russell@unturf.com
0a580b313d
Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com Patches, unit tests, benchmarks, whitepaper, and outreach briefs. Public domain — no copyright claimed. Use freely.
75 lines
2.2 KiB
C
75 lines
2.2 KiB
C
/*
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* Copyright (c) 2025, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/resource.h>
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#include "jvmti.h"
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static jint limit_num_fds();
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JNIEXPORT jint JNICALL
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Agent_OnLoad(JavaVM *jvm, char *options, void *reserved) {
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// Lower the number of possible open files to make the test go faster
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jint ret = limit_num_fds();
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if (ret != 0) {
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fprintf(stderr, "Failed to limit number of fds: %s", strerror(errno));
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return ret;
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}
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const char* filename = "./testfile_FDLeaker.txt";
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FILE* f = fopen(filename, "w");
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if (f == NULL) {
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fprintf(stderr, "Failed to open file: %s", strerror(errno));
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return JNI_ERR;
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}
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printf("Opened and leaked %s (%d)", filename, fileno(f));
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return JNI_OK;
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}
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static jint limit_num_fds() {
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struct rlimit rl;
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// Fetch the current limit
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int ret = getrlimit(RLIMIT_NOFILE, &rl);
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if (ret != 0) {
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return JNI_ERR;
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}
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// Use a lower value unless it is already low
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rlim_t limit = 100;
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if (limit < rl.rlim_cur) {
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rl.rlim_cur = limit;
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}
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// Lower the value
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int ret2 = setrlimit(RLIMIT_NOFILE, &rl);
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if (ret2 != 0) {
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return JNI_ERR;
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}
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return JNI_OK;
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}
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