.\" Copyright (C) 2003 Free Software Foundation, Inc.
+.\"
+.\" %%%LICENSE_START(GPL_NOVERSION_ONELINE)
.\" This file is distributed according to the GNU General Public License.
-.\" See the file COPYING in the top level source directory for details.
+.\" %%%LICENSE_END
.\"
-.\" .de Sh \" Subsection
-.\" .br
-.\" .if t .Sp
-.\" .ne 5
-.\" .PP
-.\" \fB\\$1\fP
-.\" .PP
-.\" ..
-.\" .de Sp \" Vertical space (when we can't use .PP)
-.\" .if t .sp .5v
-.\" .if n .sp
-.\" ..
-.\" .de Ip \" List item
-.\" .br
-.\" .ie \\n(.$>=3 .ne \\$3
-.\" .el .ne 3
-.\" .IP "\\$1" \\$2
-.\" ..
-.TH IO_SUBMIT 2 2008-06-18 "Linux" "Linux Programmer's Manual"
+.TH IO_SUBMIT 2 2012-07-13 "Linux" "Linux Programmer's Manual"
.SH NAME
io_submit \- submit asynchronous I/O blocks for processing
-.SH "SYNOPSIS"
+.SH SYNOPSIS
.nf
-.\" .ad l
-.\" .hy 0
-.B #include <libaio.h>
-.\" #include <linux/aio.h>
-.sp
-.\" .HP 16
+.BR "#include <linux/aio_abi.h>" " /* Defines needed types */"
+
.BI "int io_submit(aio_context_t " ctx_id ", long " nr \
", struct iocb **" iocbpp );
-.\" .ad
-.\" .hy
-.sp
-Link with \fI\-laio\fP.
.fi
-.SH "DESCRIPTION"
+
+.IR Note :
+There is no glibc wrapper for this system call; see NOTES.
+.SH DESCRIPTION
.PP
+The
.BR io_submit ()
+system call
queues \fInr\fP I/O request blocks for processing in
the AIO context \fIctx_id\fP.
-\fIiocbpp\fP should be an array of \fInr\fP AIO control blocks,
+The
+.I iocbpp
+argument should be an array of \fInr\fP AIO control blocks,
which will be submitted to context \fIctx_id\fP.
-.SH "RETURN VALUE"
+.SH RETURN VALUE
On success,
.BR io_submit ()
returns the number of \fIiocb\fPs submitted (which may be
0 if \fInr\fP is zero).
For the failure return, see NOTES.
-.SH "ERRORS"
+.SH ERRORS
.TP
.B EAGAIN
Insufficient resources are available to queue any \fIiocb\fPs.
One of the data structures points to invalid data.
.TP
.B EINVAL
-The \fIaio_context\fP specified by \fIctx_id\fP is invalid.
+The AIO context specified by \fIctx_id\fP is invalid.
\fInr\fP is less than 0.
-The \fIiocb\fP at *iocbpp[0] is not properly initialized,
+The \fIiocb\fP at
+.I *iocbpp[0]
+is not properly initialized,
or the operation specified is invalid for the file descriptor
in the \fIiocb\fP.
.TP
.B ENOSYS
.BR io_submit ()
is not implemented on this architecture.
-.SH "VERSIONS"
+.SH VERSIONS
.PP
-The asynchronous I/O system calls first appeared in Linux 2.5, August 2002.
-.SH "CONFORMING TO"
+The asynchronous I/O system calls first appeared in Linux 2.5.
+.SH CONFORMING TO
.PP
.BR io_submit ()
is Linux-specific and should not be used in
programs that are intended to be portable.
.SH NOTES
Glibc does not provide a wrapper function for this system call.
+You could invoke it using
+.BR syscall (2).
+But instead, you probably want to use the
+.BR io_submit ()
+wrapper function provided by
+.\" http://git.fedorahosted.org/git/?p=libaio.git
+.IR libaio .
-The wrapper provided in
+Note that the
.I libaio
-for
-.BR io_submit ()
-does not follow the usual C library conventions for indicating error:
+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
indicating an error: \-1, with
.I errno
set to a (positive) value that indicates the error.
-.SH "SEE ALSO"
+.SH SEE ALSO
.BR io_cancel (2),
.BR io_destroy (2),
.BR io_getevents (2),
-.BR io_setup (2)
-.\" .SH "NOTES"
-.\" .PP
-.\" The asynchronous I/O system calls were written by Benjamin LaHaise.
+.BR io_setup (2),
+.BR aio (7)
.\" .SH AUTHOR
.\" Kent Yoder.
+.SH COLOPHON
+This page is part of release 3.79 of the Linux
+.I man-pages
+project.
+A description of the project,
+information about reporting bugs,
+and the latest version of this page,
+can be found at
+\%http://www.kernel.org/doc/man\-pages/.
OSDN Git Service
