llvm-gcc-4.2/libjava/classpath/native/jni/java-nio/gnu_java_nio_VMSelector.c - llvm-archive - Git at Google

 /* gnu_java_nio_VMSelector.c - Native methods for SelectorImpl class
    Copyright (C) 2004, 2005 Free Software Foundation, Inc.

 This file is part of GNU Classpath.

 GNU Classpath is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation; either version 2, or (at your option)
 any later version.

 GNU Classpath 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 for more details.

 You should have received a copy of the GNU General Public License
 along with GNU Classpath; see the file COPYING.  If not, write to the
 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 02110-1301 USA.

 Linking this library statically or dynamically with other modules is
 making a combined work based on this library.  Thus, the terms and
 conditions of the GNU General Public License cover the whole
 combination.

 As a special exception, the copyright holders of this library give you
 permission to link this library with independent modules to produce an
 executable, regardless of the license terms of these independent
 modules, and to copy and distribute the resulting executable under
 terms of your choice, provided that you also meet, for each linked
 independent module, the terms and conditions of the license of that
 module.  An independent module is a module which is not derived from
 or based on this library.  If you modify this library, you may extend
 this exception to your version of the library, but you are not
 obligated to do so.  If you do not wish to do so, delete this
 exception statement from your version. */

 #include "config.h"

 /* <sys/types.h> needs to be included on OSX before <sys/select.h> */
 #if defined(HAVE_SYS_TYPES_H)
 #include <sys/types.h>
 #endif

 #include <sys/select.h>
 #include <sys/time.h>

 #include <string.h>

 #include <errno.h>

 #include <jni.h>
 #include <jcl.h>

 #include "gnu_java_nio_VMSelector.h"

 /* Amount of characters in the error message buffer for strerror_r. */
 #define BUF_SIZE 250

 void helper_put_filedescriptors (JNIEnv *, jintArray, fd_set *, int *);

 void helper_get_filedescriptors (JNIEnv *, jintArray *, fd_set *);

 void helper_reset (JNIEnv *, jintArray *);

 int
 helper_select (JNIEnv *, jclass, jmethodID,
 	       int, fd_set *, fd_set *, fd_set *, struct timeval *);

 void
 helper_put_filedescriptors (JNIEnv * env, jintArray fdArray, fd_set * fds,
 			    int *max_fd)
 {
   jint *tmpFDArray = (*env)->GetIntArrayElements (env, fdArray, 0);
   int size = (*env)->GetArrayLength (env, fdArray);
   int index, fd;

   for (index = 0; index < size; index++)
     {
       fd = tmpFDArray[index];

       if (fd > 0)
 	{
 	  FD_SET (tmpFDArray[index], fds);

 	  if (tmpFDArray[index] > (*max_fd))
 	    (*max_fd) = tmpFDArray[index];
 	}
     }
 }

 void
 helper_get_filedescriptors (JNIEnv * env, jintArray * fdArray, fd_set * fds)
 {
   jint *tmpFDArray = (*env)->GetIntArrayElements (env, fdArray, 0);
   int size = (*env)->GetArrayLength (env, fdArray);
   int index, fd;

   for (index = 0; index < size; index++)
     {
       fd = tmpFDArray[index];
       if (fd < 0 || !FD_ISSET (fd, fds))
 	tmpFDArray[index] = 0;
     }
 }

 void
 helper_reset (JNIEnv * env, jintArray * fdArray)
 {
   jint *tmpFDArray = (*env)->GetIntArrayElements (env, fdArray, 0);
   int size = (*env)->GetArrayLength (env, fdArray);
   int index;

   for (index = 0; index < size; index++)
     tmpFDArray[index] = 0;
 }

 /* A wrapper for select() which ignores EINTR.
  * Taken from gclib's posix.cc
  */
 int
 helper_select (JNIEnv * env, jclass thread_class,
 	       jmethodID thread_interrupted, int n, fd_set * readfds,
 	       fd_set * writefds, fd_set * exceptfds, struct timeval *timeout)
 {
 #ifdef HAVE_SYS_SELECT_H
   /* If we have a timeout, compute the absolute ending time. */
   struct timeval end, delay, after;
   int r;

   if (timeout)
     {
       gettimeofday (&end, NULL);

       end.tv_usec += timeout->tv_usec;

       if (end.tv_usec >= 1000000)
 	{
 	  ++end.tv_sec;
 	  end.tv_usec -= 1000000;
 	}

       end.tv_sec += timeout->tv_sec;
       delay = *timeout;
     }
   else
     {
       /* Placate compiler. */
       delay.tv_sec = delay.tv_usec = 0;
     }

   while (1)
     {
       r = select (n, readfds, writefds, exceptfds, timeout ? &delay : NULL);

       if (r < 0 && errno != EINTR)
 	return -errno;
       else if (r >= 0)
 	return r;

       /* Here we know we got EINTR. */
       if ((*env)->
 	  CallStaticBooleanMethod (env, thread_class, thread_interrupted))
 	{
 	  return -EINTR;
 	}

       if (timeout)
 	{
 	  gettimeofday (&after, NULL);

 	  /* Now compute new timeout argument. */
 	  delay.tv_usec = end.tv_usec - after.tv_usec;
 	  delay.tv_sec = end.tv_sec - after.tv_sec;

 	  if (delay.tv_usec < 0)
 	    {
 	      --delay.tv_sec;
 	      delay.tv_usec += 1000000;
 	    }

 	  if (delay.tv_sec < 0)
 	    {
 	      /* We assume that the user wants a valid select() call
 	       * more than precise timing.  So if we get a series of
 	       * EINTR we just keep trying with delay 0 until we get a
 	       * valid result.
 	       */
 	      delay.tv_sec = 0;
 	    }
 	}
     }
 #else /* HAVE_SYS_SELECT_H */
   return 0;
 #endif

 }

 JNIEXPORT jint JNICALL
 Java_gnu_java_nio_VMSelector_select (JNIEnv * env,
 				     jclass obj __attribute__ ((__unused__)),
 				     jintArray read,
 				     jintArray write,
 				     jintArray except, jlong timeout)
 {
   jint result;
   jclass thread_class = (*env)->FindClass (env, "java/lang/Thread");
   jmethodID thread_current_thread =
     (*env)->GetStaticMethodID (env, thread_class, "currentThread",
 			       "()Ljava/lang/Thread;");
   jmethodID thread_interrupt =
     (*env)->GetMethodID (env, thread_class, "interrupt", "()V");
   jmethodID thread_interrupted =
     (*env)->GetStaticMethodID (env, thread_class, "interrupted", "()Z");
   jobject current_thread;
   int max_fd = 0;
   fd_set read_fds;
   fd_set write_fds;
   fd_set except_fds;
   struct timeval real_time_data;
   struct timeval *time_data = NULL;
   char message_buf[BUF_SIZE + 1];

   /* If a legal timeout value isn't given, use NULL.
    * This means an infinite timeout. The specification
    * also says that a zero timeout should be treated
    * as infinite. Otherwise (if the timeout value is legal),
    * fill our timeval struct and use it for the select.
    */
   if (timeout > 0)
     {
       real_time_data.tv_sec = timeout / 1000;
       real_time_data.tv_usec = (timeout % 1000) * 1000;
       time_data = &real_time_data;
     }

   /* Reset all fd_set structures */
   FD_ZERO (&read_fds);
   FD_ZERO (&write_fds);
   FD_ZERO (&except_fds);

   /* Fill the fd_set data structures for the _Jv_select() call. */
   helper_put_filedescriptors (env, read, &read_fds, &max_fd);
   helper_put_filedescriptors (env, write, &write_fds, &max_fd);
   helper_put_filedescriptors (env, except, &except_fds, &max_fd);

   /* Actually do the select */
   result =
     helper_select (env, thread_class, thread_interrupted, max_fd + 1,
 		   &read_fds, &write_fds, &except_fds, time_data);

   if (result == -EINTR)
     {
       /* The behavior of JRE 1.4.1 is that no exception is thrown
        * when the thread is interrupted, but the thread's interrupt
        * status is set. Clear all of our select sets and return 0,
        * indicating that nothing was selected.
        */
       current_thread =
 	(*env)->CallStaticObjectMethod (env, thread_class,
 					thread_current_thread);
       (*env)->CallVoidMethod (env, current_thread, thread_interrupt);

       helper_reset (env, read);
       helper_reset (env, write);
       helper_reset (env, except);

       return 0;
     }

   if (result < 0)
     {

       int errorcode = -result;

       if (strerror_r (errorcode, message_buf, BUF_SIZE))
 	{
 	  /* This would mean that message_buf was to small
 	   * to hold the error message.
 	   */
 	  JCL_ThrowException (env, "java/lang/InternalError",
 			      "Not enough space in message buffer.");
 	  return 0;
 	}

       JCL_ThrowException (env, "java/io/IOException", message_buf);
       return 0;
     }

   /* Set the file descriptors according to the values returned from select(). */
   helper_get_filedescriptors (env, read, &read_fds);
   helper_get_filedescriptors (env, write, &write_fds);
   helper_get_filedescriptors (env, except, &except_fds);

   return result;
 }
	/* gnu_java_nio_VMSelector.c - Native methods for SelectorImpl class
	Copyright (C) 2004, 2005 Free Software Foundation, Inc.

