On 01/14/2016 04:06 AM, André Hartmann wrote:
> Hello List,
>
> I have written a program which uses SocketCAN for CAN communication.
> The development takes place under Ubuntu Linux and compilation is fine
> there (also cross-compilation for an embedded ARM Linux).
>
> But when I compile my program under Scientific Linux 6.7, I get the
> following errors:
>
> "
> In file included from socket_can/receivethread.h:6,
>                   from socket_can/receivethread.c:4:
> /usr/include/linux/can.h:81: error: expected specifier-qualifier-list
> before 'sa_family_t'
> socket_can/receivethread.c: In function 'receivethread_init':
> socket_can/receivethread.c:52: error: 'struct sockaddr_can' has no
> member named 'can_family'
> socket_can/receivethread.c:53: error: 'struct sockaddr_can' has no
> member named 'can_ifindex'
> "
>
> Searching for the definition of sa_family_t gave a lot of usages,
> but no definition:
>
> $ cd /usr/include/linux
> $ grep -r sa_family_t
> llc.h:    sa_family_t     sllc_family;    /* AF_LLC */
> llc.h:    sa_family_t    sllc_arphrd;    /* ARPHRD_ETHER */
> llc.h:    unsigned char   __pad[__LLC_SOCK_SIZE__ - sizeof(sa_family_t)
> * 2 -
> rose.h:    sa_family_t    srose_family;
> rose.h:    sa_family_t    srose_family;
> x25.h:    sa_family_t       sx25_family;        /* Must be AF_X25 */
> if_pppox.h:       sa_family_t     sa_family;            /* address
> family, AF_PPPOX */
> if_pppox.h:    sa_family_t     sa_family;      /* address family,
> AF_PPPOX */
> in.h:  sa_family_t        sin_family;    /* Address family        */
> ax25.h:    sa_family_t    sax25_family;
> ipx.h:    sa_family_t    sipx_family;
> netlink.h:#include <linux/socket.h> /* for sa_family_t */
> netlink.h:    sa_family_t    nl_family;    /* AF_NETLINK    */
> can.h:    sa_family_t can_family;
> phonet.h:    sa_family_t spn_family;
> phonet.h:    __u8 spn_zero[sizeof(struct sockaddr) - sizeof(sa_family_t)
> - 3];
> un.h:    sa_family_t sun_family;    /* AF_UNIX */
> irda.h:    sa_family_t sir_family;   /* AF_IRDA */
> atalk.h:    sa_family_t      sat_family;
>
> If I add the typedef to socket.h, everything is fine until the next
> kernel update:
>
> typedef unsigned short sa_family_t;
>
> The system is:
>
> $ uname -a
> Linux sl67-x64 2.6.32-573.12.1.el6.x86_64 #1 SMP Tue Dec 15 08:24:23 CST
> 2015 x86_64 x86_64 x86_64 GNU/Linux
>
> Any opinion on this?
>
> Best regards,
> André

It looks like sa_family_t has been morphing over time.  In SL5, it is 
indeed defined in linux/socket.h.  In SL6 I find it defined in 
bits/sockaddr.h.  In SL7 it continues to be in bits/sockaddr.h, but 
there is also __kernel_sa_family_t defined in linux/socket.h.

Try adding bits/sockaddr.h to your includes.

-Mark