cc [options] -Kthread file
int lio_listio(int mode, struct aiocb *list, int nent,struct sigevent *sig);
int lio_listio64(int mode, struct aiocb64 *list, int nent,struct sigevent *sig);
The mode argument takes one of the values LIO_WAIT or LIO_NOWAIT and determines whether the function returns when the I/O operations have been completed, or as soon as the operations have been queued. If the mode argument is LIO_WAIT, the function waits until all I/O is complete and the sig argument is ignored.
When LIO_WAIT is selected, lio_listio waits for all requests that were successfully queued to complete before returning. If no requests were successfully queued, it returns immediately.
If the mode argument is LIO_NOWAIT, the function returns immediately, and completion notification occurs according to the sig argument, when all the I/O operations complete. If sig is NULL, no notification occurs. If sig is not NULL, notification occurs according to the same rules as the aio_sigevent aiocb field.
The list argument is an array of pointers to aiocb structures. The array contains nent elements. The array may contain NULL elements which are ignored.
The I/O requests enumerated by list are submitted in an unspecified order.
The aio_lio_opcode field of each aiocb structure specifies the operation to be performed. The supported operations are LIO_READ, LIO_WRITE, and LIO_NOP. The LIO_NOP operation causes the list entry to be ignored. If the aio_lio_opcode element is equal to LIO_READ, an I/O operation is submitted as if by a call to aio_read with the aiocb equal to the address of the aiocb structure. If the aio_lio_opcode element is equal to LIO_WRITE, an I/O operation is submitted as if by a call to aio_write with the aiocb equal to the address of the aiocb structure.
Other aiocb structure members (i.e.
aio_nbytes, etc) are set in a manner equivalent to
how they would be
set if you use them in a direct call to aio_write or aio_read.
The nent argument specifies how many elements are members of the list, or the length of the array.
The sig argument is a pointer to a signal control structure, used when the mode argument has the value LIO_NOWAIT, which defines the notification to be issued when the entire list of I/O requests have been completed.
The behavior of lio_listio is altered according to the definitions of synchronized I/O data integrity completion and synchronized I/O file integrity completion if synchronized I/O is enabled on the file associated with the requests.
Mixing of requests with and without the AIO_RAW
flag set in
aio_flags is supported. The implementation should,
but is not required to, return an error if this is attempted.
The setting of the AIO_RAW
flag can be determined by examing the first request in
If the mode argument has the value LIO_WAIT, the lio_listio and lio_listio64 functions return zero when all the indicated I/O has completed successfully. Otherwise, lio_listio and lio_listio64 return a value of -1 and set errno to indicate the error.
Both of these return values only indicate the success or failure of the lio_listio and lio_listio64 calls themselves, not the status of the individual I/O requests. In some cases one or more of the I/O requests contained in the list may fail. Failure of an individual request does not prevent completion of any other individual request. To determine the outcome of each I/O request, the application examines the error status associated with each lio_aiocb control block. The error statuses returned are identical to those returned as the result of an aio_read or aio_write function.
aiocbp->aio_lio_opcodeis LIO_WRITE, the file is a regular file,
aiocbp->aio_nbytesis greater than 0, and the starting offset in
aiocbp->aio_offsetis greater than or equal to the offset maximum in the open file descriptor associated with
aiocbp->aio_lio_opcodeis LIO_READ, the file is a regular file,
aiocbp->aio_nbytesis greater than 0, and the
aiocbp->aio_offsetis before the end-of-file and is greater than or equal to the offset maximum in the open file descriptor associated with
If any of the following conditions occur, the lio_listio and the lio_listio64 function return -1 and set errno to: