1/*
2 * Copyright (c) 2008, 2011, 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#include "jni.h"
27#include "jni_util.h"
28#include "jvm.h"
29#include "jlong.h"
30
31#include <stdlib.h>
32#include <dlfcn.h>
33#include <sys/types.h>
34#include <sys/socket.h>
35#include <sys/poll.h>
36#include <sys/inotify.h>
37
38#include "sun_nio_fs_LinuxWatchService.h"
39
40static void throwUnixException(JNIEnv* env, int errnum) {
41    jobject x = JNU_NewObjectByName(env, "sun/nio/fs/UnixException",
42        "(I)V", errnum);
43    if (x != NULL) {
44        (*env)->Throw(env, x);
45    }
46}
47
48JNIEXPORT jint JNICALL
49Java_sun_nio_fs_LinuxWatchService_eventSize(JNIEnv *env, jclass clazz)
50{
51    return (jint)sizeof(struct inotify_event);
52}
53
54JNIEXPORT jintArray JNICALL
55Java_sun_nio_fs_LinuxWatchService_eventOffsets(JNIEnv *env, jclass clazz)
56{
57    jintArray result = (*env)->NewIntArray(env, 5);
58    if (result != NULL) {
59        jint arr[5];
60        arr[0] = (jint)offsetof(struct inotify_event, wd);
61        arr[1] = (jint)offsetof(struct inotify_event, mask);
62        arr[2] = (jint)offsetof(struct inotify_event, cookie);
63        arr[3] = (jint)offsetof(struct inotify_event, len);
64        arr[4] = (jint)offsetof(struct inotify_event, name);
65        (*env)->SetIntArrayRegion(env, result, 0, 5, arr);
66    }
67    return result;
68}
69
70
71JNIEXPORT jint JNICALL
72Java_sun_nio_fs_LinuxWatchService_inotifyInit
73    (JNIEnv* env, jclass clazz)
74{
75    int ifd = inotify_init();
76    if (ifd == -1) {
77        throwUnixException(env, errno);
78    }
79    return (jint)ifd;
80}
81
82JNIEXPORT jint JNICALL
83Java_sun_nio_fs_LinuxWatchService_inotifyAddWatch
84    (JNIEnv* env, jclass clazz, jint fd, jlong address, jint mask)
85{
86    int wfd = -1;
87    const char* path = (const char*)jlong_to_ptr(address);
88
89    wfd = inotify_add_watch((int)fd, path, mask);
90    if (wfd == -1) {
91        throwUnixException(env, errno);
92    }
93    return (jint)wfd;
94}
95
96JNIEXPORT void JNICALL
97Java_sun_nio_fs_LinuxWatchService_inotifyRmWatch
98    (JNIEnv* env, jclass clazz, jint fd, jint wd)
99{
100    int err = inotify_rm_watch((int)fd, (int)wd);
101    if (err == -1)
102        throwUnixException(env, errno);
103}
104
105JNIEXPORT void JNICALL
106Java_sun_nio_fs_LinuxWatchService_configureBlocking
107    (JNIEnv* env, jclass clazz, jint fd, jboolean blocking)
108{
109    int flags = fcntl(fd, F_GETFL);
110
111    if ((blocking == JNI_FALSE) && !(flags & O_NONBLOCK))
112        fcntl(fd, F_SETFL, flags | O_NONBLOCK);
113    else if ((blocking == JNI_TRUE) && (flags & O_NONBLOCK))
114        fcntl(fd, F_SETFL, flags & ~O_NONBLOCK);
115}
116
117JNIEXPORT void JNICALL
118Java_sun_nio_fs_LinuxWatchService_socketpair
119    (JNIEnv* env, jclass clazz, jintArray sv)
120{
121    int sp[2];
122    if (socketpair(PF_UNIX, SOCK_STREAM, 0, sp) == -1) {
123        throwUnixException(env, errno);
124    } else {
125        jint res[2];
126        res[0] = (jint)sp[0];
127        res[1] = (jint)sp[1];
128        (*env)->SetIntArrayRegion(env, sv, 0, 2, &res[0]);
129    }
130}
131
132JNIEXPORT jint JNICALL
133Java_sun_nio_fs_LinuxWatchService_poll
134    (JNIEnv* env, jclass clazz, jint fd1, jint fd2)
135{
136    struct pollfd ufds[2];
137    int n;
138
139    ufds[0].fd = fd1;
140    ufds[0].events = POLLIN;
141    ufds[1].fd = fd2;
142    ufds[1].events = POLLIN;
143
144    n = poll(&ufds[0], 2, -1);
145    if (n == -1) {
146        if (errno == EINTR) {
147            n = 0;
148        } else {
149            throwUnixException(env, errno);
150        }
151     }
152    return (jint)n;
153}
154