getprotoent(3N)                                   getprotoent(3N)



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

     SYNOPSIS
          #include <netdb.h>

          struct protoent *getprotoent()

          struct protoent *getprotobyname(name)
          char *name;

          struct protoent *getprotobynumber(proto)
          int proto;

          setprotoent(stayopen)
          int stayopen

          endprotoent()

          cc ... -lnet

     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 */
                 long   p_proto;      /* protocol number */
          };

          The members of this structure are:

          pname     The official name of the protocol.

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

          pproto    The protocol number.

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

          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 getprotoent  (either  directly,  or  indirectly
          through one of the other ``getproto'' calls).

          endprotoent closes the file.



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     getprotoent(3N)                                   getprotoent(3N)



          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

     LINKING
          This library is accessed by specifying  -lnet  as  the  last
          argument to the compile line, e.g.:

            cc -o prog prog.c -lnet

     SEE ALSO
          protocols(4N).

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

     BUGS
          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.
































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