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NetBSD 6.1.5 - man page for timeout (netbsd section 3)

CURSES_INPUT(3) 		   BSD Library Functions Manual 		  CURSES_INPUT(3)

NAME
     curses_input, getch, wgetch, mvgetch, mvwgetch, define_key, keyok, getnstr, wgetnstr,
     mvgetnstr, mvwgetnstr, getstr, wgetstr, mvgetstr, mvwgetstr, keypad, notimeout, timeout,
     wtimeout, nodelay, ungetch -- curses input stream routines

LIBRARY
     Curses Library (libcurses, -lcurses)

SYNOPSIS
     #include <curses.h>

     int
     getch(void);

     int
     wgetch(WINDOW *win);

     int
     mvgetch(int y, int x);

     int
     mvwgetch(WINDOW *win, int y, int x);

     int
     keyok(int key_symbol, bool flag);

     int
     define_key(char *sequence, int key_symbol);

     int
     getnstr(char *str, int limit);

     int
     wgetnstr(WINDOW *win, char *str, int limit);

     int
     mvgetnstr(int y, int x, char *str, int limit);

     int
     mvwgetnstr(WINDOW *win, int y, int x, char *str, int limit);

     int
     getstr(char *str);

     int
     wgetstr(WINDOW *win, char *str);

     int
     mvgetstr(int y, int x, char *str);

     int
     mvwgetstr(WINDOW *win, int y, int x, char *str);

     int
     keypad(WINDOW *win, boolf flag);

     int
     notimeout(WINDOW *win, boolf flag);

     int
     timeout(int delay);

     int
     wtimeout(WINDOW *win, int delay);

     int
     nodelay(WINDOW *win, boolf flag);

     int
     ungetch(int c);

     extern int ESCDELAY;

DESCRIPTION
     These functions read characters and strings from the window input file descriptor.

     The getch() function reads a character from the stdscr input file descriptor and returns it.
     If the keypad() flag has been set to TRUE, then getch() will assemble multi-character key
     sequences into key symbols, If the terminal is resized, getch() will return KEY_RESIZE,
     regardless of the setting of keypad().  Calling getch() will cause an implicit refresh() on
     stdscr.

     The wgetch() function is the same as the getch() function, excepting that it reads from the
     input file descriptor associated with the window specified by win.

     If the keypad() flag is TRUE then the assembly of specific key symbols can be disabled by
     using the keyok() function.  If the flag is set to FALSE on a key symbol then getch() will
     behave as if the character sequence associated with that key symbol was not recognised and
     will return the component characters one at a time to the caller.

     Custom associations between sequences of characters and a key symbol can be made by using
     the define_key() function.  Normally, these associations are made by the information in the
     termcap(5) database but the define_key() function gives the capability to remove or add more
     associations.  If define_key() is passed a non-NULL string in sequence it will associate
     that sequence with the key symbol passed in key_symbol.  The key symbol may be one of the
     ones listed below or a custom value that is application defined.  It is valid to have multi-
     ple character sequences map to the same key symbol and there are no constraints on the
     length of the sequence allowed.  The assembly of custom sequences follow the same rules for
     inter-character timing and so forth as the termcap(5) derived ones.  If define_key() is
     passed a NULL in sequence then all associations for the key symbol in key_symbol will be
     deleted, this includes any associations that were derived from termcap(5).

     The mvgetch() and mvwgetch() functions are the same as the getch() and wgetch() functions,
     respectively, excepting that wmove() is called to move the cursor to the position specified
     by y, x before the character is read.

     Calling getnstr(), wgetnstr(), mvgetnstr() or mvwgetnstr() is effectively the same as call-
     ing getch() repeatedly until a newline is received or the character limit limit is reached.
     Once this happens the string is NULL terminated and returned in str.  During input, the nor-
     mal curses input key processing is performed and affects the input buffer.  The mvgetnstr()
     function calls wmove() to move the cursor to the position given by y, x before getting the
     string, wgetnstr() reads the input from the designated window, mvwgetnstr() moves the cursor
     to the position given by y, x before getting the input from the designated window.

