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  man pages->OpenBSD man pages -> getprotobyname (3)              



NAME    [Toc]    [Back]

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

SYNOPSIS    [Toc]    [Back]

     #include <netdb.h>

     struct protoent *

     struct protoent *
     getprotobyname(const char *name);

     struct protoent *
     getprotobynumber(int proto);

     setprotoent(int stayopen);


DESCRIPTION    [Toc]    [Back]

     The  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

           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

     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 database will not be closed  after
each call to
     getprotobyname() or getprotobynumber().

     The endprotoent() function closes the file.

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

RETURN VALUES    [Toc]    [Back]

     Null pointer (0) returned on EOF or error.

FILES    [Toc]    [Back]


SEE ALSO    [Toc]    [Back]


HISTORY    [Toc]    [Back]

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

BUGS    [Toc]    [Back]

     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.

OpenBSD      3.6                           June      4,      1993
[ Back ]
 Similar pages
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