ojluni/src/main/native/FileDispatcherImpl.c - platform/libcore - Git at Google

 /*
  * Copyright (c) 2000, 2009, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this
  * particular file as subject to the "Classpath" exception as provided
  * by Oracle in the LICENSE file that accompanied this code.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  */

 #include "jni.h"
 #include "jni_util.h"
 #include "jvm.h"
 #include "jlong.h"
 #include "sun_nio_ch_FileDispatcherImpl.h"
 #include "java_lang_Long.h"
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <fcntl.h>
 #include <sys/uio.h>
 #include <unistd.h>
 #include "nio.h"
 #include "nio_util.h"
 #include "JNIHelp.h"

 #define NATIVE_METHOD(className, functionName, signature) \
 { #functionName, signature, (void*)(className ## _ ## functionName) }

 #ifdef _ALLBSD_SOURCE
 #define stat64 stat
 #define flock64 flock
 #define off64_t off_t
 #define F_SETLKW64 F_SETLKW
 #define F_SETLK64 F_SETLK

 #define pread64 pread
 #define pwrite64 pwrite
 #define ftruncate64 ftruncate
 #define fstat64 fstat

 #define fdatasync fsync
 #endif

 JNIEXPORT jint JNICALL
 FileDispatcherImpl_read0(JNIEnv *env, jclass clazz,
                              jobject fdo, jlong address, jint len)
 {
     jint fd = fdval(env, fdo);
     void *buf = (void *)jlong_to_ptr(address);

     return convertReturnVal(env, read(fd, buf, len), JNI_TRUE);
 }

 JNIEXPORT jint JNICALL
 FileDispatcherImpl_pread0(JNIEnv *env, jclass clazz, jobject fdo,
                             jlong address, jint len, jlong offset)
 {
     jint fd = fdval(env, fdo);
     void *buf = (void *)jlong_to_ptr(address);

     return convertReturnVal(env, pread64(fd, buf, len, offset), JNI_TRUE);
 }

 JNIEXPORT jlong JNICALL
 FileDispatcherImpl_readv0(JNIEnv *env, jclass clazz,
                               jobject fdo, jlong address, jint len)
 {
     jint fd = fdval(env, fdo);
     struct iovec *iov = (struct iovec *)jlong_to_ptr(address);
     return convertLongReturnVal(env, readv(fd, iov, len), JNI_TRUE);
 }

 JNIEXPORT jint JNICALL
 FileDispatcherImpl_write0(JNIEnv *env, jclass clazz,
                               jobject fdo, jlong address, jint len)
 {
     jint fd = fdval(env, fdo);
     void *buf = (void *)jlong_to_ptr(address);

     return convertReturnVal(env, write(fd, buf, len), JNI_FALSE);
 }

 JNIEXPORT jint JNICALL
 FileDispatcherImpl_pwrite0(JNIEnv *env, jclass clazz, jobject fdo,
                             jlong address, jint len, jlong offset)
 {
     jint fd = fdval(env, fdo);
     void *buf = (void *)jlong_to_ptr(address);

     return convertReturnVal(env, pwrite64(fd, buf, len, offset), JNI_FALSE);
 }

 JNIEXPORT jlong JNICALL
 FileDispatcherImpl_writev0(JNIEnv *env, jclass clazz,
                                        jobject fdo, jlong address, jint len)
 {
     jint fd = fdval(env, fdo);
     struct iovec *iov = (struct iovec *)jlong_to_ptr(address);
     return convertLongReturnVal(env, writev(fd, iov, len), JNI_FALSE);
 }

 static jlong
 handle(JNIEnv *env, jlong rv, char *msg)
 {
     if (rv >= 0)
         return rv;
     if (errno == EINTR)
         return IOS_INTERRUPTED;
     JNU_ThrowIOExceptionWithLastError(env, msg);
     return IOS_THROWN;
 }

 JNIEXPORT jint JNICALL
 FileDispatcherImpl_force0(JNIEnv *env, jobject this,
                                           jobject fdo, jboolean md)
 {
     jint fd = fdval(env, fdo);
     int result = 0;

     if (md == JNI_FALSE) {
         result = fdatasync(fd);
     } else {
         result = fsync(fd);
     }
     return handle(env, result, "Force failed");
 }

