GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libcurses/tty/lib_twait.c Lines: 0 42 0.0 %
Date: 2017-11-13 Branches: 0 26 0.0 %

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/* $OpenBSD: lib_twait.c,v 1.9 2010/01/12 23:22:07 nicm Exp $ */
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/****************************************************************************
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 * Copyright (c) 1998-2007,2008 Free Software Foundation, Inc.              *
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 *                                                                          *
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 * Permission is hereby granted, free of charge, to any person obtaining a  *
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 * copy of this software and associated documentation files (the            *
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 * "Software"), to deal in the Software without restriction, including      *
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 * without limitation the rights to use, copy, modify, merge, publish,      *
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 * distribute, distribute with modifications, sublicense, and/or sell       *
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 * copies of the Software, and to permit persons to whom the Software is    *
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 * furnished to do so, subject to the following conditions:                 *
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 *                                                                          *
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 * The above copyright notice and this permission notice shall be included  *
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 * in all copies or substantial portions of the Software.                   *
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 *                                                                          *
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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
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 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
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 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
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 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
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 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
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 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
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 * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
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 *                                                                          *
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 * Except as contained in this notice, the name(s) of the above copyright   *
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 * holders shall not be used in advertising or otherwise to promote the     *
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 * sale, use or other dealings in this Software without prior written       *
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 * authorization.                                                           *
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 ****************************************************************************/
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/****************************************************************************
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 *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
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 *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
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 *     and: Thomas E. Dickey                        1996-on                 *
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 ****************************************************************************/
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/*
38
**	lib_twait.c
39
**
40
**	The routine _nc_timed_wait().
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**
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**	(This file was originally written by Eric Raymond; however except for
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**	comments, none of the original code remains - T.Dickey).
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*/
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46
#include <curses.priv.h>
47
48
#if defined __HAIKU__ && defined __BEOS__
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#undef __BEOS__
50
#endif
51
52
#ifdef __BEOS__
53
#undef false
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#undef true
55
#include <OS.h>
56
#endif
57
58
#if USE_FUNC_POLL
59
# if HAVE_SYS_TIME_H
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#  include <sys/time.h>
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# endif
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#elif HAVE_SELECT
63
# if HAVE_SYS_TIME_H && HAVE_SYS_TIME_SELECT
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#  include <sys/time.h>
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# endif
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# if HAVE_SYS_SELECT_H
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#  include <sys/select.h>
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# endif
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#endif
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71
#undef CUR
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MODULE_ID("$Id: lib_twait.c,v 1.9 2010/01/12 23:22:07 nicm Exp $")
74
75
static long
76
_nc_gettime(TimeType * t0, bool first)
77
{
78
    long res;
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80
#if PRECISE_GETTIME
81
    TimeType t1;
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    gettimeofday(&t1, (struct timezone *) 0);
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    if (first) {
84
	*t0 = t1;
85
	res = 0;
86
    } else {
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	/* .tv_sec and .tv_usec are unsigned, be careful when subtracting */
88
	if (t0->tv_usec > t1.tv_usec) {
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	    t1.tv_usec += 1000000;	/* Convert 1s in 1e6 microsecs */
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	    t1.tv_sec--;
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	}
92
	res = (t1.tv_sec - t0->tv_sec) * 1000
93
	    + (t1.tv_usec - t0->tv_usec) / 1000;
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    }
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#else
96
    time_t t1 = time((time_t *) 0);
97
    if (first) {
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	*t0 = t1;
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    }
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    res = (t1 - *t0) * 1000;
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#endif
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    TR(TRACE_IEVENT, ("%s time: %ld msec", first ? "get" : "elapsed", res));
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    return res;
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}
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106
#ifdef NCURSES_WGETCH_EVENTS
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NCURSES_EXPORT(int)
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_nc_eventlist_timeout(_nc_eventlist * evl)
109
{
110
    int event_delay = -1;
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    int n;
112
113
    if (evl != 0) {
114
115
	for (n = 0; n < evl->count; ++n) {
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	    _nc_event *ev = evl->events[n];
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118
	    if (ev->type == _NC_EVENT_TIMEOUT_MSEC) {
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		event_delay = ev->data.timeout_msec;
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		if (event_delay < 0)
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		    event_delay = INT_MAX;	/* FIXME Is this defined? */
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	    }
123
	}
124
    }
125
    return event_delay;
126
}
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#endif /* NCURSES_WGETCH_EVENTS */
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129
/*
130
 * Wait a specified number of milliseconds, returning nonzero if the timer
131
 * didn't expire before there is activity on the specified file descriptors.
