getprotobynumber man page on Ultrix

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getprotoent(3n)						       getprotoent(3n)

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

       #include <netdb.h>

       struct protoent *getprotoent()

       struct protoent *getprotobyname(name)
       char *name;

       struct protoent *getprotobynumber(proto)
       int proto;

       void setprotoent(stayopen)
       int stayopen;

       void endprotoent()

       The and subroutines each return a pointer to an object with the follow‐
       ing  structure  containing the broken-out fields of a line in the data‐
       struct	 protoent {
	    char *p_name;  /* official name of protocol */
	    char **p_aliases;	/* alias list */
	    long p_proto;  /* protocol number */

       The members of this structure are:

       p_name	  The official name of the protocol.

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

       p_proto	  The protocol number.

       If the stayopen flag on a subroutine is NULL, the protocols database is
       opened.	 Otherwise the has the effect of rewinding the protocols data‐
       base.  The may be called to close the protocols database when  process‐
       ing is complete.

       The  subroutine	simply	reads  the  next line while and search until a
       matching name or proto number is found (or until EOF  is	 encountered).
       The  subroutine	keeps  a  pointer in the database, allowing successive
       calls to be used to search the entire file.

       A call to must be made before a loop using in order to perform initial‐
       ization and an must be used after the loop.  Both and make calls to and

       All  information	 is contained in a static area so it must be copied if
       it is to be saved.  Only the Internet protocols	are  currently	under‐

       If  YP is running, does not return the entries in any particular order.
       See the Guide to the Yellow Pages Service for setup information.

       The services database may also be  distributed  using  the  BIND/Hesiod
       naming  service.	  See  the  Guide  to the BIND/Hesiod Service for more

Return Values
       Null pointer (0) returned on EOF or error.

See Also
       protocols(5), svc.conf(5)
       Guide to the BIND/Hesiod Service
       Guide to the Yellow Pages Service


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