset, errno);
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close(sockfd);
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exit(-1);
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}
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else if (nbytes != SENDSIZE)
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{
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printf("client: %d. Bad send length: %d Expected: %d\n",
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offset, nbytes, SENDSIZE);
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close(sockfd);
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exit(-1);
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}
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/* Now, sleep a bit. No packets should be dropped due to overrunning
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* the server.
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*/
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sleep(2);
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}
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close(sockfd);
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}
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