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learning_C++ · Guest

Hi,
I found some example code about server and client applications. But I
can not run server and client in different computers. Now, I only
run them in the different windows in Linux. I hope to I can log on a
computer that run server application from a different computer. How
can I modify those codes?

Thanks,

/*server.c*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/wait.h>
#include <signal.h>
#define MYPORT 3490 // the port users will be connecting to
#define BACKLOG 10 // how many pending connections queue will hold
void sigchld_handler(int s) {
while(wait(NULL) > 0);
}
int main(void) {
int sockfd, new_fd; // listen on sock_fd, new connection on new_fd
struct sockaddr_in my_addr; // my address information
struct sockaddr_in their_addr; // connector s address information
int sin_size;
struct sigaction sa;
int yes=1;

if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
{ perror("socket"); exit(1);
}
if (setsockopt(sockfd,SOL_SOCKET,SO_REUSEADDR,&yes,sizeof(int)) ==
-1) {
perror("setsockopt");
exit(1);
}
my_addr.sin_family = AF_INET; // host byte order
my_addr.sin_port = htons(MYPORT); // short, network byte order
my_addr.sin_addr.s_addr = INADDR_ANY; // automatically fill with my
IP
memset(&(my_addr.sin_zero), '' , Cool

; // zero the rest of the
struct

if (bind(sockfd, (struct sockaddr *)&my_addr, sizeof(struct
sockaddr)) == -1) {
perror("bind"); exit(1);
} if (listen(sockfd, BACKLOG) == -1) {
perror("listen");
exit(1);
}
sa.sa_handler = sigchld_handler; // reap all dead processes
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_RESTART;
if (sigaction(SIGCHLD, &sa, NULL) == -1) {
perror("sigaction");
exit(1);
}

while(1) { // main accept() loop
sin_size = sizeof(struct sockaddr_in);
if ((new_fd = accept(sockfd, (struct sockaddr *)&their_addr,
&sin_size)) == -1) {
perror("accept");
continue; }
printf("server: got connection from %sn",
inet_ntoa(their_addr.sin_addr));
if (!fork()) { // this is the child process
close(sockfd); // child doesn t need the listener
if (send(new_fd, "Hello, world!n", 14, 0) == -1)
perror("send");
close(new_fd);
exit(0);
}
close(new_fd); // parent doesn t need this
}
return 0;
}

/* ** client.c - a stream socket client demo */
#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 3490 // the port client will be connecting to
#define MAXDATASIZE 100 // max number of bytes we can get at once
int main(int argc, char *argv[]) {
int sockfd, numbytes;
char buf[MAXDATASIZE];
struct hostent *he;
struct sockaddr_in their_addr; // connector s address information
if (argc != 2) {
fprintf(stderr,"usage: client hostnamen");
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), '' , Cool

; // zero the rest of the
struct
if (connect(sockfd, (struct sockaddr *)&their_addr, sizeof(struct
sockaddr)) == -1) {
perror("connect");
exit(1);
}
if ((numbytes=recv(sockfd, buf, MAXDATASIZE-1, 0)) == -1) {
perror("recv");
exit(1);
}
buf[numbytes] = '' ;
printf("Received: %s",buf);
close(sockfd);
return 0;
}

Jack Klein · Guest

On 26 Sep 2004 03:26:36 -0700, [email]learning_c (AT) hotmail (DOT) com[/email] (learning_C++)
wrote in comp.lang.c++:

Rich Grise · Guest

On Sunday 26 September 2004 10:34 am, Jack Klein did deign to grace us with
the following: