1 /* 2 * Copyright (c) 2001, 2014, 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 JNIEXPORT jint JNICALL 39 Java_java_util_prefs_FileSystemPreferences_chmod(JNIEnv *env, 40 jclass thisclass, jstring java_fname, jint permission) { 41 const char *fname = JNU_GetStringPlatformChars(env, java_fname, JNI_FALSE); 42 int result = -1; 43 if (fname) { 44 result = chmod(fname, permission); 45 if (result != 0) 46 result = errno; 47 JNU_ReleaseStringPlatformChars(env, java_fname, fname); 48 } 49 return (jint) result; 50 } 51 52 #if defined(_ALLBSD_SOURCE) 53 typedef struct flock FLOCK; 54 #else 55 typedef struct flock64 FLOCK; 56 #endif 57 58 /** 59 * Try to open a named lock file. 60 * The result is a cookie that can be used later to unlock the file. 61 * On failure the result is zero. 62 */ 63 JNIEXPORT jintArray JNICALL 64 Java_java_util_prefs_FileSystemPreferences_lockFile0(JNIEnv *env, 65 jclass thisclass, jstring java_fname, jint permission, jboolean shared) { 66 const char *fname = JNU_GetStringPlatformChars(env, java_fname, JNI_FALSE); 67 int fd, rc; 68 int result[2]; 69 jintArray javaResult = NULL; 70 int old_umask; 71 FLOCK fl; 72 73 if (!fname) 74 return javaResult; 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 if (javaResult) 113 (*env)->SetIntArrayRegion(env, javaResult, 0, 2, result); 114 return javaResult; 115 } 116 117 118 /** 119 * Try to unlock a lock file, using a cookie returned by lockFile. 120 */ 121 JNIEXPORT jint JNICALL 122 Java_java_util_prefs_FileSystemPreferences_unlockFile0(JNIEnv *env, 123 jclass thisclass, jint fd) { 124 125 int rc; 126 FLOCK fl; 127 fl.l_whence = SEEK_SET; 128 fl.l_len = 0; 129 fl.l_start = 0; 130 fl.l_type = F_UNLCK; 131 132 #if defined(_ALLBSD_SOURCE) 133 rc = fcntl(fd, F_SETLK, &fl); 134 #else 135 rc = fcntl(fd, F_SETLK64, &fl); 136 #endif 137 138 if (rc < 0) { 139 close(fd); 140 return (jint)errno; 141 } 142 rc = close(fd); 143 if (rc < 0) { 144 return (jint) errno; 145 } 146 return 0; 147 }