diff options
Diffstat (limited to 'pki/base/osutil/src/com/netscape/osutil/ResourceLimit.java')
-rw-r--r-- | pki/base/osutil/src/com/netscape/osutil/ResourceLimit.java | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/pki/base/osutil/src/com/netscape/osutil/ResourceLimit.java b/pki/base/osutil/src/com/netscape/osutil/ResourceLimit.java new file mode 100644 index 000000000..d914759d6 --- /dev/null +++ b/pki/base/osutil/src/com/netscape/osutil/ResourceLimit.java @@ -0,0 +1,108 @@ +// --- BEGIN COPYRIGHT BLOCK --- +// This program is free software; you can redistribute it and/or modify +// it under the terms of the GNU General Public License as published by +// the Free Software Foundation; version 2 of the License. +// +// This program is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. +// +// You should have received a copy of the GNU General Public License along +// with this program; if not, write to the Free Software Foundation, Inc., +// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. +// +// (C) 2007 Red Hat, Inc. +// All rights reserved. +// --- END COPYRIGHT BLOCK --- +package com.netscape.osutil; + + +import java.io.*; + + +/** + * This class is to enabled reading/setting of various resource limits + * on unix + */ +public class ResourceLimit { + + /** + * Return the current process id of the Java VM + */ + + /** + * See /usr/include/sys/resource.h + */ + public static int RLIMIT_CPU = 0; + public static int RLIMIT_FSIZE = 1; + public static int RLIMIT_DATA = 2; + public static int RLIMIT_STACK = 3; + public static int RLIMIT_CORE = 4; + public static int RLIMIT_NOFILE = 5; + public static int RLIMIT_VMEM = 6; + + /** + * Return the hard limit of the specified resource + */ + public static native int getHardLimit(int resource); + + /** + * Return the soft limit of the specified resource + */ + public static native int getSoftLimit(int resource); + + /** + * Set limits on the resource + */ + public static native int setLimits(int resource, int soft, int hard); + + static { + if (File.separatorChar == '/') + System.loadLibrary("osutil"); + } + + /* little test program here... */ + + public static void main(String args[]) { + try { + testFDlimit("64"); + printFDLimit(); + System.gc(); + System.out.println("Changing softlimit to be equal to hardlimit()"); + + setLimits(RLIMIT_NOFILE, + getHardLimit(RLIMIT_NOFILE), + getHardLimit(RLIMIT_NOFILE) + ); + + testFDlimit("1024"); + printFDLimit(); + } catch (Exception e) { + e.printStackTrace(); + } + + } + + private static void printFDLimit() { + System.out.println("Max filedescs (hardlimit) " + getHardLimit(RLIMIT_NOFILE)); + System.out.println("Max filedescs (softlimit) " + getSoftLimit(RLIMIT_NOFILE)); + } + + /* this creates as many files as it can. The files will be closed when this + function exits, as they will be garbage collected. */ + + private static void testFDlimit(String a) { + int count = 0; + FileOutputStream f[] = new FileOutputStream[1024]; + + try { + for (count = 0; count < 1024; count++) { + f[count] = new FileOutputStream("test_" + a + "_" + count); + } + } catch (Exception e) { + } + } + +} + |