linux socket help

[Robert Smith]

As you can tell by my code that I will post I am obviously new with linux
socket programming so to be to hard on me :)

When I run my little program I get this error:
Server: got connection from 192.168.0.5
recv: Transport endpoint is not connected.

I don't know what that means or why I am getting it.
I know the connection is made by the server: message.

My other end program is a VB program. When i uncomment out the appropriate
lines in the following code my VB app works just find for receiving
messages.

Thanks

 
/*
** server.c -- a stream socket server demo
*/
 
#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>
#include <string.h>
 
#define MYPORT 3490
 
#define BACKLOG 10
 
#define MAXDATASIZE 100
 
void sigchld_handler(int s)
{
while(wait(NULL) > 0);
}
 
int main(void)
{
int sockfd, new_fd;
struct sockaddr_in my_addr;
struct sockaddr_in their_addr;
int sin_size;
struct sigaction sa;
int yes=1;
char msg[200]={""};
int msgLen;
int numbytes;
char buf[MAXDATASIZE];
 
 
 
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;
my_addr.sin_port = htons(MYPORT);
my_addr.sin_addr.s_addr = INADDR_ANY;
memset(&(my_addr.sin_zero), '\0', 8);
 
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;
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_RESTART;
if (sigaction(SIGCHLD, &sa, NULL) == -1) {
perror("sigaction");
exit(1);
}
sin_size = sizeof(struct sockaddr_in);
if ((new_fd = accept(sockfd, (structsockaddr *)&their_addr,
&sin_size)) == -1)
{
perror("accept");
}
printf("server: got connection
from%s\n",inet_ntoa(their_addr.sin_addr));
while(1)
{
//    This code works great sending a message to my other VB
app
//*********************************************
//printf("Enter a message to sent: ");
//gets(msg);
//msgLen=strlen(msg);
//   if (send(new_fd, msg, msgLen, 0) ==-1)
//       perror("send");
//********************************************
 
//this is the code that doesnt work
//*********************************************************************
 
if ((numbytes=recv(sockfd, buf, MAXDATASIZE-1, 0)) ==-1)
{
perror("recv");
exit(1);
}
 
buf[numbytes] = '\0';
 
printf("Received: %s\n",buf);
 
}
//************************************************************************
return 0;
}
 
 
 

[CBFalconer]

Robert Smith wrote:

As you can tell by my code that I will post I am obviously new
with linux socket programming so to be to hard on me :)

When I run my little program I get this error:
Server: got connection from 192.168.0.5
recv: Transport endpoint is not connected.

I don't know what that means or why I am getting it.
I know the connection is made by the server: message.

My other end program is a VB program. When i uncomment out the
appropriate lines in the following code my VB app works just
find for receiving messages.

/*
** server.c -- a stream socket server demo
*/

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
Not a standard include file
#include <errno.h>
#include <string.h>
#include <sys/types.h>
Not a standard include file
#include <sys/socket.h>
Not a standard include file
#include <netinet/in.h>
Not a standard include file
#include <arpa/inet.h>
Not a standard include file
#include <sys/wait.h>
Not a standard include file
#include <signal.h>
#include <string.h>

With all those errors we cannot possibly understand your
non-portable code here. Try a newsgroup that deals with your
actual system.

--
"I'm a war president. I make decisions here in the Oval Office
in foreign policy matters with war on my mind." - Bush.
"If I knew then what I know today, I would still have invaded
Iraq. It was the right decision" - G.W. Bush, 2004-08-02

[Ash]

> if (bind(sockfd, (struct sockaddr *)&my_addr,sizeof(struct

sockaddr)== -1)
{
perror("bind");
exit(1);
}

Here the bind arguments are not proper. The third argument should
contain the size of the address structure whichis sizeof(my_addr).

[Dave Thompson]

On Sun, 05 Sep 2004 16:12:03 GMT, "Robert Smith" <no**@none.com>
wrote:

As you can tell by my code that I will post I am obviously new with linux
socket programming so to be to hard on me :)
Sockets, and (other) Linux specifics, are offtopic in clc, which deals
with standard/portable C. Try comp.unix.programming or (I think it is)
comp.os.linux.development.apps. But:
<snip> if ((new_fd = accept(sockfd, (structsockaddr *)&their_addr,
&sin_size)) == -1) <snip> // if (send(new_fd, msg, msgLen, 0) ==-1) <snip> if ((numbytes=recv(sockfd, buf, MAXDATASIZE-1, 0)) ==-1)

Think about which fd is which.

- David.Thompson1 at worldnet.att.net