 JNIEXPORT jint JNICALL
 FileDispatcherImpl_truncate0(JNIEnv *env, jobject this,
                                              jobject fdo, jlong size)
 {
     return handle(env,
                   ftruncate64(fdval(env, fdo), size),
                   "Truncation failed");
 }

 JNIEXPORT jlong JNICALL
 FileDispatcherImpl_size0(JNIEnv *env, jobject this, jobject fdo)
 {
     struct stat64 fbuf;

     if (fstat64(fdval(env, fdo), &fbuf) < 0)
         return handle(env, -1, "Size failed");
     return fbuf.st_size;
 }

 JNIEXPORT jint JNICALL
 FileDispatcherImpl_lock0(JNIEnv *env, jobject this, jobject fdo,
                                       jboolean block, jlong pos, jlong size,
                                       jboolean shared)
 {
     jint fd = fdval(env, fdo);
     jint lockResult = 0;
     int cmd = 0;
     struct flock64 fl;

     fl.l_whence = SEEK_SET;
     if (size == (jlong)java_lang_Long_MAX_VALUE) {
         fl.l_len = (off64_t)0;
     } else {
         fl.l_len = (off64_t)size;
     }
     fl.l_start = (off64_t)pos;
     if (shared == JNI_TRUE) {
         fl.l_type = F_RDLCK;
     } else {
         fl.l_type = F_WRLCK;
     }
     if (block == JNI_TRUE) {
         cmd = F_SETLKW64;
     } else {
         cmd = F_SETLK64;
     }
     lockResult = fcntl(fd, cmd, &fl);
     if (lockResult < 0) {
         if ((cmd == F_SETLK64) && (errno == EAGAIN || errno == EACCES))
             return sun_nio_ch_FileDispatcherImpl_NO_LOCK;
         if (errno == EINTR)
             return sun_nio_ch_FileDispatcherImpl_INTERRUPTED;
         JNU_ThrowIOExceptionWithLastError(env, "Lock failed");
     }
     return 0;
 }

 JNIEXPORT void JNICALL
 FileDispatcherImpl_release0(JNIEnv *env, jobject this,
                                          jobject fdo, jlong pos, jlong size)
 {
     jint fd = fdval(env, fdo);
     jint lockResult = 0;
     struct flock64 fl;
     int cmd = F_SETLK64;

     fl.l_whence = SEEK_SET;
     if (size == (jlong)java_lang_Long_MAX_VALUE) {
         fl.l_len = (off64_t)0;
     } else {
         fl.l_len = (off64_t)size;
     }
     fl.l_start = (off64_t)pos;
     fl.l_type = F_UNLCK;
     lockResult = fcntl(fd, cmd, &fl);
     if (lockResult < 0) {
         JNU_ThrowIOExceptionWithLastError(env, "Release failed");
     }
 }


 static void closeFileDescriptor(JNIEnv *env, int fd) {
     if (fd != -1) {
         int result = close(fd);
         if (result < 0)
             JNU_ThrowIOExceptionWithLastError(env, "Close failed");
     }
 }

 JNIEXPORT void JNICALL
 FileDispatcherImpl_close0(JNIEnv *env, jclass clazz, jobject fdo)
 {
     jint fd = fdval(env, fdo);
     closeFileDescriptor(env, fd);
 }

 JNIEXPORT void JNICALL
 FileDispatcherImpl_preClose0(JNIEnv *env, jclass clazz, jobject fdo)
 {
     jint fd = fdval(env, fdo);
     int preCloseFD = open("/dev/null", O_RDWR | O_CLOEXEC);
     if (preCloseFD < 0) {
         JNU_ThrowIOExceptionWithLastError(env, "open(\"/dev/null\") failed");
         return;
     }
     if (dup2(preCloseFD, fd) < 0) {
         JNU_ThrowIOExceptionWithLastError(env, "dup2 failed");
     }
     close(preCloseFD);
 }

