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Provided by: freebsd-manpages_6.0-5_all

 

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.
      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
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.
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.
 

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