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.Dd October 29, 2017
.Dt SOCKIO 4I
.Os
.Sh NAME
.Nm sockio
.Nd ioctls that operate directly on sockets
.Sh SYNOPSIS
.In sys/sockio.h
.Sh DESCRIPTION
The
.Sy ioctl Ns s
listed in this manual page apply directly to sockets,
independent of any underlying protocol.
The
.Xr setsockopt 3SOCKET
call
.Po
see
.Xr getsockopt 3SOCKET
.Pc
is the primary method for operating on sockets,
rather than on the underlying protocol or network interface.
.Sy ioctl Ns s
for a specific network interface or protocol are documented in the manual page
for that interface or protocol.
.Bl -tag -width SIOCCATMARK
.It Dv SIOCSPGRP
The argument is a pointer to an
.Vt int .
Set the process-group
.Sy ID
that will subsequently receive
.Dv SIGIO
or
.Dv SIGURG
signals for the socket
referred to by the descriptor passed to
.Sy ioctl
to the value of that
.Vt int .
The argument must be either positive (in which case it must be a
process
.Sy ID )
or negative (in which case it must be a process group).
.It Dv SIOCGPGRP
The argument is a pointer to an
.Vt int .
Get the value of that
.Vt int
to the process-group
.Sy ID
that is receiving
.Dv SIGIO
or
.Dv SIGURG
signals for the socket referred to by the descriptor passed to
.Sy ioctl .
.It Dv SIOCCATMARK
The argument is a pointer to an
.Vt int .
Set the value of that
.Vt int
to
.Sy 1
if the read pointer for the socket referred to by the descriptor passed
to
.Xr ioctl 2
points to a mark in the data stream for an out-of-band message.
Set the value of that
.Vt int
to
.Sy 0
if the read pointer for the socket
referred to by the descriptor passed to
.Sy ioctl
does not point to a mark
in the data stream for an out-of-band message.
.El
.Sh SEE ALSO
.Xr ioctl 2 ,
.Xr getsockopt 3SOCKET