.\" Copyright (C) 2003 Free Software Foundation, Inc.
.\"
.\" SPDX-License-Identifier: GPL-1.0-or-later
.\"
.TH io_destroy 2 2023-03-30 "Linux man-pages 6.04"
.SH NAME
io_destroy \- destroy an asynchronous I/O context
.SH LIBRARY
Standard C library
.RI ( libc ", " \-lc )
.SH SYNOPSIS
.nf
.BR "#include <linux/aio_abi.h>" "    /* Definition of " aio_context_t " */"
.BR "#include <sys/syscall.h>" "      /* Definition of " SYS_* " constants */"
.B #include <unistd.h>
.PP
.BI "int syscall(SYS_io_destroy, aio_context_t " ctx_id );
.fi
.PP
.IR Note :
glibc provides no wrapper for
.BR io_destroy (),
necessitating the use of
.BR syscall (2).
.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_destroy ()
system call
will attempt to cancel all outstanding asynchronous I/O operations against
.IR ctx_id ,
will block on the completion of all operations
that could not be canceled, and will destroy the
.IR ctx_id .
.SH RETURN VALUE
On success,
.BR io_destroy ()
returns 0.
For the failure return, see VERSIONS.
.SH ERRORS
.TP
.B EFAULT
The context pointed to is invalid.
.TP
.B EINVAL
The AIO context specified by \fIctx_id\fP is invalid.
.TP
.B ENOSYS
.BR io_destroy ()
is not implemented on this architecture.
.SH VERSIONS
You probably want to use the
.BR io_destroy ()
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_cancel (2),
.BR io_getevents (2),
.BR io_setup (2),
.BR io_submit (2),
.BR aio (7)
.\" .SH AUTHOR
.\" Kent Yoder.