> On Sep 12, 2017, at 6:34 PM, Stefan Hajnoczi <stefa...@redhat.com> wrote:
>
> This patch fixes the following compiler errors when userspace
> applications use the vm_sockets.h header:
>
> include/uapi/linux/vm_sockets.h:148:32: error: invalid application of
> ‘sizeof’ to incomplete type ‘struct sockaddr’
> unsigned char svm_zero[sizeof(struct sockaddr) -
> ^~~~~~
> include/uapi/linux/vm_sockets.h:149:18: error: ‘sa_family_t’ undeclared here
> (not in a function)
> sizeof(sa_family_t) -
> ^~~~~~~~~~~
>
> Two issues:
> 1. In the kernel struct sockaddr comes in via <linux/socket.h> but in
> userspace <sys/socket.h> is required.
> 2. struct sockaddr_vm has a __kernel_sa_family_t field so let's be
> consistent and use the same type for the sizeof(sa_family_t)
> calculation.
>
> Currently userspace applications work around this broken header by first
> including <sys/socket.h>. In the kernel there is no compiler error
> because <linux/socket.h> provides everything. It's worth fixing the
> header file though.
>
> Cc: Jorgen Hansen <jhan...@vmware.com>
> Signed-off-by: Stefan Hajnoczi <stefa...@redhat.com>
> ---
> include/uapi/linux/vm_sockets.h | 6 +++++-
> 1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/include/uapi/linux/vm_sockets.h b/include/uapi/linux/vm_sockets.h
> index b4ed5d895699..4ae5c625ac56 100644
> --- a/include/uapi/linux/vm_sockets.h
> +++ b/include/uapi/linux/vm_sockets.h
> @@ -18,6 +18,10 @@
>
> #include <linux/socket.h>
>
> +#ifndef __KERNEL__
> +#include <sys/socket.h> /* struct sockaddr */
> +#endif
> +
> /* Option name for STREAM socket buffer size. Use as the option name in
> * setsockopt(3) or getsockopt(3) to set or get an unsigned long long that
> * specifies the size of the buffer underlying a vSockets STREAM socket.
> @@ -146,7 +150,7 @@ struct sockaddr_vm {
> unsigned int svm_port;
> unsigned int svm_cid;
> unsigned char svm_zero[sizeof(struct sockaddr) -
> - sizeof(sa_family_t) -
> + sizeof(__kernel_sa_family_t) -
> sizeof(unsigned short) -
> sizeof(unsigned int) - sizeof(unsigned int)];
> };
> --
> 2.13.5
>
Thanks for fixing this.
Reviewed-by: Jorgen Hansen <jhan...@vmware.com>
