socketinputstream_md.c

来自「This is a resource based on j2me embedde」· C语言 代码 · 共 169 行

/*
 * @(#)SocketInputStream_md.c	1.17 06/10/10
 *
 * Copyright  1990-2008 Sun Microsystems, Inc. All Rights Reserved.  
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER  
 *   
 * This program 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.   
 *   
 * This program 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 at /legal/license.txt).   
 *   
 * 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 Sun Microsystems, Inc., 4150 Network Circle, Santa  
 * Clara, CA 95054 or visit www.sun.com if you need additional  
 * information or have any questions. 
 *
 */

#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>

#include "jvm.h"
#include "jni_util.h"
#include "net_util.h"

#include "java_net_SocketInputStream.h"


/************************************************************************
 * SocketInputStream
 */

#include "jni_statics.h"

/*
 * Class:     java_net_SocketInputStream
 * Method:    init
 * Signature: ()V
 */
JNIEXPORT void JNICALL 
Java_java_net_SocketInputStream_init(JNIEnv *env, jclass cls) {
    JNI_STATIC_MD(java_net_SocketInputStream, IO_fd_fdID) =
        NET_GetFileDescriptorID(env);
}

/*
 * Class:     java_net_SocketInputStream
 * Method:    socketRead0
 * Signature: (Ljava/io/FileDescriptor;[BIII)I
 */
JNIEXPORT jint JNICALL
Java_java_net_SocketInputStream_socketRead0(JNIEnv *env, jobject this, 
                                            jobject fdObj, jbyteArray data, 
                                            jint off, jint len, jint timeout)
{
    char BUF[MAX_BUFFER_LEN];
    char *bufP;
    jint fd, nread;

    if (IS_NULL(fdObj)) {
	/* should't this be a NullPointerException? -br */
        JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException", 
			"Socket closed");
	return -1;
    } else {
        fd = (*env)->GetIntField(env, fdObj, JNI_STATIC_MD(java_net_SocketInputStream, IO_fd_fdID));
        /* Bug 4086704 - If the Socket associated with this file descriptor
         * was closed (sysCloseFD), the the file descriptor is set to -1.
         */
        if (fd == -1) {
            JNU_ThrowByName(env, "java/net/SocketException", "Socket closed");
            return -1;
        }
    }

    /* If requested amount to be read is > MAX_BUFFER_LEN then
     * we allocate a buffer from the heap (up to the limit
     * specified by MAX_HEAP_BUFFER_LEN). If memory is exhausted
     * we always use the stack buffer.
     */
    if (len <= MAX_BUFFER_LEN) {
        bufP = BUF;
    } else {
        if (len > MAX_HEAP_BUFFER_LEN) {
            len = MAX_HEAP_BUFFER_LEN;
        }
        bufP = (char *)malloc((size_t)len);
        if (bufP == NULL) {
            /* allocation failed so use stack buffer */
            bufP = BUF;
            len = MAX_BUFFER_LEN;
        }
    }

    if (timeout) {
	nread = NET_Timeout(fd, timeout);
        if (nread <= 0) {
            if (nread == 0) {
                JNU_ThrowByName(env, JNU_JAVANETPKG "SocketTimeoutException",
                                "Read timed out");
            } else if (nread == JVM_IO_ERR) {
                if (errno == EBADF) {
                    JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException",
                                    "Socket closed");
                } else {
                    NET_ThrowByNameWithLastError(env, JNU_JAVANETPKG 
                                                 "SocketException", 
                                                 "select/poll failed");
                }
    	    } else if (nread == JVM_IO_INTR) {
	        JNU_ThrowByName(env, JNU_JAVAIOPKG "InterruptedIOException",
			    "Operation interrupted");
    	    }
            if (bufP != BUF) {
                free(bufP);
            }
            return -1;
        }
    }
    /* %comment w004 */
    nread = NET_Read(fd, bufP, len);

    if (nread <= 0) {
	if (nread < 0) {

	    switch (errno) {
		case ECONNRESET:
		case EPIPE:
		    JNU_ThrowByName(env, "sun/net/ConnectionResetException", 	
			"Connection reset");
		    break;

		case EBADF:
		    JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException", 
			"Socket closed");
		    break;

		case EINTR:
                     JNU_ThrowByName(env, JNU_JAVAIOPKG "InterruptedIOException",
                           "Operation interrupted");
		     break;

		default:
	            NET_ThrowByNameWithLastError(env, 
			JNU_JAVANETPKG "SocketException", "Read failed");
	    }
	}
    } else {
        (*env)->SetByteArrayRegion(env, data, off, nread, (jbyte *)bufP);
    }

    if (bufP != BUF) {
	free(bufP);
    }
    return nread;
}