examples/udgram/udgram_client.c

/****************************************************************************
 * examples/udgram/udgram_client.c
 *
 *   Copyright (C) 2015 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *
 * 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 Gregory Nutt 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 <nuttx/config.h>

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>

#include "udgram.h"

/****************************************************************************
 * Private Functions
 ****************************************************************************/

static inline void fill_buffer(unsigned char *buf, int offset)
{
  int ch;
  int j;

  buf[0] = offset;
  for (ch = 0x20, j = offset + 1; ch < 0x7f; ch++, j++)
    {
      if (j >= SENDSIZE)
        {
          j = 1;
        }
      buf[j] = ch;
    }
}

/****************************************************************************
 * Public Functions
 ****************************************************************************/

#ifdef CONFIG_BUILD_KERNEL
int main(int argc, FAR char *argv[])
#else
int client_main(int argc, char *argv[])
#endif
{
  struct sockaddr_un server;
  unsigned char outbuf[SENDSIZE];
  socklen_t addrlen;
  int sockfd;
  int nbytes;
  int offset;

  /* Create a new UDP socket */

  sockfd = socket(PF_LOCAL, SOCK_DGRAM, 0);
  if (sockfd < 0)
    {
      printf("client: ERROR socket failure %d\n", errno);
      return 1;
    }

  /* Then send and receive 256 messages */

  for (offset = 0; offset < 256; offset++)
    {
      /* Set up the output buffer */

      fill_buffer(outbuf, offset);

      /* Set up the server address */

      addrlen = strlen(CONFIG_EXAMPLES_UDGRAM_ADDR);
      if (addrlen > UNIX_PATH_MAX - 1)
        {
          addrlen = UNIX_PATH_MAX - 1;
        }

      server.sun_family = AF_LOCAL;
      strncpy(server.sun_path, CONFIG_EXAMPLES_UDGRAM_ADDR, addrlen);
      server.sun_path[addrlen] = '\0';

      addrlen += sizeof(sa_family_t) + 1;

      /* Send the message */

      printf("client: %d. Sending %d bytes\n", offset, SENDSIZE);
      nbytes = sendto(sockfd, outbuf, SENDSIZE, 0,
                      (struct sockaddr *)&server, addrlen);

      if (nbytes < 0)
        {
          printf("client: %d. ERROR sendto failed: %d\n", offset, errno);
          close(sockfd);
          return 1;
        }
      else if (nbytes != SENDSIZE)
        {
          printf("client: %d. ERROR Bad send length: %d Expected: %d\n",
                 offset, nbytes, SENDSIZE);
          close(sockfd);
          return 1;
        }

      printf("client: %d. Sent %d bytes\n", offset, nbytes);
    }

  close(sockfd);
  return 0;
}