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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "<aio.h>" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" <aio.h> 
+.SH NAME
+aio.h \- asynchronous input and output (\fBREALTIME\fP)
+.SH SYNOPSIS
+.LP
+\fB#include <aio.h> \fP
+.SH DESCRIPTION
+.LP
+The \fI<aio.h>\fP header shall define the \fBaiocb\fP structure which
+shall include at least the following members:
+.sp
+.RS
+.nf
+
+\fBint             aio_fildes    \fP File descriptor. \fB
+off_t           aio_offset    \fP File offset. \fB
+volatile void  *aio_buf       \fP Location of buffer. \fB
+size_t          aio_nbytes    \fP Length of transfer. \fB
+int             aio_reqprio   \fP Request priority offset. \fB
+struct sigevent aio_sigevent  \fP Signal number and value. \fB
+int             aio_lio_opcode\fP Operation to be performed. \fB
+\fP
+.fi
+.RE
+.LP
+This header shall also include the following constants:
+.TP 7
+AIO_ALLDONE
+A return value indicating that none of the requested operations could
+be canceled since they are already complete.
+.TP 7
+AIO_CANCELED
+A return value indicating that all requested operations have been
+canceled.
+.TP 7
+AIO_NOTCANCELED
+.sp
+A return value indicating that some of the requested operations could
+not be canceled since they are in progress.
+.TP 7
+LIO_NOP
+A \fIlio_listio\fP() element operation option indicating that no transfer
+is
+requested.
+.TP 7
+LIO_NOWAIT
+A \fIlio_listio\fP() synchronization operation indicating that the
+calling thread
+is to continue execution while the \fIlio_listio\fP() operation is
+being performed, and
+no notification is given when the operation is complete.
+.TP 7
+LIO_READ
+A \fIlio_listio\fP() element operation option requesting a read.
+.TP 7
+LIO_WAIT
+A \fIlio_listio\fP() synchronization operation indicating that the
+calling thread
+is to suspend until the \fIlio_listio\fP() operation is complete.
+.TP 7
+LIO_WRITE
+A \fIlio_listio\fP() element operation option requesting a write.
+.sp
+.LP
+The following shall be declared as functions and may also be defined
+as macros. Function prototypes shall be provided.
+.sp
+.RS
+.nf
+
+\fBint      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);
+\fP
+.fi
+.RE
+.LP
+Inclusion of the \fI<aio.h>\fP header may make visible symbols defined
+in the headers \fI<fcntl.h>\fP, \fI<signal.h>\fP, \fI<sys/types.h>\fP,
+and \fI<time.h>\fP.
+.LP
+\fIThe following sections are informative.\fP
+.SH APPLICATION USAGE
+.LP
+None.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fI<fcntl.h>\fP , \fI<signal.h>\fP , \fI<sys/types.h>\fP , \fI<time.h>\fP
+, the System Interfaces volume
+of IEEE\ Std\ 1003.1-2001, \fIfsync\fP(), \fIlseek\fP(), \fIread\fP(),
+\fIwrite\fP()
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 6, Copyright (C) 2001-2003 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 .