	This file is part of GNU Classpath.

	GNU Classpath is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2, or (at your option)
	any later version.

	GNU Classpath 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 for more details.

	You should have received a copy of the GNU General Public License
	along with GNU Classpath; see the file COPYING. If not, write to the
	Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
	02110-1301 USA.

	Linking this library statically or dynamically with other modules is
	making a combined work based on this library. Thus, the terms and
	conditions of the GNU General Public License cover the whole
	combination.

	As a special exception, the copyright holders of this library give you
	permission to link this library with independent modules to produce an
	executable, regardless of the license terms of these independent
	modules, and to copy and distribute the resulting executable under
	terms of your choice, provided that you also meet, for each linked
	independent module, the terms and conditions of the license of that
	module. An independent module is a module which is not derived from
	or based on this library. If you modify this library, you may extend
	this exception to your version of the library, but you are not
	obligated to do so. If you do not wish to do so, delete this
	exception statement from your version. */

	#include "config.h"

	/* <sys/types.h> needs to be included on OSX before <sys/select.h> */
	#if defined(HAVE_SYS_TYPES_H)
	#include <sys/types.h>
	#endif

	#include <sys/select.h>
	#include <sys/time.h>

	#include <string.h>

	#include <errno.h>

	#include <jni.h>
	#include <jcl.h>

	#include "gnu_java_nio_VMSelector.h"

	/* Amount of characters in the error message buffer for strerror_r. */
	#define BUF_SIZE 250

	void helper_put_filedescriptors (JNIEnv , jintArray, fd_set , int *);

	void helper_get_filedescriptors (JNIEnv , jintArray , fd_set *);

	void helper_reset (JNIEnv , jintArray );

	int
	helper_select (JNIEnv *, jclass, jmethodID,
	int, fd_set , fd_set , fd_set , struct timeval );

	void
	helper_put_filedescriptors (JNIEnv * env, jintArray fdArray, fd_set * fds,
	int *max_fd)
	{
	jint tmpFDArray = (env)->GetIntArrayElements (env, fdArray, 0);
	int size = (*env)->GetArrayLength (env, fdArray);
	int index, fd;

	for (index = 0; index < size; index++)
	{
	fd = tmpFDArray[index];

	if (fd > 0)
	{
	FD_SET (tmpFDArray[index], fds);

	if (tmpFDArray[index] > (*max_fd))
	(*max_fd) = tmpFDArray[index];
	}
	}
	}

	void
	helper_get_filedescriptors (JNIEnv * env, jintArray * fdArray, fd_set * fds)
	{
	jint tmpFDArray = (env)->GetIntArrayElements (env, fdArray, 0);
	int size = (*env)->GetArrayLength (env, fdArray);
	int index, fd;

	for (index = 0; index < size; index++)
	{
	fd = tmpFDArray[index];
	if (fd < 0 \|\| !FD_ISSET (fd, fds))
	tmpFDArray[index] = 0;
	}
	}

	void
	helper_reset (JNIEnv * env, jintArray * fdArray)
	{
	jint tmpFDArray = (env)->GetIntArrayElements (env, fdArray, 0);
	int size = (*env)->GetArrayLength (env, fdArray);
	int index;

	for (index = 0; index < size; index++)
	tmpFDArray[index] = 0;
	}

	/* A wrapper for select() which ignores EINTR.
	* Taken from gclib's posix.cc
	*/
	int
	helper_select (JNIEnv * env, jclass thread_class,
	jmethodID thread_interrupted, int n, fd_set * readfds,
	fd_set * writefds, fd_set * exceptfds, struct timeval *timeout)
	{
	#ifdef HAVE_SYS_SELECT_H
	/* If we have a timeout, compute the absolute ending time. */
	struct timeval end, delay, after;
	int r;

	if (timeout)
	{
	gettimeofday (&end, NULL);

	end.tv_usec += timeout->tv_usec;

	if (end.tv_usec >= 1000000)
	{
	++end.tv_sec;
	end.tv_usec -= 1000000;
	}

	end.tv_sec += timeout->tv_sec;
	delay = *timeout;
	}
	else
	{
	/* Placate compiler. */
	delay.tv_sec = delay.tv_usec = 0;
	}

	while (1)
	{
	r = select (n, readfds, writefds, exceptfds, timeout ? &delay : NULL);

	if (r < 0 && errno != EINTR)
	return -errno;
	else if (r >= 0)
	return r;

