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FreeBSD 11.0 - man page for aio_cancel (freebsd section 2)

AIO_CANCEL(2)						      BSD 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> int aio_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 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() system call does not cancel asynchronous I/O requests for raw disk devices. The aio_cancel() system call will always return AIO_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.
BSD
January 19, 2000 BSD