/* chatclient.c */#include <stdlib.h>#include <stdio.h>#include <cnaiapi.h>#define BUFFSIZE		256#define INPUT_PROMPT		"Input_$"#define RECEIVED_PROMPT		"Received:"int recvln(connection, char *, int);int readln(char *, int);int main(int argc, char *argv[]) {      char *msg="The author of this program is iFreeBSD (version 1.0)\n" ; 	computer	comp;	connection	conn;	char		buff[BUFFSIZE];	int		len;      printf(msg) ;	if (argc != 3) {		(void) fprintf(stderr, "usage: %s <compname> <appnum>\n",			       argv[0]);		exit(1);	}	comp = cname_to_comp(argv[1]);	if (comp == -1)		exit(1);	conn = make_contact(comp, (appnum) atoi(argv[2]));	if (conn < 0) 		exit(1);	printf("Connection Is Established.\n");	printf(INPUT_PROMPT);	fflush(stdout);	while((len = readln(buff, BUFFSIZE)) > 0) {		buff[len - 1] = '\n';		send(conn, buff, len, 0);				if ((len = recvln(conn, buff, BUFFSIZE)) < 1)			break;		printf(RECEIVED_PROMPT);		fflush(stdout);		write(STDOUT_FILENO, buff, len);	      printf(INPUT_PROMPT);	      fflush(stdout);	}		printf("\nClosed.Bye!\n");	send_eof(conn);	exit(0);}