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.
139 lines
4 KiB
C
139 lines
4 KiB
C
/*
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* Copyright (c) 2001, 2024, 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. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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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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/*
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* Solaris/Linux platform specific code to support the Prefs API.
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*/
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <utime.h>
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#include "jni_util.h"
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#include "java_util_prefs_FileSystemPreferences.h"
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/*
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* Declare library specific JNI_Onload entry if static build
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*/
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DEF_STATIC_JNI_OnLoad
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JNIEXPORT jint JNICALL
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Java_java_util_prefs_FileSystemPreferences_chmod(JNIEnv *env,
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jclass thisclass, jstring java_fname, jint permission) {
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const char *fname = JNU_GetStringPlatformChars(env, java_fname, NULL);
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int result = -1;
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if (fname) {
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result = chmod(fname, permission);
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if (result != 0)
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result = errno;
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JNU_ReleaseStringPlatformChars(env, java_fname, fname);
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}
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return (jint) result;
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}
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/**
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* Try to open a named lock file.
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* The result is a cookie that can be used later to unlock the file.
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* On failure the result is zero.
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*/
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JNIEXPORT jintArray JNICALL
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Java_java_util_prefs_FileSystemPreferences_lockFile0(JNIEnv *env,
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jclass thisclass, jstring java_fname, jint permission, jboolean shared) {
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const char *fname = JNU_GetStringPlatformChars(env, java_fname, NULL);
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int fd, rc;
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int result[2] = {0, 0};
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jintArray javaResult = NULL;
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int old_umask;
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struct flock fl;
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if (!fname)
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return javaResult;
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fl.l_whence = SEEK_SET;
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fl.l_len = 0;
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fl.l_start = 0;
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if (shared == JNI_TRUE) {
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fl.l_type = F_RDLCK;
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} else {
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fl.l_type = F_WRLCK;
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}
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if (shared == JNI_TRUE) {
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fd = open(fname, O_RDONLY, 0);
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result[1] = errno;
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} else {
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old_umask = umask(0);
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fd = open(fname, O_WRONLY|O_CREAT, permission);
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result[1] = errno;
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umask(old_umask);
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}
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if (fd < 0) {
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result[0] = 0;
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} else {
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rc = fcntl(fd, F_SETLK, &fl);
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result[1] = errno;
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if (rc < 0) {
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result[0]= 0;
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close(fd);
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} else {
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result[0] = fd;
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}
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}
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JNU_ReleaseStringPlatformChars(env, java_fname, fname);
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javaResult = (*env)->NewIntArray(env,2);
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if (javaResult)
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(*env)->SetIntArrayRegion(env, javaResult, 0, 2, result);
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return javaResult;
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}
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/**
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* Try to unlock a lock file, using a cookie returned by lockFile.
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*/
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JNIEXPORT jint JNICALL
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Java_java_util_prefs_FileSystemPreferences_unlockFile0(JNIEnv *env,
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jclass thisclass, jint fd) {
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int rc;
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struct flock fl;
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fl.l_whence = SEEK_SET;
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fl.l_len = 0;
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fl.l_start = 0;
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fl.l_type = F_UNLCK;
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rc = fcntl(fd, F_SETLK, &fl);
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if (rc < 0) {
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close(fd);
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return (jint)errno;
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}
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rc = close(fd);
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if (rc < 0) {
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return (jint) errno;
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}
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return 0;
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}
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