protocols(5) [mojave man page]

PROTOCOLS(5)						      BSD File Formats Manual						      PROTOCOLS(5)

NAME

     protocols -- protocol name data base

DESCRIPTION

     The protocols file contains information regarding the known protocols used in the DARPA Internet.	For each protocol a single line should be
     present with the following information:

	   official protocol name
	   protocol number
	   aliases

     Items are separated by any number of blanks and/or tab characters.  A ``#'' indicates the beginning of a comment; characters up to the end of
     the line are not interpreted by routines which search the file.

     Protocol names may contain any printable character other than a field delimiter, newline, or comment character.

INTERACTION WITH DIRECTORY SERVICES

     Processes generally find protocol records using one of the getprotoent(3) family of functions.  On Mac OS X, these functions interact with
     the DirectoryService(8) daemon, which reads the /etc/protocols file as well as searching other directory information services to determine
     protocol name and number information.

FILES

     /etc/protocols

SEE ALSO

     getprotoent(3), DirectoryService(8)

HISTORY

     The protocols file format appeared in 4.2BSD.

4.2 Berkeley Distribution					   June 5, 1993 					 4.2 Berkeley Distribution

protocols(4)						     Kernel Interfaces Manual						      protocols(4)

NAME

       protocols - Defines the Internet protocols used on the local host

SYNOPSIS

       /etc/protocols

DESCRIPTION

       The /etc/protocols file contains information about the known protocols used in the DARPA (Defense Advanced Research Projects Agency) Inter-
       net.  Each protocol is represented by a single line in the protocols file.  Each entry is of the form: Name Number Aliases

       The fields contain the following information: Official Internet protocol name.  Protocol number.  Unofficial names used for the protocol.

       Items on a line are separated by one or more spaces or tab characters.  Comments begin with the # (number sign), and routines  that  search
       the  protocols  file  do  not interpret characters from the beginning of a comment to the end of the line.  A protocol name can contain any
       printable character except a field delimiter, newline character, or comment character.

       The lines in the file appear as follows: # # Internet (IP) protocols # ip      0    IP	      # internet protocol, pseudo protocol  number
       icmp	1     ICMP	 # internet control message protocol igmp    2	  IGMP	     # internet group management protocol ggp	  3    GGP
       # gateway-gateway protocol tcp	  6    TCP	  # transmission control protocol egp	  8    EGP	  # exterior gateway protocol  pup
       12   PUP        # PARC universal packet protocol udp	17   UDP	# user datagram protocol hmp	 20   HMP	 # host monitoring
       protocol rdp	27   RDP	# "reliable datagram" protocol

RELATED INFORMATION

       Functions: endprotoent(3), getprotobyname(3), getprotobynumber(3), getprotoent(3), setprotoent(3) delim off

																      protocols(4)