     The functions getstr(), wgetstr(), mvgetstr(), and mvwgetstr() are similar to getnstr(),
     wgetnstr(), mvgetnstr(), and mvwgetnstr(), respectively, excepting that there is no limit on
     the number of characters that may be inserted into str.  This may cause the buffer to be
     overflowed, so their use is not recommended.

     The keypad() function is used to affect how getch() processes input characters.  If flag is
     set to TRUE, then getch() will scan the input stream looking for multi-character key
     sequences that are emitted by some terminal function keys.  If a recognised sequence of
     characters is found, then getch() will collapse that sequence into an integer key symbol, as
     shown below.  The default setting for the flag is FALSE.

     The notimeout() function controls whether or not getch() will wait indefinitely between
     characters in a multi-character key sequence or not.  If flag is TRUE, then there is no
     timeout applied between characters comprising a multi-character key sequence.  If flag is
     FALSE, then the component characters of a multi-character sequence must not have an inter-
     character gap of more than ESCDELAY.  If this timing is exceeded, then the multi-character
     key assembly is deemed to have failed and the characters read thus far are returned one at a
     time when getch() is called.  The default setting for the flag is FALSE.  The default value
     of ESCDELAY is 300ms.  If ESCDELAY is negative, no timeout is applied between characters
     comprising a multi-character key sequence.

     The timeout() function affects the behaviour of getch() when reading a character from
     stdscr.  If delay is negative, then getch() will block indefinitely on a read.  If delay is
     0, then getch() will return immediately with ERR if there are no characters immediately
     available.  If delay is a positive number, then getch() will wait for that many milliseconds
     before returning and, if no character was available, then ERR will be returned.  Note that
     for a positive number, the timeout is only accurate to the nearest tenth of a second.  Also,
     the maximum value of delay is 25500 milliseconds.	The wtimeout() function does the same as
     timeout() but applies to the specified window win.

     The nodelay() function turns on and off blocking reads for getch().  If flag is TRUE, then
     getch() will not block on reads, if flag is FALSE, then reads will block.	The default set-
     ting for the flag is FALSE.  nodelay(win, TRUE) is equivalent to wtimeout(win, 0) and
     nodelay(win, FALSE) is equivalent to wtimeout(win, -1).

     ungetch() will convert c into an unsigned char and push that character back onto the input
     stream.  Only one character of push-back is guaranteed to work, more may be possible depend-
     ing on system resources.

RETURN VALUES
     The functions getch(), wgetch(), mvgetch(), and mvwgetch() will return the value of the key
     pressed or ERR in the case of an error or a timeout.  Additionally, if keypad(TRUE) has been
     called on a window, then it may return one of the following values:

	   Termcap entry    getch Return Value	  Key Function
	   !1		    KEY_SSAVE		  Shift Save
	   !2		    KEY_SSUSPEND	  Shift Suspend
	   !3		    KEY_SUNDO		  Shift Undo
	   #1		    KEY_SHELP		  Shift Help
	   #2		    KEY_SHOME		  Shift Home
	   #3		    KEY_SIC		  Shift Insert Character
	   #4		    KEY_SLEFT		  Shift Left Arrow
	   %0		    KEY_REDO		  Redo
	   %1		    KEY_HELP		  Help
	   %2		    KEY_MARK		  Mark
	   %3		    KEY_MESSAGE 	  Message
	   %4		    KEY_MOVE		  Move
	   %5		    KEY_NEXT		  Next Object
	   %6		    KEY_OPEN		  Open
	   %7		    KEY_OPTIONS 	  Options
	   %8		    KEY_PREVIOUS	  Previous Object
	   %9		    KEY_PRINT		  Print
	   %a		    KEY_SMESSAGE	  Shift Message
	   %b		    KEY_SMOVE		  Shift Move
	   %c		    KEY_SNEXT		  Shift Next Object
	   %d		    KEY_SOPTIONS	  Shift Options
	   %e		    KEY_SPREVIOUS	  Shift Previous Object
	   %f		    KEY_SPRINT		  Shift Print
	   %g		    KEY_SREDO		  Shift Redo
	   %h		    KEY_SREPLACE	  Shift Replace
	   %i		    KEY_SRIGHT		  Shift Right Arrow
	   %j		    KEY_SRSUME		  Shift Resume
	   &0		    KEY_SCANCEL 	  Shift Cancel
	   &1		    KEY_REFERENCE	  Reference
	   &2		    KEY_REFRESH 	  Refresh
	   &3		    KEY_REPLACE 	  Replace
	   &4		    KEY_RESTART 	  Restart
	   &5		    KEY_RESUME		  Resume
	   &6		    KEY_SAVE		  Save
	   &7		    KEY_SUSPEND 	  Suspend
	   &8		    KEY_UNDO		  Undo
	   &9		    KEY_SBEG		  Shift Begin
	   *0		    KEY_SFIND		  Shift Find
	   *1		    KEY_SCOMMAND	  Shift Command
	   *2		    KEY_SCOPY		  Shift Copy
	   *3		    KEY_SCREATE 	  Shift Create
	   *4		    KEY_SDC		  Shift Delete Character
	   *5		    KEY_SDL		  Shift Delete Line
	   *6		    KEY_SELECT		  Select
	   *7		    KEY_SEND		  Shift End
	   *8		    KEY_SEOL		  Shift Clear to EOL
	   *9		    KEY_SEXIT		  Shift Exit
	   @0		    KEY_FIND		  Find
	   @1		    KEY_BEG		  Begin
	   @2		    KEY_CANCEL		  Cancel
	   @3		    KEY_CLOSE		  Close
	   @4		    KEY_COMMAND 	  Command
	   @5		    KEY_COPY		  Copy
	   @6		    KEY_CREATE		  Create
	   @7		    KEY_END		  End
	   @8		    KEY_ENTER		  Enter
	   @9		    KEY_EXIT		  Exit
	   F1		    KEY_F(11)		  Function Key 11
	   F2		    KEY_F(12)		  Function Key 12
	   F3		    KEY_F(13)		  Function Key 13
	   F4		    KEY_F(14)		  Function Key 14
	   F5		    KEY_F(15)		  Function Key 15
	   F6		    KEY_F(16)		  Function Key 16
	   F7		    KEY_F(17)		  Function Key 17
	   F8		    KEY_F(18)		  Function Key 18
	   F9		    KEY_F(19)		  Function Key 19
	   FA		    KEY_F(20)		  Function Key 20
	   FB		    KEY_F(21)		  Function Key 21
	   FC		    KEY_F(22)		  Function Key 22
	   FD		    KEY_F(23)		  Function Key 23
	   FE		    KEY_F(24)		  Function Key 24
	   FF		    KEY_F(25)		  Function Key 25
	   FG		    KEY_F(26)		  Function Key 26
	   FH		    KEY_F(27)		  Function Key 27
	   FI		    KEY_F(28)		  Function Key 28
	   FJ		    KEY_F(29)		  Function Key 29
	   FK		    KEY_F(30)		  Function Key 30
	   FL		    KEY_F(31)		  Function Key 31
	   FM		    KEY_F(32)		  Function Key 32
	   FN		    KEY_F(33)		  Function Key 33
	   FO		    KEY_F(34)		  Function Key 34
	   FP		    KEY_F(35)		  Function Key 35
	   FQ		    KEY_F(36)		  Function Key 36
	   FR		    KEY_F(37)		  Function Key 37
	   FS		    KEY_F(38)		  Function Key 38
	   FT		    KEY_F(39)		  Function Key 39
	   FU		    KEY_F(40)		  Function Key 40
	   FV		    KEY_F(41)		  Function Key 41
	   FW		    KEY_F(42)		  Function Key 42
