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 "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 #if defined(_ALLBSD_SOURCE)
56 typedef struct flock FLOCK;
57 #else
58 typedef 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 */
66 JNIEXPORT jintArray JNICALL
Java_java_util_prefs_FileSystemPreferences_lockFile0(JNIEnv * env,jclass thisclass,jstring java_fname,jint permission,jboolean shared)67 Java_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 */
120 JNIEXPORT jint JNICALL
Java_java_util_prefs_FileSystemPreferences_unlockFile0(JNIEnv * env,jclass thisclass,jint fd)121 Java_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
148 static 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
register_java_util_prefs_FileSystemPreferences(JNIEnv * env)154 void register_java_util_prefs_FileSystemPreferences(JNIEnv* env) {
155 jniRegisterNativeMethods(env, "java/util/prefs/FileSystemPreferences", gMethods, NELEM(gMethods));
156 }
157