From ce8d5c66abfd3ef153e47381405ab88d97e60134 Mon Sep 17 00:00:00 2001
From: iceman1001 <iceman@iuse.se>
Date: Thu, 25 Apr 2019 08:29:15 +0200
Subject: [PATCH] fix https://github.com/RfidResearchGroup/proxmark3/issues/173

this seems to work for OSX,  and improved linux version with fallback.
---
 client/util.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/client/util.c b/client/util.c
index b14023067..3c7ef4ba0 100644
--- a/client/util.c
+++ b/client/util.c
@@ -866,9 +866,18 @@ int num_CPUs(void) {
     SYSTEM_INFO sysinfo;
     GetSystemInfo(&sysinfo);
     return sysinfo.dwNumberOfProcessors;
-#elif defined(__linux__) || defined(__APPLE__)
+#elif defined(__linux__) && defined(_SC_NPROCESSORS_ONLN)
 #include <unistd.h>
-    return sysconf(_SC_NPROCESSORS_ONLN);
+    int count = sysconf(_SC_NPROCESSORS_ONLN);
+    if (count <= 0) 
+        count = 1;
+    return count;   
+#elif defined(__APPLE__)
+#include "sys/sysctl.h"
+    uint32 logicalcores = 0;
+    size_t size = sizeof( logicalcores );
+    sysctlbyname( "hw.logicalcpu", &logicalcores, &size, NULL, 0 );
+    return logicalcores;
 #else
     return 1;
 #endif