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LEARN ABOUT CENTOS

lio_listio

LIO_LISTIO(3)						     Linux Programmer's Manual						     LIO_LISTIO(3)

NAME

       lio_listio - initiate a list of I/O requests

SYNOPSIS

       #include <aio.h>

       int lio_listio(int mode, struct aiocb *const aiocb_list[],
		      int nitems, struct sigevent *sevp);

       Link with -lrt.

DESCRIPTION

       The lio_listio() function initiates the list of I/O operations described by the array aiocb_list.

       The mode operation has one of the following values:

       LIO_WAIT    The call blocks until all operations are complete.  The sevp argument is ignored.

       LIO_NOWAIT  The	I/O operations are queued for processing and the call returns immediately.  When all of the I/O operations complete, asyn-
		   chronous notification occurs, as specified by the sevp argument; see sigevent(7) for details.  If sevp is NULL, no asynchronous
		   notification occurs.

       The  aiocb_list	argument  is  an  array of pointers to aiocb structures that describe I/O operations.  These operations are executed in an
       unspecified order.  The nitems argument specifies the size of the array aiocb_list.  NULL pointers in aiocb_list are ignored.

       In each control block in aiocb_list, the aio_lio_opcode field specifies the I/O operation to be initiated, as follows:

       LIO_READ  Initiate a read operation.  The operation is queued as for a call to aio_read(3) specifying this control block.

       LIO_WRITE Initiate a write operation.  The operation is queued as for a call to aio_write(3) specifying this control block.

       LIO_NOP	 Ignore this control block.

       The remaining fields in each control block have the same meanings as for aio_read(3) and aio_write(3).  The  aio_sigevent  fields  of  each
       control block can be used to specify notifications for the individual I/O operations (see sigevent(7)).

RETURN VALUE

       If  mode  is LIO_NOWAIT, lio_listio() returns 0 if all I/O operations are successfully queued.  Otherwise, -1 is returned, and errno is set
       to indicate the error.

       If mode is LIO_WAIT, lio_listio() returns 0 when all of the I/O operations have completed successfully.	Otherwise,  -1	is  returned,  and
       errno is set to indicate the error.

       The  return status from 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
       aiocb_list  can	be determined using aio_error(3).  When an operation has completed, its return status can be obtained using aio_return(3).
       Individual I/O operations can fail for the reasons described in aio_read(3) and aio_write(3).

ERRORS

       The lio_listio() function may fail for the following reasons:

       EAGAIN Out of resources.

       EAGAIN The number of I/O operations specified by nitems would cause the limit AIO_MAX to be exceeded.

       EINVAL mode is invalid, or nitems exceeds the limit AIO_LISTIO_MAX.

       EINTR  mode was LIO_WAIT and a signal was caught before all I/O operations completed.  (This may even be one of the signals used for  asyn-
	      chronous I/O completion notification.)

       EIO    One  of  more  of  the  operations  specified  by  aiocb_list  failed.  The application can check the status of each operation using
	      aio_return(3).

       If lio_listio() fails with the error EAGAIN, EINTR, or EIO, then some of the operations in aiocb_list may have been initiated.  If lio_lis-
       tio() fails for any other reason, then none of the I/O operations has been initiated.

VERSIONS

       The lio_listio() function is available since glibc 2.1.

CONFORMING TO

       POSIX.1-2001, POSIX.1-2008.

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 must not be accessed during the operations or undefined results may occur.  The
       memory areas involved must remain valid.

       Simultaneous I/O operations specifying the same aiocb structure produce undefined results.

SEE ALSO

       aio_cancel(3), aio_error(3), aio_fsync(3), aio_return(3), aio_suspend(3), aio_write(3), aio(7)

COLOPHON

       This  page is part of release 3.53 of the Linux man-pages project.  A description of the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

								    2012-05-08							     LIO_LISTIO(3)

Programming