IO_SUBMIT

Section: Linux Programmer's Manual (2)
Updated: 2008-06-18
Index Return to Main Contents

NAME

io_submit - submit asynchronous I/O blocks for processing

SYNOPSIS

#include <libaio.h>

int io_submit(aio_context_t ctx_id, long nr, struct iocb **iocbpp);

Link with -laio.

DESCRIPTION

io_submit() queues nr I/O request blocks for processing in the AIO context ctx_id. iocbpp 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, August 2002.

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.

The wrapper provided in libaio for io_submit() does not follow the usual C library conventions for indicating error: 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.

COLOPHON

This page is part of release 3.22 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/.