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POSIX Compatibility

proposals/sockets/Posix-compatibility.md

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POSIX Compatibility

This document provides an overview of the POSIX interface along with common non-standard extensions and their mapping to functionalities provided by this proposal.

General

I/O completion polling (poll, select, pselect, epoll_* (non-standard), kqueue (non-standard)) <a name="select"></a>

Use the various subscribe methods to obtain a pollable handle. Then use that to wait for IO events using the wasi:io/poll interface.

Non-blocking mode (FIONBIO, SOCK_NONBLOCK, O_NONBLOCK) <a name="nonblock"></a>

All WASI sockets are non-blocking and can not be configured to block. Blocking behaviour can be recreated in userland (or in wasi-libc) by calling pollable::block on the relevant pollable.

TCP urgent data (sockatmark, MSG_OOB, SO_OOBINLINE, SIOCATMARK) <a name="oob"></a>

Out-of-band (OOB) data is currently not included in this proposal. Application-level usage of the TCP "urgent" flag is rare in practice and discouraged in general. Including it in WASI would probably interfere with the ability to use WASI/ComponentModel streams.

Peeking (MSG_PEEK) <a name="peek"></a>

Peeking support is not provided by this proposal directly. Including it in WASI would probably interfere with the ability to use WASI/ComponentModel streams.

Support for it might be able to be recreated in userland (or in wasi-libc).

Writing to closed streams (SIGPIPE, SO_NOSIGPIPE) <a name="sigpipe"></a>

WASI has no concept of 'signals'. Implementations that require it are encouraged to set the SO_NOSIGPIPE option to true, to increase cross-platform consistency. Writing to a closed stream in WASI returns a regular error.

Close-on-exec (FD_CLOEXEC, SOCK_CLOEXEC, O_CLOEXEC) <a name="cloexec"></a>

Not included in proposal. WASI has no concept of UNIX-style processes.

Functions

socket

connect

bind

listen

accept, accept4 (non-standard)

To collect the remote address, call tcp-socket::remote-address on the newly accepted client socket.

Some platforms provide an accept4 variant with additional flags. None of these flags make sense in the context of this proposal. See SOCK_NONBLOCK & SOCK_CLOEXEC.

getsockname, getpeername

read, readv, recv, recvfrom, recvmsg, recvmmsg (non-standard)

TCP sockets can be read using the input-stream returned by connect or accept. UDP sockets can be read using the incoming-datagram-stream returned by udp-socket::stream.

The various POSIX functions should be implementable on top of these two resources.

None of the flags are directly present in WASI Sockets:

  • MSG_DONTWAIT: This is always the case.
  • MSG_OOB on TCP sockets: Not supported
  • MSG_OOB on UDP sockets: N/A
  • MSG_PEEK: No direct support
  • MSG_TRUNC on TCP sockets: N/A
  • MSG_TRUNC on UDP sockets: Not needed, the returned data array always has the exact perfect size.
  • MSG_WAITALL on TCP sockets: Emulatable in userspace.
  • MSG_WAITALL on UDP sockets: N/A
  • MSG_EOR: N/A (not supported on TCP & UDP sockets)
  • MSG_CMSG_CLOEXEC: N/A (only used on Unix domain sockets)

Receiving ancillary messages: None supported as of yet. But see the various "RECV" socket options below.

write, writev, send, sendto, sendmsg, sendmmsg (non-standard)

TCP sockets can be written to using the output-stream returned by connect or accept. UDP sockets can be written to using the outgoing-datagram-stream returned by udp-socket::stream.

The various POSIX functions should be implementable on top of these two resources.

None of the flags are directly present in WASI Sockets:

  • MSG_DONTROUTE: Not included in proposal at the moment.
  • MSG_DONTWAIT: This is always the case.
  • MSG_NOSIGNAL: This is always the case.
  • MSG_OOB on TCP sockets: Not supported
  • MSG_OOB on UDP sockets: N/A
  • MSG_EOR: N/A (not supported on TCP & UDP sockets)

Sending ancillary messages: None supported as of yet.

sendfile (non-standard)

  • TCP: Part of the wasi:io/streams proposal as output-stream::splice
  • UDP: N/A

shutdown

sockatmark

  • TCP: Not supported, see OOB.
  • UDP: N/A

close

Dropping the socket resource effectively performs a close.

socketpair, connectat (non-standard), bindat (non-standard)

Specifically for UNIX domain sockets. Out of scope for this proposal.

fcntl

ioctl

getsockopt, setsockopt

Socket options have been split out into distinct functions. See table below.

