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428
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1 /* The event_stream interface for tty's.
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2 Copyright (C) 1994, 1995 Board of Trustees, University of Illinois.
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3 Copyright (C) 1995 Sun Microsystems, Inc.
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1268
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4 Copyright (C) 1995, 2002, 2003 Ben Wing.
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428
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5
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6 This file is part of XEmacs.
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7
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8 XEmacs is free software; you can redistribute it and/or modify it
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9 under the terms of the GNU General Public License as published by the
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10 Free Software Foundation; either version 2, or (at your option) any
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11 later version.
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12
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13 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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16 for more details.
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17
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18 You should have received a copy of the GNU General Public License
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19 along with XEmacs; see the file COPYING. If not, write to
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20 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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21 Boston, MA 02111-1307, USA. */
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22
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23 /* Synched up with: Not in FSF. */
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24
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25 #include <config.h>
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26 #include "lisp.h"
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27
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28 #include "device.h"
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872
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29 #include "console-tty-impl.h"
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428
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30 #include "events.h"
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31 #include "frame.h"
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32 #include "process.h"
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33
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34 #include "sysproc.h"
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35 #include "syswait.h"
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36 #include "systime.h"
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37
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38 /* Mask of bits indicating the descriptors that we wait for input on */
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39 extern SELECT_TYPE input_wait_mask, non_fake_input_wait_mask;
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40 extern SELECT_TYPE process_only_mask, tty_only_mask;
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41
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42 static struct event_stream *tty_event_stream;
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43
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1292
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44 #ifdef WIN32_ANY
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45 extern int mswindows_is_blocking;
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46 #endif
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47
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428
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48
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49 /************************************************************************/
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50 /* timeout events */
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51 /************************************************************************/
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52
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53 /* The pending timers are stored in an ordered list, where the first timer
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54 on the list is the first one to fire. Times recorded here are
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55 absolute. */
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56 static struct low_level_timeout *tty_timer_queue;
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57
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58 static int
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59 emacs_tty_add_timeout (EMACS_TIME thyme)
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60 {
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61 return add_low_level_timeout (&tty_timer_queue, thyme);
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62 }
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63
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64 static void
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65 emacs_tty_remove_timeout (int id)
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66 {
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67 remove_low_level_timeout (&tty_timer_queue, id);
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68 }
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69
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70 static void
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440
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71 tty_timeout_to_emacs_event (Lisp_Event *emacs_event)
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428
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72 {
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934
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73 /* timeout events have nil as channel */
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74 SET_EVENT_TYPE (emacs_event, timeout_event);
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75 SET_EVENT_TIMESTAMP_ZERO (emacs_event); /* #### */
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1268
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76 SET_EVENT_TIMEOUT_INTERVAL_ID (emacs_event,
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77 pop_low_level_timeout (&tty_timer_queue, 0));
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1204
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78 SET_EVENT_TIMEOUT_FUNCTION (emacs_event, Qnil);
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79 SET_EVENT_TIMEOUT_OBJECT (emacs_event, Qnil);
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428
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80 }
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81
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82
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83
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84 static int
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1268
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85 emacs_tty_event_pending_p (int how_many)
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428
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86 {
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1268
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87 if (!how_many)
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428
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88 {
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89 EMACS_TIME sometime;
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90 /* see if there's a pending timeout. */
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91 EMACS_GET_TIME (sometime);
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92 if (tty_timer_queue &&
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93 EMACS_TIME_EQUAL_OR_GREATER (sometime, tty_timer_queue->time))
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94 return 1;
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1268
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95
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96 return poll_fds_for_input (non_fake_input_wait_mask);
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428
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97 }
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98
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1268
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99 /* #### Not right! We need to *count* the number of pending events, which
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100 means we need to have a dispatch queue and drain the pending events,
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101 using drain_tty_devices(). */
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102 return poll_fds_for_input (tty_only_mask);
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428
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103 }
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104
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105 static void
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440
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106 emacs_tty_next_event (Lisp_Event *emacs_event)
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428
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107 {
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108 while (1)
