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/***************************************************************************
* lib/io/syscall_file.cpp
*
* Part of the STXXL. See http://stxxl.sourceforge.net
*
* Copyright (C) 2002 Roman Dementiev <dementiev@mpi-sb.mpg.de>
* Copyright (C) 2008, 2010 Andreas Beckmann <beckmann@cs.uni-frankfurt.de>
* Copyright (C) 2010 Johannes Singler <singler@kit.edu>
*
* Distributed under the Boost Software License, Version 1.0.
* (See accompanying file LICENSE_1_0.txt or copy at
* http://www.boost.org/LICENSE_1_0.txt)
**************************************************************************/
#include <stxxl/bits/common/error_handling.h>
#include <stxxl/bits/common/mutex.h>
#include <stxxl/bits/config.h>
#include <stxxl/bits/io/iostats.h>
#include <stxxl/bits/io/request.h>
#include <stxxl/bits/io/request_interface.h>
#include <stxxl/bits/io/syscall_file.h>
#include "ufs_platform.h"
STXXL_BEGIN_NAMESPACE
void syscall_file::serve(void* buffer, offset_type offset, size_type bytes,
request::request_type type)
{
scoped_mutex_lock fd_lock(fd_mutex);
char* cbuffer = static_cast<char*>(buffer);
stats::scoped_read_write_timer read_write_timer(bytes, type == request::WRITE);
while (bytes > 0)
{
off_t rc = ::lseek(file_des, offset, SEEK_SET);
if (rc < 0)
{
STXXL_THROW_ERRNO
(io_error,
" this=" << this <<
" call=::lseek(fd,offset,SEEK_SET)" <<
" path=" << filename <<
" fd=" << file_des <<
" offset=" << offset <<
" buffer=" << cbuffer <<
" bytes=" << bytes <<
" type=" << ((type == request::READ) ? "READ" : "WRITE") <<
" rc=" << rc);
}
if (type == request::READ)
{
#if STXXL_MSVC
assert(bytes <= std::numeric_limits<unsigned int>::max());
if ((rc = ::read(file_des, cbuffer, (unsigned int)bytes)) <= 0)
#else
if ((rc = ::read(file_des, cbuffer, bytes)) <= 0)
#endif
{
STXXL_THROW_ERRNO
(io_error,
" this=" << this <<
" call=::read(fd,buffer,bytes)" <<
" path=" << filename <<
" fd=" << file_des <<
" offset=" << offset <<
" buffer=" << buffer <<
" bytes=" << bytes <<
" type=" << "READ" <<
" rc=" << rc);
}
bytes = (size_type)(bytes - rc);
offset += rc;
cbuffer += rc;
if (bytes > 0 && offset == this->_size())
{
// read request extends past end-of-file
// fill reminder with zeroes
memset(cbuffer, 0, bytes);
bytes = 0;
}
}
else
{
#if STXXL_MSVC
assert(bytes <= std::numeric_limits<unsigned int>::max());
if ((rc = ::write(file_des, cbuffer, (unsigned int)bytes)) <= 0)
#else
if ((rc = ::write(file_des, cbuffer, bytes)) <= 0)
#endif
{
STXXL_THROW_ERRNO
(io_error,
" this=" << this <<
" call=::write(fd,buffer,bytes)" <<
" path=" << filename <<
" fd=" << file_des <<
" offset=" << offset <<
" buffer=" << buffer <<
" bytes=" << bytes <<
" type=" << "WRITE" <<
" rc=" << rc);
}
bytes = (size_type)(bytes - rc);
offset += rc;
cbuffer += rc;
}
}
}
const char* syscall_file::io_type() const
{
return "syscall";
}
STXXL_END_NAMESPACE
// vim: et:ts=4:sw=4
|