Socket options

POSIX defines the signatures of the getsockopt & setsockopt functions, but does not provide much guidance on the individual socket options themselves. Because of this lack of a central authority, a list has been compiled of the options that are used "in the wild".

The results are not intended to be an exhaustive overview of all possible network applications, but rather to provide input on which options are worth standardizing in WASI.

Additionally, most columns have been populated semi-automatically by grepping through the respective codebases. The results have not been manually verified and therefore may not be 100% correct.

Legend:

  • ✅ = Included in proposal.
  • ⚠️ = Partially supported.
  • ⛔ = Consciously decided not to include in WASI. See notes for explanation.
  • ❔ = Not included (yet), for no particular reason.
OptionNotesUsed/implemented by
✅SO_DOMAIN
<sub>SO_PROTOCOL_INFO on Windows</sub>tcp-socket::address-family
udp-socket::address-familylinux, windows, freebsd, .net
✅SO_ACCEPTCONNtcp-socket::is-listeningposix, linux, windows, macos, freebsd, .net
✅IP_TTLtcp-socket::(set-)hop-limit
udp-socket::(set-)unicast-hop-limitlinux, windows, macos, freebsd, jvm, .net, rust, libuv
✅IPV6_UNICAST_HOPStcp-socket::(set-)hop-limit
udp-socket::(set-)unicast-hop-limitposix, linux, windows, macos, freebsd, jvm, .net, libuv
✅SO_RCVBUFtcp-socket::(set-)receive-buffer-size
udp-socket::(set-)receive-buffer-sizeposix, linux, windows, macos, freebsd, jvm, .net, libuv, go, nginx, msquic
✅SO_SNDBUFtcp-socket::(set-)send-buffer-size
udp-socket::(set-)send-buffer-sizeposix, linux, windows, macos, freebsd, jvm, .net, libuv, go, nginx, curl
✅SO_KEEPALIVEtcp-socket::(set-)keep-alive-enabledposix, linux, windows, macos, freebsd, jvm, .net, libuv, go, openssl, nginx, curl, exim
✅TCP_KEEPIDLE
<sub>TCP_KEEPALIVE on MacOS</sub>tcp-socket::(set-)keep-alive-idle-timelinux, windows, macos, freebsd, jvm, .net, libuv, go, nginx, curl
✅TCP_KEEPINTVLtcp-socket::(set-)keep-alive-intervallinux, windows, macos, freebsd, jvm, .net, libuv, go, nginx, curl
✅TCP_KEEPCNTtcp-socket::(set-)keep-alive-countlinux, windows, macos, freebsd, jvm, .net, libuv, nginx
✅SO_REUSEADDR for TCPEnabled by default. See tcp-socket::bindposix, linux, windows, macos, freebsd, jvm, .net, libuv, go, openssl, nginx, curl, exim
⚠️IPV6_V6ONLYIn WASI this always true. #1posix, linux, windows, macos, freebsd, jvm, .net, libuv, go, openssl, curl, msquic, exim
