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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>
51 # include <sys/time.h>
54 # if HAVE_SYS_TIME_H && HAVE_SYS_TIME_SELECT
55 # include <sys/time.h>
57 # if HAVE_SYS_SELECT_H
58 # include <sys/select.h>
62 MODULE_ID("$Id: lib_twait.c,v 1.37 2000/06/29 23:03:09 tom Exp $")
64 static long _nc_gettime(bool first)
69 # define PRECISE_GETTIME 1
70 static struct timeval t0;
72 gettimeofday(&t1, (struct timezone *)0);
76 res = (t1.tv_sec - t0.tv_sec) * 1000
77 + (t1.tv_usec - t0.tv_usec) / 1000;
79 # define PRECISE_GETTIME 0
81 time_t t1 = time((time_t*)0);
85 res = (t1 - t0) * 1000;
87 T(("%s time: %ld msec", first ? "get" : "elapsed", res));
92 * Wait a specified number of milliseconds, returning nonzero if the timer
93 * didn't expire before there is activity on the specified file descriptors.
94 * The file-descriptors are specified by the mode:
95 * 0 - none (absolute time)
96 * 1 - ncurses' normal input-descriptor
97 * 2 - mouse descriptor, if any
98 * 3 - either input or mouse.
99 * We return a mask that corresponds to the mode (e.g., 2 for mouse activity).
101 * If the milliseconds given are -1, the wait blocks until activity on the
104 int _nc_timed_wait(int mode, int milliseconds, int *timeleft)
112 struct pollfd fds[2];
113 #elif defined(__BEOS__)
118 long starttime, returntime;
120 T(("start twait: %d milliseconds, mode: %d", milliseconds, mode));
125 starttime = _nc_gettime(TRUE);
131 fds[count].fd = SP->_ifd;
132 fds[count].events = POLLIN;
136 && (fd = SP->_mouse_fd) >= 0) {
138 fds[count].events = POLLIN;
141 result = poll(fds, count, milliseconds);
143 #elif defined(__BEOS__)
145 * BeOS's select() is declared in socket.h, so the configure script does
146 * not see it. That's just as well, since that function works only for
147 * sockets. This (using snooze and ioctl) was distilled from Be's patch
148 * for ncurses which uses a separate thread to simulate select().
150 * FIXME: the return values from the ioctl aren't very clear if we get
156 bigtime_t useconds = milliseconds * 1000;
159 if (useconds == 0) /* we're here to go _through_ the loop */
162 for (d = 0; d < useconds; d += 5000) {
164 howmany = ioctl(0, 'ichr', &n);
165 if (howmany >= 0 && n > 0) {
173 } else if (milliseconds > 0) {
174 snooze(milliseconds * 1000);
179 * select() modifies the fd_set arguments; do this in the
185 FD_SET(SP->_ifd, &set);
186 count = SP->_ifd + 1;
189 && (fd = SP->_mouse_fd) >= 0) {
191 count = max(fd, count) + 1;
194 if (milliseconds >= 0) {
195 struct timeval ntimeout;
196 ntimeout.tv_sec = milliseconds / 1000;
197 ntimeout.tv_usec = (milliseconds % 1000) * 1000;
198 result = select(count, &set, NULL, NULL, &ntimeout);
200 result = select(count, &set, NULL, NULL, NULL);
204 returntime = _nc_gettime(FALSE);
206 if (milliseconds >= 0)
207 milliseconds -= (returntime - starttime);
211 * If the timeout hasn't expired, and we've gotten no data,
212 * this is probably a system where 'select()' needs to be left
213 * alone so that it can complete. Make this process sleep,
214 * then come back for more.
216 if (result == 0 && milliseconds > 100) {
223 /* return approximate time left in milliseconds */
225 *timeleft = milliseconds;
227 T(("end twait: returned %d (%d), remaining time %d msec",
228 result, errno, milliseconds));
231 * Both 'poll()' and 'select()' return the number of file descriptors
232 * that are active. Translate this back to the mask that denotes which
233 * file-descriptors, so that we don't need all of this system-specific
240 for (count = 0; count < 2; count++) {
241 if ((mode & (1 << count))
242 && (fds[count].revents & POLLIN)) {
243 result |= (1 << count);
246 #elif defined(__BEOS__)
247 result = 1; /* redundant, but simple */
250 && (fd = SP->_mouse_fd) >= 0
251 && FD_ISSET(fd, &set))
254 && FD_ISSET(SP->_ifd, &set))