release/src/router/libncurses/ncurses/tty/lib_twait.c

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  28
  29 /****************************************************************************
  30  *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
  31  *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
  32  *     and: Thomas E. Dickey                        1996-on                 *
  33  ****************************************************************************/
  34
  35 /*
  36 **      lib_twait.c
  37 **
  38 **      The routine _nc_timed_wait().
  39 **
  40 **      (This file was originally written by Eric Raymond; however except for
  41 **      comments, none of the original code remains - T.Dickey).
  42 */
  43
  44 #include <curses.priv.h>
  45
  46 #if defined __HAIKU__ && defined __BEOS__
  47 #undef __BEOS__
  48 #endif
  49
  50 #ifdef __BEOS__
  51 #undef false
  52 #undef true
  53 #include <OS.h>
  54 #endif
  55
  56 #if USE_KLIBC_KBD
  57 #define INCL_KBD
  58 #include <os2.h>
  59 #endif
  60
  61 #if USE_FUNC_POLL
  62 # if HAVE_SYS_TIME_H
  63 #  include <sys/time.h>
  64 # endif
  65 #elif HAVE_SELECT
  66 # if HAVE_SYS_TIME_H && HAVE_SYS_TIME_SELECT
  67 #  include <sys/time.h>
  68 # endif
  69 # if HAVE_SYS_SELECT_H
  70 #  include <sys/select.h>
  71 # endif
  72 #endif
  73 #ifdef __MINGW32__
  74 #  include <sys/time.h>
  75 #endif
  76 #undef CUR
  77
  78 MODULE_ID("$Id: lib_twait.c,v 1.70 2015/07/04 21:01:02 tom Exp $")
  79
  80 static long
  81 _nc_gettime(TimeType * t0, int first)
  82 {
  83     long res;
  84
  85 #if PRECISE_GETTIME
  86     TimeType t1;
  87     gettimeofday(&t1, (struct timezone *) 0);
  88     if (first) {
  89         *t0 = t1;
  90         res = 0;
  91     } else {
  92         /* .tv_sec and .tv_usec are unsigned, be careful when subtracting */
  93         if (t0->tv_usec > t1.tv_usec) {
  94             t1.tv_usec += 1000000;      /* Convert 1s in 1e6 microsecs */
  95             t1.tv_sec--;
  96         }
  97         res = (t1.tv_sec - t0->tv_sec) * 1000
  98             + (t1.tv_usec - t0->tv_usec) / 1000;
  99     }
 100 #else
 101     time_t t1 = time((time_t *) 0);
 102     if (first) {
 103         *t0 = t1;
 104     }
 105     res = (long) ((t1 - *t0) * 1000);
 106 #endif
 107     TR(TRACE_IEVENT, ("%s time: %ld msec", first ? "get" : "elapsed", res));
 108     return res;
 109 }
 110
 111 #ifdef NCURSES_WGETCH_EVENTS
 112 NCURSES_EXPORT(int)
 113 _nc_eventlist_timeout(_nc_eventlist * evl)
 114 {
 115     int event_delay = -1;
 116     int n;
 117
 118     if (evl != 0) {
 119
 120         for (n = 0; n < evl->count; ++n) {
 121             _nc_event *ev = evl->events[n];
 122
 123             if (ev->type == _NC_EVENT_TIMEOUT_MSEC) {
 124                 event_delay = (int) ev->data.timeout_msec;
 125                 if (event_delay < 0)
 126                     event_delay = INT_MAX;      /* FIXME Is this defined? */
 127             }
 128         }
 129     }
 130     return event_delay;
 131 }
 132 #endif /* NCURSES_WGETCH_EVENTS */
 133
 134 #if (USE_FUNC_POLL || HAVE_SELECT)
 135 #  define MAYBE_UNUSED
 136 #else
 137 #  define MAYBE_UNUSED GCC_UNUSED
 138 #endif
 139
 140 #if (USE_FUNC_POLL || HAVE_SELECT)
 141 #  define MAYBE_UNUSED
 142 #else
 143 #  define MAYBE_UNUSED GCC_UNUSED
 144 #endif
 145
 146 /*
 147  * Wait a specified number of milliseconds, returning nonzero if the timer
 148  * didn't expire before there is activity on the specified file descriptors.
 149  * The file-descriptors are specified by the mode:
 150  *      TW_NONE    0 - none (absolute time)
 151  *      TW_INPUT   1 - ncurses' normal input-descriptor
 152  *      TW_MOUSE   2 - mouse descriptor, if any
 153  *      TW_ANY     3 - either input or mouse.