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 * The file-descriptors are specified by the mode:
133
 *	0 - none (absolute time)
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 *	1 - ncurses' normal input-descriptor
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 *	2 - mouse descriptor, if any
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 *	3 - either input or mouse.
137
 *
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 * Experimental:  if NCURSES_WGETCH_EVENTS is defined, (mode & 4) determines
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 * whether to pay attention to evl argument.  If set, the smallest of
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 * millisecond and of timeout of evl is taken.
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 *
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 * We return a mask that corresponds to the mode (e.g., 2 for mouse activity).
143
 *
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 * If the milliseconds given are -1, the wait blocks until activity on the
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 * descriptors.
146
 */
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NCURSES_EXPORT(int)
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_nc_timed_wait(SCREEN *sp,
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	       int mode,
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	       int milliseconds,
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	       int *timeleft
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	       EVENTLIST_2nd(_nc_eventlist * evl))
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{
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    int fd;
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    int count;
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    int result = 0;
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    TimeType t0;
158
159
#ifdef NCURSES_WGETCH_EVENTS
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    int timeout_is_event = 0;
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    int n;
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#endif
163
164
#if USE_FUNC_POLL
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#define MIN_FDS 2
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    struct pollfd fd_list[MIN_FDS];
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    struct pollfd *fds = fd_list;
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#elif defined(__BEOS__)
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#elif HAVE_SELECT
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    fd_set set;
171
#endif
172
173
    long starttime, returntime;
174
175
    TR(TRACE_IEVENT, ("start twait: %d milliseconds, mode: %d",
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		      milliseconds, mode));
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178
#ifdef NCURSES_WGETCH_EVENTS
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    if (mode & 4) {
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	int event_delay = _nc_eventlist_timeout(evl);
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	if (event_delay >= 0
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	    && (milliseconds >= event_delay || milliseconds < 0)) {
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	    milliseconds = event_delay;
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	    timeout_is_event = 1;
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	}
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    }
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#endif
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#if PRECISE_GETTIME && HAVE_NANOSLEEP
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  retry:
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#endif
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    starttime = _nc_gettime(&t0, TRUE);
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    count = 0;
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#ifdef NCURSES_WGETCH_EVENTS
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    if ((mode & 4) && evl)
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	evl->result_flags = 0;
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#endif
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#if USE_FUNC_POLL
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    memset(fd_list, 0, sizeof(fd_list));
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#ifdef NCURSES_WGETCH_EVENTS
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    if ((mode & 4) && evl)
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	fds = typeMalloc(struct pollfd, MIN_FDS + evl->count);
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#endif
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210
