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149baf116b
Use `<filesystem>` instead of `truncate` and remove `truncate` portability wrapper. Add a helper function `StatusFromSystemError` to convert error_code to `Status`. Signed-off-by: Ralph Sennhauser <ralph.sennhauser@gmail.com>
144 lines
4.9 KiB
C
144 lines
4.9 KiB
C
/* Copyright (C) 2026 Wildfire Games.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/*
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* emulate POSIX asynchronous I/O on Windows.
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*/
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#ifndef INCLUDED_WAIO
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#define INCLUDED_WAIO
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#include "lib/status.h"
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#include "lib/os_path.h"
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#include "lib/sysdep/os/win/wposix/wposix_types.h"
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#include <ctime>
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// Note: transfer buffers, offsets, and lengths must be sector-aligned
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// (we don't bother copying to an align buffer because our block cache
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// already requires splitting IOs into naturally-aligned blocks)
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//
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// <signal.h>
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//
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union sigval // unused
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{
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int sival_int; // Integer signal value.
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void* sival_ptr; // Pointer signal value.
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};
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struct sigevent // unused
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{
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int sigev_notify; // notification mode
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int sigev_signo; // signal number
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union sigval sigev_value; // signal value
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void (*sigev_notify_function)(union sigval);
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};
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//
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// <aio.h>
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//
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struct aiocb
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{
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int aio_fildes; // File descriptor.
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off_t aio_offset; // File offset.
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volatile void* aio_buf; // Location of buffer.
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size_t aio_nbytes; // Length of transfer.
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int aio_reqprio; // Request priority offset. (unused)
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struct sigevent aio_sigevent; // Signal number and value. (unused)
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int aio_lio_opcode; // Operation to be performed.
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// internal use only; must be zero-initialized before
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// calling the first aio_read/aio_write/lio_listio
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// (aio_return resets it to 0)
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void* ovl;
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};
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enum
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{
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// aio_cancel return
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AIO_ALLDONE, // None of the requested operations could be canceled since they are already complete.
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AIO_CANCELED, // All requested operations have been canceled.
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AIO_NOTCANCELED, // Some of the requested operations could not be canceled since they are in progress.
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// lio_listio mode
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LIO_WAIT, // wait until all I/O is complete
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LIO_NOWAIT,
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// lio_listio ops
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LIO_NOP,
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LIO_READ,
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LIO_WRITE
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};
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extern int aio_read(struct aiocb*);
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extern int aio_write(struct aiocb*);
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extern int lio_listio(int, struct aiocb* const[], int, struct sigevent*);
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// (if never called, IOCP notifications will pile up.)
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extern int aio_suspend(const struct aiocb* const[], int, const struct timespec*);
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// @return status of transfer (0 or an errno)
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extern int aio_error(const struct aiocb*);
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// @return bytes transferred or -1 on error.
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// frees internal storage related to the request and MUST be called
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// exactly once for each aiocb after aio_error != EINPROGRESS.
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extern ssize_t aio_return(struct aiocb*);
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extern int aio_cancel(int, struct aiocb*);
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extern int aio_fsync(int, struct aiocb*);
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// open the file for aio (not possible via _wsopen_s since it cannot
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// set FILE_FLAG_NO_BUFFERING).
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//
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// @return the smallest available file descriptor. NB: these numbers
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// are not 0-based to avoid confusion with lowio descriptors and
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// must only be used with waio functions.
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extern Status waio_open(const OsPath& pathname, int oflag, ...);
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extern Status waio_close(int fd);
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// call this before writing a large file to preallocate clusters, thus
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// reducing fragmentation.
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//
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// @param fd file descriptor from _wsopen_s OR waio_open
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// @param size is rounded up to a multiple of maxSectorSize (required by
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// SetEndOfFile; this could be avoided by using the undocumented
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// NtSetInformationFile or SetFileInformationByHandle on Vista and later).
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// use truncate after I/O is complete to chop off the excess padding.
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//
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// NB: writes that extend a file (i.e. ALL WRITES when creating new files)
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// are synchronous, which prevents overlapping I/O and other work.
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// (http://support.microsoft.com/default.aspx?scid=kb%3Ben-us%3B156932)
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// if Windows XP and the SE_MANAGE_VOLUME_NAME privileges are available,
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// this function sets the valid data length to avoid the synchronous zero-fill.
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// to avoid exposing the previous disk contents until the application
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// successfully writes to the file, deny sharing when opening the file.
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Status waio_Preallocate(int fd, off_t size);
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#endif // #ifndef INCLUDED_WAIO
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