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109 {
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110 int ndesc;
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111 int i;
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112 SELECT_TYPE temp_mask = input_wait_mask;
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113 EMACS_TIME time_to_block;
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114 EMACS_SELECT_TIME select_time_to_block, *pointer_to_this;
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115
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3541
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116 if (!NILP (dispatch_event_queue))
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117 {
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118 Lisp_Object event, event2;
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119 event2 = wrap_event (emacs_event);
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120 event = dequeue_dispatch_event ();
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121 Fcopy_event (event, event2);
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122 Fdeallocate_event (event);
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123 return;
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124 }
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125
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428
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126 if (!get_low_level_timeout_interval (tty_timer_queue, &time_to_block))
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127 /* no timer events; block indefinitely */
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128 pointer_to_this = 0;
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129 else
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130 {
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131 EMACS_TIME_TO_SELECT_TIME (time_to_block, select_time_to_block);
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132 pointer_to_this = &select_time_to_block;
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133 }
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134
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1292
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135 #ifdef WIN32_ANY
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136 mswindows_is_blocking = 1;
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137 #endif
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428
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138 ndesc = select (MAXDESC, &temp_mask, 0, 0, pointer_to_this);
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1292
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139 #ifdef WIN32_ANY
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140 mswindows_is_blocking = 0;
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141 #endif
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428
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142 if (ndesc > 0)
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143 {
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144 /* Look for a TTY event */
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145 for (i = 0; i < MAXDESC; i++)
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146 {
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147 /* To avoid race conditions (among other things, an infinite
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148 loop when called from Fdiscard_input()), we must return
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149 user events ahead of process events. */
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150 if (FD_ISSET (i, &temp_mask) && FD_ISSET (i, &tty_only_mask))
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151 {
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1204
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152 struct console *c = find_tty_or_stream_console_from_fd (i);
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428
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153
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154 assert (c);
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771
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155 if (read_event_from_tty_or_stream_desc (emacs_event, c))
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428
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156 return;
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157 }
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158 }
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159
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160 /* Look for a process event */
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161 for (i = 0; i < MAXDESC; i++)
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162 {
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163 if (FD_ISSET (i, &temp_mask) && FD_ISSET (i, &process_only_mask))
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164 {
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165 Lisp_Object process;
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440
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166 Lisp_Process *p = get_process_from_usid (FD_TO_USID(i));
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428
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167
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168 assert (p);
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793
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169 process = wrap_process (p);
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934
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170 set_event_type (emacs_event, process_event);
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171 /* process events have nil as channel */
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172 SET_EVENT_TIMESTAMP_ZERO (emacs_event); /* #### */
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1204
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173 SET_EVENT_PROCESS_PROCESS (emacs_event, process);
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428
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174 return;
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175 }
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176 }
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177
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178 /* We might get here when a fake event came through a signal. */
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179 /* Return a dummy event, so that a cycle of the command loop will
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180 occur. */
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181 drain_signal_event_pipe ();
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934
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182 set_event_type (emacs_event, eval_event);
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183 /* eval events have nil as channel */
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1204
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184 SET_EVENT_EVAL_FUNCTION (emacs_event, Qidentity);
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185 SET_EVENT_EVAL_OBJECT (emacs_event, Qnil);
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428
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186 return;
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187 }
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188 else if (ndesc == 0) /* timeout fired */
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189 {
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190 tty_timeout_to_emacs_event (emacs_event);
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191 return;
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192 }
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193 }
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194 }
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195
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196 static void
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2286
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197 emacs_tty_format_magic_event (Lisp_Event *UNUSED (emacs_event),
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198 Lisp_Object UNUSED (pstream))
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788
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199 {
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200 /* Nothing to do currently */
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201 }
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202
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203 static int
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2286
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204 emacs_tty_compare_magic_event (Lisp_Event *UNUSED (e1),
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205 Lisp_Event *UNUSED (e2))
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788
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206 {
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207 return 1;
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208 }
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209
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210 static Hashcode
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2286
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211 emacs_tty_hash_magic_event (Lisp_Event *UNUSED (e))
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788
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212 {
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213 return 0;
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214 }
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215
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216 static void
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2286
