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aio.h(0P)		   POSIX Programmer's Manual		     aio.h(0P)

PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the	 corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.

NAME
       aio.h — asynchronous input and output

SYNOPSIS
       #include <aio.h>

DESCRIPTION
       The <aio.h> header  shall  define  the  aiocb  structure,  which	 shall
       include at least the following members:

	   int		   aio_fildes	  File descriptor.
	   off_t	   aio_offset	  File offset.
	   volatile void  *aio_buf	  Location of buffer.
	   size_t	   aio_nbytes	  Length of transfer.
	   int		   aio_reqprio	  Request priority offset.
	   struct sigevent aio_sigevent	  Signal number and value.
	   int		   aio_lio_opcode Operation to be performed.

       The  <aio.h> header shall define the off_t, pthread_attr_t, size_t, and
       ssize_t types as described in <sys/types.h>.

       The <aio.h> header  shall  define  the  struct  timespec	 structure  as
       described in <time.h>.

       The  tag	 sigevent  shall be declared as naming an incomplete structure
       type, the contents of which are described in the <signal.h> header.

       The <aio.h> header shall define the following symbolic constants:

       AIO_ALLDONE   A return value indicating	that  none  of	the  requested
		     operations	 could be canceled since they are already com‐
		     plete.

       AIO_CANCELED  A return value indicating that all	 requested  operations
		     have been canceled.

       AIO_NOTCANCELED
		     A	return	value  indicating  that	 some of the requested
		     operations could  not  be	canceled  since	 they  are  in
		     progress.

       LIO_NOP	     A	lio_listio()  element operation option indicating that
		     no transfer is requested.

       LIO_NOWAIT    A lio_listio() synchronization operation indicating  that
		     the  calling  thread  is  to continue execution while the
		     lio_listio() operation is being performed, and no notifi‐
		     cation is given when the operation is complete.

       LIO_READ	     A	lio_listio()  element  operation  option  requesting a
		     read.

       LIO_WAIT	     A lio_listio() synchronization operation indicating  that
		     the  calling  thread is to suspend until the lio_listio()
		     operation is complete.

       LIO_WRITE     A lio_listio()  element  operation	 option	 requesting  a
		     write.

       The following shall be declared as functions and may also be defined as
       macros. Function prototypes shall be provided.

	   int	    aio_cancel(int, struct aiocb *);
	   int	    aio_error(const struct aiocb *);
	   int	    aio_fsync(int, struct aiocb *);
	   int	    aio_read(struct aiocb *);
	   ssize_t  aio_return(struct aiocb *);
	   int	    aio_suspend(const struct aiocb *const [], int,
			const struct timespec *);
	   int	    aio_write(struct aiocb *);
	   int	    lio_listio(int, struct aiocb *restrict const [restrict], int,
			struct sigevent *restrict);

       Inclusion of the <aio.h> header may make visible symbols defined in the
       headers <fcntl.h>, <signal.h>, and <time.h>.

       The following sections are informative.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       <fcntl.h>, <signal.h>, <sys_types.h>, <time.h>

       The   System   Interfaces   volume   of	 POSIX.1‐2008,	 aio_cancel(),
       aio_error(),  aio_fsync(),  aio_read(),	aio_return(),	aio_suspend(),
       aio_write(), fsync(), lio_listio(), lseek(), read(), write()

COPYRIGHT
       Portions	 of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       --  Portable  Operating	System	Interface (POSIX), The Open Group Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
       cal  and	 Electronics  Engineers,  Inc  and  The	 Open Group.  (This is
       POSIX.1-2008 with the 2013 Technical Corrigendum	 1  applied.)  In  the
       event of any discrepancy between this version and the original IEEE and
       The Open Group Standard, the original IEEE and The Open Group  Standard
       is  the	referee document. The original Standard can be obtained online
       at http://www.unix.org/online.html .

       Any typographical or formatting errors that appear  in  this  page  are
       most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors,	 see  https://www.ker‐
       nel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group		     2013			     aio.h(0P)
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