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dot_tmux/plugins/tmux-mem-cpu-load/common/getsysctl.h

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+/*
+ * Copyright 2012 Matthew McCormick
+ * Copyright 2013 Justin Crawford <Justasic@gmail.com>
+ * 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.
+ */
+
+// Based on: github.com/freebsd/freebsd/blob/master/usr.bin/top/machine.c
+// Based on: Apple.cpp for load_string/mem_string and apple's documentation
+
+#ifndef BSD_METER_COMMON_H_
+#define BSD_METER_COMMON_H_
+
+#include <iostream>
+#include <cerrno>
+#include <sys/sysctl.h>
+#include <sys/types.h>
+#include <cstdlib>  //exit()
+#include <string.h> //strerror()
+
+#define GETSYSCTL(name, var) getsysctl(name, &(var), sizeof(var))
+static inline void getsysctl( const char *name, void *ptr, size_t len )
+{
+  size_t nlen = len;
+
+  if( sysctlbyname( name, ptr, &nlen, NULL, 0 ) == -1 )
+  {
+    std::cerr << "sysctl(" << name << "...) failed: " << strerror( errno )
+      << std::endl;
+    exit( EXIT_FAILURE );
+  }
+
+  if( nlen != len )
+  {
+    std::cerr << "sysctl(" << name << "...) expected " 
+      << static_cast<unsigned long>( len ) << " bytes, got "
+      << static_cast<unsigned long>( nlen ) << " bytes\n";
+    //exit( 23 );
+  }
+}
+
+#endif