[Solved] Permission problem, programming advice needed, Perl

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LEARN ABOUT DEBIAN

io_setup

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

NAME

       io_setup - create an asynchronous I/O context

SYNOPSIS

       #include <linux/aio_abi.h>	   /* Defines needed types */

       int io_setup(unsigned nr_events, aio_context_t *ctx_idp);

       Note: There is no glibc wrapper for this system call; see NOTES.

DESCRIPTION

       The  io_setup()	system	call  creates  an asynchronous I/O context capable of receiving at least nr_events.  The ctx_idp argument must not
       point to an AIO context that already exists, and must be initialized to 0 prior to the call.  On successful creation of	the  AIO  context,
       *ctx_idp is filled in with the resulting handle.

RETURN VALUE

       On success, io_setup() returns 0.  For the failure return, see NOTES.

ERRORS

       EAGAIN The specified nr_events exceeds the user's limit of available events.

       EFAULT An invalid pointer is passed for ctx_idp.

       EINVAL ctx_idp is not initialized, or the specified nr_events exceeds internal limits.  nr_events should be greater than 0.

       ENOMEM Insufficient kernel resources are available.

       ENOSYS io_setup() is not implemented on this architecture.

VERSIONS

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

CONFORMING TO

       io_setup() 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_setup() wrapper function provided by libaio.

       Note that the libaio wrapper function uses a different type (io_context_t *) for the ctx_idp 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  indi-
       cating 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_submit(2), aio(7)

COLOPHON

       This  page is part of release 3.44 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_SETUP(2)

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