subr_terminal.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2009 The FreeBSD Foundation
    5  * All rights reserved.
    6  *
    7  * This software was developed by Ed Schouten under sponsorship from the
    8  * FreeBSD Foundation.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 __FBSDID("$FreeBSD$");
   34 
   35 #include <sys/param.h>
   36 #include <sys/cons.h>
   37 #include <sys/consio.h>
   38 #include <sys/kernel.h>
   39 #include <sys/lock.h>
   40 #include <sys/malloc.h>
   41 #include <sys/mutex.h>
   42 #include <sys/systm.h>
   43 #include <sys/terminal.h>
   44 #include <sys/tty.h>
   45 
   46 #include <machine/stdarg.h>
   47 
   48 static MALLOC_DEFINE(M_TERMINAL, "terminal", "terminal device");
   49 
   50 /*
   51  * Locking.
   52  *
   53  * Normally we don't need to lock down the terminal emulator, because
   54  * the TTY lock is already held when calling teken_input().
   55  * Unfortunately this is not the case when the terminal acts as a
   56  * console device, because cnputc() can be called at the same time.
   57  * This means terminals may need to be locked down using a spin lock.
   58  */
   59 #define TERMINAL_LOCK(tm)       do {                                    \
   60         if ((tm)->tm_flags & TF_CONS)                                   \
   61                 mtx_lock_spin(&(tm)->tm_mtx);                           \
   62         else if ((tm)->tm_tty != NULL)                                  \
   63                 tty_lock((tm)->tm_tty);                                 \
   64 } while (0)
   65 #define TERMINAL_UNLOCK(tm)     do {                                    \
   66         if ((tm)->tm_flags & TF_CONS)                                   \
   67                 mtx_unlock_spin(&(tm)->tm_mtx);                         \
   68         else if ((tm)->tm_tty != NULL)                                  \
   69                 tty_unlock((tm)->tm_tty);                               \
   70 } while (0)
   71 #define TERMINAL_LOCK_TTY(tm)   do {                                    \
   72         if ((tm)->tm_flags & TF_CONS)                                   \
   73                 mtx_lock_spin(&(tm)->tm_mtx);                           \
   74 } while (0)
   75 #define TERMINAL_UNLOCK_TTY(tm) do {                                    \
   76         if ((tm)->tm_flags & TF_CONS)                                   \
   77                 mtx_unlock_spin(&(tm)->tm_mtx);                         \
   78 } while (0)
   79 #define TERMINAL_LOCK_CONS(tm)          mtx_lock_spin(&(tm)->tm_mtx)
   80 #define TERMINAL_UNLOCK_CONS(tm)        mtx_unlock_spin(&(tm)->tm_mtx)
   81 
   82 /*
   83  * TTY routines.
   84  */
   85 
   86 static tsw_open_t       termtty_open;
   87 static tsw_close_t      termtty_close;
   88 static tsw_outwakeup_t  termtty_outwakeup;
   89 static tsw_ioctl_t      termtty_ioctl;
   90 static tsw_mmap_t       termtty_mmap;
   91 
   92 static struct ttydevsw terminal_tty_class = {
   93         .tsw_open       = termtty_open,
   94         .tsw_close      = termtty_close,
   95         .tsw_outwakeup  = termtty_outwakeup,
   96         .tsw_ioctl      = termtty_ioctl,
   97         .tsw_mmap       = termtty_mmap,
   98 };
   99 
  100 /*
  101  * Terminal emulator routines.
