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dot_tmux/plugins/tmux-mem-cpu-load/openbsd/memory.cc

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+/* vim: tabstop=2 shiftwidth=2 expandtab textwidth=80 linebreak wrap
+ *
+ * Copyright 2012 Matthew McCormick
+ * Copyright 2015 Pawel 'l0ner' Soltys
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <sstream>
+#include <string>
+
+// Ugly fix to compilation on OpenBSD 5.6
+// these need to be before include sys/mount.h
+// and be in this exact order. Otherwise compiling on
+// OpenBSD 5.6 will fail with missing NGROUPS define
+// or missing gid_t typedefs
+#ifdef OPENBSD_WORKAROUND
+#include <sys/types.h> // typedefs
+#include <sys/param.h> // missing NGROUPS
+#include <sys/ucred.h>
+#else
+#include <sys/types.h>
+#endif
+
+#include <sys/mount.h> // VFS_* which we use to get cache
+#include <sys/sysctl.h>
+
+#include "error.h"
+#include "memory.h"
+#include "conversions.h"
+
+void mem_status( MemoryStatus & status )
+{
+  // These values are in bytes
+  int64_t total_mem = 0;
+  int64_t used_mem = 0;
+  int32_t free_mem = 0;
+  size_t size;
+
+  // get page size
+  static int hw_pagesize[] = { CTL_HW, HW_PAGESIZE };
+  int page_size = 0;
+  size = sizeof( page_size );
+  if( sysctl( hw_pagesize, 2, &page_size, &size, NULL, 0 ) < 0 )
+  {
+    error( "memory: error getting page size" );
+  }
+
+  // get vm memory stats
+  static int uvmexp_mib[] = { CTL_VM, VM_UVMEXP };
+  struct uvmexp uvmexp;
+  size = sizeof( uvmexp );
+  if( sysctl( uvmexp_mib, 2, &uvmexp, &size, NULL, 0 ) < 0 )
+  {
+    error( "memory: error getting vm memory stats" );
+  }
+
+  // In case we need it, this gets the cached memory (bcstats.numbufpages)
+  static int vm_bcstats[] = { CTL_VFS, VFS_GENERIC, VFS_BCACHESTAT };
+  struct bcachestats bcstats;
+  size = sizeof( bcstats );
+  if( sysctl( vm_bcstats, 3, &bcstats, &size, NULL, 0 ) < 0 )
+  {
+    error( "memory: error getting cached memory size" );
+  }
+
+  // calculations based on libgtop
+  used_mem = ( (uint64_t) uvmexp.npages - uvmexp.free ) << uvmexp.pageshift;
+  free_mem = ( (uint64_t) uvmexp.free ) << uvmexp.pageshift;
+
+  // from nagios-memory plugin
+  used_mem -= ( (uint64_t) bcstats.numbufpages ) << uvmexp.pageshift;
+  free_mem += ( (uint64_t) bcstats.numbufpages ) << uvmexp.pageshift;
+
+  // calculate total memory
+  total_mem = ( (uint64_t) uvmexp.npages ) << uvmexp.pageshift;
+
+  status.used_mem = convert_unit(static_cast< float >( used_mem ), MEGABYTES );
+  status.total_mem = convert_unit(static_cast< float >( total_mem ), MEGABYTES );
+}