⛔SO_ERRORNot necessary. WIT has (or will have) native support for asynchronous results.posix, linux, windows, macos, freebsd, jvm, .net, rust, libuv, go, openssl, nginx, curl, msquic
⛔SO_TYPECan be inferred from the socket resource type.posix, linux, windows, macos, freebsd, jvm, .net, go, openssl, nginx, curl, exim
⛔SO_PROTOCOL
<sub>SO_PROTOCOL_INFO on Windows</sub>Can be inferred from the socket resource type.linux, windows, freebsd, .net, exim
⛔IP_HDRINCLOut of scope. Raw sockets only.linux, windows, macos, freebsd, .net
⛔IPV6_HDRINCLOut of scope. Raw sockets only.linux, windows, .net
⛔SO_RCVTIMEOWASI sockets are always non-blocking. Timeouts can be recreated in libc.posix, linux, windows, macos, freebsd, jvm, .net, rust, openssl, curl
⛔SO_SNDTIMEOWASI sockets are always non-blocking. Timeouts can be recreated in libc.posix, windows, macos, freebsd, .net, rust, openssl
⛔SO_OOBINLINENot supported, see OOBposix, linux, windows, macos, freebsd, jvm, .net
⛔SO_PEERCREDOut of scope; UNIX domain sockets only.linux, jvm, .net
⛔SO_PEERSECOut of scope; UNIX domain sockets only.linux
⛔SO_NOSIGPIPENot supported, see SIGPIPEmacos, freebsd, libuv, curl
❔IP_RECVPKTINFO
<sub>IP_PKTINFO on Linux & Windows</sub>
<sub>IP_RECVDSTADDR+IP_RECVIF on MacOS & FreeBSD</sub>#77linux, windows, macos, freebsd, .net, openssl, nginx, msquic
❔IPV6_RECVPKTINFO
<sub>IPV6_PKTINFO on Windows</sub>#77linux, windows, macos, freebsd, .net, openssl, nginx, msquic
❔IP_RECVTOS#78linux, windows, macos, freebsd, msquic
❔IPV6_RECVTCLASS#78linux, windows, macos, freebsd, msquic
❔IP_TOS#78linux, windows, macos, freebsd, jvm, .net, exim
❔IPV6_TCLASS#78linux, macos, freebsd, jvm, .net, exim
❔TCP_ECN_MODE#78macos
❔TCP_ENABLE_ECN#78macos
❔SO_LINGER#80posix, linux, windows, macos, freebsd, jvm, .net, rust, libuv, go, openssl, nginx
❔IP_DONTFRAG
<sub>IP_DONTFRAGMENT on Windows</sub>#79linux, windows, macos, freebsd, jvm, .net, openssl, nginx, msquic
❔IPV6_DONTFRAG#79linux, windows, macos, freebsd, jvm, .net, openssl, nginx, msquic
❔IP_MTU_DISCOVER#79linux, windows, openssl, nginx, curl, msquic
❔IPV6_MTU_DISCOVER#79linux, windows, openssl, nginx, curl, msquic
❔TCP_NODELAY#75posix, linux, windows, macos, freebsd, jvm, .net, rust, libuv, go, openssl, nginx, curl, exim
❔TCP_CORK
<sub>TCP_NOPUSH on MacOS & FreeBSD</sub>#75linux, macos, freebsd, nginx, exim
