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/* $OpenBSD: lib_twait.c,v 1.8 2001/01/22 18:02:00 millert Exp $ */
/****************************************************************************
* Copyright (c) 1998,1999,2000 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).
*/
#ifdef __BEOS__
#include <OS.h>
#endif
#include <curses.priv.h>
#if USE_FUNC_POLL
# 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
MODULE_ID("$From: lib_twait.c,v 1.41 2000/12/10 03:04:30 tom Exp $")
static long
_nc_gettime(bool first)
{
long res;
#if HAVE_GETTIMEOFDAY
# define PRECISE_GETTIME 1
static struct timeval t0;
struct timeval t1;
gettimeofday(&t1, (struct timezone *) 0);
if (first) {
t0 = t1;
}
res = (t1.tv_sec - t0.tv_sec) * 1000
+ (t1.tv_usec - t0.tv_usec) / 1000;
#else
# define PRECISE_GETTIME 0
static time_t t0;
time_t t1 = time((time_t *) 0);
if (first) {
t0 = t1;
}
res = (t1 - t0) * 1000;
#endif
T(("%s time: %ld msec", first ? "get" : "elapsed", 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.
*/
NCURSES_EXPORT(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 defined(__BEOS__)
#elif HAVE_SELECT
static fd_set *set;
static size_t setsize;
size_t nsetsize;
int readfd;
#endif
long starttime, returntime;
T(("start twait: %d milliseconds, mode: %d", milliseconds, mode));
#if PRECISE_GETTIME
retry:
#endif
starttime = _nc_gettime(TRUE);
count = 0;
#if USE_FUNC_POLL
memset(fds, 0, sizeof(fds));
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 defined(__BEOS__)
/*
* BeOS's select() is declared in socket.h, so the configure script does
* not see it. That's just as well, since that function works only for
* sockets. This (using snooze and ioctl) was distilled from Be's patch
* for ncurses which uses a separate thread to simulate select().
*
* FIXME: the return values from the ioctl aren't very clear if we get
* interrupted.
*/
result = 0;
if (mode & 1) {
bigtime_t d;
bigtime_t useconds = milliseconds * 1000;
int n, howmany;
if (useconds == 0) /* we're here to go _through_ the loop */
useconds = 1;
for (d = 0; d < useconds; d += 5000) {
n = 0;
howmany = ioctl(0, 'ichr', &n);
if (howmany >= 0 && n > 0) {
result = 1;
break;
}
if (useconds > 1)
snooze(5000);
milliseconds -= 5;
}
} else if (milliseconds > 0) {
snooze(milliseconds * 1000);
milliseconds = 0;
}
#elif HAVE_SELECT
if (mode & 1) {
count = SP->_ifd;
readfd = SP->_ifd;
}
if ((mode & 2) && (fd = SP->_mouse_fd) >= 0) {
count = max(fd, count);
readfd = fd;
}
/*
* grow set as needed.
*/
nsetsize = howmany(count, NFDBITS) * sizeof(fd_mask);
if (setsize == 0 || setsize < nsetsize) {
setsize = nsetsize;
set = _nc_doalloc(set, setsize);
}
/*
* select() modifies the fd_set arguments; do this in the
* loop.
*/
memset(set, 0, setsize);
FD_SET(readfd, set);
if (milliseconds >= 0) {
struct timeval ntimeout;
ntimeout.tv_sec = milliseconds / 1000;
ntimeout.tv_usec = (milliseconds % 1000) * 1000;
result = select(count + 1, set, NULL, NULL, &ntimeout);
} else {
result = select(count + 1, set, NULL, NULL, NULL);
}
#endif
returntime = _nc_gettime(FALSE);
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);
}
}
#elif defined(__BEOS__)
result = 1; /* redundant, but simple */
#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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