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.\" $FreeBSD: release/9.1.0/share/man/man4/man4.i386/streams.4 177443 2008-03-20 08:46:27Z brueffer $
.\"
.Dd March 17, 2008
.Dt STREAMS 4 i386
.Os
.Sh NAME
.Nm streams
.Nd System V STREAMS networking ABI support
.Sh SYNOPSIS
To compile support for this ABI into the kernel,
place the following line in your
kernel configuration file:
.Bd -ragged -offset indent
.Cd "device streams"
.Ed
.Pp
Alternatively, to load the ABI as a
module at boot time, place the following line in
.Xr loader.conf 5 :
.Bd -literal -offset indent
streams_load="YES"
.Ed
.Sh DESCRIPTION
The
.Nm
module provides limited
System V Release 4 STREAMS interprocess communication ABI
(application binary interface) compatibility
for userland applications.
.Pp
Internally,
.Nm
provides STREAMS handles by using socket creation kernel routines, and
adding state-tracking information to the socket to permit manipulation
by STREAMS emulation code in
.Xr svr4 4 .
Hence, opening a stream device produces a result similar to what would be
obtained by calling
.Xr socket 2 .
.Pp
Applications should never use this interface directly: STREAMS
emulation is only provided as a service to support ABI requirements in
the SVR4 environment which
.Xr svr4 4
needs to present to client binaries.
.Sh SEE ALSO
.Xr svr4 4
.Sh HISTORY
System V Release 4 ABI support first appeared in
.Fx 4.0 .
The ABI was ported from an equivalent facility present in
.Nx 1.3
written by Christos Zoulas.
.Sh BUGS
This whole interface is a crude hack to produce STREAMS semantics
through emulation over sockets.
.Pp
Programmers who hope to be able to use this interface to provide
SVR4 STREAMS services to
.Bx
applications will be sorely disappointed.