❔SO_REUSEADDR for UDP#74posix, linux, windows, macos, freebsd, jvm, .net, libuv, go, openssl, nginx, curl, exim
❔SO_EXCLUSIVEADDRUSE#74windows
❔SO_RANDOMIZE_PORT#74windows
❔SO_RANDOMPORT#74macos
❔IP_BIND_ADDRESS_NO_PORT#74linux, nginx, curl
❔SO_PORT_SCALABILITY#74windows
❔SO_REUSE_UNICASTPORT#74windows, .net
❔SO_REUSEPORT#74linux, macos, freebsd, .net, libuv, go, nginx, msquic
❔SO_REUSEPORT_LB#74freebsd, nginx
❔SO_ATTACH_REUSEPORT_CBPF#74linux, msquic
❔SO_ATTACH_REUSEPORT_EBPF#74linux, nginx
❔SO_DETACH_REUSEPORT_BPF#74linux
❔TCP_REUSPORT_LB_NUMA#74freebsd
❔SO_INCOMING_CPU#74linux
❔SO_INCOMING_NAPI_ID#74linux, jvm
❔SO_BINDTODEVICE#74linux, libuv, go, curl
❔SO_BINDTOIFINDEX#74linux
❔IP_UNICAST_IF#74linux, windows, msquic
❔IPV6_UNICAST_IF#74linux, windows, msquic
❔IP_BOUND_IF#74macos
❔IPV6_BOUND_IF#74macos
❔IP_FREEBIND#74linux
❔IPV6_FREEBIND#74linux
❔IP_TRANSPARENT#74linux, nginx
❔IPV6_TRANSPARENT#74linux, nginx
❔IP_BINDANY#74freebsd, nginx
❔IPV6_BINDANY#74freebsd, nginx
❔SO_REUSE_MULTICASTPORT#74, #73windows
❔SO_BROADCAST#73posix, linux, windows, macos, freebsd, jvm, .net, rust, libuv, go
❔MCAST_JOIN_GROUP
<sub>Supersedes: IP_ADD_MEMBERSHIP</sub>
<sub>Supersedes: IPV6_JOIN_GROUP</sub>
<sub>Supersedes: IPV6_ADD_MEMBERSHIP</sub>#73posix, linux, windows, macos, freebsd, jvm, .net, rust, libuv, go
❔MCAST_LEAVE_GROUP
<sub>Supersedes: IP_DROP_MEMBERSHIP</sub>
<sub>Supersedes: IPV6_LEAVE_GROUP</sub>
<sub>Supersedes: IPV6_DROP_MEMBERSHIP</sub>#73posix, linux, windows, macos, freebsd, jvm, .net, rust, libuv
❔MCAST_JOIN_SOURCE_GROUP
<sub>Supersedes: IP_ADD_SOURCE_MEMBERSHIP</sub>#73linux, windows, macos, freebsd, jvm, .net, libuv
❔MCAST_LEAVE_SOURCE_GROUP
<sub>Supersedes: IP_DROP_SOURCE_MEMBERSHIP</sub>#73linux, windows, macos, freebsd, jvm, .net, libuv
❔MCAST_BLOCK_SOURCE
<sub>Supersedes: IP_BLOCK_SOURCE</sub>#73linux, windows, macos, freebsd, jvm, .net
❔MCAST_UNBLOCK_SOURCE
<sub>Supersedes: IP_UNBLOCK_SOURCE</sub>#73linux, windows, macos, freebsd, jvm, .net
❔IP_MSFILTER#73linux, windows, macos, freebsd
❔IPV6_MSFILTER#73macos, freebsd
❔IP_MULTICAST_IF#73linux, windows, macos, freebsd, jvm, .net, libuv, go
❔IPV6_MULTICAST_IF#73posix, linux, windows, macos, freebsd, jvm, .net, libuv, go
❔IP_MULTICAST_LOOP#73linux, windows, macos, freebsd, jvm, .net, rust, libuv, go
❔IPV6_MULTICAST_LOOP#73posix, linux, windows, macos, freebsd, jvm, .net, rust, libuv, go
