forked from 0ad/0ad
126 lines
3.4 KiB
C
126 lines
3.4 KiB
C
/**
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* =========================================================================
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* File : waio.h
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* Project : 0 A.D.
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* Description : emulate POSIX asynchronous I/O on Windows.
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* =========================================================================
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*/
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// license: GPL; see lib/license.txt
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#ifndef INCLUDED_WAIO
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#define INCLUDED_WAIO
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#include "wposix_types.h"
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#include "no_crt_posix.h"
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// Note: for maximum efficiency, transfer buffers, offsets, and lengths
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// should be sector aligned (otherwise, buffer is copied).
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//
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// <signal.h>
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//
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union sigval
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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
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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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// <fcntl.h>
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//
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// .. Win32-only (not specified by POSIX)
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#define O_TEXT_NP 0x4000 // file mode is text (translated)
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#define O_BINARY_NP 0x8000 // file mode is binary (untranslated)
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// .. wposix.cpp only (bit values not used by MS _open)
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#define O_NO_AIO_NP 0x20000
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// wposix-specific: do not open a separate AIO-capable handle.
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// this is used for small files where AIO overhead isn't worth it,
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// thus speeding up loading and reducing resource usage.
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// .. not supported by Win32 (bit values not used by MS _open)
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#define O_NONBLOCK 0x1000000
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// redefinition error here => io.h is getting included somewhere.
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// we implement this function, so the io.h definition conflicts if
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// compiling against the DLL CRT. either rename the io.h def
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// (as with vc_stat), or don't include io.h.
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extern int open(const char* fn, int mode, ...);
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extern int close(int);
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//
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// <unistd.h>
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//
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extern int read (int fd, void* buf, size_t nbytes); // thunk
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extern int write(int fd, void* buf, size_t nbytes); // thunk
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extern off_t lseek(int fd, off_t ofs, int whence); // thunk
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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.
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struct sigevent aio_sigevent; // Signal number and value.
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int aio_lio_opcode; // Operation to be performed.
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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_cancel(int, struct aiocb*);
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extern int aio_error(const struct aiocb*);
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extern int aio_fsync(int, struct aiocb*);
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extern int aio_read(struct aiocb*);
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extern ssize_t aio_return(struct aiocb*);
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struct timespec;
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extern int aio_suspend(const struct aiocb* const[], int, const struct timespec*);
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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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extern int aio_close(int fd);
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extern int aio_reopen(int fd, const char* fn, int oflag, ...);
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// allocate and return a file descriptor
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extern int aio_assign_handle(uintptr_t handle);
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#endif // #ifndef INCLUDED_WAIO
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