1 /****************************************************************************
2 * Copyright (c) 1998 Free Software Foundation, Inc. *
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5 * copy of this software and associated documentation files (the *
6 * "Software"), to deal in the Software without restriction, including *
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9 * copies of the Software, and to permit persons to whom the Software is *
10 * furnished to do so, subject to the following conditions: *
12 * The above copyright notice and this permission notice shall be included *
13 * in all copies or substantial portions of the Software. *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
16 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
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27 ****************************************************************************/
29 /****************************************************************************
30 * Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 *
31 * and: Eric S. Raymond <esr@snark.thyrsus.com> *
32 ****************************************************************************/
37 ** The routine _nc_timed_wait().
39 ** (This file was originally written by Eric Raymond; however except for
40 ** comments, none of the original code remains - T.Dickey).
47 #include <curses.priv.h>
53 # include <sys/time.h>
56 # if HAVE_SYS_TIME_H && HAVE_SYS_TIME_SELECT
57 # include <sys/time.h>
59 # if HAVE_SYS_SELECT_H
60 # include <sys/select.h>
64 MODULE_ID("$Id: lib_twait.c,v 1.34 1999/10/16 21:25:10 tom Exp $")
66 static long _nc_gettime(bool first)
71 # define PRECISE_GETTIME 1
72 static struct timeval t0;
74 gettimeofday(&t1, (struct timezone *)0);
78 res = (t1.tv_sec - t0.tv_sec) * 1000
79 + (t1.tv_usec - t0.tv_usec) / 1000;
81 # define PRECISE_GETTIME 0
83 time_t t1 = time((time_t*)0);
87 res = (t1 - t0) * 1000;
89 T(("%s time: %ld msec", first ? "get" : "elapsed", res));
94 * Wait a specified number of milliseconds, returning nonzero if the timer
95 * didn't expire before there is activity on the specified file descriptors.
96 * The file-descriptors are specified by the mode:
97 * 0 - none (absolute time)
98 * 1 - ncurses' normal input-descriptor
99 * 2 - mouse descriptor, if any
100 * 3 - either input or mouse.
101 * We return a mask that corresponds to the mode (e.g., 2 for mouse activity).
103 * If the milliseconds given are -1, the wait blocks until activity on the
106 int _nc_timed_wait(int mode, int milliseconds, int *timeleft)
114 struct pollfd fds[2];
115 #elif defined(__BEOS__)
120 long starttime, returntime;
122 T(("start twait: %d milliseconds, mode: %d", milliseconds, mode));
127 starttime = _nc_gettime(TRUE);
133 fds[count].fd = SP->_ifd;
134 fds[count].events = POLLIN;
138 && (fd = SP->_mouse_fd) >= 0) {
140 fds[count].events = POLLIN;
143 result = poll(fds, count, milliseconds);
145 #elif defined(__BEOS__)
147 * BeOS's select() is declared in socket.h, so the configure script does
148 * not see it. That's just as well, since that function works only for
149 * sockets. This (using snooze and ioctl) was distilled from Be's patch
150 * for ncurses which uses a separate thread to simulate select().
152 * FIXME: the return values from the ioctl aren't very clear if we get
158 bigtime_t useconds = milliseconds * 1000;
161 if (useconds == 0) /* we're here to go _through_ the loop */
164 for (d = 0; d < useconds; d += 5000) {
166 howmany = ioctl(0, 'ichr', &n);
167 if (howmany >= 0 && n > 0) {
175 } else if (milliseconds > 0) {
176 snooze(milliseconds * 1000);
181 * select() modifies the fd_set arguments; do this in the
187 FD_SET(SP->_ifd, &set);
188 count = SP->_ifd + 1;
191 && (fd = SP->_mouse_fd) >= 0) {
193 count = max(fd, count) + 1;
196 if (milliseconds >= 0) {
197 struct timeval ntimeout;
198 ntimeout.tv_sec = milliseconds / 1000;
199 ntimeout.tv_usec = (milliseconds % 1000) * 1000;
200 result = select(count, &set, NULL, NULL, &ntimeout);
202 result = select(count, &set, NULL, NULL, NULL);
206 returntime = _nc_gettime(FALSE);
208 if (milliseconds >= 0)
209 milliseconds -= (returntime - starttime);
213 * If the timeout hasn't expired, and we've gotten no data,
214 * this is probably a system where 'select()' needs to be left
215 * alone so that it can complete. Make this process sleep,
216 * then come back for more.
218 if (result == 0 && milliseconds > 100) {
225 /* return approximate time left in milliseconds */
227 *timeleft = milliseconds;
229 T(("end twait: returned %d (%d), remaining time %d msec",
230 result, errno, milliseconds));
233 * Both 'poll()' and 'select()' return the number of file descriptors
234 * that are active. Translate this back to the mask that denotes which
235 * file-descriptors, so that we don't need all of this system-specific
242 for (count = 0; count < 2; count++) {
243 if ((mode & (1 << count))
244 && (fds[count].revents & POLLIN)) {
245 result |= (1 << count);
249 #elif defined(__BEOS__)
250 result = 1; /* redundant, but simple */
253 && (fd = SP->_mouse_fd) >= 0
254 && FD_ISSET(fd, &set))
257 && FD_ISSET(SP->_ifd, &set))