1 /**************************************************************************** 2 * Copyright (c) 1998,1999,2000 Free Software Foundation, Inc. * 3 * * 4 * Permission is hereby granted, free of charge, to any person obtaining a * 5 * copy of this software and associated documentation files (the * 6 * "Software"), to deal in the Software without restriction, including * 7 * without limitation the rights to use, copy, modify, merge, publish, * 8 * distribute, distribute with modifications, sublicense, and/or sell * 9 * copies of the Software, and to permit persons to whom the Software is * 10 * furnished to do so, subject to the following conditions: * 11 * * 12 * The above copyright notice and this permission notice shall be included * 13 * in all copies or substantial portions of the Software. * 14 * * 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. * 18 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * 19 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * 20 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * 21 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * 22 * * 23 * Except as contained in this notice, the name(s) of the above copyright * 24 * holders shall not be used in advertising or otherwise to promote the * 25 * sale, use or other dealings in this Software without prior written * 26 * authorization. * 27 ****************************************************************************/ 28 29 /**************************************************************************** 30 * Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 * 31 * and: Eric S. Raymond <esr@snark.thyrsus.com> * 32 ****************************************************************************/ 33 34 /* 35 ** lib_twait.c 36 ** 37 ** The routine _nc_timed_wait(). 38 ** 39 ** (This file was originally written by Eric Raymond; however except for 40 ** comments, none of the original code remains - T.Dickey). 41 */ 42 43 #ifdef __BEOS__ 44 #include <OS.h> 45 #endif 46 47 #include <curses.priv.h> 48 49 #if USE_FUNC_POLL 50 # if HAVE_SYS_TIME_H 51 # include <sys/time.h> 52 # endif 53 #elif HAVE_SELECT 54 # if HAVE_SYS_TIME_H && HAVE_SYS_TIME_SELECT 55 # include <sys/time.h> 56 # endif 57 # if HAVE_SYS_SELECT_H 58 # include <sys/select.h> 59 # endif 60 #endif 61 62 MODULE_ID("$Id: lib_twait.c,v 1.39 2000/08/26 19:34:15 tom Exp $") 63 64 static long 65 _nc_gettime(bool first) 66 { 67 long res; 68 69 #if HAVE_GETTIMEOFDAY 70 # define PRECISE_GETTIME 1 71 static struct timeval t0; 72 struct timeval t1; 73 gettimeofday(&t1, (struct timezone *) 0); 74 if (first) { 75 t0 = t1; 76 } 77 res = (t1.tv_sec - t0.tv_sec) * 1000 78 + (t1.tv_usec - t0.tv_usec) / 1000; 79 #else 80 # define PRECISE_GETTIME 0 81 static time_t t0; 82 time_t t1 = time((time_t *) 0); 83 if (first) { 84 t0 = t1; 85 } 86 res = (t1 - t0) * 1000; 87 #endif 88 T(("%s time: %ld msec", first ? "get" : "elapsed", res)); 89 return res; 90 } 91 92 /* 93 * Wait a specified number of milliseconds, returning nonzero if the timer 94 * didn't expire before there is activity on the specified file descriptors. 95 * The file-descriptors are specified by the mode: 96 * 0 - none (absolute time) 97 * 1 - ncurses' normal input-descriptor 98 * 2 - mouse descriptor, if any 99 * 3 - either input or mouse. 100 * We return a mask that corresponds to the mode (e.g., 2 for mouse activity). 101 * 102 * If the milliseconds given are -1, the wait blocks until activity on the 103 * descriptors. 