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



NAME
       getprotoent, getprotobyname, getprotobynumber, setprotoent, endprotoent - get protocol 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  get-
       proto*() 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  informa-
       tion about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



GNU                               2008-08-19                    GETPROTOENT(3)