1 /* 2 * Copyright (c) 2001, 2018, 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 #include "java_util_prefs_FileSystemPreferences.h" 38 39 /* 40 * Declare library specific JNI_Onload entry if static build 41 */ 42 DEF_STATIC_JNI_OnLoad 43 44 JNIEXPORT jint JNICALL 45 Java_java_util_prefs_FileSystemPreferences_chmod(JNIEnv *env, 46 jclass thisclass, jstring java_fname, jint permission) { 47 const char *fname = JNU_GetStringPlatformChars(env, java_fname, NULL); 48 int result = -1; 49 if (fname) { 50 result = chmod(fname, permission); 51 if (result != 0) 52 result = errno; 53 JNU_ReleaseStringPlatformChars(env, java_fname, fname); 54 } 55 return (jint) result; 56 } 57 58 #if defined(_ALLBSD_SOURCE) 59 typedef struct flock FLOCK; 60 #else 61 typedef struct flock64 FLOCK; 62 #endif 63 64 /** 65 * Try to open a named lock file. 66 * The result is a cookie that can be used later to unlock the file. 67 * On failure the result is zero. 68 */ 69 JNIEXPORT jintArray JNICALL 70 Java_java_util_prefs_FileSystemPreferences_lockFile0(JNIEnv *env, 71 jclass thisclass, jstring java_fname, jint permission, jboolean shared) { 72 const char *fname = JNU_GetStringPlatformChars(env, java_fname, NULL); 73 int fd, rc; 74 int result[2]; 75 jintArray javaResult = NULL; 76 int old_umask; 77 FLOCK fl; 78 79 if (!fname) 80 return javaResult; 81 82 fl.l_whence = SEEK_SET; 83 fl.l_len = 0; 84 fl.l_start = 0; 85 if (shared == JNI_TRUE) { 86 fl.l_type = F_RDLCK; 87 } else { 88 fl.l_type = F_WRLCK; 89 } 90 91 if (shared == JNI_TRUE) { 92 fd = open(fname, O_RDONLY, 0); 93 } else { 94 old_umask = umask(0); 95 fd = open(fname, O_WRONLY|O_CREAT, permission); 96 result[1] = errno; 97 umask(old_umask); 98 } 99 100 if (fd < 0) { 101 result[0] = 0; 102 } else { 103 #if defined(_ALLBSD_SOURCE) 104 rc = fcntl(fd, F_SETLK, &fl); 105 #else 106 rc = fcntl(fd, F_SETLK64, &fl); 107 #endif 108 result[1] = errno; 109 if (rc < 0) { 110 result[0]= 0; 111 close(fd); 112 } else { 113 result[0] = fd; 114 } 115 } 116 JNU_ReleaseStringPlatformChars(env, java_fname, fname); 117 javaResult = (*env)->NewIntArray(env,2); 118 if (javaResult) 119 (*env)->SetIntArrayRegion(env, javaResult, 0, 2, result); 120 return javaResult; 121 } 122 123 124 /** 125 * Try to unlock a lock file, using a cookie returned by lockFile. 126 */ 127 JNIEXPORT jint JNICALL 128 Java_java_util_prefs_FileSystemPreferences_unlockFile0(JNIEnv *env, 129 jclass thisclass, jint fd) { 130 131 int rc; 132 FLOCK fl; 133 fl.l_whence = SEEK_SET; 134 fl.l_len = 0; 135 fl.l_start = 0; 136 fl.l_type = F_UNLCK; 137 138 #if defined(_ALLBSD_SOURCE) 139 rc = fcntl(fd, F_SETLK, &fl); 140 #else 141 rc = fcntl(fd, F_SETLK64, &fl); 142 #endif 143 144 if (rc < 0) { 145 close(fd); 146 return (jint)errno; 147 } 148 rc = close(fd); 149 if (rc < 0) { 150 return (jint) errno; 151 } 152 return 0; 153 }