1 /* 2 * Copyright (c) 2001, 2015, 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 /* 39 * Declare library specific JNI_Onload entry if static build 40 */ 41 DEF_STATIC_JNI_OnLoad 42 43 JNIEXPORT jint JNICALL 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, NULL); 47 int result = -1; 48 if (fname) { 49 result = chmod(fname, permission); 50 if (result != 0) 51 result = errno; 52 JNU_ReleaseStringPlatformChars(env, java_fname, fname); 53 } 54 return (jint) result; 55 } 56 57 #if defined(_ALLBSD_SOURCE) 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 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, NULL); 72 int fd, rc; 73 int result[2]; 74 jintArray javaResult = NULL; 75 int old_umask; 76 FLOCK fl; 77 78 if (!fname) 79 return javaResult; 80 81 fl.l_whence = SEEK_SET; 82 fl.l_len = 0; 83 fl.l_start = 0; 84 if (shared == JNI_TRUE) { 85 fl.l_type = F_RDLCK; 86 } else { 87 fl.l_type = F_WRLCK; 88 } 89 90 if (shared == JNI_TRUE) { 91 fd = open(fname, O_RDONLY, 0); 92 } else { 93 old_umask = umask(0); 94 fd = open(fname, O_WRONLY|O_CREAT, permission); 95 result[1] = errno; 96 umask(old_umask); 97 } 98 99 if (fd < 0) { 100 result[0] = 0; 101 } else { 102 #if defined(_ALLBSD_SOURCE) 103 rc = fcntl(fd, F_SETLK, &fl); 104 #else 105 rc = fcntl(fd, F_SETLK64, &fl); 106 #endif 107 result[1] = errno; 108 if (rc < 0) { 109 result[0]= 0; 110 close(fd); 111 } else { 112 result[0] = fd; 113 } 114 } 115 JNU_ReleaseStringPlatformChars(env, java_fname, fname); 116 javaResult = (*env)->NewIntArray(env,2); 117 if (javaResult) 118 (*env)->SetIntArrayRegion(env, javaResult, 0, 2, result); 119 return javaResult; 120 } 121 122 123 /** 124 * Try to unlock a lock file, using a cookie returned by lockFile. 125 */ 126 JNIEXPORT jint JNICALL 127 Java_java_util_prefs_FileSystemPreferences_unlockFile0(JNIEnv *env, 128 jclass thisclass, jint fd) { 129 130 int rc; 131 FLOCK fl; 132 fl.l_whence = SEEK_SET; 133 fl.l_len = 0; 134 fl.l_start = 0; 135 fl.l_type = F_UNLCK; 136 137 #if defined(_ALLBSD_SOURCE) 138 rc = fcntl(fd, F_SETLK, &fl); 139 #else 140 rc = fcntl(fd, F_SETLK64, &fl); 141 #endif 142 143 if (rc < 0) { 144 close(fd); 145 return (jint)errno; 146 } 147 rc = close(fd); 148 if (rc < 0) { 149 return (jint) errno; 150 } 151 return 0; 152 }