TYPEAHEAD(3XCURSES) X/Open Curses Library Functions TYPEAHEAD(3XCURSES)

NAME

typeahead - check for type-ahead characters

SYNOPSIS

cc [ flag... ] file... -I /usr/xpg4/include -L /usr/xpg4/lib \
-R /usr/xpg4/lib -lcurses [ library... ]

c89 [ flag... ] file... -lcurses [ library... ]

#include <curses.h>

int typeahead(int fd);

PARAMETERS

fd
Is the file descriptor that is used to check for type-ahead
characters.

DESCRIPTION

The typeahead() function specifies the file descriptor (fd) to use to
check for type-ahead characters (characters typed by the user but not
yet processed by X/Open Curses).


X/Open Curses checks for type-ahead characters periodically while
updating the screen. If characters are found, the current update is
postponed until the next refresh(3XCURSES) or doupdate(3XCURSES).
This speeds up response to commands that have been typed ahead.
Normally, the input file pointer passed to newterm(3XCURSES), or
stdin in the case of initscr(3XCURSES), is used for type-ahead
checking.


If fd is -1, no type-ahead checking is done.

RETURN VALUES

On success, the typeahead() function returns OK. Otherwise, it
returns ERR.

ERRORS

None.

ATTRIBUTES

See attributes(7) for descriptions of the following attributes:


+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|Interface Stability | Standard |
+--------------------+-----------------+
|MT-Level | Unsafe |
+--------------------+-----------------+

SEE ALSO

doupdate(3XCURSES), getch(3XCURSES), initscr(3XCURSES),
libcurses(3XCURSES), attributes(7), standards(7)

June 5, 2002 TYPEAHEAD(3XCURSES)