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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/pro-
       tocols  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)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | FILES | CONFORMING TO | SEE ALSO

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