 154  *      TW_EVENT   4 -
 155  * Experimental:  if NCURSES_WGETCH_EVENTS is defined, (mode & 4) determines
 156  * whether to pay attention to evl argument.  If set, the smallest of
 157  * millisecond and of timeout of evl is taken.
 158  *
 159  * We return a mask that corresponds to the mode (e.g., 2 for mouse activity).
 160  *
 161  * If the milliseconds given are -1, the wait blocks until activity on the
 162  * descriptors.
 163  */
 164 NCURSES_EXPORT(int)
 165 _nc_timed_wait(SCREEN *sp MAYBE_UNUSED,
 166                int mode MAYBE_UNUSED,
 167                int milliseconds,
 168                int *timeleft
 169                EVENTLIST_2nd(_nc_eventlist * evl))
 170 {
 171     int count;
 172     int result = TW_NONE;
 173     TimeType t0;
 174 #if (USE_FUNC_POLL || HAVE_SELECT)
 175     int fd;
 176 #endif
 177
 178 #ifdef NCURSES_WGETCH_EVENTS
 179     int timeout_is_event = 0;
 180     int n;
 181 #endif
 182
 183 #if USE_FUNC_POLL
 184 #define MIN_FDS 2
 185     struct pollfd fd_list[MIN_FDS];
 186     struct pollfd *fds = fd_list;
 187 #elif defined(__BEOS__)
 188 #elif HAVE_SELECT
 189     fd_set set;
 190 #endif
 191
 192 #if USE_KLIBC_KBD
 193     fd_set saved_set;
 194     KBDKEYINFO ki;
 195     struct timeval tv;
 196 #endif
 197
 198     long starttime, returntime;
 199
 200     TR(TRACE_IEVENT, ("start twait: %d milliseconds, mode: %d",
 201                       milliseconds, mode));
 202
 203 #ifdef NCURSES_WGETCH_EVENTS
 204     if (mode & TW_EVENT) {
 205         int event_delay = _nc_eventlist_timeout(evl);
 206
 207         if (event_delay >= 0
 208             && (milliseconds >= event_delay || milliseconds < 0)) {
 209             milliseconds = event_delay;
 210             timeout_is_event = 1;
 211         }
 212     }
 213 #endif
 214
 215 #if PRECISE_GETTIME && HAVE_NANOSLEEP
 216   retry:
 217 #endif
 218     starttime = _nc_gettime(&t0, TRUE);
 219
 220     count = 0;
 221     (void) count;
 222
 223 #ifdef NCURSES_WGETCH_EVENTS
 224     if ((mode & TW_EVENT) && evl)
 225         evl->result_flags = 0;
 226 #endif
 227
 228 #if USE_FUNC_POLL
 229     memset(fd_list, 0, sizeof(fd_list));
 230
 231 #ifdef NCURSES_WGETCH_EVENTS
 232     if ((mode & TW_EVENT) && evl) {
 233         if (fds == fd_list)
 234             fds = typeMalloc(struct pollfd, MIN_FDS + evl->count);
 235         if (fds == 0)
 236             return TW_NONE;
 237     }
 238 #endif
 239
 240     if (mode & TW_INPUT) {
 241         fds[count].fd = sp->_ifd;
 242         fds[count].events = POLLIN;
 243         count++;
 244     }
 245     if ((mode & TW_MOUSE)
 246         && (fd = sp->_mouse_fd) >= 0) {
 247         fds[count].fd = fd;
 248         fds[count].events = POLLIN;
 249         count++;
 250     }
 251 #ifdef NCURSES_WGETCH_EVENTS
 252     if ((mode & TW_EVENT) && evl) {
 253         for (n = 0; n < evl->count; ++n) {
 254             _nc_event *ev = evl->events[n];
 255
 256             if (ev->type == _NC_EVENT_FILE
 257                 && (ev->data.fev.flags & _NC_EVENT_FILE_READABLE)) {
 258                 fds[count].fd = ev->data.fev.fd;
 259                 fds[count].events = POLLIN;
 260                 count++;
 261             }
 262         }
 263     }
 264 #endif
 265
 266     result = poll(fds, (size_t) count, milliseconds);
 267
 268 #ifdef NCURSES_WGETCH_EVENTS
 269     if ((mode & TW_EVENT) && evl) {
 270         int c;
 271
 272         if (!result)
 273             count = 0;
 274
 275         for (n = 0; n < evl->count; ++n) {
 276             _nc_event *ev = evl->events[n];
 277
 278             if (ev->type == _NC_EVENT_FILE
 279                 && (ev->data.fev.flags & _NC_EVENT_FILE_READABLE)) {
 280                 ev->data.fev.result = 0;
 281                 for (c = 0; c < count; c++)
 282                     if (fds[c].fd == ev->data.fev.fd
 283                         && fds[c].revents & POLLIN) {
 284                         ev->data.fev.result |= _NC_EVENT_FILE_READABLE;
 285                         evl->result_flags |= _NC_EVENT_FILE_READABLE;
 286                     }
 287             } else if (ev->type == _NC_EVENT_TIMEOUT_MSEC
 288                        && !result && timeout_is_event) {
 289                 evl->result_flags |= _NC_EVENT_TIMEOUT_MSEC;
 290             }
 291         }
 292     }
 293 #endif
 294
 295 #elif defined(__BEOS__)
 296     /*
 297      * BeOS's select() is declared in socket.h, so the configure script does
 298      * not see it.  That's just as well, since that function works only for
 299      * sockets.  This (using snooze and ioctl) was distilled from Be's patch
 300      * for ncurses which uses a separate thread to simulate select().
