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      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