[sys/info] Move macOS sysctl to sys/unix.

core/sys/unix/sysctl_darwin.odin

@@ -0,0 +1,43 @@
+//+build darwin
+package unix
+
+import "core:sys/darwin"
+import "core:intrinsics"
+
+sysctl :: proc(mib: []i32, val: ^$T) -> (ok: bool) {
+	mib := mib
+	result_size := i64(size_of(T))
+
+	res := intrinsics.syscall(
+		darwin.unix_offset_syscall(.sysctl),
+		uintptr(raw_data(mib)), uintptr(len(mib)),
+		uintptr(val), uintptr(&result_size),
+		uintptr(0), uintptr(0),
+	)
+	return res == 0
+}
+
+// See sysctl.h for darwin for details
+CTL_KERN    :: 1
+	KERN_OSTYPE    :: 1  // Darwin
+	KERN_OSRELEASE :: 2  // 21.5.0 for 12.4 Monterey
+	KERN_OSREV     :: 3  // i32: system revision
+	KERN_VERSION   :: 4  // Darwin Kernel Version 21.5.0: Tue Apr 26 21:08:22 PDT 2022; root:darwin-8020.121.3~4/RELEASE_X86_64
+	KERN_OSRELDATE :: 26 // i32: OS release date
+	KERN_OSVERSION :: 65 // Build number, e.g. 21F79
+CTL_VM      :: 2
+CTL_VFS     :: 3
+CTL_NET     :: 4
+CTL_DEBUG   :: 5
+CTL_HW      :: 6
+	HW_MACHINE      :: 1  // x86_64
+	HW_MODEL        :: 2  // MacbookPro14,1
+	HW_NCPU         :: 3  /* int: number of cpus */
+	HW_BYTEORDER    :: 4  /* int: machine byte order */
+	HW_MACHINE_ARCH :: 12 /* string: machine architecture */
+	HW_VECTORUNIT   :: 13 /* int: has HW vector unit? */
+	HW_MEMSIZE      :: 24 // u64
+	HW_AVAILCPU     :: 25 /* int: number of available CPUs */
+
+CTL_MACHDEP :: 7
+CTL_USER    :: 8