 301      *
 302      * FIXME: the return values from the ioctl aren't very clear if we get
 303      * interrupted.
 304      *
 305      * FIXME: this assumes mode&1 if milliseconds < 0 (see lib_getch.c).
 306      */
 307     result = TW_NONE;
 308     if (mode & TW_INPUT) {
 309         int step = (milliseconds < 0) ? 0 : 5000;
 310         bigtime_t d;
 311         bigtime_t useconds = milliseconds * 1000;
 312         int n, howmany;
 313
 314         if (useconds <= 0)      /* we're here to go _through_ the loop */
 315             useconds = 1;
 316
 317         for (d = 0; d < useconds; d += step) {
 318             n = 0;
 319             howmany = ioctl(0, 'ichr', &n);
 320             if (howmany >= 0 && n > 0) {
 321                 result = 1;
 322                 break;
 323             }
 324             if (useconds > 1 && step > 0) {
 325                 snooze(step);
 326                 milliseconds -= (step / 1000);
 327                 if (milliseconds <= 0) {
 328                     milliseconds = 0;
 329                     break;
 330                 }
 331             }
 332         }
 333     } else if (milliseconds > 0) {
 334         snooze(milliseconds * 1000);
 335         milliseconds = 0;
 336     }
 337 #elif HAVE_SELECT
 338     /*
 339      * select() modifies the fd_set arguments; do this in the
 340      * loop.
 341      */
 342     FD_ZERO(&set);
 343
 344 #if !USE_KLIBC_KBD
 345     if (mode & TW_INPUT) {
 346         FD_SET(sp->_ifd, &set);
 347         count = sp->_ifd + 1;
 348     }
 349 #endif
 350     if ((mode & TW_MOUSE)
 351         && (fd = sp->_mouse_fd) >= 0) {
 352         FD_SET(fd, &set);
 353         count = max(fd, count) + 1;
 354     }
 355 #ifdef NCURSES_WGETCH_EVENTS
 356     if ((mode & TW_EVENT) && evl) {
 357         for (n = 0; n < evl->count; ++n) {
 358             _nc_event *ev = evl->events[n];
 359
 360             if (ev->type == _NC_EVENT_FILE
 361                 && (ev->data.fev.flags & _NC_EVENT_FILE_READABLE)) {
 362                 FD_SET(ev->data.fev.fd, &set);
 363                 count = max(ev->data.fev.fd + 1, count);
 364             }
 365         }
 366     }
 367 #endif
 368
 369 #if USE_KLIBC_KBD
 370     for (saved_set = set;; set = saved_set) {
 371         if ((mode & TW_INPUT)
 372             && (sp->_extended_key
 373                 || (KbdPeek(&ki, 0) == 0
 374                     && (ki.fbStatus & KBDTRF_FINAL_CHAR_IN)))) {
 375             FD_ZERO(&set);
 376             FD_SET(sp->_ifd, &set);
 377             result = 1;
 378             break;
 379         }
 380
 381         tv.tv_sec = 0;
 382         tv.tv_usec = (milliseconds == 0) ? 0 : (10 * 1000);
 383
 384         if ((result = select(count, &set, NULL, NULL, &tv)) != 0)
 385             break;
 386
 387         /* Time out ? */
 388         if (milliseconds >= 0 && _nc_gettime(&t0, FALSE) >= milliseconds) {
 389             result = 0;
 390             break;
 391         }
 392     }
 393 #else
 394     if (milliseconds >= 0) {
 395         struct timeval ntimeout;
 396         ntimeout.tv_sec = milliseconds / 1000;
 397         ntimeout.tv_usec = (milliseconds % 1000) * 1000;
 398         result = select(count, &set, NULL, NULL, &ntimeout);
 399     } else {
 400         result = select(count, &set, NULL, NULL, NULL);
 401     }
 402 #endif
 403
 404 #ifdef NCURSES_WGETCH_EVENTS
 405     if ((mode & TW_EVENT) && evl) {
 406         evl->result_flags = 0;
 407         for (n = 0; n < evl->count; ++n) {
 408             _nc_event *ev = evl->events[n];
 409
 410             if (ev->type == _NC_EVENT_FILE
