/**************************************************************************** * Copyright (c) 1998,1999,2000,2001 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("$Id: lib_twait.c,v 1.1.1.1 2001/11/29 20:40:58 jevans 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 TR(TRACE_IEVENT, ("%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; #endif long starttime, returntime; if (milliseconds < 0) milliseconds = 0; TR(TRACE_IEVENT, ("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 /* * select() modifies the fd_set arguments; do this in the * loop. */ FD_ZERO(&set); if (mode & 1) { FD_SET(SP->_ifd, &set); count = SP->_ifd + 1; } if ((mode & 2) && (fd = SP->_mouse_fd) >= 0) { FD_SET(fd, &set); count = max(fd, count) + 1; } 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); } #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; 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 < 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); }