IO_SUBMIT
Section: Linux Programmer's Manual (2)
Updated: 2012-07-13
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NAME
io_submit - submit asynchronous I/O blocks for processing
SYNOPSIS
#include <linux/aio_abi.h> /* Defines needed types */
int io_submit(aio_context_t ctx_id, long nr, struct iocb **iocbpp);
Note:
There is no glibc wrapper for this system call; see NOTES.
DESCRIPTION
The
io_submit()
system call
queues nr I/O request blocks for processing in
the AIO context ctx_id.
The
iocbpp
argument should be an array of nr AIO control blocks,
which will be submitted to context ctx_id.
RETURN VALUE
On success,
io_submit()
returns the number of iocbs submitted (which may be
0 if nr is zero).
For the failure return, see NOTES.
ERRORS
- EAGAIN
-
Insufficient resources are available to queue any iocbs.
- EBADF
-
The file descriptor specified in the first iocb is invalid.
- EFAULT
-
One of the data structures points to invalid data.
- EINVAL
-
The AIO context specified by ctx_id is invalid.
nr is less than 0.
The iocb at
*iocbpp[0]
is not properly initialized,
or the operation specified is invalid for the file descriptor
in the iocb.
- ENOSYS
-
io_submit()
is not implemented on this architecture.
VERSIONS
The asynchronous I/O system calls first appeared in Linux 2.5.
CONFORMING TO
io_submit()
is Linux-specific and should not be used in
programs that are intended to be portable.
NOTES
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_submit()
wrapper function provided by
libaio.
Note that the
libaio
wrapper function uses a different type
(io_context_t)
for the
ctx_id
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.
SEE ALSO
io_cancel(2),
io_destroy(2),
io_getevents(2),
io_setup(2),
aio(7)
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- VERSIONS
-
- CONFORMING TO
-
- NOTES
-
- SEE ALSO
-
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Time: 02:54:48 GMT, September 18, 2014