Suggestions on how to handle this more efficiently
From: Materialised (materialised_at_ntlworld.com)
Date: 09/04/03
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Date: Thu, 04 Sep 2003 16:54:54 +0100
Hello everyone,
I have just started programming in c on freeBSD. I have been reading
Beej's Guide to network programming, and am currently developing my
first program, a tcp based 1 on one chat client and server.
I am looking for suggestions on how I can handle the sending and
recieving of the strings differently, rather than having a continuous
loop running through the program, as to me this doesnt seem very efficient.
Here is my code....
//chatclient.c
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <netdb.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#define PORT 2100
#define MAXDATASIZE 10000
#define MAX_LENGTH 1024
int main(int argc, char *argv[])
{
int len, sockfd, numbytes;
char buf[MAXDATASIZE];
struct hostent *he;
struct sockaddr_in their_addr; // connector's address information
char msg[MAX_LENGTH];
if (argc != 2) {
printf("Usage: ./chatclient <IPADDRESS>\n");
exit(1);
}
if ((he=gethostbyname(argv[1])) == NULL) { // get the host info
perror("gethostbyname");
exit(1);
}
if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
perror("socket");
exit(1);
}
their_addr.sin_family = AF_INET; // host byte order
their_addr.sin_port = htons(PORT); // short, network byte order
their_addr.sin_addr = *((struct in_addr *)he->h_addr);
memset(&(their_addr.sin_zero), '\0', 8); // zero the rest of the struct
if (connect(sockfd, (struct sockaddr *)&their_addr, sizeof(struct
sockaddr)) == -1) { //And finally we connect
perror("connect");
exit(1);
}
else printf("Connected to %s\n\n", argv[1]);
do {
printf("Please Enter a message to send\n");
scanf("%s", msg);
len = strlen(msg);
if(len > 1024) {
printf("You can only send a Maximum of 1024 characters\n");
}
else {
if(send(sockfd, msg, len, 0) == -1) {
perror("send");
exit(1);
}
// break;
}
if ((numbytes=recv(sockfd, buf, MAXDATASIZE-1, 0)) == -1) {
perror("recv");
exit(1);
}
else printf("Message from %s:%s\n", argv[1], buf);
} while (!strcmp(msg, "exit") == 0);
return 0;
}
- Next message: Frank Schmitt: "Re: Question about "find" and how to run "wc" & output to a file..."
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