AIO_WRITE(3)		   Linux Programmers Manual		 AIO_WRITE(3)



NAME
       aio_write - asynchronous write

SYNOPSIS
       #include 

       int aio_write(struct aiocb *aiocbp);

       Link with -lrt.

DESCRIPTION
       The  aio_write()  function requests an asynchronous "n = write(fd, buf,
       count)"	 with	fd,   buf,   count   given   by    aiocbp->aio_fildes,
       aiocbp->aio_buf, aiocbp->aio_nbytes, respectively.  The return status n
       can be retrieved upon completion using aio_return(3).

       If O_APPEND is not set, the data is written starting  at  the  absolute
       file  offset  aiocbp->aio_offset,  regardless of the current file posi
       tion.  If O_APPEND is set, the data is written at the end of the  file.
       After  this request, the value of the current file position is unspeci
       fied.

       The "asynchronous" means that this call returns as soon as the  request
       has  been  enqueued;  the  write may or may not have completed when the
       call returns.  One tests for completion using aio_error(3).

       If _POSIX_PRIORITIZED_IO is defined, and this file  supports  it,  then
       the  asynchronous operation is submitted at a priority equal to that of
       the calling process minus aiocbp->aio_reqprio.

       The field aiocbp->aio_lio_opcode is ignored.

       No data is written to a regular file beyond its maximum offset.

RETURN VALUE
       On success, 0 is returned.  On error the request is not enqueued, -1 is
       returned,  and  errno  is  set  appropriately.	If  an	error is first
       detected later, it will be reported via aio_return(3)  (returns	status
       -1)  and  aio_error(3)  (error status whatever one would have gotten in
       errno, such as EBADF).

ERRORS
       EAGAIN Out of resources.

       EBADF  aio_fildes is not a valid file descriptor open for writing.

       EFBIG  The file is a regular file, we want to write at least one  byte,
	      but the starting position is at or beyond the maximum offset for
	      this file.

       EINVAL One or more of aio_offset, aio_reqprio, aio_nbytes are  invalid.

       ENOSYS This function is not supported.

CONFORMING TO
       POSIX.1-2001.

NOTES
       It  is a good idea to zero out the control block before use.  This con
       trol block must	not  be  changed  while  the  write  operation	is  in
       progress.   The buffer area being written out must not be accessed dur
       ing the operation or undefined results may  occur.   The  memory  areas
       involved must remain valid.

SEE ALSO
       aio_cancel(3),  aio_error(3), aio_fsync(3), aio_read(3), aio_return(3),
       aio_suspend(3)

COLOPHON
       This page is part of release 3.05 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/.



				  2003-11-14			  AIO_WRITE(3)