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CentOS 7.0 - man page for io_submit (centos section 2)

IO_SUBMIT(2)						     Linux Programmer's Manual						      IO_SUBMIT(2)

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)
COLOPHON
This page is part of release 3.53 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/. Linux 2012-07-13 IO_SUBMIT(2)