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PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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AIO_CANCEL(3P) POSIX Programmer's Manual AIO_CANCEL(3P)
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.
aio_cancel — cancel an asynchronous I/O request
#include <aio.h>
int aio_cancel(int fildes, struct aiocb *aiocbp);
The aio_cancel() function shall attempt to cancel one or more
asynchronous I/O requests currently outstanding against file
descriptor fildes. The aiocbp argument points to the asynchronous
I/O control block for a particular request to be canceled. If
aiocbp is NULL, then all outstanding cancelable asynchronous I/O
requests against fildes shall be canceled.
Normal asynchronous notification shall occur for asynchronous I/O
operations that are successfully canceled. If there are requests
that cannot be canceled, then the normal asynchronous completion
process shall take place for those requests when they are
completed.
For requested operations that are successfully canceled, the
associated error status shall be set to [ECANCELED] and the return
status shall be -1. For requested operations that are not
successfully canceled, the aiocbp shall not be modified by
aio_cancel().
If aiocbp is not NULL, then if fildes does not have the same value
as the file descriptor with which the asynchronous operation was
initiated, unspecified results occur.
Which operations are cancelable is implementation-defined.
The aio_cancel() function shall return the value AIO_CANCELED if
the requested operation(s) were canceled. The value
AIO_NOTCANCELED shall be returned if at least one of the requested
operation(s) cannot be canceled because it is in progress. In this
case, the state of the other operations, if any, referenced in the
call to aio_cancel() is not indicated by the return value of
aio_cancel(). The application may determine the state of affairs
for these operations by using aio_error(). The value AIO_ALLDONE
is returned if all of the operations have already completed.
Otherwise, the function shall return -1 and set errno to indicate
the error.
The aio_cancel() function shall fail if:
EBADF The fildes argument is not a valid file descriptor.
The following sections are informative.
None.
None.
None.
None.
aio_read(3p), aio_write(3p)
The Base Definitions volume of POSIX.1‐2017, aio.h(0p)
Portions of this text are reprinted and reproduced in electronic
form from IEEE Std 1003.1-2017, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The
Open Group Base Specifications Issue 7, 2018 Edition, Copyright
(C) 2018 by the Institute of Electrical and Electronics Engineers,
Inc and The Open Group. 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.opengroup.org/unix/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
https://www.kernel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2017 AIO_CANCEL(3P)
Pages that refer to this page: aio.h(0p), aio_error(3p), aio_read(3p), aio_return(3p), aio_write(3p), lio_listio(3p)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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