protocols(4) [opensolaris man page]

protocols(4)							   File Formats 						      protocols(4)

NAME

       protocols - protocol name database

SYNOPSIS

       /etc/inet/protocols

       /etc/protocols

DESCRIPTION

       The  protocols  file   is a local source of information regarding the known protocols used in the DARPA Internet. The protocols file can be
       used in conjunction with or instead of other protocols sources, including the NIS maps ``protcols.byname'' and "protocols.bynumber" and the
       NIS+ table ``protocols''. Programs use the getprotobyname(3SOCKET) routine to access this information.

       The protocols file has one line for each protocol. The line has the following format:

	 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.

EXAMPLES

       Example 1 A Sample Database

       The following is a sample database:

	 #
	 # Internet (IP) protocols
	 #
	 ip	     0	 IP	     # internet protocol, pseudo protocol number
	 icmp	     1	 ICMP	     # internet control message 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

	 #
	 # Internet (IPv6) extension headers
	 #
	 hopopt      0	 HOPOPT      # Hop-by-hop options for IPv6
	 ipv6	     41  IPv6	     # IPv6 in IP encapsulation
	 ipv6-route  43  IPv6-Route  # Routing header for IPv6
	 ipv6-frag   44  IPv6-Frag   # Fragment header for IPv6
	 esp	     50  ESP	     # Encap Security Payload for IPv6
	 ah	     51  AH	     # Authentication Header for IPv6
	 ipv6-icmp   58  IPv6-ICMP   # IPv6 internet control message protocol
	 ipv6-nonxt  59  IPv6-NoNxt  # No next header extension header for IPv6
	 ipv6-opts   60  IPv6-Opts   # Destination Options for IPv6

FILES

       /etc/nsswitch.conf    configuration file for name-service switch

SEE ALSO

       getprotobyname(3SOCKET), nsswitch.conf(4)

NOTES

       /etc/inet/protocols is the official SVR4 name of the protocols file.  The symbolic link /etc/protocols exists for BSD compatibility.

SunOS 5.11							    13 Jun 2002 						      protocols(4)

Check Out this Related Man Page

GETPROTOENT(3)						     Linux Programmer's Manual						    GETPROTOENT(3)

NAME

       getprotoent, getprotobyname, getprotobynumber, setprotoent, endprotoent - get protocol entry

SYNOPSIS

       #include <netdb.h>

       struct protoent *getprotoent(void);

       struct protoent *getprotobyname(const char *name);

       struct protoent *getprotobynumber(int proto);

       void setprotoent(int stayopen);

       void endprotoent(void);

DESCRIPTION

       The  getprotoent()  function  reads  the  next line from the file /etc/protocols and returns a structure protoent containing the broken out
       fields from the line.  The /etc/protocols file is opened if necessary.

       The getprotobyname() function returns a protoent structure for the line from /etc/protocols that matches the protocol name name.

       The getprotobynumber() function returns a protoent structure for the line that matches the protocol number number.

       The setprotoent() function opens and rewinds the /etc/protocols file.  If stayopen is true (1), then the file will not  be  closed  between
       calls to getprotobyname() or getprotobynumber().

       The endprotoent() function closes /etc/protocols.

       The protoent structure is defined in <netdb.h> as follows:

	      struct protoent {
		      char    *p_name;	      /* official protocol name */
		      char    **p_aliases;    /* alias list */
		      int     p_proto;	      /* protocol number */
	      }

       The members of the protoent structure are:

       p_name The official name of the protocol.

       p_aliases
	      A zero terminated list of alternative names for the protocol.

       p_proto
	      The protocol number.

RETURN VALUE

       The getprotoent(), getprotobyname() and getprotobynumber() functions return the protoent structure, or a NULL pointer if an error occurs or
       the end of the file is reached.

FILES

       /etc/protocols
	      protocol database file

CONFORMING TO

       BSD 4.3

SEE ALSO

       getservent(3), getnetent(3), protocols(5)

BSD
								    1993-04-24							    GETPROTOENT(3)

Linux and UNIX Man Pages

protocols(4) [opensolaris man page]

Check Out this Related Man Page