Question

I’m trying to create socket, and I should describe some structures:

(struct in_addr) addr;
addr.s_addr = INADDR_ANY;

also I have included headers

#include <sys/socket.h>
#include <sys/types.h>

But gcc says that there is an error:

error: ‘addr’ undeclared (first use in this function)

What am I doing wrong?

Answer 1

To declare a new in_addr struct, you need to remove those parentheses:

struct in_addr addr;
addr.s_addr = INADDR_ANY;

What you have at the moment is a cast, which means (approx.) “assuming addr is already a declared variable of some other type, try to convert it to a struct in_addr“.