❔IP_MULTICAST_TTL#73linux, windows, macos, freebsd, jvm, .net, rust, libuv
❔IPV6_MULTICAST_HOPS#73posix, linux, windows, macos, freebsd, jvm, .net, libuv
❔IP_MULTICAST_ALL#73linux
❔IPV6_MULTICAST_ALL#73linux
❔IP_MULTICAST_IFINDEX#73macos
❔TCP_FASTOPEN#81linux, windows, macos, freebsd, openssl, nginx, exim
❔TCP_FASTOPEN_CONNECT#81linux, openssl, curl, exim
❔TCP_FASTOPEN_KEY#81linux
❔TCP_FASTOPEN_NO_COOKIE#81linux
❔TCP_FASTOPEN_FORCE_ENABLE#81macos
❔TCP_FASTOPEN_FORCE_HEURISTICS#81macos
❔SO_SNDLOWATNot usefully implemented on Linux & Windows.posix, linux, macos, freebsd, .net, nginx
❔SO_RCVLOWATposix, linux, macos, freebsd, .net
❔IP_RECVTTLlinux, windows, macos, freebsd
❔IPV6_RECVHOPLIMITlinux, macos, freebsd
❔SO_DEBUGposix, linux, windows, macos, freebsd, .net
❔SO_DONTROUTEposix, linux, windows, macos, freebsd, .net
❔TCP_INFO
<sub>via ioctl on Windows</sub>linux, windows, macos, freebsd, nginx, exim
❔IP_IPSEC_POLICYlinux, macos, freebsd
❔IP_MINTTLlinux, freebsd
❔IPV6_MINHOPCOUNTlinux
❔IP_MTUlinux, windows, openssl
❔IPV6_MTUlinux, windows, openssl
❔IPV6_PATHMTUlinux, macos, freebsd
❔IPV6_RECVPATHMTUlinux, macos, freebsd
❔IPV6_USE_MIN_MTUlinux, macos, freebsd
❔IP_OPTIONSlinux, windows, macos, freebsd, .net, exim
❔IP_RECVOPTSlinux, macos, freebsd
❔IP_RECVORIGDSTADDR
<sub>IP_ORIGDSTADDR on FreeBSD</sub>linux, freebsd
❔IP_RECVRETOPTS
<sub>Alias: IP_RETOPTS</sub>linux, macos, freebsd
❔IPV6_2292DSTOPTSlinux, macos, freebsd
❔IPV6_2292HOPLIMITlinux, macos, freebsd
❔IPV6_2292HOPOPTSlinux, macos, freebsd
❔IPV6_2292PKTINFOlinux, macos, freebsd
❔IPV6_2292PKTOPTIONSlinux, macos, freebsd
❔IPV6_2292RTHDRlinux, macos, freebsd
❔IPV6_AUTOFLOWLABELlinux, macos, freebsd
❔IPV6_CHECKSUMlinux, macos, freebsd
❔IPV6_DSTOPTSlinux, macos, freebsd
❔IPV6_HOPOPTSlinux, macos, freebsd
❔IPV6_IPSEC_POLICYlinux, macos, freebsd
❔IPV6_NEXTHOPlinux, macos, freebsd
❔IPV6_RECVDSTOPTSlinux, macos, freebsd
❔IPV6_RECVHOPOPTSlinux, macos, freebsd
❔IPV6_RECVORIGDSTADDR
<sub>IPV6_ORIGDSTADDR on FreeBSD</sub>linux, freebsd
❔IPV6_RECVRTHDRlinux, macos, freebsd
❔IPV6_RTHDRlinux, macos, freebsd
❔IPV6_RTHDRDSTOPTSlinux, macos, freebsd
❔SO_TIMESTAMPlinux, macos, freebsd
❔TCP_CONGESTIONlinux, freebsd
❔TCP_MAXSEGlinux, macos, freebsd
❔TCP_MD5SIGlinux, freebsd
❔TCP_NOTSENT_LOWATlinux, macos
❔UDP_ENCAPlinux, freebsd
❔IP_CHECKSUMlinux
❔IP_NODEFRAGlinux
❔IP_PASSSEClinux
❔IP_PKTOPTIONSlinux
❔IP_RECVERRlinux, libuv
