1/*
2 * Copyright (c) 2001, 2004, 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/*
27 * Solaris/Linux platform specific code to support the Prefs API.
28 */
29
30#include <unistd.h>
31#include <sys/types.h>
32#include <sys/stat.h>
33#include <fcntl.h>
34#include <errno.h>
35#include <utime.h>
36#include "jni_util.h"
37
38#include <nativehelper/JNIHelp.h>
39
40#define NATIVE_METHOD(className, functionName, signature) \
41{ #functionName, signature, (void*)(Java_java_util_prefs_ ## className ## _ ## functionName) }
42
43JNIEXPORT jint JNICALL
44Java_java_util_prefs_FileSystemPreferences_chmod(JNIEnv *env,
45                       jclass thisclass, jstring java_fname, jint permission) {
46    const char *fname = JNU_GetStringPlatformChars(env, java_fname, JNI_FALSE);
47    int result;
48    result =  chmod(fname, permission);
49    if (result != 0)
50       result = errno;
51    JNU_ReleaseStringPlatformChars(env, java_fname, fname);
52    return (jint) result;
53}
54
55#if defined(_ALLBSD_SOURCE)
56typedef struct flock FLOCK;
57#else
58typedef struct flock64 FLOCK;
59#endif
60
61/**
62 * Try to open a named lock file.
63 * The result is a cookie that can be used later to unlock the file.
64 * On failure the result is zero.
65 */
66JNIEXPORT jintArray JNICALL
67Java_java_util_prefs_FileSystemPreferences_lockFile0(JNIEnv *env,
68    jclass thisclass, jstring java_fname, jint permission, jboolean shared) {
69    const char *fname = JNU_GetStringPlatformChars(env, java_fname, JNI_FALSE);
70    int fd, rc;
71    int result[2];
72    jintArray javaResult;
73    int old_umask;
74    FLOCK fl;
75
76    fl.l_whence = SEEK_SET;
77    fl.l_len = 0;
78    fl.l_start = 0;
79    if (shared == JNI_TRUE) {
80        fl.l_type = F_RDLCK;
81    } else {
82        fl.l_type = F_WRLCK;
83    }
84
85    if (shared == JNI_TRUE) {
86        fd = open(fname, O_RDONLY, 0);
87    } else {
88        old_umask = umask(0);
89        fd = open(fname, O_WRONLY|O_CREAT, permission);
90        result[1] = errno;
91        umask(old_umask);
92    }
93
94    if (fd < 0) {
95        result[0] = 0;
96    } else {
97#if defined(_ALLBSD_SOURCE)
98        rc = fcntl(fd, F_SETLK, &fl);
99#else
100        rc = fcntl(fd, F_SETLK64, &fl);
101#endif
102        result[1] = errno;
103        if (rc < 0) {
104            result[0]= 0;
105            close(fd);
106        } else {
107          result[0] = fd;
108        }
109    }
110    JNU_ReleaseStringPlatformChars(env, java_fname, fname);
111    javaResult = (*env)->NewIntArray(env,2);
112    (*env)->SetIntArrayRegion(env, javaResult, 0, 2, result);
113    return javaResult;
114}
115
116
117/**
118 * Try to unlock a lock file, using a cookie returned by lockFile.
119 */
120JNIEXPORT jint JNICALL
121Java_java_util_prefs_FileSystemPreferences_unlockFile0(JNIEnv *env,
122                                      jclass thisclass, jint fd) {
123
124    int rc;
125    FLOCK fl;
126    fl.l_whence = SEEK_SET;
127    fl.l_len = 0;
128    fl.l_start = 0;
129    fl.l_type = F_UNLCK;
130
131#if defined(_ALLBSD_SOURCE)
132    rc = fcntl(fd, F_SETLK, &fl);
133#else
134    rc = fcntl(fd, F_SETLK64, &fl);
135#endif
136
137    if (rc < 0) {
138        close(fd);
139        return (jint)errno;
140    }
141    rc = close(fd);
142    if (rc < 0) {
143        return (jint) errno;
144    }
145    return 0;
146}
147
148static JNINativeMethod gMethods[] = {
149    NATIVE_METHOD(FileSystemPreferences, lockFile0, "(Ljava/lang/String;IZ)[I"),
150    NATIVE_METHOD(FileSystemPreferences, unlockFile0, "(I)I"),
151    NATIVE_METHOD(FileSystemPreferences, chmod, "(Ljava/lang/String;I)I"),
152};
153
154void register_java_util_prefs_FileSystemPreferences(JNIEnv* env) {
155    jniRegisterNativeMethods(env, "java/util/prefs/FileSystemPreferences", gMethods, NELEM(gMethods));
156}
157