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PROLOG

       This  manual  page  is part of the POSIX Programmer's Manual.  The Linux implementation of
       this interface may differ (consult the corresponding Linux  manual  page  for  details  of
       Linux behavior), or the interface may not be implemented on Linux.

NAME

       aio.h — asynchronous input and output

SYNOPSIS

       #include <aio.h>

DESCRIPTION

       The  <aio.h>  header  shall  define  the aiocb structure, which shall include at least the
       following members:

           int             aio_fildes     File descriptor.
           off_t           aio_offset     File offset.
           volatile void  *aio_buf        Location of buffer.
           size_t          aio_nbytes     Length of transfer.
           int             aio_reqprio    Request priority offset.
           struct sigevent aio_sigevent   Signal number and value.
           int             aio_lio_opcode Operation to be performed.

       The <aio.h> header shall define the off_t, pthread_attr_t, size_t, and  ssize_t  types  as
       described in <sys/types.h>.

       The <aio.h> header shall define the struct timespec structure as described in <time.h>.

       The  <aio.h>  header  shall define the sigevent structure and sigval union as described in
       <signal.h>.

       The <aio.h> header shall define the following symbolic constants:

       AIO_ALLDONE   A return value indicating that none of the  requested  operations  could  be
                     canceled since they are already complete.

       AIO_CANCELED  A return value indicating that all requested operations have been canceled.

       AIO_NOTCANCELED
                     A return value indicating that some of the requested operations could not be
                     canceled since they are in progress.

       LIO_NOP       A lio_listio() element operation  option  indicating  that  no  transfer  is
                     requested.

       LIO_NOWAIT    A  lio_listio() synchronization operation indicating that the calling thread
                     is  to  continue  execution  while  the  lio_listio()  operation  is   being
                     performed, and no notification is given when the operation is complete.

       LIO_READ      A lio_listio() element operation option requesting a read.

       LIO_WAIT      A  lio_listio() synchronization operation indicating that the calling thread
                     is to suspend until the lio_listio() operation is complete.

       LIO_WRITE     A lio_listio() element operation option requesting a write.

       The following shall be declared as functions and may also be defined as  macros.  Function
       prototypes shall be provided.

           int      aio_cancel(int, struct aiocb *);
           int      aio_error(const struct aiocb *);
           int      aio_fsync(int, struct aiocb *);
           int      aio_read(struct aiocb *);
           ssize_t  aio_return(struct aiocb *);
           int      aio_suspend(const struct aiocb *const [], int,
                        const struct timespec *);
           int      aio_write(struct aiocb *);
           int      lio_listio(int, struct aiocb *restrict const [restrict], int,
                        struct sigevent *restrict);

       Inclusion of the <aio.h> header may make visible symbols defined in the headers <fcntl.h>,
       <signal.h>, and <time.h>.

       The following sections are informative.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       <fcntl.h>, <signal.h>, <sys_types.h>, <time.h>

       The System Interfaces volume  of  POSIX.1‐2017,  aio_cancel(),  aio_error(),  aio_fsync(),
       aio_read(),  aio_return(),  aio_suspend(),  aio_write(),  fsync(),  lio_listio(), lseek(),
       read(), write()

COPYRIGHT

       Portions of this text are reprinted and  reproduced  in  electronic  form  from  IEEE  Std
       1003.1-2017,  Standard  for  Information Technology -- Portable Operating System Interface
       (POSIX), The Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C)  2018  by
       the  Institute  of  Electrical  and Electronics Engineers, Inc and The Open Group.  In the
       event of any discrepancy between this version and the original IEEE  and  The  Open  Group
       Standard,  the  original  IEEE  and  The  Open Group Standard is the referee document. The
       original Standard can be obtained online at http://www.opengroup.org/unix/online.html .

       Any typographical or formatting errors that appear in this page are most  likely  to  have
       been  introduced  during  the conversion of the source files to man page format. To report
       such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .