Re: [PATCH] Detect GNU/kFreeBSD in user-visible kernel headers
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On Tue, Nov 22, 2011 at 11:35:15AM +0200, Kostik Belousov wrote:
> I am fine with __FreeBSD_kernel being empty, please submit the patch.
Here.
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Robert Millan
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Index: sys/sys/param.h
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
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--- sys/sys/param.h (revision 227580)
+++ sys/sys/param.h (working copy)
@@ -60,6 +60,22 @@
#undef __FreeBSD_version
#define __FreeBSD_version 1000001 /* Master, propagated to newvers */
=20
+/*
+ * __FreeBSD_kernel__ indicates that this system uses the kernel of FreeBS=
D,
+ * which by definition is always true on FreeBSD. This macro is also defin=
ed
+ * on other systems that use the kernel of FreeBSD, such as GNU/kFreeBSD
+ *
+ * It is tempting to use this macro in userland code when we want to enable
+ * kernel-specific routines, and in fact it's fine to do this in code that
+ * is part of FreeBSD itself. However, be aware that as presence of this
+ * macro is still not widespread (e.g. older FreeBSD versions, 3rd party
+ * compilers, etc), it is STRONGLY DISCOURAGED to check for this macro in
+ * external applications without also checking for __FreeBSD__ as an
+ * alternative.
+ */
+#undef __FreeBSD_kernel__
+#define __FreeBSD_kernel__
+
#ifdef _KERNEL
#define P_OSREL_SIGWAIT 700000
#define P_OSREL_SIGSEGV 700004
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