1 files changed, 27 insertions, 9 deletions

diff --git a/free.c b/free.c
index a81189be9..997430b39 100644
--- a/free.c
+++ b/free.c
@@ -23,20 +23,36 @@
 
 #include "internal.h"
 #include <stdio.h>
-#include <sys/sysinfo.h>
+#include <errno.h>
+
 
-#define DIVISOR 1024
 extern int free_main(int argc, char **argv)
 {
         struct sysinfo info;
         sysinfo(&info);
-        info.totalram/=DIVISOR;
-        info.freeram/=DIVISOR;
-        info.totalswap/=DIVISOR;
-        info.freeswap/=DIVISOR;
-        info.sharedram/=DIVISOR;
-        info.bufferram/=DIVISOR;
-
+        /* Kernels prior to 2.4.x will return info.mem_unit==0.  Kernels after
+         * 2.4.x actually fill this value in */
+        if (info.mem_unit==0) {
+                /* Looks like we have a kernel prior to Linux 2.4.x */
+                info.mem_unit=1024;
+                info.totalram/=info.mem_unit;
+                info.freeram/=info.mem_unit;
+                info.totalswap/=info.mem_unit;
+                info.freeswap/=info.mem_unit;
+                info.sharedram/=info.mem_unit;
+                info.bufferram/=info.mem_unit;
+        } else {
+                /* Bah. Linux 2.4.x completely changed sysinfo. This can in theory
+                overflow a 32 bit unsigned long, but who puts more then 4GiB ram+swap
+                on an embedded system? */
+                info.mem_unit/=1024;
+                info.totalram*=info.mem_unit;
+                info.freeram*=info.mem_unit;
+                info.totalswap*=info.mem_unit;
+                info.freeswap*=info.mem_unit;
+                info.sharedram*=info.mem_unit;
+                info.bufferram*=info.mem_unit;
+        }
         if (argc > 1 && **(argv + 1) == '-') {
                 usage("free\n"
 #ifndef BB_FEATURE_TRIVIAL_HELP
@@ -61,3 +77,5 @@ extern int free_main(int argc, char **argv)
                         info.freeram+info.freeswap);
         return(TRUE);
 }
+
+