SunOS: support memory usage detection

CMakeLists.txt

@@ -781,7 +781,7 @@ elseif(SunOS)
         src/detection/localip/localip_linux.c
         src/detection/gamepad/gamepad_nosupport.c
         src/detection/media/media_linux.c
-        src/detection/memory/memory_nosupport.c
+        src/detection/memory/memory_sunos.c
         src/detection/monitor/monitor_nosupport.c
         src/detection/netio/netio_nosupport.c
         src/detection/opengl/opengl_linux.c

src/detection/memory/memory_sunos.c

@@ -0,0 +1,34 @@
+#include "memory.h"
+#include <kstat.h>
+
+static inline void kstatFreeWrap(kstat_ctl_t** pkc)
+{
+    assert(pkc);
+    if (*pkc)
+        kstat_close(*pkc);
+}
+
+const char* ffDetectMemory(FFMemoryResult* ram)
+{
+    __attribute__((__cleanup__(kstatFreeWrap))) kstat_ctl_t* kc = kstat_open();
+    if (!kc)
+        return "kstat_open() failed";
+
+    kstat_t* ks = kstat_lookup(kc, "unix", -1, "system_pages");
+    if (!ks)
+        return "kstat_lookup() failed";
+
+    if (kstat_read(kc, ks, NULL) < 0)
+        return "kstat_read() failed";
+
+    {
+        kstat_named_t* kn = kstat_data_lookup(ks, "pagestotal");
+        ram->bytesTotal = kn->value.ui64 * instance.state.platform.pageSize;
+    }
+    {
+        kstat_named_t* kn = kstat_data_lookup(ks, "pagesfree");
+        ram->bytesUsed = ram->bytesTotal - kn->value.ui64 * instance.state.platform.pageSize;
+    }
+
+    return NULL;
+}