Add support for querying the amount of memory on a system to sys_info.
Review URL: http://codereview.chromium.org/2927
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@2303 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/base/sys_info_posix.cc b/base/sys_info_posix.cc
index 093e607..a9a91cd 100644
--- a/base/sys_info_posix.cc
+++ b/base/sys_info_posix.cc
@@ -3,12 +3,17 @@
// found in the LICENSE file.
#include "base/sys_info.h"
+#include "base/basictypes.h"
#include <errno.h>
#include <string.h>
#include <unistd.h>
-#include "base/basictypes.h"
+#if defined(OS_MACOSX)
+#include <mach/mach_host.h>
+#include <mach/mach_init.h>
+#endif
+
#include "base/logging.h"
namespace base {
@@ -25,4 +30,33 @@
return static_cast<int>(res);
}
+// static
+int64 SysInfo::AmountOfPhysicalMemory() {
+ // _SC_PHYS_PAGES is not part of POSIX and not available on OS X
+#if defined(OS_MACOSX)
+ struct host_basic_info hostinfo;
+ mach_msg_type_number_t count = HOST_BASIC_INFO_COUNT;
+ int result = host_info(mach_host_self(),
+ HOST_BASIC_INFO,
+ reinterpret_cast<host_info_t>(&hostinfo),
+ &count);
+ DCHECK_EQ(HOST_BASIC_INFO_COUNT, count);
+ if (result != KERN_SUCCESS) {
+ NOTREACHED();
+ return 0;
+ }
+
+ return static_cast<int64>(hostinfo.max_mem);
+#else
+ long pages = sysconf(_SC_PHYS_PAGES);
+ long page_size = sysconf(_SC_PAGE_SIZE);
+ if (pages == -1 || page_size == -1) {
+ NOTREACHED();
+ return 0;
+ }
+
+ return static_cast<int64>(pages) * page_size;
+#endif
+}
+
} // namespace base
