1 .\" Copyright (C) 2003 Free Software Foundation, Inc.
3 .\" %%%LICENSE_START(GPL_NOVERSION_ONELINE)
4 .\" This file is distributed according to the GNU General Public License.
7 .TH IO_SETUP 2 2012-07-13 "Linux" "Linux Programmer's Manual"
9 io_setup \- create an asynchronous I/O context
12 .BR "#include <linux/aio_abi.h>" " /* Defines needed types */"
14 .BI "int io_setup(unsigned " nr_events ", aio_context_t *" ctx_idp );
18 There is no glibc wrapper for this system call; see NOTES.
24 creates an asynchronous I/O context capable of receiving
25 at least \fInr_events\fP.
28 argument must not point to an AIO context that already exists, and must
29 be initialized to 0 prior to the call.
30 On successful creation of the AIO context, \fI*ctx_idp\fP is filled in
31 with the resulting handle.
36 For the failure return, see NOTES.
40 The specified \fInr_events\fP exceeds the user's limit of available events.
43 An invalid pointer is passed for \fIctx_idp\fP.
46 \fIctx_idp\fP is not initialized, or the specified \fInr_events\fP
47 exceeds internal limits.
48 \fInr_events\fP should be greater than 0.
51 Insufficient kernel resources are available.
55 is not implemented on this architecture.
58 The asynchronous I/O system calls first appeared in Linux 2.5.
62 is Linux-specific and should not be used in programs
63 that are intended to be portable.
65 Glibc does not provide a wrapper function for this system call.
66 You could invoke it using
68 But instead, you probably want to use the
70 wrapper function provided by
71 .\" http://git.fedorahosted.org/git/?p=libaio.git
76 wrapper function uses a different type
77 .RI ( "io_context_t\ *" )
78 .\" But glibc is confused, since <libaio.h> uses 'io_context_t' to declare
85 wrapper does not follow the usual C library conventions for indicating errors:
86 on error it returns a negated error number
87 (the negative of one of the values listed in ERRORS).
88 If the system call is invoked via
90 then the return value follows the usual conventions for
91 indicating an error: \-1, with
93 set to a (positive) value that indicates the error.