typeahead.3cur

<B>Digital的Unix操作系统VAX 4.2源码</B>

.TH typeahead 3cur 
.SH Name
typeahead \- check for typeahead
.SH Syntax
.br
.B
int typeahead(fd)
.br
.B
int fd;
.SH Description
.NXR "typeahead subroutine"
If
.PN typeahead 
is enabled,
the
.PN curses 
program looks for
typeahead input periodically while updating the screen.
If input is found, the current update will be postponed until 
.PN refresh 
or 
.PN doupdate 
is called again.
This allows faster response to commands typed in advance.
.PP
Normally, the input FILE 
pointer passed to 
the
.PN newterm 
routine,
will be used to do this typeahead checking.
If the routine 
.PN initscr 
was called, the input FILE pointer is passed to
.PN stdin .
.PP
The 
.PN typeahead 
routine specifies that the file descriptor 
.PN fd
is to be used to check for typeahead.
If 
.PN fd
is \-1, then typeahead is disabled.
.SH Return Values
No return values are defined for this function.
.SH See Also
doupdate(3cur), initscr(3cur), newterm(3cur), refresh(3cur)