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/*
* Wait and read single byte input from device.
* $Id$
* Copyright (c) 1997 by Tycho Softworks.
* For conditions of distribution and reuse see product license.
*/
#include <dev/tty.h>
#include <std/select.h>
#include <std/poll.h>
#ifndef SYS_POLL_H_MISSING
#define USE_POLL
#endif
#ifndef POLL_H_MISSING
#define USE_POLL
#endif
#ifdef USE_POLL
int inkey(fd_t fd, int timeout)
{
struct pollfd poller;
uchar buf;
poller.fd = fd;
poller.revents = 0;
poller.events = POLLIN ;
if(!poll(&poller, 1, timeout))
return -1;
if(poller.revents & (POLLERR | POLLHUP))
return -1;
if(read(fd, &buf, 1) != 1)
return -1;
return buf;
}
#else
int inkey(fd_t fd, int timeout)
{
fd_set inp,out,exc;
struct timeval timer;
uchar buf;
FD_ZERO(&inp);
FD_ZERO(&out);
FD_ZERO(&exc);
FD_SET(fd, &inp);
FD_SET(fd, &exc);
timer.tv_sec = timeout / 1000;
timer.tv_usec = timeout % 1000;
if(!select(fd + 1, &inp, &out, &exc, &timer))
return -1;
if(FD_ISSET(fd, &exc))
return -1;
if(FD_ISSET(fd, &inp))
{
if(read(fd, &buf, 1) != 1)
return -1;
return buf;
}
return -1;
}
#endif
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