AIO_CANCEL(2) BSD System Calls Manual AIO_CANCEL(2)NAMEaio_cancel — cancel an outstanding asynchronous I/O operation (REALTIME)
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <aio.h>
int
aio_cancel(int fildes, struct aiocb * iocb);
DESCRIPTION
The aio_cancel() function cancels the outstanding asynchronous I/O
request for the file descriptor specified in fildes. If iocb is speci‐
fied, only that specific asynchronous I/O request is cancelled.
Normal asynchronous notification occurs for cancelled requests. Requests
complete with an error result of ECANCELED.
RESTRICTIONS
The aio_cancel() function does not cancel asynchronous I/O requests for
raw disk devices. The aio_cancel() function will always return
AIO_NOTCANCELED for file descriptors associated with raw disk devices.
RETURN VALUES
The aio_cancel() function returns -1 to indicate an error, or one of the
following:
[AIO_CANCELED]
All outstanding requests meeting the criteria specified
were cancelled.
[AIO_NOTCANCELED]
Some requests were not cancelled, status for the requests
should be checked with aio_error(2).
[AIO_ALLDONE]
All of the requests meeting the criteria have finished.
ERRORS
An error return from aio_cancel() indicates:
[EBADF] fildes is an invalid file descriptor.
SEE ALSOaio_error(2), aio_read(2), aio_return(2), aio_suspend(2), aio_write(2)STANDARDS
The aio_cancel() function is expected to conform to the IEEE Std 1003.2
(“POSIX.2”) standard.
HISTORY
The aio_cancel() function first appeared in FreeBSD 3.0. The first func‐
tional implementation of aio_cancel() appeared in FreeBSD 4.0.
AUTHORS
This manual page was originally written by Wes Peters ⟨wes@softweyr.com⟩.
Christopher M Sedore ⟨cmsedore@maxwell.syr.edu⟩ updated it when
aio_cancel() was implemented for FreeBSD 4.0.
BSD January 19, 2000 BSD