❔IP_RECVERR_RFC4884linux
❔IP_RECVFRAGSIZElinux
❔IP_ROUTER_ALERTlinux
❔IP_XFRM_POLICYlinux
❔IPV6_ADDR_PREFERENCESlinux
❔IPV6_ADDRFORMlinux
❔IPV6_AUTHHDRlinux
❔IPV6_FLOWINFOlinux
❔IPV6_FLOWINFO_SENDlinux
❔IPV6_FLOWLABEL_MGRlinux
❔IPV6_JOIN_ANYCASTlinux
❔IPV6_LEAVE_ANYCASTlinux
❔IPV6_RECVERRlinux, libuv
❔IPV6_RECVERR_RFC4884linux
❔IPV6_RECVFRAGSIZElinux
❔IPV6_ROUTER_ALERTlinux
❔IPV6_ROUTER_ALERT_ISOLATElinux
❔IPV6_XFRM_POLICYlinux
❔SO_ATTACH_FILTERlinux
❔SO_BPF_EXTENSIONSlinux
❔SO_BSDCOMPATlinux
❔SO_BUF_LOCKlinux
❔SO_BUSY_POLLlinux
❔SO_BUSY_POLL_BUDGETlinux
❔SO_CNX_ADVICElinux
❔SO_COOKIElinux, nginx
❔SO_DETACH_FILTERlinux
❔SO_LOCK_FILTERlinux
❔SO_MARKlinux
❔SO_MEMINFOlinux
❔SO_NETNS_COOKIElinux
❔SO_NO_CHECKlinux
❔SO_NOFCSlinux
❔SO_PASSCREDlinux
❔SO_PASSSEClinux
❔SO_PEEK_OFFlinux
❔SO_PEERNAMElinux
❔SO_PREFER_BUSY_POLLlinux
❔SO_PRIORITYlinux
❔SO_RCVBUFFORCElinux
❔SO_RCVMARKlinux
❔SO_RESERVE_MEMlinux
❔SO_RXQ_OVFLlinux
❔SO_SELECT_ERR_QUEUElinux
❔SO_SNDBUFFORCElinux
❔SO_TIMESTAMPINGlinux
❔SO_TIMESTAMPNSlinux
❔SO_TXREHASHlinux
❔SO_TXTIMElinux
❔SO_WIFI_STATUSlinux
❔SO_ZEROCOPYlinux
❔TCP_CC_INFOlinux
❔TCP_CM_INQlinux
❔TCP_DEFER_ACCEPTlinux, nginx
❔TCP_INQlinux
❔TCP_LINGER2linux
❔TCP_MD5SIG_EXTlinux
❔TCP_QUEUE_SEQlinux
❔TCP_QUICKACKlinux, jvm, exim
❔TCP_REPAIRlinux
❔TCP_REPAIR_OPTIONSlinux
❔TCP_REPAIR_QUEUElinux
❔TCP_REPAIR_WINDOWlinux
❔TCP_SAVE_SYNlinux
❔TCP_SAVED_SYNlinux
❔TCP_SYNCNTlinux
❔TCP_THIN_DUPACKlinux
❔TCP_THIN_LINEAR_TIMEOUTSlinux
❔TCP_TIMESTAMPlinux
❔TCP_TX_DELAYlinux
❔TCP_ULPlinux
❔TCP_USER_TIMEOUTlinux
❔TCP_WINDOW_CLAMPlinux
❔TCP_ZEROCOPY_RECEIVElinux
❔UDP_CORKlinux
❔UDP_GROlinux, msquic
❔UDP_NO_CHECK6_RXlinux
❔UDP_NO_CHECK6_TXlinux
❔UDP_SEGMENTlinux, nginx
❔IP_ADD_IFLISTwindows
❔IP_DEL_IFLISTwindows
❔IP_GET_IFLISTwindows
❔IP_IFLISTwindows
❔IP_ORIGINAL_ARRIVAL_IFwindows
❔IP_ORIGINAL_ARRIVAL_IFwindows
❔IP_RECEIVE_BROADCASTwindows
❔IP_USER_MTUwindows
❔IP_WFP_REDIRECT_CONTEXTwindows
❔IP_WFP_REDIRECT_RECORDSwindows
❔IPV6_ADD_IFLISTwindows
❔IPV6_DEL_IFLISTwindows
❔IPV6_GET_IFLISTwindows
❔IPV6_IFLISTwindows
❔IPV6_PROTECTION_LEVELwindows
❔IPV6_RECVIFwindows
❔IPV6_USER_MTUwindows
❔SO_BSP_STATEwindows
❔SO_CONDITIONAL_ACCEPTwindows
❔SO_CONNDATAwindows
❔SO_CONNDATALENwindows
❔SO_CONNECT_TIMEwindows
❔SO_CONNOPTwindows
❔SO_CONNOPTLENwindows
❔SO_DISCDATAwindows
❔SO_DISCDATALENwindows
❔SO_DISCOPTwindows
❔SO_DISCOPTLENwindows
❔SO_GROUP_IDwindows
❔SO_GROUP_PRIORITYwindows
