131 lines
3.0 KiB
C++
131 lines
3.0 KiB
C++
/* Copyright (C) 2009 Wildfire Games.
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* This file is part of 0 A.D.
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*
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* 0 A.D. is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* 0 A.D. is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* simple POSIX file wrapper.
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*/
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#include "precompiled.h"
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#include "file.h"
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#include "lib/file/common/file_stats.h"
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#include "lib/sysdep/sysdep.h" // sys_wopen
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ERROR_ASSOCIATE(ERR::FILE_ACCESS, L"Insufficient access rights to open file", EACCES);
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ERROR_ASSOCIATE(ERR::IO, L"Error during IO", EIO);
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namespace FileImpl {
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LibError Open(const fs::wpath& pathname, wchar_t mode, int& fd)
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{
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int oflag = -1;
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switch(mode)
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{
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case 'r':
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oflag = O_RDONLY;
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break;
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case 'w':
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oflag = O_WRONLY|O_CREAT|O_TRUNC;
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break;
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case '+':
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oflag = O_RDWR;
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break;
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default:
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debug_assert(0);
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}
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#if OS_WIN
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oflag |= O_BINARY_NP;
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#endif
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fd = sys_wopen(pathname.string().c_str(), oflag, S_IRWXO|S_IRWXU|S_IRWXG);
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if(fd < 0)
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WARN_RETURN(ERR::FILE_ACCESS);
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stats_open();
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return INFO::OK;
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}
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void Close(int& fd)
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{
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if(fd)
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{
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close(fd);
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fd = 0;
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}
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}
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LibError IO(int fd, wchar_t mode, off_t ofs, u8* buf, size_t size)
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{
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debug_assert(mode == 'r' || mode == 'w');
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ScopedIoMonitor monitor;
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lseek(fd, ofs, SEEK_SET);
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errno = 0;
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const ssize_t ret = (mode == 'w')? write(fd, buf, size) : read(fd, buf, size);
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if(ret < 0)
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return LibError_from_errno();
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const size_t totalTransferred = (size_t)ret;
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if(totalTransferred != size)
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WARN_RETURN(ERR::IO);
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monitor.NotifyOfSuccess(FI_LOWIO, mode, totalTransferred);
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return INFO::OK;
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}
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LibError Issue(aiocb& req, int fd, wchar_t mode, off_t alignedOfs, u8* alignedBuf, size_t alignedSize)
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{
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memset(&req, 0, sizeof(req));
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req.aio_lio_opcode = (mode == 'w')? LIO_WRITE : LIO_READ;
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req.aio_buf = (volatile void*)alignedBuf;
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req.aio_fildes = fd;
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req.aio_offset = alignedOfs;
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req.aio_nbytes = alignedSize;
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struct sigevent* sig = 0; // no notification signal
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aiocb* const reqs = &req;
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if(lio_listio(LIO_NOWAIT, &reqs, 1, sig) != 0)
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return LibError_from_errno();
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return INFO::OK;
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}
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LibError WaitUntilComplete(aiocb& req, u8*& alignedBuf, size_t& alignedSize)
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{
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// wait for transfer to complete.
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while(aio_error(&req) == EINPROGRESS)
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{
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aiocb* const reqs = &req;
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aio_suspend(&reqs, 1, (timespec*)0); // wait indefinitely
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}
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const ssize_t bytesTransferred = aio_return(&req);
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if(bytesTransferred == -1) // transfer failed
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WARN_RETURN(ERR::IO);
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alignedBuf = (u8*)req.aio_buf; // cast from volatile void*
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alignedSize = bytesTransferred;
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return INFO::OK;
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}
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} // namespace FileImpl
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