io_submit(2)

1IO_SUBMIT(2)               Linux Programmer's Manual              IO_SUBMIT(2)
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NAME

6       io_submit - submit asynchronous I/O blocks for processing
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SYNOPSIS

9       #include <linux/aio_abi.h>          /* Defines needed types */
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11       int io_submit(aio_context_t ctx_id, long nr, struct iocb **iocbpp);
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13       Note: There is no glibc wrapper for this system call; see NOTES.
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DESCRIPTION

16       The io_submit() system call queues nr I/O request blocks for processing
17       in the AIO context ctx_id.  The iocbpp argument should be an  array  of
18       nr AIO control blocks, which will be submitted to context ctx_id.
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RETURN VALUE

21       On  success,  io_submit()  returns the number of iocbs submitted (which
22       may be 0 if nr is zero).  For the failure return, see NOTES.
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ERRORS

25       EAGAIN Insufficient resources are available to queue any iocbs.
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27       EBADF  The file descriptor specified in the first iocb is invalid.
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29       EFAULT One of the data structures points to invalid data.
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31       EINVAL The AIO context specified by ctx_id is invalid.  nr is less than
32              0.   The  iocb at *iocbpp[0] is not properly initialized, or the
33              operation specified is invalid for the file  descriptor  in  the
34              iocb.
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36       ENOSYS io_submit() is not implemented on this architecture.
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VERSIONS

39       The asynchronous I/O system calls first appeared in Linux 2.5.
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CONFORMING TO

42       io_submit()  is  Linux-specific and should not be used in programs that
43       are intended to be portable.
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NOTES

46       Glibc does not provide a wrapper function for this  system  call.   You
47       could  invoke  it  using syscall(2).  But instead, you probably want to
48       use the io_submit() wrapper function provided by libaio.
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50       Note that the libaio wrapper function uses a  different  type  (io_con‐
51       text_t)  for  the  ctx_id  argument.  Note also that the libaio wrapper
52       does not follow the usual C library conventions for indicating  errors:
53       on  error it returns a negated error number (the negative of one of the
54       values  listed  in  ERRORS).   If  the  system  call  is  invoked   via
55       syscall(2),  then  the  return  value follows the usual conventions for
56       indicating an error: -1, with errno set  to  a  (positive)  value  that
57       indicates the error.
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COLOPHON

63       This  page  is  part of release 3.53 of the Linux man-pages project.  A
64       description of the project, and information about reporting  bugs,  can
65       be found at http://www.kernel.org/doc/man-pages/.
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69Linux                             2012-07-13                      IO_SUBMIT(2)