1/*
2 * Copyright (c) 2001, 2010, 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 "io_util.h"
30#include "io_util_md.h"
31#include <string.h>
32
33#ifdef MACOSX
34
35#include <CoreFoundation/CoreFoundation.h>
36
37__private_extern__
38jstring newStringPlatform(JNIEnv *env, const char* str)
39{
40    jstring rv = NULL;
41    CFMutableStringRef csref = CFStringCreateMutable(NULL, 0);
42    if (csref == NULL) {
43        JNU_ThrowOutOfMemoryError(env, "native heap");
44    } else {
45        CFStringAppendCString(csref, str, kCFStringEncodingUTF8);
46        CFStringNormalize(csref, kCFStringNormalizationFormC);
47        int clen = CFStringGetLength(csref);
48        int ulen = (clen + 1) * 2;        // utf16 + zero padding
49        char* chars = malloc(ulen);
50        if (chars == NULL) {
51            CFRelease(csref);
52            JNU_ThrowOutOfMemoryError(env, "native heap");
53        } else {
54            if (CFStringGetCString(csref, chars, ulen, kCFStringEncodingUTF16)) {
55                rv = (*env)->NewString(env, (jchar*)chars, clen);
56            }
57            free(chars);
58            CFRelease(csref);
59        }
60    }
61    return rv;
62}
63#endif
64
65FD
66handleOpen(const char *path, int oflag, int mode) {
67    FD fd;
68    RESTARTABLE(open64(path, oflag, mode), fd);
69    if (fd != -1) {
70        struct stat64 buf64;
71        int result;
72        RESTARTABLE(fstat64(fd, &buf64), result);
73        if (result != -1) {
74            if (S_ISDIR(buf64.st_mode)) {
75                close(fd);
76                errno = EISDIR;
77                fd = -1;
78            }
79        } else {
80            close(fd);
81            fd = -1;
82        }
83    }
84    return fd;
85}
86
87
88void
89fileOpen(JNIEnv *env, jobject this, jstring path, jfieldID fid, int flags)
90{
91    WITH_PLATFORM_STRING(env, path, ps) {
92        FD fd;
93
94#if defined(__linux__) || defined(_ALLBSD_SOURCE)
95        /* Remove trailing slashes, since the kernel won't */
96        char *p = (char *)ps + strlen(ps) - 1;
97        while ((p > ps) && (*p == '/'))
98            *p-- = '\0';
99#endif
100        fd = handleOpen(ps, flags, 0666);
101        if (fd != -1) {
102            SET_FD(this, fd, fid);
103        } else {
104            throwFileNotFoundException(env, path);
105        }
106    } END_PLATFORM_STRING(env, ps);
107}
108
109
110void
111fileClose(JNIEnv *env, jobject this, jfieldID fid)
112{
113    FD fd = GET_FD(this, fid);
114    if (fd == -1) {
115        return;
116    }
117
118    /* Set the fd to -1 before closing it so that the timing window
119     * of other threads using the wrong fd (closed but recycled fd,
120     * that gets re-opened with some other filename) is reduced.
121     * Practically the chance of its occurance is low, however, we are
122     * taking extra precaution over here.
123     */
124    SET_FD(this, -1, fid);
125
126    /*
127     * Don't close file descriptors 0, 1, or 2. If we close these stream
128     * then a subsequent file open or socket will use them. Instead we
129     * just redirect these file descriptors to /dev/null.
130     */
131    if (fd >= STDIN_FILENO && fd <= STDERR_FILENO) {
132        int devnull = open("/dev/null", O_WRONLY);
133        if (devnull < 0) {
134            SET_FD(this, fd, fid); // restore fd
135            JNU_ThrowIOExceptionWithLastError(env, "open /dev/null failed");
136        } else {
137            dup2(devnull, fd);
138            close(devnull);
139        }
140    } else if (JVM_Close(fd) == -1) {
141        JNU_ThrowIOExceptionWithLastError(env, "close failed");
142    }
143}
144