Storage size of sockaddr_in variable isn't known

Question

I have a piece of code that used to work in some environment a long time ago. I'm pretty sure it was a FreeBSD machine so I got FreeBSD 8.3 and I'm trying to make this file but it's not working.

When I try to compile it it complains with:

f.c: In function 'tcp'>
f.c:24: error: storage size of 'socket_stru' isn't known
f.c:29: error: 'IPPROTO_TCP' undeclared (first use in this function)
...

I've been looking around and I see these are all specified in the sys/socket.h file. This is my actual file:

#include <stdio.h>
#include <string.h>
#include <netdb.h>
#include <sys/socket.h>
#include <unistd.h>


#include "f.h"

int tcp4 (in_addr_t ip, int port, int qsize )
{   
    struct sockaddr_in socket_stru; // line 24
    socket_stru.sin_family = AF_INET;
    socket_stru.sin_port = htons(port);
    socket_stru.sin_addr.s_addr = ip;

    int actual_socket = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP); // line 29
...

I feel like my code somehow doesn't "read" the sys/socket.h file so it doesn't know about socket_stru and IPPROTO_TCP, but I'm just really lost.

Any ideas?

Answer 1

None of the other answers worked for me. After taking a look inside the sys/socket.h file, I didn't even see a definition for struct sockaddr_in.

What worked for me was to #include one of the following files when using the corresponding struct sockaddr_* type:

• if you're using struct sockaddr_in, #include <netinet/in.h>
• if you're using struct sockaddr_un, #include <sys/un.h>
• if you're using struct sockaddr_ns, #include <netns/ns.h>
• if you're using struct sockaddr_ndd, #include <sys/ndd_var.h>

More information on the header files for socket programming can be found here.