‘sockaddr_in6_t’ undeclared error even after inclusing the header files

Question

I have following simple piece of code, which is a part of ipv6 handling module in a big project.

#include <ctype.h>
#include <sys/select.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <net/if.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <sys/stat.h>

int main(){
  sockaddr_in6_t* pSadrIn6 = (sockaddr_in6_t*) malloc(sizeof sockaddr_in6_t);
  return 0;
}

It gives me following not error:

error: ‘sockaddr_in6_t’ undeclared (first use in this function)

Is there any special library installation or linking that I need to access the library?

Try using `struct sockaddr_in6*` instead of `sockaddr_in6_t*` to see if you're just missing the `typedef` — Seth Carnegie, Dec 19 '11 at 00:01

score 3 · Accepted Answer · answered Dec 19 '11 at 00:03

It looks like you copied this code from the Linux IPv6 HOWTO but didn't copy the additional typedefs:

/*
** Type definitions (for convenience).
*/
typedef enum { false = 0, true } boolean;
typedef struct sockaddr_in       sockaddr_in_t;
typedef struct sockaddr_in6      sockaddr_in6_t;

Personally I would just use the types as they are (instead of extra typedefs to avoid typing struct), but whatever

‘sockaddr_in6_t’ undeclared error even after inclusing the header files

1 Answers1