nodeinfo: make freebsdNodeGetCPUCount work on Mac OS X

This fixes the following error:
  error : nodeGetInfo:933 : this function is not supported
  by the connection driver: node info not implemented on this platform

The freebsdNodeGetCPUCount was renamed to appleFreebsdNodeGetCPUCount
in order to make more visible the fact, that it works on Mac OS X too.

Mac OS X can use sysctlbyname as same as FreeBSD to get the CPU
frequency. However, the MIB style name is different from FreeBSD's.
And the unit of the return frequency is also different.
Signed-off-by: NRyota Ozaki <ozaki.ryota@gmail.com>
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

src/nodeinfo.c

@@ -38,7 +38,7 @@
 # include <numa.h>
 #endif
 
-#ifdef __FreeBSD__
+#if defined(__FreeBSD__) || defined(__APPLE__)
 # include <sys/types.h>
 # include <sys/sysctl.h>
 #endif
@@ -58,9 +58,9 @@
 
 #define VIR_FROM_THIS VIR_FROM_NONE
 
-#ifdef __FreeBSD__
+#if defined(__FreeBSD__) || defined(__APPLE__)
 static int
-freebsdNodeGetCPUCount(void)
+appleFreebsdNodeGetCPUCount(void)
 {
     int ncpu_mib[2] = { CTL_HW, HW_NCPU };
     unsigned long ncpu;
@@ -882,13 +882,13 @@ cleanup:
     VIR_FORCE_FCLOSE(cpuinfo);
     return ret;
     }
-#elif defined(__FreeBSD__)
+#elif defined(__FreeBSD__) || defined(__APPLE__)
     {
     nodeinfo->nodes = 1;
     nodeinfo->sockets = 1;
     nodeinfo->threads = 1;
 
-    nodeinfo->cpus = freebsdNodeGetCPUCount();
+    nodeinfo->cpus = appleFreebsdNodeGetCPUCount();
     if (nodeinfo->cpus == -1)
         return -1;
 
@@ -897,12 +897,21 @@ cleanup:
     unsigned long cpu_freq;
     size_t cpu_freq_len = sizeof(cpu_freq);
 
+# ifdef __FreeBSD__
     if (sysctlbyname("dev.cpu.0.freq", &cpu_freq, &cpu_freq_len, NULL, 0) < 0) {
         virReportSystemError(errno, "%s", _("cannot obtain CPU freq"));
         return -1;
     }
 
     nodeinfo->mhz = cpu_freq;
+# else
+    if (sysctlbyname("hw.cpufrequency", &cpu_freq, &cpu_freq_len, NULL, 0) < 0) {
+        virReportSystemError(errno, "%s", _("cannot obtain CPU freq"));
+        return -1;
+    }
+
+    nodeinfo->mhz = cpu_freq / 1000000;
+# endif
 
     /* get memory information */
     int mib[2] = { CTL_HW, HW_PHYSMEM };