 JNIEXPORT void JNICALL
 FileDispatcherImpl_closeIntFD(JNIEnv *env, jclass clazz, jint fd)
 {
     closeFileDescriptor(env, fd);
 }

 static JNINativeMethod gMethods[] = {
   NATIVE_METHOD(FileDispatcherImpl, closeIntFD, "(I)V"),
   NATIVE_METHOD(FileDispatcherImpl, preClose0, "(Ljava/io/FileDescriptor;)V"),
   NATIVE_METHOD(FileDispatcherImpl, close0, "(Ljava/io/FileDescriptor;)V"),
   NATIVE_METHOD(FileDispatcherImpl, release0, "(Ljava/io/FileDescriptor;JJ)V"),
   NATIVE_METHOD(FileDispatcherImpl, lock0, "(Ljava/io/FileDescriptor;ZJJZ)I"),
   NATIVE_METHOD(FileDispatcherImpl, size0, "(Ljava/io/FileDescriptor;)J"),
   NATIVE_METHOD(FileDispatcherImpl, truncate0, "(Ljava/io/FileDescriptor;J)I"),
   NATIVE_METHOD(FileDispatcherImpl, force0, "(Ljava/io/FileDescriptor;Z)I"),
   NATIVE_METHOD(FileDispatcherImpl, writev0, "(Ljava/io/FileDescriptor;JI)J"),
   NATIVE_METHOD(FileDispatcherImpl, pwrite0, "(Ljava/io/FileDescriptor;JIJ)I"),
   NATIVE_METHOD(FileDispatcherImpl, write0, "(Ljava/io/FileDescriptor;JI)I"),
   NATIVE_METHOD(FileDispatcherImpl, readv0, "(Ljava/io/FileDescriptor;JI)J"),
   NATIVE_METHOD(FileDispatcherImpl, pread0, "(Ljava/io/FileDescriptor;JIJ)I"),
   NATIVE_METHOD(FileDispatcherImpl, read0, "(Ljava/io/FileDescriptor;JI)I"),
 };

 void register_sun_nio_ch_FileDispatcherImpl(JNIEnv* env) {
   jniRegisterNativeMethods(env, "sun/nio/ch/FileDispatcherImpl", gMethods, NELEM(gMethods));
 }
	/*
	* Copyright (c) 2000, 2009, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	#include "jni.h"
	#include "jni_util.h"
	#include "jvm.h"
	#include "jlong.h"
	#include "sun_nio_ch_FileDispatcherImpl.h"
	#include "java_lang_Long.h"
	#include <sys/types.h>
	#include <sys/socket.h>
	#include <fcntl.h>
	#include <sys/uio.h>
	#include <unistd.h>
	#include "nio.h"
	#include "nio_util.h"
	#include "JNIHelp.h"

	#define NATIVE_METHOD(className, functionName, signature) \
	{ #functionName, signature, (void*)(className ## _ ## functionName) }

	#ifdef _ALLBSD_SOURCE
	#define stat64 stat
	#define flock64 flock
	#define off64_t off_t
	#define F_SETLKW64 F_SETLKW
	#define F_SETLK64 F_SETLK

	#define pread64 pread
	#define pwrite64 pwrite
	#define ftruncate64 ftruncate
	#define fstat64 fstat

	#define fdatasync fsync
	#endif

	JNIEXPORT jint JNICALL
	FileDispatcherImpl_read0(JNIEnv *env, jclass clazz,
	jobject fdo, jlong address, jint len)
	{
	jint fd = fdval(env, fdo);
	void buf = (void )jlong_to_ptr(address);

	return convertReturnVal(env, read(fd, buf, len), JNI_TRUE);
	}

	JNIEXPORT jint JNICALL
	FileDispatcherImpl_pread0(JNIEnv *env, jclass clazz, jobject fdo,
	jlong address, jint len, jlong offset)
	{
	jint fd = fdval(env, fdo);
	void buf = (void )jlong_to_ptr(address);

	return convertReturnVal(env, pread64(fd, buf, len, offset), JNI_TRUE);
	}

	JNIEXPORT jlong JNICALL
	FileDispatcherImpl_readv0(JNIEnv *env, jclass clazz,
	jobject fdo, jlong address, jint len)
	{
	jint fd = fdval(env, fdo);
	struct iovec iov = (struct iovec )jlong_to_ptr(address);
	return convertLongReturnVal(env, readv(fd, iov, len), JNI_TRUE);
	}

