getprotoent man page on 4.4BSD

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GETPROTOENT(3)		 BSD Library Functions Manual		GETPROTOENT(3)

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

     #include <netdb.h>

     struct protoent *

     struct protoent *
     getprotobyname(char *name);

     struct protoent *
     getprotobynumber(int proto);

     setprotoent(int stayopen);


     The getprotoent(), getprotobyname(), and getprotobynumber() functions
     each return a pointer to an object with the following structure contain‐
     ing the broken-out fields of a line in the network protocol data base,

	   struct  protoent {
		   char	   *p_name;	   /* official name of protocol */
		   char	   **p_aliases;	   /* alias list */
		   int	   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.

     The getprotoent() function reads the next line of the file, opening the
     file if necessary.

     The setprotoent() function opens and rewinds the file.  If the stayopen
     flag is non-zero, the net data base will not be closed after each call to
     getprotobyname() or getprotobynumber().

     The endprotoent() function closes the file.

     The getprotobyname() function and getprotobynumber() sequentially search
     from the beginning of the file until a matching protocol name or protocol
     number is found, or until EOF is encountered.

     Null pointer (0) returned on EOF or error.



     The getprotoent(), getprotobynumber(), getprotobyname(), setprotoent(),
     and endprotoent() functions appeared in 4.2BSD.

     These functions use a static data space; if the data is needed for future
     use, it should be copied before any subsequent calls overwrite it.	 Only
     the Internet protocols are currently understood.

4.2 Berkeley Distribution	 June 4, 1993	     4.2 Berkeley Distribution

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