This manual page is part of the POSIX Programmer's Manual. The Linux
implementation of this interface may differ (consult the
corresponding Linux manual page for details of Linux behavior), or
the interface may not be implemented on Linux.
The aio_suspend() function shall suspend the calling thread until at
least one of the asynchronous I/O operations referenced by the list
argument has completed, until a signal interrupts the function, or,
if timeout is not NULL, until the time interval specified by timeout
has passed. If any of the aiocb structures in the list correspond to
completed asynchronous I/O operations (that is, the error status for
the operation is not equal to [EINPROGRESS]) at the time of the call,
the function shall return without suspending the calling thread. The
list argument is an array of pointers to asynchronous I/O control
blocks. The nent argument indicates the number of elements in the
array. Each aiocb structure pointed to has been used in initiating an
asynchronous I/O request via aio_read(), aio_write(), or
lio_listio(). This array may contain null pointers, which are
ignored. If this array contains pointers that refer to aiocb
structures that have not been used in submitting asynchronous I/O,
the effect is undefined.
If the time interval indicated in the timespec structure pointed to
by timeout passes before any of the I/O operations referenced by list
are completed, then aio_suspend() shall return with an error. If the
Monotonic Clock option is supported, the clock that shall be used to
measure this time interval shall be the CLOCK_MONOTONIC clock.
If the aio_suspend() function returns after one or more asynchronous
I/O operations have completed, the function shall return zero.
Otherwise, the function shall return a value of −1 and set errno to
indicate the error.
The application may determine which asynchronous I/O completed by
scanning the associated error and return status using aio_error() and
The aio_suspend() function shall fail if:
EAGAIN No asynchronous I/O indicated in the list referenced by list
completed in the time interval indicated by timeout.
EINTR A signal interrupted the aio_suspend() function. Note that,
since each asynchronous I/O operation may possibly provoke a
signal when it completes, this error return may be caused by
the completion of one (or more) of the very I/O operations
The following sections are informative.
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2013 Edition, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The Open
Group Base Specifications Issue 7, Copyright (C) 2013 by the
Institute of Electrical and Electronics Engineers, Inc and The Open
Group. (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1
applied.) In the event of any discrepancy between this version and
the original IEEE and The Open Group Standard, the original IEEE and
The Open Group Standard is the referee document. The original
Standard can be obtained online at http://www.unix.org/online.html .
Any typographical or formatting errors that appear in this page are
most likely to have been introduced during the conversion of the
source files to man page format. To report such errors, see
IEEE/The Open Group 2013 AIO_SUSPEND(3P)