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
43 JNIEXPORT jint JNICALL
Java_java_util_prefs_FileSystemPreferences_chmod(JNIEnv * env,jclass thisclass,jstring java_fname,jint permission)44 Java_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 // Android-changed: Fuchsia: Alias *64 on Fuchsia builds. http://b/119496969
56 // #if defined(_ALLBSD_SOURCE)
57 #if defined(_ALLBSD_SOURCE) || defined(__Fuchsia__)
58 typedef struct flock FLOCK;
59 #else
60 typedef struct flock64 FLOCK;
61 #endif
62
63 /**
64 * Try to open a named lock file.
65 * The result is a cookie that can be used later to unlock the file.
66 * On failure the result is zero.
67 */
68 JNIEXPORT jintArray JNICALL
Java_java_util_prefs_FileSystemPreferences_lockFile0(JNIEnv * env,jclass thisclass,jstring java_fname,jint permission,jboolean shared)69 Java_java_util_prefs_FileSystemPreferences_lockFile0(JNIEnv *env,
70 jclass thisclass, jstring java_fname, jint permission, jboolean shared) {
71 const char *fname = JNU_GetStringPlatformChars(env, java_fname, JNI_FALSE);
72 int fd, rc;
73 int result[2];
74 jintArray javaResult;
75 int old_umask;
76 FLOCK fl;
77
78 fl.l_whence = SEEK_SET;
79 fl.l_len = 0;
80 fl.l_start = 0;
81 if (shared == JNI_TRUE) {
82 fl.l_type = F_RDLCK;
83 } else {
84 fl.l_type = F_WRLCK;
85 }
86
87 if (shared == JNI_TRUE) {
88 fd = open(fname, O_RDONLY, 0);
89 } else {
90 old_umask = umask(0);
91 fd = open(fname, O_WRONLY|O_CREAT, permission);
92 result[1] = errno;
93 umask(old_umask);
94 }
95
96 if (fd < 0) {
97 result[0] = 0;
98 } else {
99 // Android-changed: Fuchsia: Alias *64 on Fuchsia builds. http://b/119496969
100 // #if defined(_ALLBSD_SOURCE)
101 #if defined(_ALLBSD_SOURCE) || defined(__Fuchsia__)
102 rc = fcntl(fd, F_SETLK, &fl);
103 #else
104 rc = fcntl(fd, F_SETLK64, &fl);
105 #endif
106 result[1] = errno;
107 if (rc < 0) {
108 result[0]= 0;
109 close(fd);
110 } else {
111 result[0] = fd;
112 }
113 }
114 JNU_ReleaseStringPlatformChars(env, java_fname, fname);
115 javaResult = (*env)->NewIntArray(env,2);
116 (*env)->SetIntArrayRegion(env, javaResult, 0, 2, result);
117 return javaResult;
118 }
119
120
121 /**
122 * Try to unlock a lock file, using a cookie returned by lockFile.
123 */
124 JNIEXPORT jint JNICALL
Java_java_util_prefs_FileSystemPreferences_unlockFile0(JNIEnv * env,jclass thisclass,jint fd)125 Java_java_util_prefs_FileSystemPreferences_unlockFile0(JNIEnv *env,
126 jclass thisclass, jint fd) {
127
128 int rc;
129 FLOCK fl;
130 fl.l_whence = SEEK_SET;
131 fl.l_len = 0;
132 fl.l_start = 0;
133 fl.l_type = F_UNLCK;
134 // Android-changed: Fuchsia: Alias *64 on Fuchsia builds. http://b/119496969
135 // #if defined(_ALLBSD_SOURCE)
136 #if defined(_ALLBSD_SOURCE) || defined(__Fuchsia__)
137 rc = fcntl(fd, F_SETLK, &fl);
138 #else
139 rc = fcntl(fd, F_SETLK64, &fl);
140 #endif
141
142 if (rc < 0) {
143 close(fd);
144 return (jint)errno;
145 }
146 rc = close(fd);
147 if (rc < 0) {
148 return (jint) errno;
149 }
150 return 0;
151 }
152
153 static JNINativeMethod gMethods[] = {
154 NATIVE_METHOD(FileSystemPreferences, lockFile0, "(Ljava/lang/String;IZ)[I"),
155 NATIVE_METHOD(FileSystemPreferences, unlockFile0, "(I)I"),
156 NATIVE_METHOD(FileSystemPreferences, chmod, "(Ljava/lang/String;I)I"),
157 };
158
register_java_util_prefs_FileSystemPreferences(JNIEnv * env)159 void register_java_util_prefs_FileSystemPreferences(JNIEnv* env) {
160 jniRegisterNativeMethods(env, "java/util/prefs/FileSystemPreferences", gMethods, NELEM(gMethods));
161 }
162