    if (mode & 1) {
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	fds[count].fd = sp->_ifd;
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	fds[count].events = POLLIN;
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	count++;
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    }
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    if ((mode & 2)
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	&& (fd = sp->_mouse_fd) >= 0) {
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	fds[count].fd = fd;
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	fds[count].events = POLLIN;
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	count++;
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    }
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#ifdef NCURSES_WGETCH_EVENTS
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    if ((mode & 4) && evl) {
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	for (n = 0; n < evl->count; ++n) {
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	    _nc_event *ev = evl->events[n];
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	    if (ev->type == _NC_EVENT_FILE
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		&& (ev->data.fev.flags & _NC_EVENT_FILE_READABLE)) {
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		fds[count].fd = ev->data.fev.fd;
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		fds[count].events = POLLIN;
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		count++;
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	    }
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	}
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    }
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#endif
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    result = poll(fds, (unsigned) count, milliseconds);
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#ifdef NCURSES_WGETCH_EVENTS
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    if ((mode & 4) && evl) {
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	int c;
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	if (!result)
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	    count = 0;
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	for (n = 0; n < evl->count; ++n) {
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	    _nc_event *ev = evl->events[n];
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	    if (ev->type == _NC_EVENT_FILE
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		&& (ev->data.fev.flags & _NC_EVENT_FILE_READABLE)) {
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		ev->data.fev.result = 0;
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		for (c = 0; c < count; c++)
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		    if (fds[c].fd == ev->data.fev.fd
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			&& fds[c].revents & POLLIN) {
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			ev->data.fev.result |= _NC_EVENT_FILE_READABLE;
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			evl->result_flags |= _NC_EVENT_FILE_READABLE;
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		    }
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	    } else if (ev->type == _NC_EVENT_TIMEOUT_MSEC
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		       && !result && timeout_is_event) {
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		evl->result_flags |= _NC_EVENT_TIMEOUT_MSEC;
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	    }
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	}
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    }
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    if (fds != fd_list)
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	free((char *) fds);
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#endif
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269
#elif defined(__BEOS__)
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    /*
271
     * BeOS's select() is declared in socket.h, so the configure script does
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     * not see it.  That's just as well, since that function works only for
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     * sockets.  This (using snooze and ioctl) was distilled from Be's patch
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     * for ncurses which uses a separate thread to simulate select().
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     *
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     * FIXME: the return values from the ioctl aren't very clear if we get
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     * interrupted.
278
     *
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     * FIXME: this assumes mode&1 if milliseconds < 0 (see lib_getch.c).
