1 /* 2 * Copyright (c) 2018, 2020, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package jdk.internal.platform.cgroupv1; 27 28 import jdk.internal.platform.CgroupSubsystem; 29 import jdk.internal.platform.CgroupSubsystemController; 30 31 public class CgroupV1SubsystemController implements CgroupSubsystemController { 32 33 private static final double DOUBLE_RETVAL_UNLIMITED = CgroupSubsystem.LONG_RETVAL_UNLIMITED; 34 // Values returned larger than this number are unlimited. 35 static long UNLIMITED_MIN = 0x7FFFFFFFFF000000L; 36 String root; 37 String mountPoint; 38 String path; 39 40 public CgroupV1SubsystemController(String root, String mountPoint) { 41 this.root = root; 42 this.mountPoint = mountPoint; 43 } 44 45 public void setPath(String cgroupPath) { 46 if (root != null && cgroupPath != null) { 47 if (root.equals("/")) { 48 if (!cgroupPath.equals("/")) { 49 path = mountPoint + cgroupPath; 50 } 51 else { 52 path = mountPoint; 53 } 54 } 55 else { 56 if (root.equals(cgroupPath)) { 57 path = mountPoint; 58 } 59 else { 60 if (cgroupPath.startsWith(root)) { 61 if (cgroupPath.length() > root.length()) { 62 String cgroupSubstr = cgroupPath.substring(root.length()); 63 path = mountPoint + cgroupSubstr; 64 } 65 } 66 } 67 } 68 } 69 } 70 71 @Override 72 public String path() { 73 return path; 74 } 75 76 public static long getLongEntry(CgroupSubsystemController controller, String param, String entryname) { 77 return CgroupSubsystemController.getLongEntry(controller, 78 param, 79 entryname, 80 CgroupSubsystem.LONG_RETVAL_UNLIMITED /* retval on error */); 81 } 82 83 public static double getDoubleValue(CgroupSubsystemController controller, String parm) { 84 return CgroupSubsystemController.getDoubleValue(controller, 85 parm, 86 DOUBLE_RETVAL_UNLIMITED /* retval on error */); 87 } 88 89 public static long convertStringToLong(String strval) { 90 return CgroupSubsystemController.convertStringToLong(strval, 91 Long.MAX_VALUE /* overflow value */, 92 CgroupSubsystem.LONG_RETVAL_UNLIMITED /* retval on error */); 93 } 94 95 public static long longValOrUnlimited(long value) { 96 return value > UNLIMITED_MIN ? CgroupSubsystem.LONG_RETVAL_UNLIMITED : value; 97 } 98 99 public static long getLongValueMatchingLine(CgroupSubsystemController controller, 100 String param, 101 String match) { 102 return CgroupSubsystemController.getLongValueMatchingLine(controller, 103 param, 104 match, 105 CgroupV1SubsystemController::convertHierachicalLimitLine, 106 CgroupSubsystem.LONG_RETVAL_UNLIMITED); 107 } 108 109 public static long convertHierachicalLimitLine(String line) { 110 String[] tokens = line.split("\\s"); 111 if (tokens.length == 2) { 112 String strVal = tokens[1]; 113 return CgroupV1SubsystemController.convertStringToLong(strVal); 114 } 115 return CgroupV1SubsystemController.UNLIMITED_MIN + 1; // unlimited 116 } 117 118 }