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AIO_CANCEL(2) | System Calls Manual | AIO_CANCEL(2) |
NAME¶
aio_cancel — cancel an outstanding asynchronous I/O operation (REALTIME)LIBRARY¶
Standard C Library (libc, -lc)SYNOPSIS¶
#include <aio.h> intaio_cancel(int fildes, struct aiocb *iocb);
DESCRIPTION¶
The aio_cancel() system call cancels the outstanding asynchronous I/O request for the file descriptor specified in fildes. If iocb is specified, only that specific asynchronous I/O request is cancelled. Normal asynchronous notification occurs for cancelled requests. Requests complete with an error result ofECANCELED
.
RESTRICTIONS¶
The aio_cancel() system call does not cancel asynchronous I/O requests for raw disk devices. The aio_cancel() system call will always returnAIO_NOTCANCELED
for file
descriptors associated with raw disk devices.
RETURN VALUES¶
The aio_cancel() system call 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
] - The fildes argument is an invalid file descriptor.
SEE ALSO¶
aio_error(2), aio_read(2), aio_return(2), aio_suspend(2), aio_write(2), aio(4)STANDARDS¶
The aio_cancel() system call is expected to conform to the IEEE Std 1003.1 (“POSIX.1”) standard.HISTORY¶
The aio_cancel() system call first appeared in FreeBSD 3.0. The first functional 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.January 19, 2000 | Debian |