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lib/libc/sys/getsockopt.2

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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE. .\" SUCH DAMAGE.
.\" .\"
.\" @(#)getsockopt.2 8.4 (Berkeley) 5/2/95 .\" @(#)getsockopt.2 8.4 (Berkeley) 5/2/95
.\" $FreeBSD$ .\" $FreeBSD$
.\" .\"
.Dd February 10, 2019 .Dd Septemter 11, 2019
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.Dt GETSOCKOPT 2 .Dt GETSOCKOPT 2
.Os .Os
.Sh NAME .Sh NAME
.Nm getsockopt , .Nm getsockopt ,
.Nm setsockopt .Nm setsockopt
.Nd get and set options on sockets .Nd get and set options on sockets
.Sh LIBRARY .Sh LIBRARY
.Lb libc .Lb libc
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If the If the
.Dv SO_TIMESTAMP .Dv SO_TIMESTAMP
or or
.Dv SO_BINTIME .Dv SO_BINTIME
option is enabled on a option is enabled on a
.Dv SOCK_DGRAM .Dv SOCK_DGRAM
socket, the socket, the
.Xr recvmsg 2 .Xr recvmsg 2
call will return a timestamp corresponding to when the datagram was received. call may return a timestamp corresponding to when the datagram was received.
However, it may not, for example due to a resource shortage.
The The
.Va msg_control .Va msg_control
field in the field in the
.Vt msghdr .Vt msghdr
structure points to a buffer that contains a structure points to a buffer that contains a
.Vt cmsghdr .Vt cmsghdr
structure followed by a structure followed by a
.Vt "struct timeval" .Vt "struct timeval"
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