px4-firmware/apps/examples/poll/host.c

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/****************************************************************************
* examples/poll/host.c
*
* Copyright (C) 2008-2009, 2012 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 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 <sys/socket.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <pthread.h>
#include <string.h>
#include <errno.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#define pthread_addr_t void *
#include "poll_internal.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#ifndef TARGETIP
# error TARGETIP not defined
#endif
#define IOBUFFER_SIZE 80
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* main
****************************************************************************/
int main(int argc, char **argv, char **envp)
{
struct sockaddr_in myaddr;
char outbuf[IOBUFFER_SIZE];
char inbuf[IOBUFFER_SIZE];
int sockfd;
int len;
int nbytessent;
int nbytesrecvd;
int i;
/* Create a new TCP socket */
sockfd = socket(PF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
{
message("client socket failure %d\n", errno);
goto errout_with_outbufs;
}
/* Connect the socket to the server */
myaddr.sin_family = AF_INET;
myaddr.sin_port = htons(LISTENER_PORT);
myaddr.sin_addr.s_addr = inet_addr(TARGETIP);
message("client: Connecting to %s...\n", TARGETIP);
if (connect( sockfd, (struct sockaddr*)&myaddr, sizeof(struct sockaddr_in)) < 0)
{
message("client: connect failure: %d\n", errno);
goto errout_with_socket;
}
message("client: Connected\n");
/* Then send and receive messages */
for (i = 0; ; i++)
{
sprintf(outbuf, "Remote message %d", i);
len = strlen(outbuf);
message("client: Sending '%s' (%d bytes)\n", outbuf, len);
nbytessent = send(sockfd, outbuf, len, 0);
message("client: Sent %d bytes\n", nbytessent);
if (nbytessent < 0)
{
message("client: send failed: %d\n", errno);
goto errout_with_socket;
}
else if (nbytessent != len)
{
message("client: Bad send length: %d Expected: %d\n", nbytessent, len);
goto errout_with_socket;
}
message("client: Receiving...\n");
nbytesrecvd = recv(sockfd, inbuf, IOBUFFER_SIZE, 0);
if (nbytesrecvd < 0)
{
message("client: recv failed: %d\n", errno);
goto errout_with_socket;
}
else if (nbytesrecvd == 0)
{
message("client: The server broke the connections\n");
goto errout_with_socket;
}
inbuf[nbytesrecvd] = '\0';
message("client: Received '%s' (%d bytes)\n", inbuf, nbytesrecvd);
if (nbytesrecvd != len)
{
message("client: Bad recv length: %d Expected: %d\n", nbytesrecvd, len);
goto errout_with_socket;
}
else if (memcmp(inbuf, outbuf, len) != 0)
{
message("client: Received outbuf does not match sent outbuf\n");
goto errout_with_socket;
}
message("client: Sleeping\n");
sleep(8);
}
close(sockfd);
return 0;
errout_with_socket:
close(sockfd);
errout_with_outbufs:
exit(1);
}