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client.c
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client.c
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#include <string.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <netdb.h>
#include <unistd.h>
#include <stdlib.h>
#define SERV_TCP_PORT 8111 /* server's port */
#define MAX_SIZE 80
int main(int argc, char *argv[])
{
int sockfd;
struct sockaddr_in serv_addr;
char *serv_host = "localhost";
struct hostent *host_ptr;
int port;
int buff_size = 0;
char string[MAX_SIZE] ;
int len;
/* command line: client [host [port]]*/
if(argc >= 2)
serv_host = argv[1]; /* read the host if provided */
if(argc == 3)
sscanf(argv[2], "%d", &port); /* read the port if provided */
else
port = SERV_TCP_PORT;
/* get the address of the host */
if((host_ptr = gethostbyname(serv_host)) == NULL) {
perror("gethostbyname error");
exit(1);
}
if(host_ptr->h_addrtype != AF_INET) {
perror("unknown address type");
exit(1);
}
bzero((char *) &serv_addr, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr =
((struct in_addr *)host_ptr->h_addr_list[0])->s_addr;
serv_addr.sin_port = htons(port);
/* open a TCP socket */
if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
perror("can't open stream socket");
exit(1);
}
/* connect to the server */
if(connect(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
perror("can't connect to server");
exit(1);
}
int one =1;
setsockopt(sockfd, IPPROTO_TCP, TCP_NODELAY, &one, sizeof(one));
/* write a message to the server */
write(sockfd, "hello world", sizeof("hello world"));
len = read(sockfd, string, MAX_SIZE);
string[len]=0;
printf("in client %s\n", string);
close(sockfd);
}