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



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

SYNOPSIS
       #include <&lt;netdb.h>&gt;

       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 line from the file  /etc/pro-
       tocols  and  returns  a  structure  protoent  containing the broken out
       fields from the line.  The /etc/protocols file is opened if necessary.

       The getprotobyname() function returns a protoent structure for the line
       from /etc/protocols that matches the protocol name name.

       The  getprotobynumber()  function  returns a protoent structure for the
       line that matches the protocol number number.

       The setprotoent() function opens and rewinds the  /etc/protocols  file.
       If stayopen is true (1), then the file will not be closed between calls
       to getprotobyname() or getprotobynumber().

       The endprotoent() function closes /etc/protocols.

       The protoent structure is defined in &lt;netdb.h&gt; 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 zero terminated list of alternative names for the protocol.

       p_proto
              The protocol number.

RETURN VALUE
       The getprotoent(), getprotobyname()  and  getprotobynumber()  functions
       return  the 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), getservent(3), protocols(5)

COLOPHON
       This page is part of release 3.05 of the Linux  man-pages  project.   A
       description  of  the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.



GNU                               1993-04-24                    GETPROTOENT(3)