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ncursesw-morphos/ncurses/tty/lib_twait.c
Thomas E. Dickey f79b52fddd ncurses 5.7 - patch 20101225 
+ modify nc_tparm.h, adding guards against repeated inclusion, and
  allowing TPARM_ARG to be overridden.
+ fix some strict compiler warnings in ncurses library.
2010-12-26 01:22:11 +00:00

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/****************************************************************************
* Copyright (c) 1998-2009,2010 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> *
* and: Thomas E. Dickey 1996-on *
****************************************************************************/
/*
** 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 defined __HAIKU__ && defined __BEOS__
#undef __BEOS__
#endif
#ifdef __BEOS__
#undef false
#undef true
#include <OS.h>
#endif
#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
#ifdef __MINGW32__
# include <sys/time.h>
#endif
#undef CUR
MODULE_ID("$Id: lib_twait.c,v 1.61 2010/12/25 23:43:58 tom Exp $")
static long
_nc_gettime(TimeType * t0, bool first)
{
long res;
#if PRECISE_GETTIME
TimeType t1;
gettimeofday(&t1, (struct timezone *) 0);
if (first) {
*t0 = t1;
res = 0;
} else {
/* .tv_sec and .tv_usec are unsigned, be careful when subtracting */
if (t0->tv_usec > t1.tv_usec) {
t1.tv_usec += 1000000; /* Convert 1s in 1e6 microsecs */
t1.tv_sec--;
}
res = (t1.tv_sec - t0->tv_sec) * 1000
+ (t1.tv_usec - t0->tv_usec) / 1000;
}
#else
time_t t1 = time((time_t *) 0);
if (first) {
*t0 = t1;
}
res = (t1 - *t0) * 1000;
#endif
TR(TRACE_IEVENT, ("%s time: %ld msec", first ? "get" : "elapsed", res));
return res;
}
#ifdef NCURSES_WGETCH_EVENTS
NCURSES_EXPORT(int)
_nc_eventlist_timeout(_nc_eventlist * evl)
{
int event_delay = -1;
int n;
if (evl != 0) {
for (n = 0; n < evl->count; ++n) {
_nc_event *ev = evl->events[n];
if (ev->type == _NC_EVENT_TIMEOUT_MSEC) {
event_delay = ev->data.timeout_msec;
if (event_delay < 0)
event_delay = INT_MAX; /* FIXME Is this defined? */
}
}
}
return event_delay;
}
#endif /* NCURSES_WGETCH_EVENTS */
#if (USE_FUNC_POLL || HAVE_SELECT)
# define MAYBE_UNUSED
#else
# define MAYBE_UNUSED GCC_UNUSED
#endif
#if (USE_FUNC_POLL || HAVE_SELECT)
# define MAYBE_UNUSED
#else
# define MAYBE_UNUSED GCC_UNUSED
#endif
/*
* 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:
* TW_NONE 0 - none (absolute time)
* TW_INPUT 1 - ncurses' normal input-descriptor
* TW_MOUSE 2 - mouse descriptor, if any
* TW_ANY 3 - either input or mouse.
* TW_EVENT 4 -
* Experimental: if NCURSES_WGETCH_EVENTS is defined, (mode & 4) determines
* whether to pay attention to evl argument. If set, the smallest of
* millisecond and of timeout of evl is taken.
*
* 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(SCREEN *sp MAYBE_UNUSED,
int mode MAYBE_UNUSED,
int milliseconds,
int *timeleft
EVENTLIST_2nd(_nc_eventlist * evl))
{
int count;
int result = TW_NONE;
TimeType t0;
#if (USE_FUNC_POLL || HAVE_SELECT)
int fd;
#endif
#ifdef NCURSES_WGETCH_EVENTS
int timeout_is_event = 0;
int n;
#endif
#if USE_FUNC_POLL
#define MIN_FDS 2
struct pollfd fd_list[MIN_FDS];
struct pollfd *fds = fd_list;
#elif defined(__BEOS__)
#elif HAVE_SELECT
fd_set set;
#endif
long starttime, returntime;
TR(TRACE_IEVENT, ("start twait: %d milliseconds, mode: %d",
milliseconds, mode));
#ifdef NCURSES_WGETCH_EVENTS
if (mode & TW_EVENT) {
int event_delay = _nc_eventlist_timeout(evl);
if (event_delay >= 0
&& (milliseconds >= event_delay || milliseconds < 0)) {
milliseconds = event_delay;
timeout_is_event = 1;
}
}
#endif
#if PRECISE_GETTIME && HAVE_NANOSLEEP
retry:
#endif
starttime = _nc_gettime(&t0, TRUE);
count = 0;
#ifdef NCURSES_WGETCH_EVENTS
if ((mode & TW_EVENT) && evl)
evl->result_flags = 0;
#endif
#if USE_FUNC_POLL
memset(fd_list, 0, sizeof(fd_list));
#ifdef NCURSES_WGETCH_EVENTS
if ((mode & TW_EVENT) && evl)
fds = typeMalloc(struct pollfd, MIN_FDS + evl->count);
#endif
if (mode & TW_INPUT) {
fds[count].fd = sp->_ifd;
fds[count].events = POLLIN;
count++;
}
if ((mode & TW_MOUSE)
&& (fd = sp->_mouse_fd) >= 0) {
fds[count].fd = fd;
fds[count].events = POLLIN;
count++;
}
#ifdef NCURSES_WGETCH_EVENTS
if ((mode & TW_EVENT) && evl) {
for (n = 0; n < evl->count; ++n) {
_nc_event *ev = evl->events[n];
if (ev->type == _NC_EVENT_FILE
&& (ev->data.fev.flags & _NC_EVENT_FILE_READABLE)) {
fds[count].fd = ev->data.fev.fd;
fds[count].events = POLLIN;
count++;
}
}
}
#endif
result = poll(fds, (unsigned) count, milliseconds);
#ifdef NCURSES_WGETCH_EVENTS
if ((mode & TW_EVENT) && evl) {
int c;
if (!result)
count = 0;
for (n = 0; n < evl->count; ++n) {
_nc_event *ev = evl->events[n];
if (ev->type == _NC_EVENT_FILE
&& (ev->data.fev.flags & _NC_EVENT_FILE_READABLE)) {
ev->data.fev.result = 0;
for (c = 0; c < count; c++)
if (fds[c].fd == ev->data.fev.fd
&& fds[c].revents & POLLIN) {
ev->data.fev.result |= _NC_EVENT_FILE_READABLE;
evl->result_flags |= _NC_EVENT_FILE_READABLE;
}
} else if (ev->type == _NC_EVENT_TIMEOUT_MSEC
&& !result && timeout_is_event) {
evl->result_flags |= _NC_EVENT_TIMEOUT_MSEC;
}
}
}
if (fds != fd_list)
free((char *) fds);
#endif
#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.
