OpenBSD patches for base and build, part 2

base/sys_info_openbsd.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/sys_info.h"
 
 #include <sys/param.h>
+#include <sys/shm.h>
 #include <sys/sysctl.h>
 
 #include "base/logging.h"
 
 namespace base {
 
 int SysInfo::NumberOfProcessors() {
   int mib[] = { CTL_HW, HW_NCPU };
   int ncpu;
   size_t size = sizeof(ncpu);
-  if (sysctl(mib, 2, &ncpu, &size, NULL, 0) == -1) {
+  if (sysctl(mib, arraysize(mib), &ncpu, &size, NULL, 0) == -1) {
     NOTREACHED();
     return 1;
   }
   return ncpu;
 }
 
 int64 SysInfo::AmountOfPhysicalMemory() {
   long pages = sysconf(_SC_PHYS_PAGES);
   long page_size = sysconf(_SC_PAGESIZE);
   if (pages == -1 || page_size == -1) {
     NOTREACHED();
     return 0;
   }
 
   return static_cast<int64>(pages) * page_size;
 }
 
+size_t SysInfo::MaxSharedMemorySize() {
+  int mib[] = { CTL_KERN, KERN_SHMINFO, KERN_SHMINFO_SHMMAX };
+  size_t limit;
+  size_t size = sizeof(limit);
+  if (sysctl(mib, arraysize(mib), &limit, &size, NULL, 0) < 0) {
+    NOTREACHED();
+    return 0;
+  }
+  return limit;
+}
+
 }  // namespace base