J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2001-2004 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any 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; |
| 43 | result = chmod(fname, permission); |
| 44 | if (result != 0) |
| 45 | result = errno; |
| 46 | JNU_ReleaseStringPlatformChars(env, java_fname, fname); |
| 47 | return (jint) result; |
| 48 | } |
| 49 | |
| 50 | |
| 51 | typedef struct flock64 FLOCK; |
| 52 | |
| 53 | /** |
| 54 | * Try to open a named lock file. |
| 55 | * The result is a cookie that can be used later to unlock the file. |
| 56 | * On failure the result is zero. |
| 57 | */ |
| 58 | JNIEXPORT jintArray JNICALL |
| 59 | Java_java_util_prefs_FileSystemPreferences_lockFile0(JNIEnv *env, |
| 60 | jclass thisclass, jstring java_fname, jint permission, jboolean shared) { |
| 61 | const char *fname = JNU_GetStringPlatformChars(env, java_fname, JNI_FALSE); |
| 62 | int fd, rc; |
| 63 | int result[2]; |
| 64 | jintArray javaResult; |
| 65 | int old_umask; |
| 66 | FLOCK fl; |
| 67 | |
| 68 | fl.l_whence = SEEK_SET; |
| 69 | fl.l_len = 0; |
| 70 | fl.l_start = 0; |
| 71 | if (shared == JNI_TRUE) { |
| 72 | fl.l_type = F_RDLCK; |
| 73 | } else { |
| 74 | fl.l_type = F_WRLCK; |
| 75 | } |
| 76 | |
| 77 | if (shared == JNI_TRUE) { |
| 78 | fd = open(fname, O_RDONLY, 0); |
| 79 | } else { |
| 80 | old_umask = umask(0); |
| 81 | fd = open(fname, O_WRONLY|O_CREAT, permission); |
| 82 | result[1] = errno; |
| 83 | umask(old_umask); |
| 84 | } |
| 85 | |
| 86 | if (fd < 0) { |
| 87 | result[0] = 0; |
| 88 | } else { |
| 89 | rc = fcntl(fd, F_SETLK64, &fl); |
| 90 | result[1] = errno; |
| 91 | if (rc < 0) { |
| 92 | result[0]= 0; |
| 93 | close(fd); |
| 94 | } else { |
| 95 | result[0] = fd; |
| 96 | } |
| 97 | } |
| 98 | JNU_ReleaseStringPlatformChars(env, java_fname, fname); |
| 99 | javaResult = (*env)->NewIntArray(env,2); |
| 100 | (*env)->SetIntArrayRegion(env, javaResult, 0, 2, result); |
| 101 | return javaResult; |
| 102 | } |
| 103 | |
| 104 | |
| 105 | /** |
| 106 | * Try to unlock a lock file, using a cookie returned by lockFile. |
| 107 | */ |
| 108 | JNIEXPORT jint JNICALL |
| 109 | Java_java_util_prefs_FileSystemPreferences_unlockFile0(JNIEnv *env, |
| 110 | jclass thisclass, jint fd) { |
| 111 | |
| 112 | int rc; |
| 113 | FLOCK fl; |
| 114 | fl.l_whence = SEEK_SET; |
| 115 | fl.l_len = 0; |
| 116 | fl.l_start = 0; |
| 117 | fl.l_type = F_UNLCK; |
| 118 | |
| 119 | rc = fcntl(fd, F_SETLK64, &fl); |
| 120 | |
| 121 | if (rc < 0) { |
| 122 | close(fd); |
| 123 | return (jint)errno; |
| 124 | } |
| 125 | rc = close(fd); |
| 126 | if (rc < 0) { |
| 127 | return (jint) errno; |
| 128 | } |
| 129 | return 0; |
| 130 | } |