aio_read man page on Manjaro

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

       aio_read - asynchronous read

       #include <aio.h>

       int aio_read(struct aiocb *aiocbp);

       Link with -lrt.

       The  aio_read() function queues the I/O request described by the buffer
       pointed to by aiocbp.  This function  is	 the  asynchronous  analog  of
       read(2).	 The arguments of the call

	   read(fd, buf, count)

       correspond (in order) to the fields aio_fildes, aio_buf, and aio_nbytes
       of the structure pointed to by aiocbp.  (See aio(7) for	a  description
       of the aiocb structure.)

       The  data is read starting at the absolute file offset aiocbp->aio_off‐
       set, regardless of the current file offset.  After the call, the	 value
       of the current file offset is unspecified.

       The  "asynchronous" means that this call returns as soon as the request
       has been enqueued; the read may or may not have completed when the call
       returns.	 One tests for completion using aio_error(3).  The return sta‐
       tus of a completed I/O operation	 can  be  obtained  by	aio_return(3).
       Asynchronous  notification of I/O completion can be obtained by setting
       aiocbp->aio_sigevent appropriately; see sigevent(7) for details.

       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 read from 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 detected
       only 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 reading.

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

       ENOSYS aio_read() is not implemented.

	      The  file is a regular file, we start reading before end-of-file
	      and want at least one byte, but the starting  position  is  past
	      the maximum offset for this file.

       The aio_read() function is available since glibc 2.1.

       POSIX.1-2001, POSIX.1-2008.

       It  is  a good idea to zero out the control block before use.  The con‐
       trol block must not be changed while the read operation is in progress.
       The  buffer area being read into must not be accessed during the opera‐
       tion or undefined results may occur.  The memory	 areas	involved  must
       remain valid.

       Simultaneous I/O operations specifying the same aiocb structure produce
       undefined results.

       See aio(7).

       aio_cancel(3),  aio_error(3),  aio_fsync(3),  aio_return(3),   aio_sus‐
       pend(3), aio_write(3), lio_listio(3), aio(7)

       This  page  is  part of release 3.65 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at

				  2012-05-08			   AIO_READ(3)

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