I don't think ioctls.h is a good place looking for the subsystem id calculation, instead hurd/ioctls.defs, it contains the following codes:
``` /* Calculate the MiG subsystem (i.e. first message ID) for the RPCs produced by ioctl requests in the given group. */ #define IOC_GROUP_SUBSYSTEM(group) (100000 + ((group) - 'f') * 4000) ``` --- hurd/iioctl.defs | 4 ++-- hurd/kdioctl.defs | 4 ++-- hurd/rioctl.defs | 4 ++-- hurd/tioctl.defs | 4 ++-- 4 files changed, 8 insertions(+), 8 deletions(-) diff --git a/hurd/iioctl.defs b/hurd/iioctl.defs index 58b7dbab..30087fea 100644 --- a/hurd/iioctl.defs +++ b/hurd/iioctl.defs @@ -17,8 +17,8 @@ You should have received a copy of the GNU General Public License along with the GNU Hurd; see the file COPYING. If not, write to the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ -/* Ioctl class `i'; the subsystem is derived from calculations in - <ioctls.h>. */ +/* Ioctl class `i'; the subsystem is derived from IOC_GROUP_SUBSYSTEM in + hurd/ioctls.defs. */ subsystem iioctl 112000; /* XXX */ #include <hurd/ioctl_types.defs> diff --git a/hurd/kdioctl.defs b/hurd/kdioctl.defs index 0dd09d38..88f69496 100644 --- a/hurd/kdioctl.defs +++ b/hurd/kdioctl.defs @@ -17,8 +17,8 @@ You should have received a copy of the GNU General Public License along with the GNU Hurd; see the file COPYING. If not, write to the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ -/* Ioctl class `k'; the subsystem is derived from calculations in - <ioctls.h>. */ +/* Ioctl class `k'; the subsystem is derived from IOC_GROUP_SUBSYSTEM in + hurd/ioctls.defs. */ subsystem kdioctl 120000; #include <hurd/hurd_types.defs> diff --git a/hurd/rioctl.defs b/hurd/rioctl.defs index e04fe6b3..880c087a 100644 --- a/hurd/rioctl.defs +++ b/hurd/rioctl.defs @@ -18,8 +18,8 @@ along with the GNU Hurd; see the file COPYING. If not, write to the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ -/* Ioctl class `r'; the subsystem is derived from calculations in - <ioctls.h>. */ +/* Ioctl class `r'; the subsystem is derived from IOC_GROUP_SUBSYSTEM in + hurd/ioctls.defs. */ subsystem rioctl 148000; /* XXX */ #include <hurd/ioctl_types.defs> diff --git a/hurd/tioctl.defs b/hurd/tioctl.defs index 905a4a38..74af62e2 100644 --- a/hurd/tioctl.defs +++ b/hurd/tioctl.defs @@ -17,8 +17,8 @@ You should have received a copy of the GNU General Public License along with the GNU Hurd; see the file COPYING. If not, write to the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ -/* Ioctl class `t'; the subsystem is derived from calculations in - <ioctls.h>. */ +/* Ioctl class `t'; the subsystem is derived from IOC_GROUP_SUBSYSTEM in + hurd/ioctls.defs. */ subsystem tioctl 156000; /* XXX */ #include <hurd/hurd_types.defs> -- 2.47.0