280
     */
281
    result = 0;
282
    if (mode & 1) {
283
	int step = (milliseconds < 0) ? 0 : 5000;
284
	bigtime_t d;
285
	bigtime_t useconds = milliseconds * 1000;
286
	int n, howmany;
287
288
	if (useconds <= 0)	/* we're here to go _through_ the loop */
289
	    useconds = 1;
290
291
	for (d = 0; d < useconds; d += step) {
292
	    n = 0;
293
	    howmany = ioctl(0, 'ichr', &n);
294
	    if (howmany >= 0 && n > 0) {
295
		result = 1;
296
		break;
297
	    }
298
	    if (useconds > 1 && step > 0) {
299
		snooze(step);
300
		milliseconds -= (step / 1000);
301
		if (milliseconds <= 0) {
302
		    milliseconds = 0;
303
		    break;
304
		}
305
	    }
306
	}
307
    } else if (milliseconds > 0) {
308
	snooze(milliseconds * 1000);
309
	milliseconds = 0;
310
    }
311
#elif HAVE_SELECT
312
    /*
313
     * select() modifies the fd_set arguments; do this in the
314
     * loop.
315
     */
316
    FD_ZERO(&set);
317
318
    if (mode & 1) {
319
	FD_SET(sp->_ifd, &set);
320
	count = sp->_ifd + 1;
321
    }
322
    if ((mode & 2)
323
	&& (fd = sp->_mouse_fd) >= 0) {
324
	FD_SET(fd, &set);
325
	count = max(fd, count) + 1;
326
    }
327
#ifdef NCURSES_WGETCH_EVENTS
328
    if ((mode & 4) && evl) {
329
	for (n = 0; n < evl->count; ++n) {
330
	    _nc_event *ev = evl->events[n];
331
332
	    if (ev->type == _NC_EVENT_FILE
333
		&& (ev->data.fev.flags & _NC_EVENT_FILE_READABLE)) {
334
		FD_SET(ev->data.fev.fd, &set);
335
		count = max(ev->data.fev.fd + 1, count);
336
	    }
337
	}
338
    }
339
#endif
340
341
    if (milliseconds >= 0) {
342
	struct timeval ntimeout;
343
	ntimeout.tv_sec = milliseconds / 1000;
344
	ntimeout.tv_usec = (milliseconds % 1000) * 1000;
345
	result = select(count, &set, NULL, NULL, &ntimeout);
346
    } else {
347
	result = select(count, &set, NULL, NULL, NULL);
348
    }
349
350
#ifdef NCURSES_WGETCH_EVENTS
351
    if ((mode & 4) && evl) {
352
	evl->result_flags = 0;
353
	for (n = 0; n < evl->count; ++n) {
354
	    _nc_event *ev = evl->events[n];
355
356
	    if (ev->type == _NC_EVENT_FILE
357
		&& (ev->data.fev.flags & _NC_EVENT_FILE_READABLE)) {
358
		ev->data.fev.result = 0;
359
		if (FD_ISSET(ev->data.fev.fd, &set)) {
360
		    ev->data.fev.result |= _NC_EVENT_FILE_READABLE;
361
		    evl->result_flags |= _NC_EVENT_FILE_READABLE;
362
		}
363
	    } else if (ev->type == _NC_EVENT_TIMEOUT_MSEC
364
		       && !result && timeout_is_event)
365
		evl->result_flags |= _NC_EVENT_TIMEOUT_MSEC;
366
	}
367
    }
368
#endif
369
370
#endif /* USE_FUNC_POLL, etc */
371
372
    returntime = _nc_gettime(&t0, FALSE);
373
374
    if (milliseconds >= 0)
375
	milliseconds -= (returntime - starttime);
376
377
#ifdef NCURSES_WGETCH_EVENTS
378
    if (evl) {
379
	evl->result_flags = 0;
380
	for (n = 0; n < evl->count; ++n) {
381
	    _nc_event *ev = evl->events[n];
382
383
	    if (ev->type == _NC_EVENT_TIMEOUT_MSEC) {
384
		long diff = (returntime - starttime);
385
		if (ev->data.timeout_msec <= diff)
386
		    ev->data.timeout_msec = 0;
387
		else
388
		    ev->data.timeout_msec -= diff;
389
	    }
390
391
	}
392
    }
393
#endif
394
395
#if PRECISE_GETTIME && HAVE_NANOSLEEP
396
    /*
397
     * If the timeout hasn't expired, and we've gotten no data,
398
     * this is probably a system where 'select()' needs to be left
399
     * alone so that it can complete.  Make this process sleep,
400
     * then come back for more.
401
     */
402
    if (result == 0 && milliseconds > 100) {
403
	napms(100);		/* FIXME: this won't be right if I recur! */
404
	milliseconds -= 100;
405
	goto retry;
406
    }
407
#endif
408
409
    /* return approximate time left in milliseconds */
410
    if (timeleft)
411
	*timeleft = milliseconds;
412
413
    TR(TRACE_IEVENT, ("end twait: returned %d (%d), remaining time %d msec",
414
		      result, errno, milliseconds));
415
416
    /*
417
     * Both 'poll()' and 'select()' return the number of file descriptors
418
     * that are active.  Translate this back to the mask that denotes which
419
     * file-descriptors, so that we don't need all of this system-specific
420
     * code everywhere.
421
     */
422
    if (result != 0) {
423
	if (result > 0) {
424
	    result = 0;
425
#if USE_FUNC_POLL
426
	    for (count = 0; count < MIN_FDS; count++) {
427
		if ((mode & (1 << count))
428
		    && (fds[count].revents & POLLIN)) {
429
		    result |= (1 << count);
430
		}
431
	    }
432
#elif defined(__BEOS__)
433
	    result = 1;		/* redundant, but simple */
434
#elif HAVE_SELECT
435
	    if ((mode & 2)
436
		&& (fd = sp->_mouse_fd) >= 0
437
		&& FD_ISSET(fd, &set))
438
		result |= 2;
439
	    if ((mode & 1)
440
		&& FD_ISSET(sp->_ifd, &set))
441
		result |= 1;
442
#endif
443
	} else
444
	    result = 0;
445
    }
446
#ifdef NCURSES_WGETCH_EVENTS
447
    if ((mode & 4) && evl && evl->result_flags)
448
	result |= 4;
449
#endif
450
451
    return (result);
452
}