curs_getch.3x.html

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            KEY_MESSAGE     Message key
            KEY_MOUSE       Mouse event read
            KEY_MOVE        Move key
            KEY_NEXT        Next object key
            KEY_OPEN        Open key
            KEY_OPTIONS     Options key
            KEY_PREVIOUS    Previous object key
            KEY_REDO        Redo key
            KEY_REFERENCE   Ref(erence) key
            KEY_REFRESH     Refresh key
            KEY_REPLACE     Replace key
            KEY_RESIZE      Screen resized
            KEY_RESTART     Restart key
            KEY_RESUME      Resume key

            KEY_SAVE        Save key
            KEY_SBEG        Shifted beginning key
            KEY_SCANCEL     Shifted cancel key
            KEY_SCOMMAND    Shifted command key
            KEY_SCOPY       Shifted copy key
            KEY_SCREATE     Shifted create key
            KEY_SDC         Shifted delete char key
            KEY_SDL         Shifted delete line key
            KEY_SELECT      Select key
            KEY_SEND        Shifted end key
            KEY_SEOL        Shifted clear line key
            KEY_SEXIT       Shifted exit key
            KEY_SFIND       Shifted find key
            KEY_SHELP       Shifted help key
            KEY_SHOME       Shifted home key
            KEY_SIC         Shifted input key
            KEY_SLEFT       Shifted left arrow key
            KEY_SMESSAGE    Shifted message key
            KEY_SMOVE       Shifted move key
            KEY_SNEXT       Shifted next key
            KEY_SOPTIONS    Shifted options key
            KEY_SPREVIOUS   Shifted prev key
            KEY_SPRINT      Shifted print key
            KEY_SREDO       Shifted redo key
            KEY_SREPLACE    Shifted replace key
            KEY_SRIGHT      Shifted right arrow
            KEY_SRSUME      Shifted resume key
            KEY_SSAVE       Shifted save key
            KEY_SSUSPEND    Shifted suspend key
            KEY_SUNDO       Shifted undo key
            KEY_SUSPEND     Suspend key
            KEY_UNDO        Undo key

       Keypad is arranged like this:


                         +-----+------+-------+
                         | <STRONG>A1</STRONG>  |  <STRONG>up</STRONG>  |  <STRONG>A3</STRONG>   |
                         +-----+------+-------+
                         |<STRONG>left</STRONG> |  <STRONG>B2</STRONG>  | <STRONG>right</STRONG> |
                         +-----+------+-------+
                         | <STRONG>C1</STRONG>  | <STRONG>down</STRONG> |  <STRONG>C3</STRONG>   |
                         +-----+------+-------+
       The <STRONG>has_key</STRONG> routine takes a key value from the above list,
       and returns TRUE or FALSE according to whether the current
       terminal type recognizes a key with that value.  Note that
       a  few  values  do  not  correspond  to  a real key, e.g.,
       <STRONG>KEY_RESIZE</STRONG> and <STRONG>KEY_MOUSE</STRONG>.  See <STRONG><A HREF="resizeterm.3x.html">resizeterm(3x)</A></STRONG> for more de-
       tails  about  <STRONG>KEY_RESIZE</STRONG>, and <STRONG><A HREF="curs_mouse.3x.html">curs_mouse(3x)</A></STRONG> for a discus-
       sion of <STRONG>KEY_MOUSE</STRONG>.



</PRE>
<H2>RETURN VALUE</H2><PRE>
       All routines return the integer <STRONG>ERR</STRONG> upon  failure  and  an
       integer value other than <STRONG>ERR</STRONG> (<STRONG>OK</STRONG> in the case of ungetch())
       upon successful completion.

              <STRONG>ungetch</STRONG>
                   returns an error if there is no more  room  in
                   the FIFO.

              <STRONG>wgetch</STRONG>
                   returns  an  error  if  the  window pointer is
                   null, or if its timeout expires without having
                   any data.


</PRE>
<H2>NOTES</H2><PRE>
       Use of the escape key by a programmer for a single charac-
       ter function is discouraged, as it will cause a  delay  of
       up to one second while the keypad code looks for a follow-
       ing function-key sequence.