104 */ 105 int 106 _nc_timed_wait(int mode, int milliseconds, int *timeleft) 107 { 108 int fd; 109 int count; 110 111 int result; 112 113 #if USE_FUNC_POLL 114 struct pollfd fds[2]; 115 #elif defined(__BEOS__) 116 #elif HAVE_SELECT 117 static fd_set set; 118 #endif 119 120 long starttime, returntime; 121 122 T(("start twait: %d milliseconds, mode: %d", milliseconds, mode)); 123 124 #if PRECISE_GETTIME 125 retry: 126 #endif 127 starttime = _nc_gettime(TRUE); 128 129 count = 0; 130 131 #if USE_FUNC_POLL 132 memset(fds, 0, sizeof(fds)); 133 if (mode & 1) { 134 fds[count].fd = SP->_ifd; 135 fds[count].events = POLLIN; 136 count++; 137 } 138 if ((mode & 2) 139 && (fd = SP->_mouse_fd) >= 0) { 140 fds[count].fd = fd; 141 fds[count].events = POLLIN; 142 count++; 143 } 144 result = poll(fds, count, milliseconds); 145 146 #elif defined(__BEOS__) 147 /* 148 * BeOS's select() is declared in socket.h, so the configure script does 149 * not see it. That's just as well, since that function works only for 150 * sockets. This (using snooze and ioctl) was distilled from Be's patch 151 * for ncurses which uses a separate thread to simulate select(). 152 * 153 * FIXME: the return values from the ioctl aren't very clear if we get 154 * interrupted. 155 */ 156 result = 0; 157 if (mode & 1) { 158 bigtime_t d; 159 bigtime_t useconds = milliseconds * 1000; 160 int n, howmany; 161 162 if (useconds == 0) /* we're here to go _through_ the loop */ 163 useconds = 1; 164 165 for (d = 0; d < useconds; d += 5000) { 166 n = 0; 167 howmany = ioctl(0, 'ichr', &n); 168 if (howmany >= 0 && n > 0) { 169 result = 1; 170 break; 171 } 172 if (useconds > 1) 173 snooze(5000); 174 milliseconds -= 5; 175 } 176 } else if (milliseconds > 0) { 177 snooze(milliseconds * 1000); 178 milliseconds = 0; 179 } 180 #elif HAVE_SELECT 181 /* 182 * select() modifies the fd_set arguments; do this in the 183 * loop. 184 */ 185 FD_ZERO(&set); 186 187 if (mode & 1) { 188 FD_SET(SP->_ifd, &set); 189 count = SP->_ifd + 1; 190 } 191 if ((mode & 2) 192 && (fd = SP->_mouse_fd) >= 0) { 193 FD_SET(fd, &set); 194 count = max(fd, count) + 1; 195 } 196 197 if (milliseconds >= 0) { 198 struct timeval ntimeout; 199 ntimeout.tv_sec = milliseconds / 1000; 200 ntimeout.tv_usec = (milliseconds % 1000) * 1000; 201 result = select(count, &set, NULL, NULL, &ntimeout); 202 } else { 203 result = select(count, &set, NULL, NULL, NULL); 204 } 205 #endif 206 207 returntime = _nc_gettime(FALSE); 208 209 if (milliseconds >= 0) 210 milliseconds -= (returntime - starttime); 211 212 #if PRECISE_GETTIME 213 /* 214 * If the timeout hasn't expired, and we've gotten no data, 215 * this is probably a system where 'select()' needs to be left 216 * alone so that it can complete. Make this process sleep, 217 * then come back for more. 218 */ 219 if (result == 0 && milliseconds > 100) { 220 napms(100); 221 milliseconds -= 100; 222 goto retry; 223 } 224 #endif 225 226 /* return approximate time left in milliseconds */ 227 if (timeleft) 228 *timeleft = milliseconds; 229 230 T(("end twait: returned %d (%d), remaining time %d msec", 231 result, errno, milliseconds)); 232 233 /* 234 * Both 'poll()' and 'select()' return the number of file descriptors 235 * that are active. Translate this back to the mask that denotes which 236 * file-descriptors, so that we don't need all of this system-specific 237 * code everywhere. 238 */ 239 if (result != 0) { 240 if (result > 0) { 241 result = 0; 242 #if USE_FUNC_POLL 243 for (count = 0; count < 2; count++) { 244 if ((mode & (1 << count)) 245 && (fds[count].revents & POLLIN)) { 246 result |= (1 << count); 247 } 248 } 249 #elif defined(__BEOS__) 250 result = 1; /* redundant, but simple */ 251 #elif HAVE_SELECT 252 if ((mode & 2) 253 && (fd = SP->_mouse_fd) >= 0 254 && FD_ISSET(fd, &set)) 255 result |= 2; 256 if ((mode & 1) 257 && FD_ISSET(SP->_ifd, &set)) 258 result |= 1; 259 #endif 260 } else 261 result = 0; 262 } 263 264 return (result); 265 } 266