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 */
42DEF_STATIC_JNI_OnLoad
43
44JNIEXPORT jint JNICALL
45Java_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)
59typedef struct flock FLOCK;
60#else
61typedef 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 */
69JNIEXPORT jintArray JNICALL
70Java_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 */
127JNIEXPORT jint JNICALL
128Java_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}
154