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IO_CANCEL(2)               Linux Programmer's Manual              IO_CANCEL(2)

NAME
       io_cancel - cancel an outstanding asynchronous I/O operation

SYNOPSIS
       #include <linux/aio_abi.h>          /* Defines needed types */

       int io_cancel(aio_context_t ctx_id, struct iocb *iocb,
                     struct io_event *result);

       Note: There is no glibc wrapper for this system call; see NOTES.

DESCRIPTION
       The  io_cancel() system call attempts to cancel an asynchronous I/O op-
       eration previously submitted with io_submit(2).  The iocb argument  de-
       scribes the operation to be canceled and the ctx_id argument is the AIO
       context to which the operation was submitted.  If the operation is suc-
       cessfully canceled, the event will be copied into the memory pointed to
       by result without being placed into the completion queue.

RETURN VALUE
       On success, io_cancel() returns 0.  For the failure return, see NOTES.

ERRORS
       EAGAIN The iocb specified was not canceled.

       EFAULT One of the data structures points to invalid data.

       EINVAL The AIO context specified by ctx_id is invalid.

       ENOSYS io_cancel() is not implemented on this architecture.

VERSIONS
       The asynchronous I/O system calls first appeared in Linux 2.5.

CONFORMING TO
       io_cancel() is Linux-specific and should not be used in  programs  that
       are intended to be portable.

NOTES
       Glibc  does  not  provide a wrapper function for this system call.  You
       could invoke it using syscall(2).  But instead, you  probably  want  to
       use the io_cancel() wrapper function provided by libaio.

       Note  that  the  libaio wrapper function uses a different type (io_con-
       text_t) for the ctx_id argument.  Note also  that  the  libaio  wrapper
       does  not follow the usual C library conventions for indicating errors:
       on error it returns a negated error number (the negative of one of  the
       values   listed  in  ERRORS).   If  the  system  call  is  invoked  via
       syscall(2), then the return value follows the usual conventions for in-
       dicating  an error: -1, with errno set to a (positive) value that indi-
       cates the error.

SEE ALSO
       io_destroy(2), io_getevents(2), io_setup(2), io_submit(2), aio(7)

COLOPHON
       This page is part of release 5.05 of the Linux  man-pages  project.   A
       description  of  the project, information about reporting bugs, and the
       latest    version    of    this    page,    can     be     found     at
       https://www.kernel.org/doc/man-pages/.

Linux                             2017-09-15                      IO_CANCEL(2)
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | VERSIONS | CONFORMING TO | NOTES | SEE ALSO | COLOPHON