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/* $OpenBSD: lib_twait.c,v 1.4 1998/07/23 21:19:45 millert Exp $ */
/****************************************************************************
* Copyright (c) 1998 Free Software Foundation, Inc. *
* *
* Permission is hereby granted, free of charge, to any person obtaining a *
* copy of this software and associated documentation files (the *
* "Software"), to deal in the Software without restriction, including *
* without limitation the rights to use, copy, modify, merge, publish, *
* distribute, distribute with modifications, sublicense, and/or sell *
* copies of the Software, and to permit persons to whom the Software is *
* furnished to do so, subject to the following conditions: *
* *
* The above copyright notice and this permission notice shall be included *
* in all copies or substantial portions of the Software. *
* *
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
* IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
* THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
* *
* Except as contained in this notice, the name(s) of the above copyright *
* holders shall not be used in advertising or otherwise to promote the *
* sale, use or other dealings in this Software without prior written *
* authorization. *
****************************************************************************/
/****************************************************************************
* Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 *
* and: Eric S. Raymond <esr@snark.thyrsus.com> *
****************************************************************************/
/*
** lib_twait.c
**
** The routine _nc_timed_wait().
**
** (This file was originally written by Eric Raymond; however except for
** comments, none of the original code remains - T.Dickey).
*/
#include <curses.priv.h>
#if USE_FUNC_POLL
# include <stropts.h>
# include <poll.h>
# if HAVE_SYS_TIME_H
# include <sys/time.h>
# endif
#elif HAVE_SELECT
# if HAVE_SYS_TIME_H && HAVE_SYS_TIME_SELECT
# include <sys/time.h>
# endif
# if HAVE_SYS_SELECT_H
# include <sys/select.h>
# endif
#endif
#ifdef __BEOS__
/* BeOS select() only works on sockets. Use the tty hack instead */
#include <socket.h>
#define select check_select
#endif
MODULE_ID("$From: lib_twait.c,v 1.32 1998/06/06 22:44:14 tom Exp $")
static int _nc_gettime(void)
{
int res;
#if HAVE_GETTIMEOFDAY
# define PRECISE_GETTIME 1
struct timeval t;
gettimeofday(&t, (struct timezone *)0);
res = t.tv_sec*1000 + t.tv_usec/1000;
#else
# define PRECISE_GETTIME 0
res = time(0)*1000;
#endif
T(("time: %d msec", res));
return res;
}
/*
* Wait a specified number of milliseconds, returning nonzero if the timer
* didn't expire before there is activity on the specified file descriptors.
* The file-descriptors are specified by the mode:
* 0 - none (absolute time)
* 1 - ncurses' normal input-descriptor
* 2 - mouse descriptor, if any
* 3 - either input or mouse.
* We return a mask that corresponds to the mode (e.g., 2 for mouse activity).
*
* If the milliseconds given are -1, the wait blocks until activity on the
* descriptors.
*/
int _nc_timed_wait(int mode, int milliseconds, int *timeleft)
{
int fd;
int count;
int result;
#if USE_FUNC_POLL
struct pollfd fds[2];
#elif HAVE_SELECT
static fd_set set;
#endif
int starttime, returntime;
T(("start twait: %d milliseconds, mode: %d", milliseconds, mode));
#if PRECISE_GETTIME
retry:
#endif
starttime = _nc_gettime();
count = 0;
#if USE_FUNC_POLL
if (mode & 1) {
fds[count].fd = SP->_ifd;
fds[count].events = POLLIN;
count++;
}
if ((mode & 2)
&& (fd = SP->_mouse_fd) >= 0) {
fds[count].fd = fd;
fds[count].events = POLLIN;
count++;
}
result = poll(fds, count, milliseconds);
#elif HAVE_SELECT
/*
* select() modifies the fd_set arguments; do this in the
* loop.
*/
FD_ZERO(&set);
if (mode & 1) {
FD_SET(SP->_ifd, &set);
count = SP->_ifd + 1;
}
if ((mode & 2)
&& (fd = SP->_mouse_fd) >= 0) {
FD_SET(fd, &set);
count = max(fd, count) + 1;
}
if (milliseconds >= 0) {
struct timeval ntimeout;
ntimeout.tv_sec = milliseconds / 1000;
ntimeout.tv_usec = (milliseconds % 1000) * 1000;
result = select(count, &set, NULL, NULL, &ntimeout);
} else {
result = select(count, &set, NULL, NULL, NULL);
}
#endif
returntime = _nc_gettime();
if (milliseconds >= 0)
milliseconds -= returntime-starttime;
#if PRECISE_GETTIME
/*
* If the timeout hasn't expired, and we've gotten no data,
* this is probably a system where 'select()' needs to be left
* alone so that it can complete. Make this process sleep,
* then come back for more.
*/
if (result == 0 && milliseconds > 100) {
napms(100);
milliseconds -= 100;
goto retry;
}
#endif
/* return approximate time left in milliseconds */
if (timeleft)
*timeleft = milliseconds;
T(("end twait: returned %d (%d), remaining time %d msec",
result, errno, milliseconds));
/*
* Both 'poll()' and 'select()' return the number of file descriptors
* that are active. Translate this back to the mask that denotes which
* file-descriptors, so that we don't need all of this system-specific
* code everywhere.
*/
if (result != 0) {
if (result > 0) {
result = 0;
#if USE_FUNC_POLL
for (count = 0; count < 2; count++) {
if ((mode & (1 << count))
&& (fds[count].revents & POLLIN)) {
result |= (1 << count);
count++;
}
}
#elif HAVE_SELECT
if ((mode & 2)
&& (fd = SP->_mouse_fd) >= 0
&& FD_ISSET(fd, &set))
result |= 2;
if ((mode & 1)
&& FD_ISSET(SP->_ifd, &set))
result |= 1;
#endif
}
else
result = 0;
}
return (result);
}
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