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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 *restrict const aiocb_list[restrict],
                      int nitems, struct sigevent *restrict 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, asynchronous 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.

       EINTR  mode was LIO_WAIT and a signal was caught before all I/O operations completed; see signal(7).  (This may even be one of the signals used for  asynchronous
              I/O completion notification.)

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

       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_listio() 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.

ATTRIBUTES
       For an explanation of the terms used in this section, see attributes(7).

       β”Œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”¬β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”¬β”€β”€β”€β”€β”€β”€β”€β”€β”€β”
       β”‚Interface                                                                                                                             β”‚ Attribute     β”‚ Value   β”‚
       β”œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”Όβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”Όβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€
       β”‚lio_listio()                                                                                                                          β”‚ Thread safety β”‚ MT-Safe β”‚
       β””β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”΄β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”΄β”€β”€β”€β”€β”€β”€β”€β”€β”€β”˜

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)

                                                                               2021-03-22                                                                  LIO_LISTIO(3)