sockstat: split FreeBSD, NetBSD and Linux implementations (#12040)

* sockstat: split FreeBSD, NetBSD and Linux implementations

---------

Co-authored-by: Sebastiaan Speck <12570668+sebastiaanspeck@users.noreply.github.com>
Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>
Co-authored-by: Juri Dispan <juri.dispan@posteo.net>
Co-authored-by: cyqsimon <28627918+cyqsimon@users.noreply.github.com>

pages/freebsd/sockstat.md

@@ -0,0 +1,36 @@
+# sockstat
+
+> List open Internet or UNIX domain sockets.
+> More information: <https://man.freebsd.org/cgi/man.cgi?sockstat>.
+
+- View which users/processes are [l]istening on which ports:
+
+`sockstat -l`
+
+- Show information for IPv[4]/IPv[6] sockets [l]istening on specific [p]orts using a specific [P]rotocol:
+
+`sockstat -{{4|6}} -l -P {{tcp|udp|sctp|divert}} -p {{port1,port2...}}`
+
+- Also show [c]onnected sockets, not resolving [n]umeric UIDs to user names and using a [w]ider field size:
+
+`sockstat -cnw`
+
+- Only show sockets that belong to a specific [j]ail ID or name in [v]erbose mode:
+
+`sockstat -jv`
+
+- Display the protocol [s]tate and the remote [U]DP encapsulation port number, if applicable (these are currently only implemented for SCTP and TCP):
+
+`sockstat -sU`
+
+- Display the [C]ongestion control module and the protocol [S]tack, if applicable (these are currently only implemented for TCP):
+
+`sockstat -CS`
+
+- Only show Internet sockets if the local and foreign addresses are not in the loopback network prefix 127.0.0.0/8, or do not contain the IPv6 loopback address ::1:
+
+`sockstat -L`
+
+- Do not show the header ([q]uiet mode), showing [u]nix sockets and displaying the `inp_gencnt`:
+
+`sockstat -qui`

pages/linux/sockstat.md

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+# sockstat
+
+> List open Internet or UNIX domain sockets.
+> See also: `netstat`.
+> More information: <https://manned.org/sockstat>.
+
+- Show information for IPv4 and IPv6 sockets for both listening and connected sockets:
+
+`sockstat`
+
+- Show information for IPv[4]/IPv[6] sockets [l]istening on specific [p]orts using a specific p[R]otocol:
+
+`sockstat -{{4|6}} -l -R {{tcp|udp|raw|unix}} -p {{port1,port2...}}`
+
+- Also show [c]onnected sockets and [u]nix sockets:
+
+`sockstat -cu`
+
+- Only show sockets of the specified `pid` or process:
+
+`sockstat -P {{pid|process}}`
+
+- Only show sockets of the specified `uid` or user:
+
+`sockstat -U {{uid|user}}`
+
+- Only show sockets of the specified `gid` or group:
+
+`sockstat -G {{gid|group}}`

pages/netbsd/sockstat.md

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+# sockstat
+
+> List open Internet or UNIX domain sockets.
+> Note: this program is a rewrite for NetBSD 3.0 from FreeBSD's `sockstat`.
+> See also: `netstat`.
+> More information: <https://man.freebsd.org/cgi/man.cgi?sockstat>.
+
+- Show information for IPv4, IPv6 and Unix sockets for both listening and connected sockets:
+
+`sockstat`
+
+- Show information for IPv[4]/IPv[6] sockets [l]istening on specific [p]orts using a specific [P]rotocol:
+
+`sockstat -{{4|6}} -l -P {{tcp|udp|sctp|divert}} -p {{port1,port2...}}`
+
+- Also show [c]onnected sockets, showing [u]nix sockets:
+
+`sockstat -cu`
+
+- Only show [n]umeric output, without resolving symbolic names for addresses and ports:
+
+`sockstat -n`
+
+- Only list sockets of the specified address [f]amily:
+
+`sockstat -f {{inet|inet6|local|unix}}`