| Value | Meaning |
|---|---|
| DEBUGSO_DEBUG | Record debugging information |
| BROADCASTSO_BROADCAST | Allow transmission of broadcast messages |
| REUSEADDRSO_REUSEADDR | Allow local reuse of address |
| REUSEPORTSO_REUSEPORT | Allow local reuse of port On Windows, this is equivalent to SocketOption.REUSEADDR. There is in fact no option named REUSEPORT. However, SocketOption.REUSEADDR matches the behavior of SocketOption.REUSEPORT on other platforms. Further details on this topic can be found here: https://learn.microsoft.com/en-us/windows/win32/winsock/using-so-reuseaddr-and-so-exclusiveaddruse On Linux, this ensures fair distribution of incoming connections accross threads. See_Also: https://lwn.net/Articles/542629/ |
| LINGERSO_LINGER | Linger on close if unsent data is present |
| OOBINLINESO_OOBINLINE | Receive out-of-band data in band |
| SNDBUFSO_SNDBUF | Send buffer size |
| RCVBUFSO_RCVBUF | Receive buffer size |
| DONTROUTESO_DONTROUTE | Do not route |
| SNDTIMEOSO_SNDTIMEO | Send timeout |
| RCVTIMEOSO_RCVTIMEO | Receive timeout |
| ERRORSO_ERROR | Retrieve and clear error status |
| KEEPALIVESO_KEEPALIVE | Enable keep-alive packets |
| ACCEPTCONNSO_ACCEPTCONN | Listen |
| RCVLOWATSO_RCVLOWAT | Minimum number of input bytes to process |
| SNDLOWATSO_SNDLOWAT | Minimum number of output bytes to process |
| TYPESO_TYPE | Socket type |
| TCP_NODELAY.TCP_NODELAY | Disable the Nagle algorithm for send coalescing |
| IPV6_UNICAST_HOPS.IPV6_UNICAST_HOPS | IP unicast hop limit |
| IPV6_MULTICAST_IF.IPV6_MULTICAST_IF | IP multicast interface |
| IPV6_MULTICAST_LOOP.IPV6_MULTICAST_LOOP | IP multicast loopback |
| IPV6_MULTICAST_HOPS.IPV6_MULTICAST_HOPS | IP multicast hops |
| IPV6_JOIN_GROUP.IPV6_JOIN_GROUP | Add an IP group membership |
| IPV6_LEAVE_GROUP.IPV6_LEAVE_GROUP | Drop an IP group membership |
| IPV6_V6ONLY.IPV6_V6ONLY | Treat wildcard bind as AF_INET6-only |
Specifies a socket option: