NetBSD/lib/libc/net/sockatmark.3

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.\" $NetBSD: sockatmark.3,v 1.4 2002/02/07 07:00:22 ross Exp $
.\"
.\" Copyright (c) 2001 The NetBSD Foundation, Inc.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Klaus Klein.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\" 3. All advertising materials mentioning features or use of this software
.\" must display the following acknowledgement:
.\" This product includes software developed by the NetBSD
.\" Foundation, Inc. and its contributors.
.\" 4. Neither the name of The NetBSD Foundation nor the names of its
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.Dd October 22, 2001
.Dt SOCKATMARK 3
.Os
.Sh NAME
.Nm sockatmark
.Nd determine whether a socket is at the out-of-band mark
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.Fd #include \*[Lt]sys/socket.h\*[Gt]
.Ft int
.Fn sockatmark "int s"
.Sh DESCRIPTION
The
.Nm sockatmark
function determines whether the socket referenced by the file descriptor
.Fa s
is at the out-of-band mark.
.Sh RETURN VALUES
If successful, the
.Nm sockatmark
function returns 1 to indicate that the socket is at an out-of-band mark;
0 is returned if there is no out-of-band mark or the mark is preceeded
by in-band data.
Otherwise, -1 is returned and
.Va errno
is set to indicate the error.
.Sh ERRORS
The
.Nm sockatmark
function will fail if:
.Bl -tag -width Er
.It Bq Er EBADF
The argument
.Fa s
is not a valid file descriptor.
.It Bq Er ENOTTY
The file desciptor
.Fa s
does not refer to a socket.
.El
.Sh SEE ALSO
.Xr ioctl 2 ,
.Xr recv 2 ,
.Xr socket 2
.Rs
.%T "BSD Interprocess Communication Tutorial"
.%O "reprinted in UNIX Programmer's Supplementary Documents Volume 1"
.Re
.Rs
.%T "Advanced 4.4BSD IPC Tutorial"
.%O "reprinted in UNIX Programmer's Supplementary Documents Volume 1"
.Re
.Sh STANDARDS
The
.Nm sockatmark
function conforms to
.St -p1003.1g-2000 .
.\" XXX add POSIX-1:200x reference when finalized
.Sh HISTORY
The
.Nm sockatmark
function appeared in
.St -p1003.1g-2000
as a replacement for the
.Dv SIOCATMARK
.Xr ioctl 2
interface.