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Интерактивная система просмотра системных руководств (man-ов)

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

  • BSD mandoc
     

    NAME

    
    
    getservent
    
     
    getservbyport
    
     
    getservbyname
    
     
    setservent
    
     
    endservent
    
     - get service entry
    
     
    

    LIBRARY

    Lb libc
    
     
    

    SYNOPSIS

       #include <netdb.h>
    struct servent * getservent ();
    struct servent * getservbyname (const char *name const char *proto);
    struct servent * getservbyport (int port const char *proto);
    void setservent (int stayopen);
    void endservent (void);
     

    DESCRIPTION

    The getservent (,);
    getservbyname (,);
    and getservbyport ();
    functions each return a pointer to an object with the following structure containing the broken-out fields of a line in the network services data base, /etc/services
    struct  servent {
            char    *s_name;        /* official name of service */
            char    **s_aliases;    /* alias list */
            int     s_port;         /* port service resides at */
            char    *s_proto;       /* protocol to use */
    };
    

    The members of this structure are:

    Fa s_name
    The official name of the service.
    Fa s_aliases
    A zero terminated list of alternate names for the service.
    Fa s_port
    The port number at which the service resides. Port numbers are returned in network byte order.
    Fa s_proto
    The name of the protocol to use when contacting the service.

    The getservent ();
    function reads the next line of the file, opening the file if necessary.

    The setservent ();
    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 getservbyname ();
    or getservbyport (.);

    The endservent ();
    function closes the file.

    The getservbyname ();
    and getservbyport ();
    functions sequentially search from the beginning of the file until a matching protocol name or port number (which must be specified in network byte order) is found, or until EOF is encountered. If a protocol name is also supplied (non- NULL ) searches must also match the protocol.  

    FILES

    /etc/services

     

    DIAGNOSTICS

    Null pointer (0) returned on EOF or error.  

    SEE ALSO

    getprotoent(3), services(5)  

    HISTORY

    The getservent (,);
    getservbyport (,);
    getservbyname (,);
    setservent (,);
    and endservent ();
    functions appeared in BSD 4.2  

    BUGS

    These functions use a thread-specific data storage; if the data is needed for future use, it should be copied before any subsequent calls overwrite it. Expecting port numbers to fit in a 32 bit quantity is probably naive.


     

    Index

    NAME
    LIBRARY
    SYNOPSIS
    DESCRIPTION
    FILES
    DIAGNOSTICS
    SEE ALSO
    HISTORY
    BUGS


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