  102  */
  103 
  104 static tf_bell_t        termteken_bell;
  105 static tf_cursor_t      termteken_cursor;
  106 static tf_putchar_t     termteken_putchar;
  107 static tf_fill_t        termteken_fill;
  108 static tf_copy_t        termteken_copy;
  109 static tf_pre_input_t   termteken_pre_input;
  110 static tf_post_input_t  termteken_post_input;
  111 static tf_param_t       termteken_param;
  112 static tf_respond_t     termteken_respond;
  113 
  114 static teken_funcs_t terminal_drawmethods = {
  115         .tf_bell        = termteken_bell,
  116         .tf_cursor      = termteken_cursor,
  117         .tf_putchar     = termteken_putchar,
  118         .tf_fill        = termteken_fill,
  119         .tf_copy        = termteken_copy,
  120         .tf_pre_input   = termteken_pre_input,
  121         .tf_post_input  = termteken_post_input,
  122         .tf_param       = termteken_param,
  123         .tf_respond     = termteken_respond,
  124 };
  125 
  126 /* Kernel message formatting. */
  127 static const teken_attr_t kernel_message = {
  128         .ta_fgcolor     = TCHAR_FGCOLOR(TERMINAL_KERN_ATTR),
  129         .ta_bgcolor     = TCHAR_BGCOLOR(TERMINAL_KERN_ATTR),
  130         .ta_format      = TCHAR_FORMAT(TERMINAL_KERN_ATTR)
  131 };
  132 
  133 static const teken_attr_t default_message = {
  134         .ta_fgcolor     = TCHAR_FGCOLOR(TERMINAL_NORM_ATTR),
  135         .ta_bgcolor     = TCHAR_BGCOLOR(TERMINAL_NORM_ATTR),
  136         .ta_format      = TCHAR_FORMAT(TERMINAL_NORM_ATTR)
  137 };
  138 
  139 /* Fudge fg brightness as TF_BOLD (shifted). */
  140 #define TCOLOR_FG_FUDGED(color) __extension__ ({                        \
  141         teken_color_t _c;                                               \
  142                                                                         \
  143         _c = (color);                                                   \
  144         TCOLOR_FG(_c & 7) | ((_c & 8) << 18);                           \
  145 })
  146 
  147 /* Fudge bg brightness as TF_BLINK (shifted). */
  148 #define TCOLOR_BG_FUDGED(color) __extension__ ({                        \
  149         teken_color_t _c;                                               \
  150                                                                         \
  151         _c = (color);                                                   \
  152         TCOLOR_BG(_c & 7) | ((_c & 8) << 20);                           \
  153 })
  154 
  155 #define TCOLOR_256TO16(color) __extension__ ({                          \
  156         teken_color_t _c;                                               \
  157                                                                         \
  158         _c = (color);                                                   \
  159         if (_c >= 16)                                                   \
  160                 _c = teken_256to16(_c);                                 \
  161         _c;                                                             \
  162 })
  163 
  164 #define TCHAR_CREATE(c, a)      ((c) | TFORMAT((a)->ta_format) |        \
  165         TCOLOR_FG_FUDGED(TCOLOR_256TO16((a)->ta_fgcolor)) |             \
  166         TCOLOR_BG_FUDGED(TCOLOR_256TO16((a)->ta_bgcolor)))
  167 
  168 static void
  169 terminal_init(struct terminal *tm)
  170 {
  171 
  172         if (tm->tm_flags & TF_CONS)
  173                 mtx_init(&tm->tm_mtx, "trmlck", NULL, MTX_SPIN);
  174         teken_init(&tm->tm_emulator, &terminal_drawmethods, tm);
  175         teken_set_defattr(&tm->tm_emulator, &default_message);
  176 }
  177 
  178 struct terminal *
  179 terminal_alloc(const struct terminal_class *tc, void *softc)
  180 {
  181         struct terminal *tm;
  182 
  183         tm = malloc(sizeof(struct terminal), M_TERMINAL, M_WAITOK|M_ZERO);
  184         terminal_init(tm);
  185 
  186         tm->tm_class = tc;
  187         tm->tm_softc = softc;
  188 
  189         return (tm);
  190 }
  191 
  192 static void
  193 terminal_sync_ttysize(struct terminal *tm)
  194 {
  195         struct tty *tp;
  196 
  197         tp = tm->tm_tty;
  198         if (tp == NULL)
  199                 return;
  200 
  201         tty_lock(tp);
  202         tty_set_winsize(tp, &tm->tm_winsize);
  203         tty_unlock(tp);
  204 }
  205 
  206 void
  207 terminal_maketty(struct terminal *tm, const char *fmt, ...)