	JNIEXPORT jint JNICALL
	FileDispatcherImpl_write0(JNIEnv *env, jclass clazz,
	jobject fdo, jlong address, jint len)
	{
	jint fd = fdval(env, fdo);
	void buf = (void )jlong_to_ptr(address);

	return convertReturnVal(env, write(fd, buf, len), JNI_FALSE);
	}

	JNIEXPORT jint JNICALL
	FileDispatcherImpl_pwrite0(JNIEnv *env, jclass clazz, jobject fdo,
	jlong address, jint len, jlong offset)
	{
	jint fd = fdval(env, fdo);
	void buf = (void )jlong_to_ptr(address);

	return convertReturnVal(env, pwrite64(fd, buf, len, offset), JNI_FALSE);
	}

	JNIEXPORT jlong JNICALL
	FileDispatcherImpl_writev0(JNIEnv *env, jclass clazz,
	jobject fdo, jlong address, jint len)
	{
	jint fd = fdval(env, fdo);
	struct iovec iov = (struct iovec )jlong_to_ptr(address);
	return convertLongReturnVal(env, writev(fd, iov, len), JNI_FALSE);
	}

	static jlong
	handle(JNIEnv env, jlong rv, char msg)
	{
	if (rv >= 0)
	return rv;
	if (errno == EINTR)
	return IOS_INTERRUPTED;
	JNU_ThrowIOExceptionWithLastError(env, msg);
	return IOS_THROWN;
	}

	JNIEXPORT jint JNICALL
	FileDispatcherImpl_force0(JNIEnv *env, jobject this,
	jobject fdo, jboolean md)
	{
	jint fd = fdval(env, fdo);
	int result = 0;

	if (md == JNI_FALSE) {
	result = fdatasync(fd);
	} else {
	result = fsync(fd);
	}
	return handle(env, result, "Force failed");
	}

	JNIEXPORT jint JNICALL
	FileDispatcherImpl_truncate0(JNIEnv *env, jobject this,
	jobject fdo, jlong size)
	{
	return handle(env,
	ftruncate64(fdval(env, fdo), size),
	"Truncation failed");
	}

	JNIEXPORT jlong JNICALL
	FileDispatcherImpl_size0(JNIEnv *env, jobject this, jobject fdo)
	{
	struct stat64 fbuf;

	if (fstat64(fdval(env, fdo), &fbuf) < 0)
	return handle(env, -1, "Size failed");
	return fbuf.st_size;
	}

	JNIEXPORT jint JNICALL
	FileDispatcherImpl_lock0(JNIEnv *env, jobject this, jobject fdo,
	jboolean block, jlong pos, jlong size,
	jboolean shared)
	{
	jint fd = fdval(env, fdo);
	jint lockResult = 0;
	int cmd = 0;
	struct flock64 fl;

	fl.l_whence = SEEK_SET;
	if (size == (jlong)java_lang_Long_MAX_VALUE) {
	fl.l_len = (off64_t)0;
	} else {
	fl.l_len = (off64_t)size;
	}
	fl.l_start = (off64_t)pos;
	if (shared == JNI_TRUE) {
	fl.l_type = F_RDLCK;
	} else {
	fl.l_type = F_WRLCK;
	}
	if (block == JNI_TRUE) {
	cmd = F_SETLKW64;
	} else {
	cmd = F_SETLK64;
	}
	lockResult = fcntl(fd, cmd, &fl);
	if (lockResult < 0) {
	if ((cmd == F_SETLK64) && (errno == EAGAIN \|\| errno == EACCES))
	return sun_nio_ch_FileDispatcherImpl_NO_LOCK;
	if (errno == EINTR)
	return sun_nio_ch_FileDispatcherImpl_INTERRUPTED;
	JNU_ThrowIOExceptionWithLastError(env, "Lock failed");
	}
	return 0;
	}

