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head/lib/libc/sys/listen.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. | ||||
| .\" | .\" | ||||
| .\" From: @(#)listen.2 8.2 (Berkeley) 12/11/93 | .\" From: @(#)listen.2 8.2 (Berkeley) 12/11/93 | ||||
| .\" $FreeBSD$ | .\" $FreeBSD$ | ||||
| .\" | .\" | ||||
| .Dd August 18, 2016 | .Dd April 14, 2020 | ||||
| .Dt LISTEN 2 | .Dt LISTEN 2 | ||||
| .Os | .Os | ||||
| .Sh NAME | .Sh NAME | ||||
| .Nm listen | .Nm listen | ||||
| .Nd listen for connections on a socket | .Nd listen for connections on a socket | ||||
| .Sh LIBRARY | .Sh LIBRARY | ||||
| .Lb libc | .Lb libc | ||||
| .Sh SYNOPSIS | .Sh SYNOPSIS | ||||
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| specifies a hard limit on | specifies a hard limit on | ||||
| .Fa backlog ; | .Fa backlog ; | ||||
| if a value greater than | if a value greater than | ||||
| .Va kern.ipc.soacceptqueue | .Va kern.ipc.soacceptqueue | ||||
| or less than zero is specified, | or less than zero is specified, | ||||
| .Fa backlog | .Fa backlog | ||||
| is silently forced to | is silently forced to | ||||
| .Va kern.ipc.soacceptqueue . | .Va kern.ipc.soacceptqueue . | ||||
| .Pp | |||||
| If the listen queue overflows, the kernel will emit a LOG_DEBUG syslog message. | |||||
| The | |||||
| .Xr sysctl 3 | |||||
| MIB variable | |||||
| .Va kern.ipc.sooverinterval | |||||
| specifies a per-socket limit on how often the kernel will emit these messages. | |||||
| .Sh INTERACTION WITH ACCEPT FILTERS | .Sh INTERACTION WITH ACCEPT FILTERS | ||||
| When accept filtering is used on a socket, a second queue will | When accept filtering is used on a socket, a second queue will | ||||
| be used to hold sockets that have connected, but have not yet | be used to hold sockets that have connected, but have not yet | ||||
| met their accept filtering criteria. | met their accept filtering criteria. | ||||
| Once the criteria has been | Once the criteria has been | ||||
| met, these sockets will be moved over into the completed connection | met, these sockets will be moved over into the completed connection | ||||
| queue to be | queue to be | ||||
| .Xr accept 2 Ns ed . | .Xr accept 2 Ns ed . | ||||
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