  208 {
  209         struct tty *tp;
  210         char name[8];
  211         va_list ap;
  212 
  213         va_start(ap, fmt);
  214         vsnrprintf(name, sizeof name, 32, fmt, ap);
  215         va_end(ap);
  216 
  217         tp = tty_alloc(&terminal_tty_class, tm);
  218         tty_makedev(tp, NULL, "%s", name);
  219         tm->tm_tty = tp;
  220         terminal_sync_ttysize(tm);
  221 }
  222 
  223 void
  224 terminal_set_cursor(struct terminal *tm, const term_pos_t *pos)
  225 {
  226 
  227         teken_set_cursor(&tm->tm_emulator, pos);
  228 }
  229 
  230 void
  231 terminal_set_winsize_blank(struct terminal *tm, const struct winsize *size,
  232     int blank, const term_attr_t *attr)
  233 {
  234         term_rect_t r;
  235 
  236         tm->tm_winsize = *size;
  237 
  238         r.tr_begin.tp_row = r.tr_begin.tp_col = 0;
  239         r.tr_end.tp_row = size->ws_row;
  240         r.tr_end.tp_col = size->ws_col;
  241 
  242         TERMINAL_LOCK(tm);
  243         if (blank == 0)
  244                 teken_set_winsize_noreset(&tm->tm_emulator, &r.tr_end);
  245         else
  246                 teken_set_winsize(&tm->tm_emulator, &r.tr_end);
  247         TERMINAL_UNLOCK(tm);
  248 
  249         if ((blank != 0) && !(tm->tm_flags & TF_MUTE))
  250                 tm->tm_class->tc_fill(tm, &r,
  251                     TCHAR_CREATE((teken_char_t)' ', attr));
  252 
  253         terminal_sync_ttysize(tm);
  254 }
  255 
  256 void
  257 terminal_set_winsize(struct terminal *tm, const struct winsize *size)
  258 {
  259 
  260         terminal_set_winsize_blank(tm, size, 1,
  261             (const term_attr_t *)&default_message);
  262 }
  263 
  264 /*
  265  * XXX: This function is a kludge.  Drivers like vt(4) need to
  266  * temporarily stop input when resizing, etc.  This should ideally be
  267  * handled within the driver.
  268  */
  269 
  270 void
  271 terminal_mute(struct terminal *tm, int yes)
  272 {
  273 
  274         TERMINAL_LOCK(tm);
  275         if (yes)
  276                 tm->tm_flags |= TF_MUTE;
  277         else
  278                 tm->tm_flags &= ~TF_MUTE;
  279         TERMINAL_UNLOCK(tm);
  280 }
  281 
  282 void
  283 terminal_input_char(struct terminal *tm, term_char_t c)
  284 {
  285         struct tty *tp;
  286 
  287         tp = tm->tm_tty;
  288         if (tp == NULL)
  289                 return;
  290 
  291         /*
  292          * Strip off any attributes. Also ignore input of second part of
  293          * CJK fullwidth characters, as we don't want to return these
  294          * characters twice.
  295          */
  296         if (TCHAR_FORMAT(c) & TF_CJK_RIGHT)
  297                 return;
  298         c = TCHAR_CHARACTER(c);
  299 
  300         tty_lock(tp);
  301         /*
  302          * Conversion to UTF-8.
