Top Forums UNIX for Dummies Questions & Answers what is the advantage of unix sockets? Post 302525367 by DGPickett on Thursday 26th of May 2011 12:55:41 PM
Old 05-26-2011
TCP and UDP are different facilities under IP, but UNIX sockets are local to the host and simpler, like pipes.

TCP creates a reliable one on one session between a client and server, with full duplex streams of data.

UDP is a user-level packet facility, without 'reliability' but with broadcast and mixed correspondent capability as well as a 'connection' facility, just a fd with a filter and default correspondent. For instance, DNS uses UDP, and a DNS server sits there receiving packets, and for every packet in, makes a packet out. The packet in may be a request for local data, a request for remote data or a response to a past inquiry sent by this server to other DNS servers. The server sends a response to the inquiry, or if tasked with recursion, an inquiry for the inquiry. For responses, the server sends them on to the requestor and caches them locally. The server does all this with one not-connected UDP socket.

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SS(8)							      System Manager's Manual							     SS(8)

ss - another utility to investigate sockets SYNOPSIS
ss [options] [ FILTER ] DESCRIPTION
ss is used to dump socket statistics. It allows showing information similar to netstat. It can display more TCP and state informations than other tools. OPTIONS
When no option is used ss displays a list of open non-listening TCP sockets that have established connection. -h, --help Show summary of options. -V, --version Output version information. -n, --numeric Do not try to resolve service names. -r, --resolve Try to resolve numeric address/ports. -a, --all Display both listening and non-listening (for TCP this means established connections) sockets. -l, --listening Display only listening sockets (these are omitted by default). -o, --options Show timer information. -e, --extended Show detailed socket information -m, --memory Show socket memory usage. -p, --processes Show process using socket. -i, --info Show internal TCP information. -s, --summary Print summary statistics. This option does not parse socket lists obtaining summary from various sources. It is useful when amount of sockets is so huge that parsing /proc/net/tcp is painful. -b, --bpf Show socket BPF filters (only administrators are allowed to get these information). -4, --ipv4 Display only IP version 4 sockets (alias for -f inet). -6, --ipv6 Display only IP version 6 sockets (alias for -f inet6). -0, --packet Display PACKET sockets (alias for -f link). -t, --tcp Display TCP sockets. -u, --udp Display UDP sockets. -d, --dccp Display DCCP sockets. -w, --raw Display RAW sockets. -x, --unix Display Unix domain sockets (alias for -f unix). -f FAMILY, --family=FAMILY Display sockets of type FAMILY. Currently the following families are supported: unix, inet, inet6, link, netlink. -A QUERY, --query=QUERY, --socket=QUERY List of socket tables to dump, separated by commas. The following identifiers are understood: all, inet, tcp, udp, raw, unix, packet, netlink, unix_dgram, unix_stream, packet_raw, packet_dgram. -D FILE, --diag=FILE Do not display anything, just dump raw information about TCP sockets to FILE after applying filters. If FILE is - stdout is used. -F FILE, --filter=FILE Read filter information from FILE. Each line of FILE is interpreted like single command line option. If FILE is - stdin is used. FILTER := [ state TCP-STATE ] [ EXPRESSION ] Please take a look at the official documentation (Debian package iproute-doc) for details regarding filters. USAGE EXAMPLES
ss -t -a Display all TCP sockets. ss -u -a Display all UDP sockets. ss -o state established '( dport = :ssh or sport = :ssh )' Display all established ssh connections. ss -x src /tmp/.X11-unix/* Find all local processes connected to X server. ss -o state fin-wait-1 '( sport = :http or sport = :https )' dst 193.233.7/24 List all the tcp sockets in state FIN-WAIT-1 for our apache to network 193.233.7/24 and look at their timers. SEE ALSO
ip(8), /usr/share/doc/iproute-doc-3.10.0/ (package iproute-doc) AUTHOR
ss was written by Alexey Kuznetosv, <>. This manual page was written by Michael Prokop <> for the Debian project (but may be used by others). SS(8)

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