GETPROTOENT(3N-BSD) RISC/os Reference Manual  GETPROTOENT(3N-BSD)



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

SYNOPSIS
   Headers
     For -systype svr3:

     #include <bsd/sys/types.h>
     #include <bsd/netdb.h>

     For -systype bsd43:

     #include <netdb.h>

   Declarations
     struct protoent *getprotoent()

     struct protoent *getprotobyname(name)
     char *name;

     struct protoent *getprotobynumber(proto)
     int proto;

     setprotoent(stayopen)
     int stayopen

     endprotoent()

DESCRIPTION
     getprotoent, getprotobyname, and getprotobynumber each
     return a pointer to an object with the following structure
     containing the broken-out fields of a line in the network
     protocol data base, /etc/protocols.

          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.

     getprotoent reads the next line of the file, opening the
     file if necessary.



                        Printed 11/19/92                   Page 1

GETPROTOENT(3N-BSD) RISC/os Reference Manual  GETPROTOENT(3N-BSD)



     setprotoent 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.

     endprotoent closes the file.

     getprotobyname 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.

FILES
     /etc/protocols

SEE ALSO
     protocols(4)

DIAGNOSTICS
     Null pointer (0) returned on EOF or error.

ERRORS
     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 understood.

NOTE
     When these routines are used in a program which is compiled
     in -systype svr3, they are not resolved by libc.a.  See
     intro(3) for more information.



























 Page 2                 Printed 11/19/92