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

int main(int argc, char * argv[])
{
	int sockfd;
	struct sockaddr_in addr;
	char buf[100];

	if (argc < 3) {
		printf("Usage: a.out ip_addr port.\n");
		exit(0);
	}

	if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
		perror(": Can't get socket");
		exit(1);
	}
	
	// preparing server socket address
	memset(&addr, 0, sizeof(struct sockaddr_in));
	addr.sin_family = AF_INET;
	addr.sin_port = htons((short)atoi(argv[2]));
	addr.sin_addr.s_addr = inet_addr(argv[1]);

	fprintf(stderr, "here 1\n");

	// connecting to the server
	if (connect(sockfd, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
		perror(": connect");
		exit(1);
	}

	// connection established
	fprintf(stderr, "here 2\n");
	printf("Connected.\n"); fflush(0);

	// send an integer (directly)
	{ int ii;
		ii = 100;
		printf("ii= %d %x\n", ii, ii);
		write(sockfd, &ii , sizeof(int));
	}

	// Then we read from standard input and write to socket
	while (fgets(buf, 100, stdin)) {
		write(sockfd, buf, strlen(buf)+1);
		if (read(sockfd, buf, 100)==0) {
			printf("server closed the connection.\n");
			exit(0);
		}; 
		// buf must be null terminated string
		// server does not send back the integer value
		printf("Server response : %s\n", buf);
	}
}