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// natSelectorImplWin32.cc
/* Copyright (C) 2003 Free Software Foundation
This file is part of libgcj.
This software is copyrighted work licensed under the terms of the
Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
details. */
#include <config.h>
#include <platform.h>
#include <errno.h>
#include <string.h>
#include <gnu/java/nio/SelectorImpl.h>
#include <java/io/IOException.h>
void
helper_put_filedescriptors (jintArray fdArray, fd_set& fds, int& max_fd)
{
jint* tmpFDArray = elements (fdArray);
for (int index = 0; index < JvGetArrayLength (fdArray); index++)
{
FD_SET (tmpFDArray [index], &fds);
if (tmpFDArray [index] > max_fd)
max_fd = tmpFDArray [index];
}
}
void
helper_get_filedescriptors (jintArray& fdArray, fd_set fds)
{
jint* tmpFDArray = elements (fdArray);
for (int index = 0; index < JvGetArrayLength (fdArray); index++)
if (!FD_ISSET (tmpFDArray [index], &fds))
tmpFDArray [index] = 0;
}
jint
gnu::java::nio::SelectorImpl::implSelect (jintArray read, jintArray write,
jintArray except, jlong timeout)
{
jint result;
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;
real_time_data.tv_sec = 0;
real_time_data.tv_usec = timeout;
// If not legal timeout value is given, use NULL.
// This means an infinite timeout.
if (timeout >= 0)
{
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 (read, read_fds, max_fd);
helper_put_filedescriptors (write, write_fds, max_fd);
helper_put_filedescriptors (except, except_fds, max_fd);
// Actually do the select
result = _Jv_select (max_fd + 1, &read_fds, &write_fds, &except_fds, time_data);
if (result < 0)
{
char* strerr = strerror (errno);
throw new ::java::io::IOException (JvNewStringUTF (strerr));
}
// Set the file descriptors according to the values returned from select().
helper_get_filedescriptors (read, read_fds);
helper_get_filedescriptors (write, write_fds);
helper_get_filedescriptors (except, except_fds);
return result;
}
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