io_setup — create an asynchronous I/O context
#include <linux/aio_abi.h> /* Defines needed types */
int
io_setup( |
unsigned nr_events, |
aio_context_t *ctx_idp); |
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Note |
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| There is no glibc wrapper for this system call; see NOTES. |
The io_setup() system call
creates an asynchronous I/O context capable of receiving at
least nr_events. The
ctx_idp argument must
not point to an AIO context that already exists, and must be
initialized to 0 prior to the call. On successful creation of
the AIO context, *ctx_idp is filled in with the
resulting handle.
The specified nr_events exceeds the
user's limit of available events.
An invalid pointer is passed for ctx_idp.
ctx_idp is
not initialized, or the specified nr_events exceeds
internal limits. nr_events should be
greater than 0.
Insufficient kernel resources are available.
io_setup() is not
implemented on this architecture.
io_setup() is Linux-specific
and should not be used in programs that are intended to be
portable.
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_setup() wrapper function provided by
libaio.
Note that the libaio wrapper function uses
a different type (io_context_t
*) for the ctx_idp 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 indicating an error:
−1, with errno set to a
(positive) value that indicates the error.
This page is part of release 3.50 of the Linux man-pages project. A
description of the project, and information about reporting
bugs, can be found at
http://www.kernel.org/doc/man-pages/.
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Copyright (C) 2003 Free Software Foundation, Inc. %%%LICENSE_START(GPL_NOVERSION_ONELINE) This file is distributed according to the GNU General Public License. %%%LICENSE_END |