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LIO_LISTIO(2)		  FreeBSD System Calls Manual		 LIO_LISTIO(2)

NAME
     lio_listio	-- list	directed I/O (REALTIME)

LIBRARY
     Standard C	Library	(libc, -lc)

SYNOPSIS
     #include <aio.h>

     int
     lio_listio(int mode, struct aiocb * const list[], int nent,
	 struct	sigevent *sig);

DESCRIPTION
     The lio_listio() function initiates a list	of I/O requests	with a single
     function call.  The list argument is an array of pointers to aiocb	struc-
     tures describing each operation to	perform, with nent elements.  NULL
     elements are ignored.

     The aio_lio_opcode	field of each aiocb specifies the operation to be per-
     formed.  The following operations are supported:

     LIO_READ	Read data as if	by a call to aio_read(2).

     LIO_NOP	No operation.

     LIO_WRITE	Write data as if by a call to aio_write(2).

     If	the mode argument is LIO_WAIT, lio_listio() does not return until all
     the requested operations have been	completed.  If mode is LIO_NOWAIT, the
     requests are processed asynchronously, and	the signal specified by	sig is
     sent when all operations have completed.  If sig is NULL, the calling
     process is	not notified of	I/O completion.

     The order in which	the requests are carried out is	not specified; in par-
     ticular, there is no guarantee that they will be executed in the order 0,
     1,	..., nent-1.

RETURN VALUES
     If	mode is	LIO_WAIT, the lio_listio() function returns 0 if the opera-
     tions completed successfully, otherwise -1.

     If	mode is	LIO_NOWAIT, the	lio_listio() function returns 0	if the opera-
     tions are successfully queued, otherwise -1.

ERRORS
     The lio_listio() function will fail if:

     [EAGAIN]		There are not enough resources to enqueue the
			requests.

     [EAGAIN]		The request would cause	the system-wide	limit AIO_MAX
			to be exceeded.

     [EINVAL]		The mode argument is neither LIO_WAIT nor LIO_NOWAIT,
			or nent	is greater than	AIO_LISTIO_MAX.

     [EINTR]		A signal interrupted the system	call before it could
			be completed.

     [EIO]		One or more requests failed.

     In	addition, the lio_listio() function may	fail for any of	the reasons
     listed for	aio_read(2) and	aio_write(2).

     If	lio_listio() succeeds, or fails	with an	error code of EAGAIN, EINTR,
     or	EIO, some of the requests may have been	initiated.  The	caller should
     check the error status of each aiocb structure individually by calling
     aio_error(2).

SEE ALSO
     aio_error(2), aio_read(2),	aio_write(2), read(2), write(2), siginfo(3),
     aio(4)

STANDARDS
     The lio_listio() function is expected to conform to IEEE Std 1003.1-2001
     (``POSIX.1'').

FreeBSD	10.1		       January 12, 2003			  FreeBSD 10.1

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | SEE ALSO | STANDARDS

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