❔SO_MAX_MSG_SIZEwindows
❔SO_MAXDGwindows
❔SO_MAXPATHDGwindows
❔SO_OPENTYPEwindows
❔SO_PAUSE_ACCEPTwindows
❔SO_PROTOCOL_INFOwindows
❔SO_PROTOCOL_INFOAwindows
❔SO_PROTOCOL_INFOWwindows
❔SO_UPDATE_ACCEPT_CONTEXTwindows
❔SO_UPDATE_CONNECT_CONTEXTwindows
❔TCP_BSDURGENTwindows
❔TCP_EXPEDITED_1122windows
❔TCP_FAIL_CONNECT_ON_ICMP_ERRORwindows
❔TCP_ICMP_ERROR_INFOwindows
❔TCP_MAXRTwindows
❔TCP_TIMESTAMPSwindows
❔UDP_CHECKSUM_COVERAGEwindows
❔UDP_NOCHECKSUMwindows
❔UDP_RECV_MAX_COALESCED_SIZEwindows, msquic
❔UDP_SEND_MSG_SIZEwindows, msquic
❔IP_FAITHmacos
❔IP_NAT__XXXmacos
❔IP_STRIPHDRmacos
❔IP_TRAFFIC_MGT_BACKGROUNDmacos
❔IPV6_3542DSTOPTSmacos
❔IPV6_3542HOPLIMITmacos
❔IPV6_3542HOPOPTSmacos
❔IPV6_3542NEXTHOPmacos
❔IPV6_3542PKTINFOmacos
❔IPV6_3542RTHDRmacos
❔IPV6_RTHDR_LOOSEmacos
❔IPV6_RTHDR_STRICTmacos
❔IPV6_RTHDR_TYPE_0macos
❔SO_AWDL_UNRESTRICTEDmacos
❔SO_CFIL_SOCK_IDmacos
❔SO_DELEGATEDmacos
❔SO_DELEGATED_UUIDmacos
❔SO_DONTTRUNCmacos
❔SO_EXECPATHmacos
❔SO_EXTENDED_BK_IDLEmacos
❔SO_FLOW_DIVERT_TOKENmacos
❔SO_FLUSHmacos
❔SO_INTCOPROC_ALLOWmacos
❔SO_LINGER_SECmacos
❔SO_MARK_CELLFALLBACKmacos
❔SO_MPKL_SEND_INFOmacos
❔SO_NECP_ATTRIBUTESmacos
❔SO_NECP_CLIENTUUIDmacos
❔SO_NECP_LISTENUUIDmacos
❔SO_NET_SERVICE_TYPEmacos
❔SO_NETSVC_MARKING_LEVELmacos
❔SO_NKEmacos
❔SO_NOADDRERRmacos
❔SO_NOAPNFALLBKmacos
❔SO_NOTIFYCONFLICTmacos
❔SO_NOWAKEFROMSLEEPmacos
❔SO_NP_EXTENSIONSmacos
❔SO_NREADmacos
❔SO_NUMRCVPKTmacos
❔SO_NWRITEmacos
❔SO_OPPORTUNISTICmacos
❔SO_QOSMARKING_POLICY_OVERRIDEmacos
❔SO_RECV_ANYIFmacos
❔SO_RESTRICTIONSmacos
❔SO_REUSESHAREUIDmacos
❔SO_STATISTICS_EVENTmacos
❔SO_TC_NET_SERVICE_OFFSETmacos
❔SO_TC_NETSVC_SIGmacos
❔SO_TIMESTAMP_CONTINUOUSmacos
❔SO_TIMESTAMP_MONOTONICmacos
❔SO_TRAFFIC_MGT_BACKGROUNDmacos
❔SO_UPCALLCLOSEWAITmacos
❔SO_WANT_KEV_SOCKET_CLOSEDmacos
❔SO_WANTMOREmacos
❔SO_WANTOOBFLAGmacos
❔MPTCP_ALTERNATE_PORTmacos
❔MPTCP_EXPECTED_PROGRESS_TARGETmacos
❔MPTCP_FORCE_ENABLEmacos
❔MPTCP_FORCE_VERSIONmacos
❔MPTCP_SERVICE_TYPEmacos
❔PERSIST_TIMEOUTmacos
❔TCP_ADAPTIVE_READ_TIMEOUTmacos
❔TCP_ADAPTIVE_WRITE_TIMEOUTmacos
❔TCP_CONNECTION_INFOmacos
❔TCP_CONNECTIONTIMEOUTmacos
❔TCP_DISABLE_BLACKHOLE_DETECTIONmacos
❔TCP_KEEPALIVE_OFFLOADmacos
❔TCP_MEASURE_BW_BURSTmacos
❔TCP_MEASURE_SND_BWmacos
❔TCP_NOTIFY_ACKNOWLEDGEMENTmacos
❔TCP_NOTIMEWAITmacos
❔TCP_PEER_PIDmacos
❔TCP_RXT_CONNDROPTIMEmacos
❔TCP_RXT_FINDROPmacos
❔TCP_RXT_MINIMUM_TIMEOUTmacos
❔TCP_SENDMOREACKSmacos
