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