GSP
Quick Navigator

Search Site

Unix VPS
A - Starter
B - Basic
C - Preferred
D - Commercial
MPS - Dedicated
Previous VPSs
* Sign Up! *

Support
Contact Us
Online Help
Handbooks
Domain Status
Man Pages

FAQ
Virtual Servers
Pricing
Billing
Technical

Network
Facilities
Connectivity
Topology Map

Miscellaneous
Server Agreement
Year 2038
Credits
 

USA Flag

 

 

Man Pages
LIO_LISTIO(2) FreeBSD System Calls Manual LIO_LISTIO(2)

lio_listio
list directed I/O (REALTIME)

Standard C Library (libc, -lc)

#include <aio.h>

int
lio_listio(int mode, struct aiocb * const list[], int nent, struct sigevent *sig);

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 perform, with nent elements. NULL elements are ignored.

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

Read data as if by a call to aio_read(2).
No operation.
Write data as if by a call to aio_write(2).

If the mode argument is LIO_WAIT, lio_listio() does not return until all the requested operations have been completed. If mode is LIO_NOWAIT, sig can be used to request asynchronous notification when all operations have completed. If sig is NULL, no notification is sent.

For SIGEV_KEVENT notifications, the posted kevent will contain:

Member Value
ident list
filter
udata value stored in sig->sigev_value

For SIGEV_SIGNO and SIGEV_THREAD_ID notifications, the information for the queued signal will include SI_ASYNCIO in the si_code field and the value stored in sig->sigev_value in the si_value field.

For SIGEV_THREAD notifications, the value stored in sig->sigev_value is passed to the sig->sigev_notify_function as described in sigevent(3).

The order in which the requests are carried out is not specified; in particular, there is no guarantee that they will be executed in the order 0, 1, ..., nent-1.

If mode is LIO_WAIT, the lio_listio() function returns 0 if the operations completed successfully, otherwise -1.

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

The lio_listio() function will fail if:
[]
There are not enough resources to enqueue the requests.
[]
The request would cause the system-wide limit {AIO_MAX} to be exceeded.
[]
The mode argument is neither LIO_WAIT nor LIO_NOWAIT, or nent is greater than {AIO_LISTIO_MAX}.
[]
The asynchronous notification method in sig->sigev_notify is invalid or not supported.
[]
A signal interrupted the system call before it could be completed.
[]
One or more requests failed.

In addition, the lio_listio() function may fail for any of the reasons listed for aio_read(2) and aio_write(2).

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(2).

aio_error(2), aio_read(2), aio_write(2), read(2), write(2), sigevent(3), siginfo(3), aio(4)

The lio_listio() function is expected to conform to IEEE Std 1003.1-2001 (“POSIX.1”).

The lio_listio() system call first appeared in FreeBSD 3.0.
December 7, 2019 FreeBSD 13.1-RELEASE

Search for    or go to Top of page |  Section 2 |  Main Index

Powered by GSP Visit the GSP FreeBSD Man Page Interface.
Output converted with ManDoc.