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AIO_WRITE(3)		   Linux Programmer's Manual		  AIO_WRITE(3)

       aio_write - asynchronous write

       #include <aio.h>

       int aio_write(struct aiocb *aiocbp);

       Link with -lrt.

       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‐

       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.

       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).

       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.


       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.

       aio_cancel(3), aio_error(3), aio_fsync(3), aio_read(3),	aio_return(3),

       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

				  2003-11-14			  AIO_WRITE(3)

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