non blocking operation

hi, i'm new on the C/C++ scene.
i want to make a socket listen & accept procedure during getch()
the problem is that both of them are blocking methods.
i know about select function, but i didn't manage to get it work (maybe because getch() is blocking it)

the idea is to make UI to the user, and simultaniously accept remote connections.

Code:

...
...
void listener(int port) {
     struct timeval tv = { 0L, 0L };
     fd_set acc;
     int s,siz;
     struct sockaddr_in m,remote;
     s = socket(AF_INET,SOCK_STREAM,0);
     m.sin_family = AF_INET;   
     m.sin_port = htons(port);
     m.sin_addr.s_addr = INADDR_ANY; 
     memset(&(m.sin_zero), '\0', 8);  
     printf("asd");     
     bind(s, (struct sockaddr *)&m, sizeof(struct sockaddr));
     listen(s,5);

     FD_ZERO(&acc);
     FD_SET(s, &acc);

     printf("%d",select(1, &acc, NULL, NULL, &tv)); // tried to debug and see the output, always equals 0

     while(!select(1, &acc, NULL, NULL, &tv)) {
     siz=sizeof(struct sockaddr); 

     accept(s, (struct sockaddr *)&remote, &siz); 
     printf("accepted connection from %s",inet_ntoa(remote.sin_addr));

       }
     
     }
...
...
int main() {
...
...
 x:         listener(123);
                    printf("Press computer number to perform tasks, r to check connections or q to quit.\n");
                    
         inp = getch();
         switch(inp) {
...
...
...
 goto x;
...
}

thanks

You could add "stdin" as one of the select set - and then check if it was your socket or stdin that got ready.

--
Mats

stdin is 0 file descriptor, isn't it?
the select returns error (-1), and WSA error is 10038 (invalid socket).
i'm working under windows XP SP2.

Originally Posted by Alon

stdin is 0 file descriptor, isn't it?
the select returns error (-1), and WSA error is 10038 (invalid socket).
i'm working under windows XP SP2.

Ah, ok, I though you used Linux - in Windows, you will have to do "somthing else". A non-blocking keyboard read will be what you want. I'm pretty sure there is such a thing in the console functions somewhere.

--
Mats

Yeah, windows broken select() only works on actual socket fd's, not any valid fd in the system.