  303          */
  304         if (c < 0x80) {
  305                 ttydisc_rint(tp, c, 0);
  306         } else if (c < 0x800) {
  307                 char str[2] = {
  308                         0xc0 | (c >> 6),
  309                         0x80 | (c & 0x3f)
  310                 };
  311 
  312                 ttydisc_rint_simple(tp, str, sizeof str);
  313         } else if (c < 0x10000) {
  314                 char str[3] = {
  315                         0xe0 | (c >> 12),
  316                         0x80 | ((c >> 6) & 0x3f),
  317                         0x80 | (c & 0x3f)
  318                 };
  319 
  320                 ttydisc_rint_simple(tp, str, sizeof str);
  321         } else {
  322                 char str[4] = {
  323                         0xf0 | (c >> 18),
  324                         0x80 | ((c >> 12) & 0x3f),
  325                         0x80 | ((c >> 6) & 0x3f),
  326                         0x80 | (c & 0x3f)
  327                 };
  328 
  329                 ttydisc_rint_simple(tp, str, sizeof str);
  330         }
  331         ttydisc_rint_done(tp);
  332         tty_unlock(tp);
  333 }
  334 
  335 void
  336 terminal_input_raw(struct terminal *tm, char c)
  337 {
  338         struct tty *tp;
  339 
  340         tp = tm->tm_tty;
  341         if (tp == NULL)
  342                 return;
  343 
  344         tty_lock(tp);
  345         ttydisc_rint(tp, c, 0);
  346         ttydisc_rint_done(tp);
  347         tty_unlock(tp);
  348 }
  349 
  350 void
  351 terminal_input_special(struct terminal *tm, unsigned int k)
  352 {
  353         struct tty *tp;
  354         const char *str;
  355 
  356         tp = tm->tm_tty;
  357         if (tp == NULL)
  358                 return;
  359 
  360         str = teken_get_sequence(&tm->tm_emulator, k);
  361         if (str == NULL)
  362                 return;
  363 
  364         tty_lock(tp);
  365         ttydisc_rint_simple(tp, str, strlen(str));
  366         ttydisc_rint_done(tp);
  367         tty_unlock(tp);
  368 }
  369 
  370 /*
  371  * Binding with the TTY layer.
  372  */
  373 
  374 static int
  375 termtty_open(struct tty *tp)
  376 {
  377         struct terminal *tm = tty_softc(tp);
  378 
  379         tm->tm_class->tc_opened(tm, 1);
  380         return (0);
  381 }
  382 
  383 static void
  384 termtty_close(struct tty *tp)
  385 {
  386         struct terminal *tm = tty_softc(tp);
  387 
  388         tm->tm_class->tc_opened(tm, 0);
  389 }
  390 
  391 static void
  392 termtty_outwakeup(struct tty *tp)
  393 {
  394         struct terminal *tm = tty_softc(tp);
  395         char obuf[128];
  396         size_t olen;
  397         unsigned int flags = 0;
  398 
  399         while ((olen = ttydisc_getc(tp, obuf, sizeof obuf)) > 0) {
  400                 TERMINAL_LOCK_TTY(tm);
  401                 if (!(tm->tm_flags & TF_MUTE)) {
  402                         tm->tm_flags &= ~TF_BELL;
  403                         teken_input(&tm->tm_emulator, obuf, olen);
  404                         flags |= tm->tm_flags;
  405                 }
  406                 TERMINAL_UNLOCK_TTY(tm);
  407         }
  408 
  409         TERMINAL_LOCK_TTY(tm);
  410         if (!(tm->tm_flags & TF_MUTE))
  411                 tm->tm_class->tc_done(tm);
  412         TERMINAL_UNLOCK_TTY(tm);
  413         if (flags & TF_BELL)
  414                 tm->tm_class->tc_bell(tm);
  415 }
  416 
  417 static int
  418 termtty_ioctl(struct tty *tp, u_long cmd, caddr_t data, struct thread *td)
  419 {
  420         struct terminal *tm = tty_softc(tp);
  421         int error;
  422 
  423         switch (cmd) {
  424         case CONS_GETINFO: {
  425                 vid_info_t *vi = (vid_info_t *)data;
  426                 const teken_pos_t *p;
  427                 int fg, bg;
  428 
  429                 if (vi->size != sizeof(vid_info_t))
  430                         return (EINVAL);
  431 
  432                 /* Already help the console driver by filling in some data. */
  433                 p = teken_get_cursor(&tm->tm_emulator);
  434                 vi->mv_row = p->tp_row;
  435                 vi->mv_col = p->tp_col;
  436 
  437                 p = teken_get_winsize(&tm->tm_emulator);
  438                 vi->mv_rsz = p->tp_row;
  439                 vi->mv_csz = p->tp_col;
  440 
  441                 teken_get_defattr_cons25(&tm->tm_emulator, &fg, &bg);
  442                 vi->mv_norm.fore = fg;
  443                 vi->mv_norm.back = bg;
  444                 /* XXX: keep vidcontrol happy; bold backgrounds. */
  445                 vi->mv_rev.fore = bg;
  446                 vi->mv_rev.back = fg & 0x7;
  447                 break;
  448         }
  449         }
  450 
  451         /*
  452          * Unlike various other drivers, this driver will never
  453          * deallocate TTYs.  This means it's safe to temporarily unlock
  454          * the TTY when handling ioctls.