       Note that some keys may be the same as commonly used  con-
       trol keys, e.g., <STRONG>KEY_ENTER</STRONG> versus control/M, <STRONG>KEY_BACKSPACE</STRONG>
       versus control/H.  Some curses implementations may  differ
       according  to  whether  they treat these control keys spe-
       cially (and ignore the terminfo), or use the terminfo def-
       initions.   <STRONG>Ncurses</STRONG>  uses  the terminfo definition.  If it
       says  that  <STRONG>KEY_ENTER</STRONG>  is  control/M,  <STRONG>getch</STRONG>  will  return
       <STRONG>KEY_ENTER</STRONG> when you press control/M.

       When  using  <STRONG>getch</STRONG>, <STRONG>wgetch</STRONG>, <STRONG>mvgetch</STRONG>, or <STRONG>mvwgetch</STRONG>, nocbreak
       mode (<STRONG>nocbreak</STRONG>) and echo mode (<STRONG>echo</STRONG>) should not be used at
       the  same  time.  Depending on the state of the tty driver
       when each character is typed, the program may produce  un-
       desirable results.

       Note that <STRONG>getch</STRONG>, <STRONG>mvgetch</STRONG>, and <STRONG>mvwgetch</STRONG> may be macros.

       Historically, the set of keypad macros was largely defined
       by the extremely function-key-rich keyboard  of  the  AT&amp;T
       7300,  aka  3B1,  aka Safari 4.  Modern personal computers
       usually have only a small subset of these.   IBM  PC-style
       consoles   typically  support  little  more  than  <STRONG>KEY_UP</STRONG>,
       <STRONG>KEY_DOWN</STRONG>,   <STRONG>KEY_LEFT</STRONG>,   <STRONG>KEY_RIGHT</STRONG>,   <STRONG>KEY_HOME</STRONG>,    <STRONG>KEY_END</STRONG>,
       <STRONG>KEY_NPAGE</STRONG>, <STRONG>KEY_PPAGE</STRONG>, and function keys 1 through 12.  The
       Ins key is usually mapped to <STRONG>KEY_IC</STRONG>.


</PRE>
<H2>PORTABILITY</H2><PRE>
       The *get* functions are described in the XSI Curses  stan-
       dard,  Issue  4.   They  read single-byte characters only.
       The standard specifies that they return  <STRONG>ERR</STRONG>  on  failure,
       but specifies no error conditions.

       The  echo  behavior of these functions on input of <STRONG>KEY_</STRONG> or
       backspace characters was not specified in the  SVr4  docu-
       mentation.  This description is adopted from the XSI Curs-
       es standard.

       The behavior of <STRONG>getch</STRONG> and friends in the presence of  han-
       dled  signals  is  unspecified  in the SVr4 and XSI Curses
       documentation.  Under historical  curses  implementations,
       it  varied depending on whether the operating system's im-
       plementation  of  handled  signal  receipt  interrupts   a
       <STRONG><A HREF="read.2.html">read(2)</A></STRONG>  call in progress or not, and also (in some imple-
       mentations) depending on whether an input timeout or  non-
       blocking mode has been set.

       Programmers concerned about portability should be prepared
       for either of two cases: (a) signal receipt does  not  in-
       terrupt  <STRONG>getch</STRONG>;  (b)  signal  receipt interrupts <STRONG>getch</STRONG> and
       causes it to return ERR with <STRONG>errno</STRONG> set  to  <STRONG>EINTR</STRONG>.   Under
       the  <STRONG>ncurses</STRONG>  implementation, handled signals never inter-
       rupt <STRONG>getch</STRONG>.

       The <STRONG>has_key</STRONG> function is unique to <STRONG>ncurses</STRONG>.   We  recommend
       that  any  code  using it be conditionalized on the <STRONG>NCURS-</STRONG>
       <STRONG>ES_VERSION</STRONG> feature macro.


</PRE>
<H2>SEE ALSO</H2><PRE>
       <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>,        <STRONG><A HREF="curs_inopts.3x.html">curs_inopts(3x)</A></STRONG>,        <STRONG><A HREF="curs_mouse.3x.html">curs_mouse(3x)</A></STRONG>,
       <STRONG><A HREF="curs_move.3x.html">curs_move(3x)</A></STRONG>, <STRONG><A HREF="curs_refresh.3x.html">curs_refresh(3x)</A></STRONG>, <STRONG><A HREF="resizeterm.3x.html">resizeterm(3x)</A></STRONG>.



                                                         <STRONG><A HREF="curs_getch.3x.html">curs_getch(3x)</A></STRONG>
</PRE>
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