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-.\" Copyright (C) 2003 Free Software Foundation, Inc.
-.\"
-.\" SPDX-License-Identifier: GPL-1.0-or-later
-.\"
-.TH io_cancel 2 (date) "Linux man-pages (unreleased)"
-.SH NAME
-io_cancel \- cancel an outstanding asynchronous I/O operation
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.PP
-Alternatively, Asynchronous I/O library
-.RI ( libaio ", " \-laio );
-see VERSIONS.
-.SH SYNOPSIS
-.nf
-.BR "#include <linux/aio_abi.h>" "    /* Definition of needed types */"
-.BR "#include <sys/syscall.h>" "      /* Definition of " SYS_* " constants */"
-.B #include <unistd.h>
-.PP
-.BI "int syscall(SYS_io_cancel, aio_context_t " ctx_id ", struct iocb *" iocb ,
-.BI "            struct io_event *" result );
-.fi
-.SH DESCRIPTION
-.IR Note :
-this page describes the raw Linux system call interface.
-The wrapper function provided by
-.I libaio
-uses a different type for the
-.I ctx_id
-argument.
-See VERSIONS.
-.PP
-The
-.BR io_cancel ()
-system call
-attempts to cancel an asynchronous I/O operation previously submitted with
-.BR io_submit (2).
-The
-.I iocb
-argument describes the operation to be canceled and the
-.I ctx_id
-argument is the AIO context to which the operation was submitted.
-If the operation is successfully canceled, the event will be copied into
-the memory pointed to by
-.I result
-without being placed into the
-completion queue.
-.SH RETURN VALUE
-On success,
-.BR io_cancel ()
-returns 0.
-For the failure return, see VERSIONS.
-.SH ERRORS
-.TP
-.B EAGAIN
-The \fIiocb\fP specified was not canceled.
-.TP
-.B EFAULT
-One of the data structures points to invalid data.
-.TP
-.B EINVAL
-The AIO context specified by \fIctx_id\fP is invalid.
-.TP
-.B ENOSYS
-.BR io_cancel ()
-is not implemented on this architecture.
-.SH VERSIONS
-You probably want to use the
-.BR io_cancel ()
-wrapper function provided by
-.\" http://git.fedorahosted.org/git/?p=libaio.git
-.IR libaio .
-.PP
-Note that the
-.I libaio
-wrapper function uses a different type
-.RI ( io_context_t )
-.\" But glibc is confused, since <libaio.h> uses 'io_context_t' to declare
-.\" the system call.
-for the
-.I ctx_id
-argument.
-Note also that the
-.I 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
-.BR syscall (2),
-then the return value follows the usual conventions for
-indicating an error: \-1, with
-.I errno
-set to a (positive) value that indicates the error.
-.SH STANDARDS
-Linux.
-.SH HISTORY
-Linux 2.5.
-.SH SEE ALSO
-.BR io_destroy (2),
-.BR io_getevents (2),
-.BR io_setup (2),
-.BR io_submit (2),
-.BR aio (7)
-.\" .SH AUTHOR
-.\" Kent Yoder.