  455          */
  456         tty_unlock(tp);
  457         error = tm->tm_class->tc_ioctl(tm, cmd, data, td);
  458         tty_lock(tp);
  459         return (error);
  460 }
  461 
  462 static int
  463 termtty_mmap(struct tty *tp, vm_ooffset_t offset, vm_paddr_t * paddr,
  464     int nprot, vm_memattr_t *memattr)
  465 {
  466         struct terminal *tm = tty_softc(tp);
  467 
  468         return (tm->tm_class->tc_mmap(tm, offset, paddr, nprot, memattr));
  469 }
  470 
  471 /*
  472  * Binding with the kernel and debug console.
  473  */
  474 
  475 static cn_probe_t       termcn_cnprobe;
  476 static cn_init_t        termcn_cninit;
  477 static cn_term_t        termcn_cnterm;
  478 static cn_getc_t        termcn_cngetc;
  479 static cn_putc_t        termcn_cnputc;
  480 static cn_grab_t        termcn_cngrab;
  481 static cn_ungrab_t      termcn_cnungrab;
  482 
  483 const struct consdev_ops termcn_cnops = {
  484         .cn_probe       = termcn_cnprobe,
  485         .cn_init        = termcn_cninit,
  486         .cn_term        = termcn_cnterm,
  487         .cn_getc        = termcn_cngetc,
  488         .cn_putc        = termcn_cnputc,
  489         .cn_grab        = termcn_cngrab,
  490         .cn_ungrab      = termcn_cnungrab,
  491 };
  492 
  493 void
  494 termcn_cnregister(struct terminal *tm)
  495 {
  496         struct consdev *cp;
  497 
  498         cp = tm->consdev;
  499         if (cp == NULL) {
  500                 cp = malloc(sizeof(struct consdev), M_TERMINAL,
  501                     M_WAITOK|M_ZERO);
  502                 cp->cn_ops = &termcn_cnops;
  503                 cp->cn_arg = tm;
  504                 cp->cn_pri = CN_INTERNAL;
  505                 sprintf(cp->cn_name, "ttyv0");
  506 
  507                 tm->tm_flags = TF_CONS;
  508                 tm->consdev = cp;
  509 
  510                 terminal_init(tm);
  511         }
  512 
  513         /* Attach terminal as console. */
  514         cnadd(cp);
  515 }
  516 
  517 static void
  518 termcn_cngrab(struct consdev *cp)
  519 {
  520         struct terminal *tm = cp->cn_arg;
  521 
  522         tm->tm_class->tc_cngrab(tm);
  523 }
  524 
  525 static void
  526 termcn_cnungrab(struct consdev *cp)
  527 {
  528         struct terminal *tm = cp->cn_arg;
  529 
  530         tm->tm_class->tc_cnungrab(tm);
  531 }
  532 
  533 static void
  534 termcn_cnprobe(struct consdev *cp)
  535 {
  536         struct terminal *tm = cp->cn_arg;
  537 
  538         if (tm == NULL) {
  539                 cp->cn_pri = CN_DEAD;
  540                 return;
  541         }
  542 
  543         tm->consdev = cp;
  544         terminal_init(tm);
  545 
  546         tm->tm_class->tc_cnprobe(tm, cp);
  547 }
  548 
  549 static void
  550 termcn_cninit(struct consdev *cp)
  551 {
  552 
  553 }
  554 
  555 static void
  556 termcn_cnterm(struct consdev *cp)
  557 {
  558 
  559 }
  560 
  561 static int
  562 termcn_cngetc(struct consdev *cp)
  563 {
  564         struct terminal *tm = cp->cn_arg;
  565 
  566         return (tm->tm_class->tc_cngetc(tm));
  567 }
  568 
  569 static void
  570 termcn_cnputc(struct consdev *cp, int c)
  571 {
  572         struct terminal *tm = cp->cn_arg;
  573         teken_attr_t backup;
  574         char cv = c;
  575 
  576         TERMINAL_LOCK_CONS(tm);
  577         if (!(tm->tm_flags & TF_MUTE)) {
  578                 backup = *teken_get_curattr(&tm->tm_emulator);
  579                 teken_set_curattr(&tm->tm_emulator, &kernel_message);
  580                 teken_input(&tm->tm_emulator, &cv, 1);
  581                 teken_set_curattr(&tm->tm_emulator, &backup);
  582                 tm->tm_class->tc_done(tm);
  583         }
  584         TERMINAL_UNLOCK_CONS(tm);
  585 }
  586 
  587 /*
  588  * Binding with the terminal emulator.
