\" $NetBSD: sockatmark.3,v 1.10 2022/06/28 20:12:52 rillig Exp $

\" $NetBSD: sockatmark.3,v 1.10 2022/06/28 20:12:52 rillig Exp $
\"
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\" by Klaus Klein.
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Dd June 28, 2022
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
In sys/socket.h
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 preceded
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 descriptor
Fa s
does not refer to a socket.
El
Sh SEE ALSO
Xr ioctl 2 ,
Xr recv 2 ,
Xr socket 2
Rs
%T "An Introductory 4.4BSD Interprocess Communication Tutorial"
%A Stuart Sechrest
Re
Pq see Pa /usr/share/doc/reference/ref3/sockets
Rs
%T "Advanced 4.4BSD IPC Tutorial"
%A Samuel J. Leffler
%A Robert S. Fabry
%A William N. Joy
%A Phil Lapsley
%A Steve Miller
%A Chris Torek
Re
Pq see Pa /usr/share/doc/reference/ref3/sockets-advanced
Sh STANDARDS
The
Nm sockatmark
function conforms to
St -p1003.1-2001 .
Sh HISTORY
The
Nm sockatmark
function appeared in
St -p1003.1g-2000
as a replacement for the
Dv SIOCATMARK
Xr ioctl 2
interface.