	JNIEXPORT void JNICALL
	FileDispatcherImpl_release0(JNIEnv *env, jobject this,
	jobject fdo, jlong pos, jlong size)
	{
	jint fd = fdval(env, fdo);
	jint lockResult = 0;
	struct flock64 fl;
	int cmd = F_SETLK64;

	fl.l_whence = SEEK_SET;
	if (size == (jlong)java_lang_Long_MAX_VALUE) {
	fl.l_len = (off64_t)0;
	} else {
	fl.l_len = (off64_t)size;
	}
	fl.l_start = (off64_t)pos;
	fl.l_type = F_UNLCK;
	lockResult = fcntl(fd, cmd, &fl);
	if (lockResult < 0) {
	JNU_ThrowIOExceptionWithLastError(env, "Release failed");
	}
	}


	static void closeFileDescriptor(JNIEnv *env, int fd) {
	if (fd != -1) {
	int result = close(fd);
	if (result < 0)
	JNU_ThrowIOExceptionWithLastError(env, "Close failed");
	}
	}

	JNIEXPORT void JNICALL
	FileDispatcherImpl_close0(JNIEnv *env, jclass clazz, jobject fdo)
	{
	jint fd = fdval(env, fdo);
	closeFileDescriptor(env, fd);
	}

	JNIEXPORT void JNICALL
	FileDispatcherImpl_preClose0(JNIEnv *env, jclass clazz, jobject fdo)
	{
	jint fd = fdval(env, fdo);
	int preCloseFD = open("/dev/null", O_RDWR \| O_CLOEXEC);
	if (preCloseFD < 0) {
	JNU_ThrowIOExceptionWithLastError(env, "open(\"/dev/null\") failed");
	return;
	}
	if (dup2(preCloseFD, fd) < 0) {
	JNU_ThrowIOExceptionWithLastError(env, "dup2 failed");
	}
	close(preCloseFD);
	}

	JNIEXPORT void JNICALL
	FileDispatcherImpl_closeIntFD(JNIEnv *env, jclass clazz, jint fd)
	{
	closeFileDescriptor(env, fd);
	}

	static JNINativeMethod gMethods[] = {
	NATIVE_METHOD(FileDispatcherImpl, closeIntFD, "(I)V"),
	NATIVE_METHOD(FileDispatcherImpl, preClose0, "(Ljava/io/FileDescriptor;)V"),
	NATIVE_METHOD(FileDispatcherImpl, close0, "(Ljava/io/FileDescriptor;)V"),
	NATIVE_METHOD(FileDispatcherImpl, release0, "(Ljava/io/FileDescriptor;JJ)V"),
	NATIVE_METHOD(FileDispatcherImpl, lock0, "(Ljava/io/FileDescriptor;ZJJZ)I"),
	NATIVE_METHOD(FileDispatcherImpl, size0, "(Ljava/io/FileDescriptor;)J"),
	NATIVE_METHOD(FileDispatcherImpl, truncate0, "(Ljava/io/FileDescriptor;J)I"),
	NATIVE_METHOD(FileDispatcherImpl, force0, "(Ljava/io/FileDescriptor;Z)I"),
	NATIVE_METHOD(FileDispatcherImpl, writev0, "(Ljava/io/FileDescriptor;JI)J"),
	NATIVE_METHOD(FileDispatcherImpl, pwrite0, "(Ljava/io/FileDescriptor;JIJ)I"),
	NATIVE_METHOD(FileDispatcherImpl, write0, "(Ljava/io/FileDescriptor;JI)I"),
	NATIVE_METHOD(FileDispatcherImpl, readv0, "(Ljava/io/FileDescriptor;JI)J"),
	NATIVE_METHOD(FileDispatcherImpl, pread0, "(Ljava/io/FileDescriptor;JIJ)I"),
	NATIVE_METHOD(FileDispatcherImpl, read0, "(Ljava/io/FileDescriptor;JI)I"),
	};

	void register_sun_nio_ch_FileDispatcherImpl(JNIEnv* env) {
	jniRegisterNativeMethods(env, "sun/nio/ch/FileDispatcherImpl", gMethods, NELEM(gMethods));
	}