Socket programming

Hi All,

I was written small network utility in Linux 2.6, glibc 2.7.
I have been using send() and recv() system call in SOCK_STREAM
to send or receive fixed size data. for example, i write my data 
structure like this:

struct foo
{
  char name[16];
  char pix[1024];
  int id;
} bar;

If i want to send or receive data i just call

send (socket, &bar, sizeof(struct foo), 0);

or to receive:
recv (socket, &bar, sizeof(struct foo), 0);

My problem is how to receive dynamic sized data? for 
example this structure:

struct foo
{
  char *name;
  char *pix;
  int id;
}

struct foo *bar = malloc (sizeof(struct foo));
/* fill the structure, then send */

How to receive the data? since there are no way
to the receiver to know data sizes?

Thanks for your help.


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