🚀 go-pugleaf

MSF wrote:
> Hi
> 
> I've just started programing, using C language and UDP Sockets (in Linux);
> (so I have a few problems)
> 
> 
> I have two programs (client and server);
>     -Client send (interactive) request information about server network
> configuration (/sbin/ifconfig)
> 
>         -Server
>                 if(!strcasecmp(dgram,"interface")){
>           should do this request
>                 system("/sbin/ifconfig")
>            and send it to client
>                 ??????? HOW ??????
> 
> Simple use
>             variable1 = system("/sbin/ifconfig")
>             sprintf("%s",variable1)
>  doesn't work (problem with buffer, even I set it bigger),
>   if I change sprintf into printf - information about network configuration
>     will be appear on server screen - of course,
> 
>     but how send it to Client?
> (maybe first write to file, and then to buffer - gradually, after this send
> it to Client
>  - if it's good idea - how write it?

First of all, this is not a good place to post questions in English...

Well, after that... no estas usando bien la funci�n "system", su 
declaraci�n es:

int system(const char *string);

�sta funci�n ejecuta un int�rprete de comandos, generalmente /bin/sh y 
le pasa el comando entregado en la cadena "string". Una vez ejecutado, 
devuelve un "int" con el estado de finalizaci�n de la ejecuci�n (NO UN 
PUNTERO A CADENA).

Todo lo que el comando "system" saca por la salida est�ndar, saldr� por 
la salida est�ndar, y no ser� puesto en ninguna cadena.

Posible soluci�n:
lo que dices de escribir al fichero puede funcionar:

1. Primero escribe al fichero
2. Luego, lee y manda

Algo as�:

-----8<----------------------

FILE *file;
char buffer[512];
int i;

(...)

system("/sbin/ifconfig > /tmp/ifconfig.txt");

file = fopen("/tmp/ifconfig.txt", "r");


for (i=0; fread(buffer, sizeof(char), 512, file)==512 ; i+=512)
{
    sendto(socket, buffer, 512*sizeof(char), 0,
	&Client_address, sizeof(struct sockaddr));
}

close(socket);
fclose(file);

(...)

-------8<-------------------

Mejor si le a�ades tratamiento de errores y esas cosas...