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217 emacs_tty_handle_magic_event (Lisp_Event *UNUSED (emacs_event))
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428
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218 {
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219 /* Nothing to do currently */
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220 }
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221
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222
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223 static void
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853
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224 emacs_tty_select_process (Lisp_Process *process, int doin, int doerr)
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428
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225 {
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853
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226 int infd, errfd;
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227
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228 event_stream_unixoid_select_process (process, doin, doerr, &infd, &errfd);
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428
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229 }
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230
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231 static void
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853
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232 emacs_tty_unselect_process (Lisp_Process *process, int doin, int doerr)
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428
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233 {
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853
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234 int infd, errfd;
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235
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236 event_stream_unixoid_unselect_process (process, doin, doerr, &infd, &errfd);
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428
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237 }
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238
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239 static void
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240 emacs_tty_select_console (struct console *con)
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241 {
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242 event_stream_unixoid_select_console (con);
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243 }
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244
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245 static void
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246 emacs_tty_unselect_console (struct console *con)
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247 {
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248 event_stream_unixoid_unselect_console (con);
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249 }
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250
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251 static void
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1204
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252 emacs_tty_drain_queue (void)
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428
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253 {
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1204
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254 drain_tty_devices ();
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428
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255 }
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256
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853
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257 static void
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258 emacs_tty_create_io_streams (void* inhandle, void* outhandle,
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259 void *errhandle, Lisp_Object* instream,
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260 Lisp_Object* outstream,
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261 Lisp_Object* errstream,
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262 USID* in_usid,
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263 USID* err_usid,
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264 int flags)
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428
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265 {
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853
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266 event_stream_unixoid_create_io_streams
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267 (inhandle, outhandle, errhandle, instream, outstream,
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268 errstream, in_usid, err_usid, flags);
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428
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269 }
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270
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853
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271 static void
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272 emacs_tty_delete_io_streams (Lisp_Object instream,
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273 Lisp_Object outstream,
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274 Lisp_Object errstream,
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275 USID* in_usid,
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276 USID* err_usid)
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428
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277 {
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853
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278 event_stream_unixoid_delete_io_streams
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279 (instream, outstream, errstream, in_usid, err_usid);
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428
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280 }
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281
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282
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283 /************************************************************************/
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284 /* initialization */
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285 /************************************************************************/
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286
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287 void
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288 reinit_vars_of_event_tty (void)
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289 {
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1204
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290 tty_event_stream = xnew_and_zero (struct event_stream);
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428
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291
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292 tty_event_stream->event_pending_p = emacs_tty_event_pending_p;
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293 tty_event_stream->next_event_cb = emacs_tty_next_event;
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294 tty_event_stream->handle_magic_event_cb = emacs_tty_handle_magic_event;
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788
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295 tty_event_stream->format_magic_event_cb = emacs_tty_format_magic_event;
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296 tty_event_stream->compare_magic_event_cb= emacs_tty_compare_magic_event;
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297 tty_event_stream->hash_magic_event_cb = emacs_tty_hash_magic_event;
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428
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298 tty_event_stream->add_timeout_cb = emacs_tty_add_timeout;
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299 tty_event_stream->remove_timeout_cb = emacs_tty_remove_timeout;
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300 tty_event_stream->select_console_cb = emacs_tty_select_console;
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301 tty_event_stream->unselect_console_cb = emacs_tty_unselect_console;
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302 tty_event_stream->select_process_cb = emacs_tty_select_process;
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303 tty_event_stream->unselect_process_cb = emacs_tty_unselect_process;
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1204
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304 tty_event_stream->drain_queue_cb = emacs_tty_drain_queue;
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853
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305 tty_event_stream->create_io_streams_cb = emacs_tty_create_io_streams;
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306 tty_event_stream->delete_io_streams_cb = emacs_tty_delete_io_streams;
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428
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307 }
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308
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309 void
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310 vars_of_event_tty (void)
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311 {
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312 }
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313
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314 void
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315 init_event_tty_late (void)
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316 {
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317 event_stream = tty_event_stream;
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318 }
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