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-'\" t
-.\" Copyright (C) 2010, Michael Kerrisk <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: GPL-2.0-or-later
-.\"
-.TH lio_listio 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-lio_listio \- initiate a list of I/O requests
-.SH LIBRARY
-Real-time library
-.RI ( librt ", " \-lrt )
-.SH SYNOPSIS
-.nf
-.B "#include <aio.h>"
-.P
-.BI "int lio_listio(int " mode ,
-.BI "               struct aiocb *restrict const " aiocb_list [restrict],
-.BI "               int " nitems ", struct sigevent *restrict " sevp );
-.fi
-.SH DESCRIPTION
-The
-.BR lio_listio ()
-function initiates the list of I/O operations described by the array
-.IR aiocb_list .
-.P
-The
-.I mode
-operation has one of the following values:
-.TP
-.B LIO_WAIT
-The call blocks until all operations are complete.
-The
-.I sevp
-argument is ignored.
-.TP
-.B LIO_NOWAIT
-The I/O operations are queued for processing and the call returns immediately.
-When all of the I/O operations complete, asynchronous notification occurs,
-as specified by the
-.I sevp
-argument; see
-.BR sigevent (3type)
-for details.
-If
-.I sevp
-is NULL, no asynchronous notification occurs.
-.P
-The
-.I aiocb_list
-argument is an array of pointers to
-.I aiocb
-structures that describe I/O operations.
-These operations are executed in an unspecified order.
-The
-.I nitems
-argument specifies the size of the array
-.IR aiocb_list .
-Null pointers in
-.I aiocb_list
-are ignored.
-.P
-In each control block in
-.IR aiocb_list ,
-the
-.I aio_lio_opcode
-field specifies the I/O operation to be initiated, as follows:
-.TP
-.B LIO_READ
-Initiate a read operation.
-The operation is queued as for a call to
-.BR aio_read (3)
-specifying this control block.
-.TP
-.B LIO_WRITE
-Initiate a write operation.
-The operation is queued as for a call to
-.BR aio_write (3)
-specifying this control block.
-.TP
-.B LIO_NOP
-Ignore this control block.
-.P
-The remaining fields in each control block have the same meanings as for
-.BR aio_read (3)
-and
-.BR aio_write (3).
-The
-.I aio_sigevent
-fields of each control block can be used to specify notifications
-for the individual I/O operations (see
-.BR sigevent (7)).
-.SH RETURN VALUE
-If
-.I mode
-is
-.BR LIO_NOWAIT ,
-.BR lio_listio ()
-returns 0 if all I/O operations are successfully queued.
-Otherwise, \-1 is returned, and
-.I errno
-is set to indicate the error.
-.P
-If
-.I mode
-is
-.BR LIO_WAIT ,
-.BR lio_listio ()
-returns 0 when all of the I/O operations have completed successfully.
-Otherwise, \-1 is returned, and
-.I errno
-is set to indicate the error.
-.P
-The return status from
-.BR lio_listio ()
-provides information only about the call itself,
-not about the individual I/O operations.
-One or more of the I/O operations may fail,
-but this does not prevent other operations completing.
-The status of individual I/O operations in
-.I aiocb_list
-can be determined using
-.BR aio_error (3).
-When an operation has completed,
-its return status can be obtained using
-.BR aio_return (3).
-Individual I/O operations can fail for the reasons described in
-.BR aio_read (3)
-and
-.BR aio_write (3).
-.SH ERRORS
-The
-.BR lio_listio ()
-function may fail for the following reasons:
-.TP
-.B EAGAIN
-Out of resources.
-.TP
-.B EAGAIN
-.\" Doesn't happen in glibc(?)
-The number of I/O operations specified by
-.I nitems
-would cause the limit
-.B AIO_MAX
-to be exceeded.
-.TP
-.B EINTR
-.I mode
-was
-.B LIO_WAIT
-and a signal
-was caught before all I/O operations completed; see
-.BR signal (7).
-(This may even be one of the signals used for
-asynchronous I/O completion notification.)
-.TP
-.B EINVAL
-.I mode
-is invalid, or
-.\" Doesn't happen in glibc(?)
-.I nitems
-exceeds the limit
-.BR AIO_LISTIO_MAX .
-.TP
-.B EIO
-One of more of the operations specified by
-.I aiocb_list
-failed.
-.\" e.g., ioa_reqprio or aio_lio_opcode was invalid
-The application can check the status of each operation using
-.BR aio_return (3).
-.P
-If
-.BR lio_listio ()
-fails with the error
-.BR EAGAIN ,
-.BR EINTR ,
-or
-.BR EIO ,
-then some of the operations in
-.I aiocb_list
-may have been initiated.
-If
-.BR lio_listio ()
-fails for any other reason,
-then none of the I/O operations has been initiated.
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface	Attribute	Value
-T{
-.na
-.nh
-.BR lio_listio ()
-T}	Thread safety	MT-Safe
-.TE
-.SH STANDARDS
-POSIX.1-2008.
-.SH HISTORY
-glibc 2.1.
-POSIX.1-2001.
-.SH NOTES
-It is a good idea to zero out the control blocks before use.
-The control blocks must not be changed while the I/O operations
-are in progress.
-The buffer areas being read into or written from
-.\" or the control block of the operation
-must not be accessed during the operations or undefined results may occur.
-The memory areas involved must remain valid.
-.P
-Simultaneous I/O operations specifying the same
-.I aiocb
-structure produce undefined results.
-.SH SEE ALSO
-.BR aio_cancel (3),
-.BR aio_error (3),
-.BR aio_fsync (3),
-.BR aio_return (3),
-.BR aio_suspend (3),
-.BR aio_write (3),
-.BR aio (7)