client.c

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#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#define MAXLINE 256

int main(int argc, char *argv[])
{
	struct sockaddr_in serv;
	char buf[MAXLINE];
	int fd;
	char *str = "A default test string";

	if (argc>1) str = argv[1];

	bzero(&serv, sizeof(serv));
	serv.sin_family = AF_INET;
	serv.sin_addr.s_addr = inet_addr("127.0.0.1");
	serv.sin_port = htons(8000);

	fd = socket(AF_INET, SOCK_STREAM, 0);
	connect(fd, (struct sockaddr *)&serv, sizeof(serv));
	write(fd, str, strlen(str)+1);
	read(fd, buf, MAXLINE);
	printf("Response from server: %s\n", buf);
	close(fd);

	return 0;
}