	/* Here we know we got EINTR. */
	if ((*env)->
	CallStaticBooleanMethod (env, thread_class, thread_interrupted))
	{
	return -EINTR;
	}

	if (timeout)
	{
	gettimeofday (&after, NULL);

	/* Now compute new timeout argument. */
	delay.tv_usec = end.tv_usec - after.tv_usec;
	delay.tv_sec = end.tv_sec - after.tv_sec;

	if (delay.tv_usec < 0)
	{
	--delay.tv_sec;
	delay.tv_usec += 1000000;
	}

	if (delay.tv_sec < 0)
	{
	/* We assume that the user wants a valid select() call
	* more than precise timing. So if we get a series of
	* EINTR we just keep trying with delay 0 until we get a
	* valid result.
	*/
	delay.tv_sec = 0;
	}
	}
	}
	#else /* HAVE_SYS_SELECT_H */
	return 0;
	#endif

	}

	JNIEXPORT jint JNICALL
	Java_gnu_java_nio_VMSelector_select (JNIEnv * env,
	jclass obj __attribute__ ((__unused__)),
	jintArray read,
	jintArray write,
	jintArray except, jlong timeout)
	{
	jint result;
	jclass thread_class = (*env)->FindClass (env, "java/lang/Thread");
	jmethodID thread_current_thread =
	(*env)->GetStaticMethodID (env, thread_class, "currentThread",
	"()Ljava/lang/Thread;");
	jmethodID thread_interrupt =
	(*env)->GetMethodID (env, thread_class, "interrupt", "()V");
	jmethodID thread_interrupted =
	(*env)->GetStaticMethodID (env, thread_class, "interrupted", "()Z");
	jobject current_thread;
	int max_fd = 0;
	fd_set read_fds;
	fd_set write_fds;
	fd_set except_fds;
	struct timeval real_time_data;
	struct timeval *time_data = NULL;
	char message_buf[BUF_SIZE + 1];

	/* If a legal timeout value isn't given, use NULL.
	* This means an infinite timeout. The specification
	* also says that a zero timeout should be treated
	* as infinite. Otherwise (if the timeout value is legal),
	* fill our timeval struct and use it for the select.
	*/
	if (timeout > 0)
	{
	real_time_data.tv_sec = timeout / 1000;
	real_time_data.tv_usec = (timeout % 1000) * 1000;
	time_data = &real_time_data;
	}

	/* Reset all fd_set structures */
	FD_ZERO (&read_fds);
	FD_ZERO (&write_fds);
	FD_ZERO (&except_fds);

	/* Fill the fd_set data structures for the _Jv_select() call. */
	helper_put_filedescriptors (env, read, &read_fds, &max_fd);
	helper_put_filedescriptors (env, write, &write_fds, &max_fd);
	helper_put_filedescriptors (env, except, &except_fds, &max_fd);

	/* Actually do the select */
	result =
	helper_select (env, thread_class, thread_interrupted, max_fd + 1,
	&read_fds, &write_fds, &except_fds, time_data);

	if (result == -EINTR)
	{
	/* The behavior of JRE 1.4.1 is that no exception is thrown
	* when the thread is interrupted, but the thread's interrupt
	* status is set. Clear all of our select sets and return 0,
	* indicating that nothing was selected.
	*/
	current_thread =
	(*env)->CallStaticObjectMethod (env, thread_class,
	thread_current_thread);
	(*env)->CallVoidMethod (env, current_thread, thread_interrupt);

	helper_reset (env, read);
	helper_reset (env, write);
	helper_reset (env, except);

	return 0;
	}

	if (result < 0)
	{

	int errorcode = -result;

	if (strerror_r (errorcode, message_buf, BUF_SIZE))
	{
	/* This would mean that message_buf was to small
	* to hold the error message.
	*/
	JCL_ThrowException (env, "java/lang/InternalError",
	"Not enough space in message buffer.");
	return 0;
	}

	JCL_ThrowException (env, "java/io/IOException", message_buf);
	return 0;
	}

	/* Set the file descriptors according to the values returned from select(). */
	helper_get_filedescriptors (env, read, &read_fds);
	helper_get_filedescriptors (env, write, &write_fds);
	helper_get_filedescriptors (env, except, &except_fds);

	return result;
	}