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 
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
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