'\" te
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.TH TYPEAHEAD 3XCURSES "Jun 5, 2002"
.SH NAME
typeahead \- check for type-ahead characters
.SH SYNOPSIS
.LP
.nf
\fBcc\fR [ \fIflag\fR... ] \fIfile\fR... \fB-I\fR /usr/xpg4/include \fB -L \fR /usr/xpg4/lib \e
\fB -R \fR /usr/xpg4/lib \fB -lcurses \fR [ \fIlibrary\fR... ]

\fBc89\fR [ \fIflag\fR... ] \fIfile\fR... \fB-lcurses\fR [ \fIlibrary\fR... ]

#include <curses.h>

\fBint\fR \fBtypeahead\fR(\fBint\fR \fIfd\fR);
.fi

.SH PARAMETERS
.sp
.ne 2
.na
\fB\fIfd\fR\fR
.ad
.RS 6n
Is the file descriptor that is used to check for type-ahead characters.
.RE

.SH DESCRIPTION
.sp
.LP
The \fBtypeahead()\fR function specifies the file descriptor (\fIfd\fR) to use
to check for type-ahead characters (characters typed by the user but not yet
processed by X/Open Curses).
.sp
.LP
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  \fBrefresh\fR(3XCURSES) or \fBdoupdate\fR(3XCURSES). This speeds up
response to commands that have been typed ahead.  Normally, the input file
pointer passed to \fBnewterm\fR(3XCURSES), or \fBstdin\fR  in the case of
\fBinitscr\fR(3XCURSES), is used for type-ahead checking.
.sp
.LP
If \fIfd\fR is -1, no type-ahead checking is done.
.SH RETURN VALUES
.sp
.LP
On success, the \fBtypeahead()\fR function returns \fBOK\fR. Otherwise, it
returns \fBERR\fR.
.SH ERRORS
.sp
.LP
None.
.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(5) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Interface Stability	Standard
_
MT-Level	Unsafe
.TE

.SH SEE ALSO
.sp
.LP
\fBdoupdate\fR(3XCURSES), \fBgetch\fR(3XCURSES), \fBinitscr\fR(3XCURSES),
\fBlibcurses\fR(3XCURSES), \fBattributes\fR(5), \fBstandards\fR(5)