The
ioctls
listed in this manual page apply directly to sockets, independent of any
underlying protocol.
The
setsockopt
call (see
getsockopt(SSC))
is the primary method for operating on sockets, rather
than on the underlying protocol or network interface.
ioctls
for a specific network interface or protocol are documented in the
manual page for that interface or protocol.
SIOCSPGRP
The argument is a pointer to an
int.
Set the process-group ID that will subsequently receive
SIGIO
or
SIGURG
signals for the socket referred to by the descriptor passed to
ioctl
to the value of that
int.
SIOCGPGRP
The argument is a pointer to an
int.
Set the value of that
int
to the process-group
ID
that is receiving
SIGIO
or
SIGURG
signals for the socket referred to by the descriptor passed to
ioctl.
SIOCATMARK
The argument is a pointer to an
int.
Set the value of that
int
to 1 if the read pointer for the socket referred to by the descriptor passed
to
ioctl
points to a mark in the data stream for an out-of-band message.
Set the value of that int to 0 if the read pointer for the socket
referred to by the descriptor passed to ioctl
does not point to a mark in the data stream for an
out-of-band message.