	   FX		    KEY_F(43)		  Function Key 43
	   FY		    KEY_F(44)		  Function Key 44
	   FZ		    KEY_F(45)		  Function Key 45
	   Fa		    KEY_F(46)		  Function Key 46
	   Fb		    KEY_F(47)		  Function Key 47
	   Fc		    KEY_F(48)		  Function Key 48
	   Fd		    KEY_F(49)		  Function Key 49
	   Fe		    KEY_F(50)		  Function Key 50
	   Ff		    KEY_F(51)		  Function Key 51
	   Fg		    KEY_F(52)		  Function Key 52
	   Fh		    KEY_F(53)		  Function Key 53
	   Fi		    KEY_F(54)		  Function Key 54
	   Fj		    KEY_F(55)		  Function Key 55
	   Fk		    KEY_F(56)		  Function Key 56
	   Fl		    KEY_F(57)		  Function Key 57
	   Fm		    KEY_F(58)		  Function Key 58
	   Fn		    KEY_F(59)		  Function Key 59
	   Fo		    KEY_F(60)		  Function Key 60
	   Fp		    KEY_F(61)		  Function Key 61
	   Fq		    KEY_F(62)		  Function Key 62
	   Fr		    KEY_F(63)		  Function Key 63
	   K1		    KEY_A1		  Upper left key in keypad
	   K2		    KEY_B2		  Centre key in keypad
	   K3		    KEY_A3		  Upper right key in keypad
	   K4		    KEY_C1		  Lower left key in keypad
	   K5		    KEY_C3		  Lower right key in keypad
	   Km		    KEY_MOUSE		  Mouse Event
	   k0		    KEY_F0		  Function Key 0
	   k1		    KEY_F(1)		  Function Key 1
	   k2		    KEY_F(2)		  Function Key 2
	   k3		    KEY_F(3)		  Function Key 3
	   k4		    KEY_F(4)		  Function Key 4
	   k5		    KEY_F(5)		  Function Key 5
	   k6		    KEY_F(6)		  Function Key 6
	   k7		    KEY_F(7)		  Function Key 7
	   k8		    KEY_F(8)		  Function Key 8
	   k9		    KEY_F(9)		  Function Key 9
	   k;		    KEY_F(10)		  Function Key 10
	   kA		    KEY_IL		  Insert Line
	   ka		    KEY_CATAB		  Clear All Tabs
	   kB		    KEY_BTAB		  Back Tab
	   kb		    KEY_BACKSPACE	  Backspace
	   kC		    KEY_CLEAR		  Clear
	   kD		    KEY_DC		  Delete Character
	   kd		    KEY_DOWN		  Down Arrow
	   kE		    KEY_EOL		  Clear to End Of Line
	   kF		    KEY_SF		  Scroll Forward one line
	   kH		    KEY_LL		  Home Down
	   kh		    KEY_HOME		  Home
	   kI		    KEY_IC		  Insert Character
	   kL		    KEY_DL		  Delete Line
	   kl		    KEY_LEFT		  Left Arrow
	   kM		    KEY_EIC		  Exit Insert Character Mode
	   kN		    KEY_NPAGE		  Next Page
	   kP		    KEY_PPAGE		  Previous Page
	   kR		    KEY_SR		  Scroll One Line Back
	   kr		    KEY_RIGHT		  Right Arrow
	   kS		    KEY_EOS		  Clear to End Of Screen
	   kT		    KEY_STAB		  Set Tab
	   kt		    KEY_CTAB		  Clear Tab
	   ku		    KEY_UP		  Up Arrow

     Note that not all terminals are capable of generating all the keycodes listed above nor are
     termcap entries normally configured with all the above capabilities defined.

     Other functions that return an int will return one of the following values:

     OK   The function completed successfully.
     ERR  An error occurred in the function.

     Functions returning pointers will return NULL if an error is detected.

SEE ALSO
     curses_cursor(3), curses_keyname(3), curses_refresh(3), curses_tty(3), termcap(5)

STANDARDS
     The NetBSD Curses library complies with the X/Open Curses specification, part of the Single
     Unix Specification.

NOTES
     The keyok() and define_key() functions are implementations of extensions made by the NCurses
     library to the Curses standard.  Portable implementations should avoid the use of these
     functions.

HISTORY
     The Curses package appeared in 4.0BSD.

BSD					  July 25, 2006 				      BSD


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