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Linux 2.6 - man page for getprotobyname (linux section 3)

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 entry from the protocols  database  (see  proto-
       cols(5)) and returns a protoent structure containing the broken-out fields from the entry.
       A connection is opened to the database if necessary.

       The getprotobyname() function returns a protoent structure for the entry from the database
       that matches the protocol name name.  A connection is opened to the database if necessary.

       The  getprotobynumber() function returns a protoent structure for the entry from the data-
       base that matches the protocol number number.  A connection is opened to the  database  if
       necessary.

       The  setprotoent() function opens a connection to the database, and sets the next entry to
       the first entry.  If stayopen is nonzero, then the connection to the database will not  be
       closed between calls to one of the getproto*() functions.

       The endprotoent() function closes the connection to the database.

       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 NULL-terminated list of alternative names for the protocol.

       p_proto
	      The protocol number.

RETURN VALUE
       The getprotoent(), getprotobyname() and getprotobynumber() functions return a pointer to a
       statically allocated 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
       4.3BSD, POSIX.1-2001.

SEE ALSO
       getnetent(3), getprotoent_r(3), getservent(3), protocols(5)

COLOPHON
       This  page  is  part of release 3.55 of the Linux man-pages project.  A description of the
       project,    and	  information	 about	  reporting    bugs,	can    be    found     at
       http://www.kernel.org/doc/man-pages/.

GNU					    2008-08-19				   GETPROTOENT(3)


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