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GETPROTOENT(3)             Linux Programmer's Manual            GETPROTOENT(3)



NAME
       getprotoent,  getprotobyname, getprotobynumber, setprotoent, endprotoent - get pro-
       tocol entry

SYNOPSIS
       #include <netdb.h>

       struct protoent *getprotoent(void);

       struct protoent *getprotobyname(const char *name);

       struct protoent *getprotobynumber(int proto);

       void setprotoent(int stayopen);

       void endprotoent(void);

DESCRIPTION
       The getprotoent() function reads the next entry from the  protocols  database  (see
       protocols(5))  and  returns  a  protoent structure containing the broken-out fields
       from the entry.  A connection is opened to the database if necessary.

       The getprotobyname() function returns a protoent structure for the entry  from  the
       database  that  matches  the  protocol  name  name.   A connection is opened to the
       database if necessary.

       The getprotobynumber() function returns a protoent structure for the entry from the
       database  that  matches  the protocol number number.  A connection is opened to the
       database if necessary.

       The setprotoent() function opens a connection to the database, and  sets  the  next
       entry  to  the  first  entry.   If stayopen is non-zero, then the connection to the
       database will not be closed between calls to one of the getproto*() functions.

       The endprotoent() function closes the connection to the database.

       The protoent structure is defined in <netdb.h> as follows:

           struct protoent {
               char  *p_name;       /* official protocol name */
               char **p_aliases;    /* alias list */
               int    p_proto;      /* protocol number */
           }

       The members of the protoent structure are:

       p_name The official name of the protocol.

       p_aliases
              A NULL-terminated list of alternative names for the protocol.

       p_proto
              The protocol number.

RETURN VALUE
       The getprotoent(),  getprotobyname()  and  getprotobynumber()  functions  return  a
       pointer to a statically allocated protoent structure, or a NULL pointer if an error
       occurs or the end of the file is reached.

FILES
       /etc/protocols
              protocol database file

CONFORMING TO
       4.3BSD, POSIX.1-2001.

SEE ALSO
       getnetent(3), getprotent_r(3), getservent(3), protocols(5)

COLOPHON
       This page is part of release 3.22 of the Linux man-pages project.  A description of
       the  project, and information about reporting bugs, can be found at http://www.ker-
       nel.org/doc/man-pages/.



GNU                               2008-08-19                    GETPROTOENT(3)

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