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NetBSD 6.1.5 - man page for lio_listio (netbsd section 3)

LIO_LISTIO(3)			   BSD Library Functions Manual 		    LIO_LISTIO(3)

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

LIBRARY
     POSIX Real-time Library (librt, -lrt)

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 structures describing each operation to per-
     form, with nent elements.	NULL elements are ignored.

     The aio_lio_opcode field of each aiocb specifies the operation to be performed.  The follow-
     ing operations are supported:

	   LIO_READ   Read data as if by a call to aio_read(3).

	   LIO_NOP    No operation.

	   LIO_WRITE  Write data as if by a call to aio_write(3).

     If the mode argument is LIO_WAIT, lio_listio() does not return until all the requested oper-
     ations have been completed.  If mode is LIO_NOWAIT, the requests are processed asyn-
     chronously, 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, and there is no guarantee
     that they will be executed sequentially.

RETURN VALUES
     If mode is LIO_WAIT, the lio_listio() function returns 0 if the operations completed suc-
     cessfully, otherwise -1.

     If mode is LIO_NOWAIT, the lio_listio() function returns 0 if the operations are success-
     fully queued, otherwise -1.

ERRORS
     The lio_listio() function will fail if:

     [EAGAIN]		There are not enough resources to enqueue the requests; or the request
			would cause the system-wide limit AIO_MAX to be exceeded.

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

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

     [EIO]		One or more requests failed.

     In addition, the lio_listio() function may fail for any of the reasons listed for
     aio_read(3) and aio_write(3).

     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(3).

SEE ALSO
     read(2), siginfo(2), write(2), aio(3), sigevent(3)

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

BSD					 August 12, 2011				      BSD


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