 411                 && (ev->data.fev.flags & _NC_EVENT_FILE_READABLE)) {
 412                 ev->data.fev.result = 0;
 413                 if (FD_ISSET(ev->data.fev.fd, &set)) {
 414                     ev->data.fev.result |= _NC_EVENT_FILE_READABLE;
 415                     evl->result_flags |= _NC_EVENT_FILE_READABLE;
 416                 }
 417             } else if (ev->type == _NC_EVENT_TIMEOUT_MSEC
 418                        && !result && timeout_is_event)
 419                 evl->result_flags |= _NC_EVENT_TIMEOUT_MSEC;
 420         }
 421     }
 422 #endif
 423
 424 #endif /* USE_FUNC_POLL, etc */
 425
 426     returntime = _nc_gettime(&t0, FALSE);
 427
 428     if (milliseconds >= 0)
 429         milliseconds -= (int) (returntime - starttime);
 430
 431 #ifdef NCURSES_WGETCH_EVENTS
 432     if (evl) {
 433         evl->result_flags = 0;
 434         for (n = 0; n < evl->count; ++n) {
 435             _nc_event *ev = evl->events[n];
 436
 437             if (ev->type == _NC_EVENT_TIMEOUT_MSEC) {
 438                 long diff = (returntime - starttime);
 439                 if (ev->data.timeout_msec <= diff)
 440                     ev->data.timeout_msec = 0;
 441                 else
 442                     ev->data.timeout_msec -= diff;
 443             }
 444
 445         }
 446     }
 447 #endif
 448
 449 #if PRECISE_GETTIME && HAVE_NANOSLEEP
 450     /*
 451      * If the timeout hasn't expired, and we've gotten no data,
 452      * this is probably a system where 'select()' needs to be left
 453      * alone so that it can complete.  Make this process sleep,
 454      * then come back for more.
 455      */
 456     if (result == 0 && milliseconds > 100) {
 457         napms(100);             /* FIXME: this won't be right if I recur! */
 458         milliseconds -= 100;
 459         goto retry;
 460     }
 461 #endif
 462
 463     /* return approximate time left in milliseconds */
 464     if (timeleft)
 465         *timeleft = milliseconds;
 466
 467     TR(TRACE_IEVENT, ("end twait: returned %d (%d), remaining time %d msec",
 468                       result, errno, milliseconds));
 469
 470     /*
 471      * Both 'poll()' and 'select()' return the number of file descriptors
 472      * that are active.  Translate this back to the mask that denotes which
 473      * file-descriptors, so that we don't need all of this system-specific
 474      * code everywhere.
 475      */
 476     if (result != 0) {
 477         if (result > 0) {
 478             result = 0;
 479 #if USE_FUNC_POLL
 480             for (count = 0; count < MIN_FDS; count++) {
 481                 if ((mode & (1 << count))
 482                     && (fds[count].revents & POLLIN)) {
 483                     result |= (1 << count);
 484                 }
 485             }
 486 #elif defined(__BEOS__)
 487             result = TW_INPUT;  /* redundant, but simple */
 488 #elif HAVE_SELECT
 489             if ((mode & TW_MOUSE)
 490                 && (fd = sp->_mouse_fd) >= 0
 491                 && FD_ISSET(fd, &set))
 492                 result |= TW_MOUSE;
 493             if ((mode & TW_INPUT)
 494                 && FD_ISSET(sp->_ifd, &set))
 495                 result |= TW_INPUT;
 496 #endif
 497         } else
 498             result = 0;
 499     }
 500 #ifdef NCURSES_WGETCH_EVENTS
 501     if ((mode & TW_EVENT) && evl && evl->result_flags)
 502         result |= TW_EVENT;
 503 #endif
 504
 505 #if USE_FUNC_POLL
 506 #ifdef NCURSES_WGETCH_EVENTS
 507     if (fds != fd_list)
 508         free((char *) fds);
 509 #endif
 510 #endif
 511
 512     return (result);
 513 }