TCP clent/server to transfer a file

/* tcp client program */

#include "unp.h"
void
str_cli(FILE *fp, int sockfd)
{
char sendline[MAXLINE], recvline[MAXLINE];
while (Fgets(sendline, MAXLINE, fp) != NULL) {
Writen(sockfd, sendline, strlen(sendline));
if (Readline(sockfd, recvline, MAXLINE) == 0)
err_quit("str_cli: server terminated prematurely");
Fputs(recvline, stdout);
}
}
int
main(int argc, char **argv)
{
int sockfd;
struct sockaddr_in servaddr;
if (argc != 2)
err_quit("usage: tcpcli <IPaddress>");
sockfd = Socket(AF_INET, SOCK_STREAM, 0);
bzero(&servaddr, sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_port = htons(SERV_PORT);
Inet_pton(AF_INET, argv[1], &servaddr.sin_addr);
Connect(sockfd, (SA *) &servaddr, sizeof(servaddr));
str_cli(stdin, sockfd); /* do it all */
exit(0);
}

/* tcp server program */
/* TCP server to transfer the file */
　
#include "unp.h"
void
str_echo(int sockfd)
{
long arg1, arg2;
ssize_t n;
char line[MAXLINE];
char fname[100];
char ch;
FILE*f;

int i=0;
for ( ; ; ) {
if ( (n = Readline(sockfd, line, MAXLINE)) == 0)
return; /* connection closed by other end */
n = strlen(line);
printf("\nReq From Client for file : %s",line);

strcpy(fname,line);
f=fopen("myfile","r");
while((ch=getc(f))!=EOF)
{
line[i++]=ch;
}
printf("\n....%d",i);
fclose(f);
Writen(sockfd, line, n);
}
}
int
main(int argc, char **argv)
{
int listenfd, connfd;
pid_t childpid;
socklen_t clilen;
struct sockaddr_in cliaddr, servaddr;
listenfd = Socket(AF_INET, SOCK_STREAM, 0);
bzero(&servaddr, sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
servaddr.sin_port = htons(SERV_PORT);
Bind(listenfd, (SA *) &servaddr, sizeof(servaddr));
Listen(listenfd, LISTENQ);
printf("Server Running on Port %d\n", SERV_PORT);
for ( ; ; ) {
clilen = sizeof(cliaddr);
connfd = Accept(listenfd, (SA *) &cliaddr, &clilen);
if ( (childpid = Fork()) == 0) { /* child process */
Close(listenfd); /* close listening socket */
str_echo(connfd); /* process the request */

exit(0);

}
Close(connfd); /* parent closes connected socket */
}
}