SOCK_STREAM
Provides sequenced, reliable, two-way, connection-based byte
streams. An out-of-band data transmission mechanism may be sup-
ported. (потоковый сокет)
SOCK_DGRAM
Supports datagrams (connectionless, unreliable messages of a
fixed maximum length). (датаграммный сокет)
SOCK_SEQPACKET
Provides a sequenced, reliable, two-way connection-based data
transmission path for datagrams of fixed maximum length; a con-
sumer is required to read an entire packet with each read system
call. (надёжная служба последовательных пакетов)
SOCK_RAW
Provides raw network protocol access.
SOCK_RDM
Provides a reliable datagram layer that does not guarantee
ordering.
SOCK_PACKET
Obsolete and should not be used in new programs; see packet(7).
Basically SOCK_DGRAM is used for UDP packets, SOCK_STREAM for TCP
Указатели протоколов создаваемого сокета
These constants represent the address (and protocol) families, used for the first argument to socket():
socket.AF_UNIX - локальных сокетов (адрес определяется как строка, содержащая путь в файловой системе /etc/tmp).
socket.AF_INET - для сетевого протокола IPv4 или
socket.AF_INET6 - для сетевого протокола IPv6
If the AF_UNIX constant is not defined then this protocol is unsupported.
unix, AF_UNIX, AF_LOCAL - Sockets for local interprocess communication
The difference is that an INET socket is bound to an IP address, while a UNIX socket is "bound" to a special file on your filesystem -- only processes having access to that filesystem (i.e. running on the same machine) can communicate through the latter.
http://manpages.ubuntu.com/manpages/lucid/man7/unix.7.html
http://unixhelp.ed.ac.uk/CGI/man-cgi?socket+2
Provides sequenced, reliable, two-way, connection-based byte
streams. An out-of-band data transmission mechanism may be sup-
ported. (потоковый сокет)
SOCK_DGRAM
Supports datagrams (connectionless, unreliable messages of a
fixed maximum length). (датаграммный сокет)
SOCK_SEQPACKET
Provides a sequenced, reliable, two-way connection-based data
transmission path for datagrams of fixed maximum length; a con-
sumer is required to read an entire packet with each read system
call. (надёжная служба последовательных пакетов)
SOCK_RAW
Provides raw network protocol access.
SOCK_RDM
Provides a reliable datagram layer that does not guarantee
ordering.
SOCK_PACKET
Obsolete and should not be used in new programs; see packet(7).
Basically SOCK_DGRAM is used for UDP packets, SOCK_STREAM for TCP
Указатели протоколов создаваемого сокета
These constants represent the address (and protocol) families, used for the first argument to socket():
socket.AF_UNIX - локальных сокетов (адрес определяется как строка, содержащая путь в файловой системе /etc/tmp).
socket.AF_INET - для сетевого протокола IPv4 или
socket.AF_INET6 - для сетевого протокола IPv6
If the AF_UNIX constant is not defined then this protocol is unsupported.
unix, AF_UNIX, AF_LOCAL - Sockets for local interprocess communication
The difference is that an INET socket is bound to an IP address, while a UNIX socket is "bound" to a special file on your filesystem -- only processes having access to that filesystem (i.e. running on the same machine) can communicate through the latter.
http://manpages.ubuntu.com/manpages/lucid/man7/unix.7.html
http://unixhelp.ed.ac.uk/CGI/man-cgi?socket+2