❔UDP_KEEPALIVE_OFFLOADmacos
❔UDP_NOCKSUMmacos
❔ICMP6_FILTERmacos, freebsd
❔IP_MULTICAST_VIFmacos, freebsd
❔IP_PORTRANGEmacos, freebsd, go
❔IP_RSVP_OFFmacos, freebsd
❔IP_RSVP_ONmacos, freebsd
❔IP_RSVP_VIF_OFFmacos, freebsd
❔IP_RSVP_VIF_ONmacos, freebsd
❔IPV6_2292NEXTHOPmacos, freebsd
❔IPV6_BINDV6ONLYmacos, freebsd
❔IPV6_FAITHmacos, freebsd
❔IPV6_PKTOPTIONSmacos, freebsd
❔IPV6_PORTRANGEmacos, freebsd, go
❔IPV6_PREFER_TEMPADDRmacos, freebsd
❔IPV6_RECVRTHDRDSTOPTSmacos, freebsd
❔SO_ACCEPTFILTERmacos, freebsd, nginx
❔SO_LABELmacos, freebsd
❔SO_PEERLABELmacos, freebsd
❔SO_USELOOPBACKmacos, freebsd
❔TCP_NOOPTmacos, freebsd
❔IP_BINDMULTIfreebsd
❔IP_FLOWIDfreebsd
❔IP_FLOWTYPEfreebsd
❔IP_MAX_MEMBERSHIPSfreebsd
❔IP_ONESBCASTfreebsd
❔IP_RECVFLOWIDfreebsd
❔IP_RECVRSSBUCKETIDfreebsd
❔IP_RSS_LISTEN_BUCKETfreebsd
❔IP_RSSBUCKETIDfreebsd
❔IP_SENDSRCADDRfreebsd, nginx
❔IP_VLAN_PCPfreebsd
❔IPV6_AUTH_LEVELfreebsd
❔IPV6_BINDMULTIfreebsd
❔IPV6_ESP_NETWORK_LEVELfreebsd
❔IPV6_ESP_TRANS_LEVELfreebsd
❔IPV6_FLOWIDfreebsd
❔IPV6_FLOWTYPEfreebsd
❔IPV6_IPCOMP_LEVELfreebsd
❔IPV6_RECVFLOWIDfreebsd
❔IPV6_RECVRSSBUCKETIDfreebsd
❔IPV6_RSS_LISTEN_BUCKETfreebsd
❔IPV6_RSSBUCKETIDfreebsd
❔IPV6_VLAN_PCPfreebsd
❔SO_BINTIMEfreebsd
❔SO_LISTENINCQLENfreebsd
❔SO_LISTENQLENfreebsd, exim
❔SO_LISTENQLIMITfreebsd
❔SO_MAX_PACING_RATEfreebsd
❔SO_NO_DDPfreebsd
❔SO_NO_OFFLOADfreebsd
❔SO_RERRORfreebsd
❔SO_SETFIBfreebsd, nginx
❔SO_TS_BINTIMEfreebsd
❔SO_TS_CLOCKfreebsd
❔SO_TS_CLOCK_MAXfreebsd
❔SO_TS_DEFAULTfreebsd
❔SO_TS_MONOTONICfreebsd
❔SO_TS_REALTIMEfreebsd
❔SO_TS_REALTIME_MICROfreebsd
❔SO_USER_COOKIEfreebsd
❔TCP_CCALGOOPTfreebsd
❔TCP_DEFER_OPTIONSfreebsd
❔TCP_DELACKfreebsd
❔TCP_FAST_RSM_HACKfreebsd
❔TCP_FIN_IS_RSTfreebsd
❔TCP_FUNCTION_ALIASfreebsd
❔TCP_FUNCTION_BLKfreebsd
❔TCP_HDWR_RATE_CAPfreebsd
❔TCP_HDWR_UP_ONLYfreebsd
❔TCP_IDLE_REDUCEfreebsd
❔TCP_IWND_NBfreebsd
❔TCP_IWND_NSEGfreebsd
❔TCP_KEEPINITfreebsd
❔TCP_LOGfreebsd
❔TCP_LOG_LIMITfreebsd
❔TCP_LOG_TAGfreebsd
❔TCP_LOGBUFfreebsd
❔TCP_LOGDUMPfreebsd
❔TCP_LOGDUMPIDfreebsd
❔TCP_LOGIDfreebsd
❔TCP_LOGID_CNTfreebsd
❔TCP_LRDfreebsd
❔TCP_MAXPEAKRATEfreebsd
❔TCP_MAXUNACKTIMEfreebsd
❔TCP_PCAP_INfreebsd
❔TCP_PCAP_OUTfreebsd
❔TCP_PERF_INFOfreebsd
❔TCP_PROC_ACCOUNTINGfreebsd
❔TCP_REMOTE_UDP_ENCAPS_PORTfreebsd
❔TCP_RXTLS_ENABLEfreebsd
❔TCP_RXTLS_MODEfreebsd
❔TCP_STATSfreebsd
❔TCP_TXTLS_ENABLEfreebsd
❔TCP_TXTLS_MODEfreebsd
❔TCP_USE_CMP_ACKSfreebsd
❔TCP_USER_LOGfreebsd