1 /*
2 * Copyright (c) 2008, 2009, 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 "jlong.h"
29
30 #include <unistd.h>
31 #include <errno.h>
32
33 #include "sun_nio_fs_UnixCopyFile.h"
34
35 #define RESTARTABLE(_cmd, _result) do { \
36 do { \
37 _result = _cmd; \
38 } while((_result == -1) && (errno == EINTR)); \
39 } while(0)
40
throwUnixException(JNIEnv * env,int errnum)41 static void throwUnixException(JNIEnv* env, int errnum) {
42 jobject x = JNU_NewObjectByName(env, "sun/nio/fs/UnixException",
43 "(I)V", errnum);
44 if (x != NULL) {
45 (*env)->Throw(env, x);
46 }
47 }
48
49 /**
50 * Transfer all bytes from src to dst via user-space buffers
51 */
52 JNIEXPORT void JNICALL
Java_sun_nio_fs_UnixCopyFile_transfer(JNIEnv * env,jclass this,jint dst,jint src,jlong cancelAddress)53 Java_sun_nio_fs_UnixCopyFile_transfer
54 (JNIEnv* env, jclass this, jint dst, jint src, jlong cancelAddress)
55 {
56 char buf[8192];
57 volatile jint* cancel = (jint*)jlong_to_ptr(cancelAddress);
58
59 for (;;) {
60 ssize_t n, pos, len;
61 RESTARTABLE(read((int)src, &buf, sizeof(buf)), n);
62 if (n <= 0) {
63 if (n < 0)
64 throwUnixException(env, errno);
65 return;
66 }
67 if (cancel != NULL && *cancel != 0) {
68 throwUnixException(env, ECANCELED);
69 return;
70 }
71 pos = 0;
72 len = n;
73 do {
74 char* bufp = buf;
75 bufp += pos;
76 RESTARTABLE(write((int)dst, bufp, len), n);
77 if (n == -1) {
78 throwUnixException(env, errno);
79 return;
80 }
81 pos += n;
82 len -= n;
83 } while (len > 0);
84 }
85 }
86