*
* FIXME: this assumes mode&1 if milliseconds < 0 (see lib_getch.c).
*/
result = TW_NONE;
if (mode & TW_INPUT) {
int step = (milliseconds < 0) ? 0 : 5000;
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 += step) {
n = 0;
howmany = ioctl(0, 'ichr', &n);
if (howmany >= 0 && n > 0) {
result = 1;
break;
}
if (useconds > 1 && step > 0) {
snooze(step);
milliseconds -= (step / 1000);
if (milliseconds <= 0) {
milliseconds = 0;
break;
}
}
}
} else if (milliseconds > 0) {
snooze(milliseconds * 1000);
milliseconds = 0;
}
#elif HAVE_SELECT
/*
* select() modifies the fd_set arguments; do this in the
* loop.
*/
FD_ZERO(&set);
if (mode & TW_INPUT) {
FD_SET(sp->_ifd, &set);
count = sp->_ifd + 1;
}
if ((mode & TW_MOUSE)
&& (fd = sp->_mouse_fd) >= 0) {
FD_SET(fd, &set);
count = max(fd, count) + 1;
}
#ifdef NCURSES_WGETCH_EVENTS
if ((mode & TW_EVENT) && evl) {
for (n = 0; n < evl->count; ++n) {
_nc_event *ev = evl->events[n];
if (ev->type == _NC_EVENT_FILE
&& (ev->data.fev.flags & _NC_EVENT_FILE_READABLE)) {
FD_SET(ev->data.fev.fd, &set);
count = max(ev->data.fev.fd + 1, count);
}
}
}
#endif
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);
}
#ifdef NCURSES_WGETCH_EVENTS
if ((mode & TW_EVENT) && evl) {
evl->result_flags = 0;
for (n = 0; n < evl->count; ++n) {
_nc_event *ev = evl->events[n];
if (ev->type == _NC_EVENT_FILE
&& (ev->data.fev.flags & _NC_EVENT_FILE_READABLE)) {
ev->data.fev.result = 0;
if (FD_ISSET(ev->data.fev.fd, &set)) {
ev->data.fev.result |= _NC_EVENT_FILE_READABLE;
evl->result_flags |= _NC_EVENT_FILE_READABLE;
}
} else if (ev->type == _NC_EVENT_TIMEOUT_MSEC
&& !result && timeout_is_event)
evl->result_flags |= _NC_EVENT_TIMEOUT_MSEC;
}
}
#endif
#endif /* USE_FUNC_POLL, etc */
returntime = _nc_gettime(&t0, FALSE);
if (milliseconds >= 0)
milliseconds -= (int) (returntime - starttime);
#ifdef NCURSES_WGETCH_EVENTS
if (evl) {
evl->result_flags = 0;
for (n = 0; n < evl->count; ++n) {
_nc_event *ev = evl->events[n];
if (ev->type == _NC_EVENT_TIMEOUT_MSEC) {
long diff = (returntime - starttime);
if (ev->data.timeout_msec <= diff)
ev->data.timeout_msec = 0;
else
ev->data.timeout_msec -= diff;
}
}
}
#endif
#if PRECISE_GETTIME && HAVE_NANOSLEEP
/*
* 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); /* FIXME: this won't be right if I recur! */
milliseconds -= 100;
goto retry;
}
#endif
/* return approximate time left in milliseconds */
if (timeleft)
*timeleft = milliseconds;
TR(TRACE_IEVENT, ("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 < MIN_FDS; count++) {
if ((mode & (1 << count))
&& (fds[count].revents & POLLIN)) {
result |= (1 << count);
}
}
#elif defined(__BEOS__)
result = TW_INPUT; /* redundant, but simple */
#elif HAVE_SELECT
if ((mode & TW_MOUSE)
&& (fd = sp->_mouse_fd) >= 0
&& FD_ISSET(fd, &set))
result |= TW_MOUSE;
if ((mode & TW_INPUT)
&& FD_ISSET(sp->_ifd, &set))
result |= TW_INPUT;
#endif
} else
result = 0;
}
#ifdef NCURSES_WGETCH_EVENTS
if ((mode & TW_EVENT) && evl && evl->result_flags)
result |= TW_EVENT;
#endif
return (result);
}
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