tcp_server.c

The source code example of ARM9 development board from Artila (M-501 starter kit). The source code c

/*
 *	Description: 
 *		tcp server example
 *		tcp echo server: listen tcp port 4000, and echo back the received data.
 *
 *		What is shown in this example:
 *		1. How to program a tcp echo server
 *		
 */
#include <stdio.h>
#include <errno.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>

int
main(argc, argv)
	int	argc;
	char	*argv[];
{
	int	fd_listen, fd_client, size, ret;
	struct sockaddr_in dest;
	char	buf[1024];

	/*create a socket*/
	fd_listen = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
	if (fd_listen < 0) {
  		printf("socket failed\n");
  		return 0;		
	}

	/*use bind function to associate an address with a socket*/
	bzero(&dest, sizeof(dest));
	dest.sin_family = AF_INET;
	dest.sin_port = htons(4000);
	dest.sin_addr.s_addr = htonl(INADDR_ANY);
	bind(fd_listen, (struct sockaddr*)&dest, sizeof(dest));

	/*listen 1 connect request*/
	listen(fd_listen, 1);

	size = sizeof(dest);
	/*retrieve a connect request*/
       	fd_client = accept(fd_listen, (struct sockaddr*)&dest, &size);
	if (fd_client == -1) {
		printf("accept failed, errno: %d\r\n", errno);
		close(fd_listen);
		return 0;
       	}
       	printf("accept: %s, port %d\r\n", 
			inet_ntoa(dest.sin_addr), htons(dest.sin_port));

	while(1) {
		/*when data received, send them back*/
		ret = recv(fd_client, buf, sizeof(buf), 0);
		if (ret > 0) {
			send(fd_client, buf, ret, 0);
		} else if (ret == 0) {
			printf("disconnect by remote\r\n");
			break;
		} else if (ret < 0) {
			printf("read from ethernet failed, errno: %d\r\n", errno);
			break;
		}
	}
	close(fd_listen);
	close(fd_client);
	return 0;
}