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@c

@c  COPYRIGHT (c) 1988-2002.

@c  On-Line Applications Research Corporation (OAR).

@c  All rights reserved.

@c

@c  ch06.t,v 1.14 2002/01/17 21:47:45 joel Exp

@c

@chapter Input and Output Primitives

@section Pipes

@subsection Create an Inter-Process Channel

@example

pipe(), Function, Dummy Implementation

@end example

NOTE: pipe() returns ENOSYS.

@section File Descriptor Manipulation

@subsection Duplicate an Open File Descriptor

@example

dup(), Function, Implemented

dup2(), Function, Implemented

@end example

@section File Descriptor Deassignment

@subsection Close a File

@example

close(), Function, Implemented

@end example

@section Input and Output

@subsection Read from a File

@example

read(), Function, Implemented

@end example

@subsection Write to a File

@example

write(), Function, Implemented

@end example

@section Control Operations on Files

@subsection Data Definitions for File Control Operations

@subsection File Control

@example

struct flock, Type, Implemented

fcntl(), Function, Implemented

F_DUPFD, Constant, Implemented

F_GETFD, Constant, Implemented

F_GETLK, Constant, Implemented

F_SETFD, Constant, Implemented

F_GETFL, Constant, Implemented

F_SETFL, Constant, Implemented

F_SETLK, Constant, Implemented

F_SETLKW, Constant, Implemented

FD_CLOEXEC, Constant, Implemented

F_RDLCK, Constant, Implemented

F_UNLCK, Constant, Implemented

F_WRLCK, Constant, Implemented

O_ACCMODE, Constant, Implemented

@end example

NOTE: A number of constants are used by both @code{open} and @code{fcntl}.

@code{O_CREAT}, @code{O_EXCL}, @code{O_NOCTTY}, @code{O_TRUNC},

@code{O_APPEND}, @code{O_DSYNC}, @code{O_NONBLOCK}, @code{O_RSYNC},

@code{O_SYNC}, @code{O_RDONLY}, @code{O_RDWR}, and @code{O_WRONLY}

are also included in another section.  @xref{Open a File}.

@subsection Reposition Read/Write File Offset

@example

lseek(), Function, Implemented

SEEK_SET, Constant, Implemented

SEEK_CUR, Constant, Implemented

SEEK_END, Constant, Implemented

@end example

@section File Synchronization

@subsection Synchronize the State of a File

@example

fsync(), Function, Implemented

@end example

@subsection Synchronize the Data of a File

@example

fdatasync(), Function, Implemented

@end example

@section Asynchronous Input and Output

@subsection Data Definitions for Asynchronous Input and Output

@subsubsection Asynchronous I/O Control Block

@example

struct aiocb, Type, Untested Implementation

@end example

@subsubsection Asynchronous I/O Manifest Constants

@example

AIO_CANCELED, Constant, Implemented

AIO_NOTCANCELED, Constant, Implemented

AIO_ALLDONE, Constant, Implemented

LIO_WAIT, Constant, Implemented

LIO_NOWAIT, Constant, Implemented

LIO_READ, Constant, Implemented

LIO_WRITE, Constant, Implemented

LIO_NOP, Constant, Implemented

@end example

@subsection Asynchronous Read

@example

aio_read(), Function, Dummy Implementation

@end example

@subsection Asynchronous Write

@example

aio_write(), Function, Dummy Implementation

@end example

@subsection List Directed I/O

@example

lio_listio(), Function, Dummy Implementation

@end example

@subsection Retrieve Error Status of Asynchronous I/O Operation

@example

aio_error(), Function, Dummy Implementation

@end example

@subsection Retrieve Return Status of Asynchronous I/O Operation

@example

aio_return(), Function, Dummy Implementation

@end example

@subsection Cancel Asynchronous I/O Request

@example

aio_cancel(), Function, Dummy Implementation

@end example

@subsection Wait for Asynchronous I/O Request

@example

aio_suspend(), Function, Dummy Implementation

@end example

@subsection Asynchronous File Synchronization

@example

aio_fsync(), Function, Dummy Implementation

@end example