Hi everybody,
My server program shows "Invalid argument" in connect() call.

Server Code :

#include<string.h>
#include<stdio.h>
#include<stdlib.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<arpa/inet.h>

#define MYPORT 7777
#define backlog 5

int main()
{
int sid,sockfd,sin_size,new_fd,n;
struct sockaddr_in own;
struct sockaddr_in their_addr;
char msg[256];
socklen_t len;
sid=socket(AF_INET,SOCK_STREAM,0);
perror("Socket creation");

own.sin_family=AF_INET;
own.sin_port=htons(MYPORT);
own.sin_addr.s_addr=htonl(INADDR_ANY);
memset(&their_addr,0,sizeof(their_addr));
sockfd= bind(sid,(struct sockaddr *)&own,sizeof(struct
sockaddr_in));
perror("Bind ");

listen(sockfd,backlog);
perror("Listen ");
len=sizeof(struct sockaddr_in);
new_fd=accept(sid,(struct sockaddr *)&their_addr,&len);
perror("Accept ");

while(1) {
memset(msg,0,sizeof(msg));
n=read(new_fd,msg,255);
printf("\n Read bytes : %d \n",n);
sleep(1);
if(n > 0)
printf("\n Received message : %s ",msg);
}
close(new_fd);
close(sid);
}


Can anybody help me on this???

Thanks in advance,
-Sethu

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sethukr@gmail.com wrote:
> Hi everybody,
> My server program shows "Invalid argument" in connect() call.

Hmmm, your code doesn't contain a connect() call.


> Server Code :
>
> #include<string.h>
> #include<stdio.h>
> #include<stdlib.h>
> #include<sys/types.h>
> #include<sys/socket.h>
> #include<netinet/in.h>
> #include<arpa/inet.h>
>
> #define MYPORT 7777
> #define backlog 5
>
>  int main()
> {
>         int sid,sockfd,sin_size,new_fd,n;
>         struct sockaddr_in own;
>         struct sockaddr_in their_addr;
>         char msg[256];
>         socklen_t len;
>         sid=socket(AF_INET,SOCK_STREAM,0);
>                 perror("Socket creation");
>

Always a good idea to memset(&own,0,sizeof(own));

>         own.sin_family=AF_INET;
>         own.sin_port=htons(MYPORT);
>         own.sin_addr.s_addr=htonl(INADDR_ANY);
>         memset(&their_addr,0,sizeof(their_addr));
>         sockfd= bind(sid,(struct sockaddr *)&own,sizeof(struct
> sockaddr_in));

NO NO NO
bind() doesn't return a socket-fd ... it just returns
error or success ... man 2 bind

>                 perror("Bind ");
>
>         listen(sockfd,backlog);

So, this should read listen(sid,backlog);

>                 perror("Listen ");
>         len=sizeof(struct sockaddr_in);
>         new_fd=accept(sid,(struct sockaddr *)&their_addr,&len);

This call is causing an error, because the listen() call
was made on an invalid filedescriptor.

... rest of code zapped.

Rainer

[ Post a follow-up to this message ]

On Feb 26, 5:50 pm, Rainer Temme <Rainer_Te...@nospam.hotmail_dot_com>
wrote:
> seth...@gmail.com wrote: 
>
> Hmmm, your code doesn't contain a connect() call.
>
>
> 
> 
> 
> 
>
> Always a good idea to memset(&own,0,sizeof(own));
> 
>
> NO NO NO
> bind() doesn't return a socket-fd ... it just returns
> error or success ... man 2 bind
> 
> 
>
> So, this should read listen(sid,backlog);
> 
>
> This call is causing an error, because the listen() call
> was made on an invalid filedescriptor.
>
> ... rest of code zapped.
>
> Rainer

oh.  thank you very much
-Sethu

[ Post a follow-up to this message ]

"sethukr@gmail.com" <sethukr@gmail.com> writes:

[...]

>  int main()
> {
>         int sid,sockfd,sin_size,new_fd,n;
>         struct sockaddr_in own;
>         struct sockaddr_in their_addr;
>         char msg[256];
>         socklen_t len;
>         sid=socket(AF_INET,SOCK_STREAM,0);
>                 perror("Socket creation");
>
>         own.sin_family=AF_INET;
>         own.sin_port=htons(MYPORT);
>         own.sin_addr.s_addr=htonl(INADDR_ANY);

>         memset(&their_addr,0,sizeof(their_addr));

The memset has no technical purpose.

