Dear Mark,
thanks for your investigation.
Indeed, I had included linux/can.h before sys/socket.h (which includes
bits/sockaddr.h, and should *not* be included directly) so the compiler
struggled.
After swapping the include lines, and including sys/socket.h before
linux/can.h, it compiles fine.
So again, many thanks!
Best regards,
André
Am 14.01.2016 um 15:33 schrieb Mark Stodola:
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_tsllc_arphrd;/* ARPHRD_ETHER */
llc.h:unsigned char __pad[__LLC_SOCK_SIZE__ - sizeof(sa_family_t)
* 2 -
rose.h:sa_family_tsrose_family;
rose.h:sa_family_tsrose_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_tsin_family;/* Address family*/
ax25.h:sa_family_tsax25_family;
ipx.h:sa_family_tsipx_family;
netlink.h:#include /* for sa_family_t */
netlink.h:sa_family_tnl_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