macros - How to share same header files between kernel modules and userspace applications. -


i want implement simple module in ioctl() method used. in kernel module, use kernel macros, such _io(), _iowr(), etc., define own ioctl sub-commands. in facts, don't care actual values of these definitions use these macros instead of actual values .

when programmers in userspace want invoke ioctl() function, however, needs know either actual values or macro definitions of such sub-commands.

i guess, in userspace, won't such _io(), _iowr() macro definitions, so, how can export these definitions userspace application programmers.

the _io , _iowr (and forth) macros available in user-space headers. definitions can pulled both kernel-space , user-space source #including <linux/ioctl.h> first.

you should separate kernel header files 2 parts: (a) needed kernel code -- struct definitions, inter-source-file declarations, other #includes, or else find convenient include there isn't needed user-space -- , (b) define interface between kernel , user-space. latter contain _io* definitions , may include custom structure definitions used transmit information in ioctls user-space kernel.

then you'll need arrange strategy share interface-defining header file between kernel , user-space code.


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