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isnettty (3)
  • >> isnettty (3) ( FreeBSD man: Библиотечные вызовы )

  • BSD mandoc
     

    NAME

    
    
    getttyent
    
     
    getttynam
    
     
    setttyent
    
     
    endttyent
    
     
    isdialuptty
    
     
    isnettty
    
     - ttys(5)
    
    
    
    file routines
     
    

    LIBRARY

    Lb libc
    
     
    

    SYNOPSIS

       #include <ttyent.h>
    struct ttyent * getttyent (void);
    struct ttyent * getttynam (const char *name);
    int setttyent (void);
    int endttyent (void);
    int isdialuptty (const char *name);
    int isnettty (const char *name);
     

    DESCRIPTION

    The getttyent (,);
    and getttynam ();
    functions each return a pointer to an object, with the following structure, containing the broken-out fields of a line from the tty description file.
    struct ttyent {
            char    *ty_name;       /* terminal device name */
            char    *ty_getty;      /* command to execute, usually getty */
            char    *ty_type;       /* terminal type for termcap */
    #define TTY_ON          0x01    /* enable logins (start ty_getty program) */
    #define TTY_SECURE      0x02    /* allow uid of 0 to login */
    #define TTY_DIALUP      0x04    /* is a dialup tty */
    #define TTY_NETWORK     0x08    /* is a network tty */
            int     ty_status;      /* status flags */
            char    *ty_window;     /* command to start up window manager */
            char    *ty_comment;    /* comment field */
            char    *ty_group;      /* tty group name */
    };
    

    The fields are as follows:

    Fa ty_name
    The name of the character-special file.
    Fa ty_getty
    The name of the command invoked by init(8) to initialize tty line characteristics.
    Fa ty_type
    The name of the default terminal type connected to this tty line.
    Fa ty_status
    A mask of bit fields which indicate various actions allowed on this tty line. The possible flags are as follows:

    TTY_ON
    Enables logins (i.e., init(8) will start the command referenced by Fa ty_getty on this entry).
    TTY_SECURE
    Allow users with a uid of 0 to login on this terminal.
    TTY_DIALUP
    Identifies a tty as a dialin line. If this flag is set, then isdialuptty ();
    will return a non-zero value.
    TTY_NETWORK
    Identifies a tty used for network connections. If this flag is set, then isnettty ();
    will return a non-zero value.

    Fa ty_window
    The command to execute for a window system associated with the line.
    Fa ty_group
    A group name to which the tty belongs. If no group is specified in the ttys description file, then the tty is placed in an anonymous group called "none".
    Fa ty_comment
    Any trailing comment field, with any leading hash marks (``#'') or whitespace removed.

    If any of the fields pointing to character strings are unspecified, they are returned as null pointers. The field Fa ty_status will be zero if no flag values are specified.

    See ttys(5) for a more complete discussion of the meaning and usage of the fields.

    The getttyent ();
    function reads the next line from the ttys file, opening the file if necessary. The setttyent ();
    function rewinds the file if open, or opens the file if it is unopened. The endttyent ();
    function closes any open files.

    The getttynam ();
    function searches from the beginning of the file until a matching Fa name is found (or until EOF is encountered).  

    RETURN VALUES

    The routines getttyent ();
    and getttynam ();
    return a null pointer on EOF or error. The setttyent ();
    function and endttyent ();
    return 0 on failure and 1 on success.

    The routines isdialuptty ();
    and isnettty ();
    return non-zero if the dialup or network flag is set for the tty entry relating to the tty named by the argument, and zero otherwise.  

    FILES

    /etc/ttys

     

    SEE ALSO

    login(1), ttyslot(3), gettytab(5), termcap(5), ttys(5), getty(8), init(8)  

    HISTORY

    The getttyent (,);
    getttynam (,);
    setttyent (,);
    and endttyent ();
    functions appeared in BSD 4.3  

    BUGS

    These functions use static data storage; if the data is needed for future use, it should be copied before any subsequent calls overwrite it.


     

    Index

    NAME
    LIBRARY
    SYNOPSIS
    DESCRIPTION
    RETURN VALUES
    FILES
    SEE ALSO
    HISTORY
    BUGS


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