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getprotobyname (3)
  • getprotobyname (3) ( Solaris man: Библиотечные вызовы )
  • >> getprotobyname (3) ( FreeBSD man: Библиотечные вызовы )
  • getprotobyname (3) ( Русские man: Библиотечные вызовы )
  • getprotobyname (3) ( Linux man: Библиотечные вызовы )
  • getprotobyname (3) ( POSIX man: Библиотечные вызовы )

  • BSD mandoc
     

    NAME

    
    
    getprotoent
    
     
    getprotobynumber
    
     
    getprotobyname
    
     
    setprotoent
    
     
    endprotoent
    
     - get protocol entry
    
     
    

    LIBRARY

    Lb libc
    
     
    

    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 (,);
    getprotobyname (,);
    and getprotobynumber ();
    functions each return a pointer to an object with the following structure containing the broken-out fields of a line in the network protocol data base, /etc/protocols

    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:

    Fa p_name
    The official name of the protocol.
    Fa p_aliases
    A zero terminated list of alternate names for the protocol.
    Fa 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 Fa 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.  

    RETURN VALUES

    Null pointer (0) returned on EOF or error.  

    FILES

    /etc/protocols

     

    SEE ALSO

    protocols(5)  

    HISTORY

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

    BUGS

    These functions use a thread-specific 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.


     

    Index

    NAME
    LIBRARY
    SYNOPSIS
    DESCRIPTION
    RETURN VALUES
    FILES
    SEE ALSO
    HISTORY
    BUGS


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