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RocketLink!--> Man page versions: OpenBSD FreeBSD RedHat Others

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

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

     #include <netdb.h>

     struct protoent *

     struct protoent *
     getprotobyname(char *name);

     struct protoent *
     getprotobynumber(int proto);

     setprotoent(int stayopen);


     The getprotoent(), getprotobyname(), and getprotobynumber() functions
     each return a pointer to an object with the following structure contain-
     ing the broken-out fields of a line in the network protocol data base,

           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.

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

     The endprotoent() function closes the file.

     The getprotobyname() function 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.

     Null pointer (0) returned on EOF or error.



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

     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 2.6                      June 4, 1993                                2

Source: OpenBSD 2.6 man pages. Copyright: Portions are copyrighted by BERKELEY
SOFTWARE DESIGN, INC., The Regents of the University of California, Massachusetts
Institute of Technology, Free Software Foundation, FreeBSD Inc., and others.

(Corrections, notes, and links courtesy of RocketAware.com)

[Detailed Topics]
FreeBSD Sources for getprotoent(3) functions
OpenBSD sources for getprotoent(3)

[Overview Topics]

Up to: Host, service name, and address operations - Methods and functions for doing address, host, user, and service name lookups (DNS). also Internet Assigned Numbers

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