  589  */
  590 
  591 static void
  592 termteken_bell(void *softc)
  593 {
  594         struct terminal *tm = softc;
  595 
  596         tm->tm_flags |= TF_BELL;
  597 }
  598 
  599 static void
  600 termteken_cursor(void *softc, const teken_pos_t *p)
  601 {
  602         struct terminal *tm = softc;
  603 
  604         tm->tm_class->tc_cursor(tm, p);
  605 }
  606 
  607 static void
  608 termteken_putchar(void *softc, const teken_pos_t *p, teken_char_t c,
  609     const teken_attr_t *a)
  610 {
  611         struct terminal *tm = softc;
  612 
  613         tm->tm_class->tc_putchar(tm, p, TCHAR_CREATE(c, a));
  614 }
  615 
  616 static void
  617 termteken_fill(void *softc, const teken_rect_t *r, teken_char_t c,
  618     const teken_attr_t *a)
  619 {
  620         struct terminal *tm = softc;
  621 
  622         tm->tm_class->tc_fill(tm, r, TCHAR_CREATE(c, a));
  623 }
  624 
  625 static void
  626 termteken_copy(void *softc, const teken_rect_t *r, const teken_pos_t *p)
  627 {
  628         struct terminal *tm = softc;
  629 
  630         tm->tm_class->tc_copy(tm, r, p);
  631 }
  632 
  633 static void
  634 termteken_pre_input(void *softc)
  635 {
  636         struct terminal *tm = softc;
  637 
  638         tm->tm_class->tc_pre_input(tm);
  639 }
  640 
  641 static void
  642 termteken_post_input(void *softc)
  643 {
  644         struct terminal *tm = softc;
  645 
  646         tm->tm_class->tc_post_input(tm);
  647 }
  648 
  649 static void
  650 termteken_param(void *softc, int cmd, unsigned int arg)
  651 {
  652         struct terminal *tm = softc;
  653 
  654         tm->tm_class->tc_param(tm, cmd, arg);
  655 }
  656 
  657 static void
  658 termteken_respond(void *softc, const void *buf, size_t len)
  659 {
  660 #if 0
  661         struct terminal *tm = softc;
  662         struct tty *tp;
  663 
  664         /*
  665          * Only inject a response into the TTY if the data actually
  666          * originated from the TTY.
  667          *
  668          * XXX: This cannot be done right now.  The TTY could pick up
  669          * other locks.  It could also in theory cause loops, when the
  670          * TTY performs echoing of a command that generates even more
  671          * input.
  672          */
  673         tp = tm->tm_tty;
  674         if (tp == NULL)
  675                 return;
  676 
  677         ttydisc_rint_simple(tp, buf, len);
  678         ttydisc_rint_done(tp);
  679 #endif
  680 }
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FreeBSD/Linux Kernel Cross Reference sys/kern/subr_terminal.c

FreeBSD/Linux Kernel Cross Reference
sys/kern/subr_terminal.c
