TERMKEY_ADVISEREADABLE(3)TERMKEY_ADVISEREADABLE(3)NAMEtermkey_advisereadable - read more bytes from the underlying terminal
SYNOPSIS
#include <termkey.h>
TermKeyResult termkey_advisereadable(TermKey *tk);
Link with -ltermkey.
DESCRIPTIONtermkey_advisereadable() informs the termkey(7) instance that new input
may be available on the underlying file descriptor and so it should
call read(2) to obtain it. If at least one more byte was read it will
return TERMKEY_RES_AGAIN to indicate it may be useful to call
termkey_getkey(3) again. If no more input was read then
TERMKEY_RES_NONE is returned. If there was no buffer space remaining,
then TERMKEY_RES_ERROR is returned with errno set to ENOMEM. If no
filehandle is associated with this instance, TERMKEY_RES_ERROR is
returned with errno set to EBADF.
This function, along with termkey_getkey(3) make it possible to use the
termkey instance in an asynchronous program. To provide bytes without
using a readable file handle, use termkey_push_bytes(3).
For synchronous usage, termkey_waitkey(3) performs the input blocking
task.
RETURN VALUEtermkey_advisereadable() returns one of the following constants:
TERMKEY_RES_AGAIN
At least one byte was read.
TERMKEY_RES_NONE
No nore bytes were read.
TERMKEY_RES_ERROR
An IO error occured. errno will be preserved. If the error is
EINTR then this will only be returned if TERMKEY_FLAG_EINTR flag
is not set; if it is then the IO operation will be retried
instead.
SEE ALSOtermkey_getkey(3), termkey_waitkey(3), termkey_set_waittime(3),
termkey(7)TERMKEY_ADVISEREADABLE(3)