>         sockfd= bind(sid,(struct sockaddr *)&own,sizeof(struct
> sockaddr_in));
>                 perror("Bind ");
>
>         listen(sockfd,backlog);
>                 perror("Listen ");
>         len=sizeof(struct sockaddr_in);
>         new_fd=accept(sid,(struct sockaddr *)&their_addr,&len);
>                perror("Accept ");
>
>         while(1) {
>         memset(msg,0,sizeof(msg));

And this memset hasn't, either.

[ Post a follow-up to this message ]

On 2=D4=C226=C8=D5, =CF=C2=CE=E78=CA=B135=B7=D6, "seth...@gmail.com" <seth.=
.=2E@gmail.com> wrote:
> Hi everybody,
> My server program shows "Invalid argument" in connect() call.
>
> Server Code :
>
> #include<string.h>
> #include<stdio.h>
> #include<stdlib.h>
> #include<sys/types.h>
> #include<sys/socket.h>
> #include<netinet/in.h>
> #include<arpa/inet.h>
>
> #define MYPORT 7777
> #define backlog 5
>
>  int main()
> {
>         int sid,sockfd,sin_size,new_fd,n;
>         struct sockaddr_in own;
>         struct sockaddr_in their_addr;
>         char msg[256];
>         socklen_t len;
>         sid=3Dsocket(AF_INET,SOCK_STREAM,0);
>                 perror("Socket creation");
>
>         own.sin_family=3DAF_INET;
>         own.sin_port=3Dhtons(MYPORT);
>         own.sin_addr.s_addr=3Dhtonl(INADDR_ANY);
>         memset(&their_addr,0,sizeof(their_addr));
>         sockfd=3D bind(sid,(struct sockaddr *)&own,sizeof(struct
> sockaddr_in));

Bind's meaning is just like its name. It establishes a map between the
machine-entry(IP + PORT/UNIX domain socket path) and your process
using the fd returned from socket(). So only applications that need
input data need to do bind().
>                 perror("Bind ");
>
>         listen(sockfd,backlog);
>                 perror("Listen ");
>         len=3Dsizeof(struct sockaddr_in);
>         new_fd=3Daccept(sid,(struct sockaddr *)&their_addr,&len);
>                perror("Accept ");
>
>         while(1) {
>         memset(msg,0,sizeof(msg));
>         n=3Dread(new_fd,msg,255);
>         printf("\n Read bytes : %d \n",n);
>         sleep(1);
>         if(n > 0)
>                 printf("\n Received message : %s ",msg);
>         }
>         close(new_fd);
>         close(sid);
>
> }
>
> Can anybody help me on this???
>
> Thanks in advance,
> -Sethu

[ Post a follow-up to this message ]

On Feb 26, 1:35 pm, "seth...@gmail.com" <seth...@gmail.com> wrote:
> Hi everybody,
> My server program shows "Invalid argument" in connect() call.
>
> Server Code :
>
> #include<string.h>
> #include<stdio.h>
> #include<stdlib.h>
> #include<sys/types.h>
> #include<sys/socket.h>
> #include<netinet/in.h>
> #include<arpa/inet.h>
>
> #define MYPORT 7777
> #define backlog 5
>
>  int main()
> {
>         int sid,sockfd,sin_size,new_fd,n;
>         struct sockaddr_in own;
>         struct sockaddr_in their_addr;
>         char msg[256];
>         socklen_t len;
>         sid=socket(AF_INET,SOCK_STREAM,0);
>                 perror("Socket creation");
>
>         own.sin_family=AF_INET;
>         own.sin_port=htons(MYPORT);
>         own.sin_addr.s_addr=htonl(INADDR_ANY);
>         memset(&their_addr,0,sizeof(their_addr));
>         sockfd= bind(sid,(struct sockaddr *)&own,sizeof(struct
> sockaddr_in));
>                 perror("Bind ");
>
>         listen(sockfd,backlog);
>                 perror("Listen ");
>         len=sizeof(struct sockaddr_in);
>         new_fd=accept(sid,(struct sockaddr *)&their_addr,&len);
>                perror("Accept ");
>
>         while(1) {
>         memset(msg,0,sizeof(msg));
>         n=read(new_fd,msg,255);
>         printf("\n Read bytes : %d \n",n);
>         sleep(1);
>         if(n > 0)
>                 printf("\n Received message : %s ",msg);
>         }
>         close(new_fd);
>         close(sid);
>
> }
>
> Can anybody help me on this???
Why did you post this twice under different subjects ("Error in Socket
program") if I may ask?
--
WYCIWYG - what you C is what you get

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