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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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4 Copyright (C) 1995 Ben Wing.
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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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29 #include "console-tty.h"
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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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44
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45 /************************************************************************/
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46 /* timeout events */
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47 /************************************************************************/
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48
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49 /* The pending timers are stored in an ordered list, where the first timer
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50 on the list is the first one to fire. Times recorded here are
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51 absolute. */
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52 static struct low_level_timeout *tty_timer_queue;
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53
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54 static int
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55 emacs_tty_add_timeout (EMACS_TIME thyme)
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56 {
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57 return add_low_level_timeout (&tty_timer_queue, thyme);
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58 }
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59
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60 static void
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61 emacs_tty_remove_timeout (int id)
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62 {
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63 remove_low_level_timeout (&tty_timer_queue, id);
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64 }
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65
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66 static void
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67 tty_timeout_to_emacs_event (struct Lisp_Event *emacs_event)
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68 {
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69 emacs_event->event_type = timeout_event;
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70 /* timeout events have nil as channel */
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71 emacs_event->timestamp = 0; /* #### */
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72 emacs_event->event.timeout.interval_id =
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73 pop_low_level_timeout (&tty_timer_queue, 0);
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74 }
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75
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76
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77
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78 static int
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79 emacs_tty_event_pending_p (int user_p)
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80 {
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81 if (!user_p)
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82 {
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83 EMACS_TIME sometime;
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84 /* see if there's a pending timeout. */
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85 EMACS_GET_TIME (sometime);
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86 if (tty_timer_queue &&
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87 EMACS_TIME_EQUAL_OR_GREATER (sometime, tty_timer_queue->time))
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88 return 1;
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89 }
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90
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91 return poll_fds_for_input (user_p ? tty_only_mask :
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92 non_fake_input_wait_mask);
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93 }
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94
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95 static struct console *
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96 find_console_from_fd (int fd)
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97 {
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98 Lisp_Object concons;
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99
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100 CONSOLE_LOOP (concons)
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101 {
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102 struct console *c;
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103
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104 c = XCONSOLE (XCAR (concons));
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105 if (CONSOLE_TTY_P (c) && CONSOLE_TTY_DATA (c)->infd == fd)
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106 return c;
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107 }
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108
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109 return 0;
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110 }
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111
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112 static void
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113 emacs_tty_next_event (struct Lisp_Event *emacs_event)
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114 {
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115 while (1)
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116 {
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117 int ndesc;
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118 int i;
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119 SELECT_TYPE temp_mask = input_wait_mask;
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120 EMACS_TIME time_to_block;
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121 EMACS_SELECT_TIME select_time_to_block, *pointer_to_this;
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122
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123 if (!get_low_level_timeout_interval (tty_timer_queue, &time_to_block))
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124 /* no timer events; block indefinitely */
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125 pointer_to_this = 0;
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126 else
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127 {
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128 EMACS_TIME_TO_SELECT_TIME (time_to_block, select_time_to_block);
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129 pointer_to_this = &select_time_to_block;
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130 }
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131
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132 ndesc = select (MAXDESC, &temp_mask, 0, 0, pointer_to_this);
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133 if (ndesc > 0)
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134 {
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135 /* Look for a TTY event */
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136 for (i = 0; i < MAXDESC; i++)
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137 {
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138 /* To avoid race conditions (among other things, an infinite
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139 loop when called from Fdiscard_input()), we must return
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140 user events ahead of process events. */
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141 if (FD_ISSET (i, &temp_mask) && FD_ISSET (i, &tty_only_mask))
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142 {
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143 struct console *c = find_console_from_fd (i);
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185
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144
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0
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145 assert (c);
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146 if (read_event_from_tty_or_stream_desc (emacs_event, c, i))
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147 return;
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148 }
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149 }
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150
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151 /* Look for a process event */
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152 for (i = 0; i < MAXDESC; i++)
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153 {
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154 if (FD_ISSET (i, &temp_mask) && FD_ISSET (i, &process_only_mask))
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155 {
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156 Lisp_Object process;
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157 struct Lisp_Process *p =
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263
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158 get_process_from_usid (FD_TO_USID(i));
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185
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159
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0
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160 assert (p);
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161 XSETPROCESS (process, p);
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162 emacs_event->event_type = process_event;
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163 /* process events have nil as channel */
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164 emacs_event->timestamp = 0; /* #### */
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165 emacs_event->event.process.process = process;
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166 return;
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167 }
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168 }
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169
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170 /* We might get here when a fake event came through a signal. */
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171 /* Return a dummy event, so that a cycle of the command loop will
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172 occur. */
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173 drain_signal_event_pipe ();
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174 emacs_event->event_type = eval_event;
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175 /* eval events have nil as channel */
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176 emacs_event->event.eval.function = Qidentity;
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177 emacs_event->event.eval.object = Qnil;
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178 return;
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179 }
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180 else if (ndesc == 0) /* timeout fired */
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181 {
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182 tty_timeout_to_emacs_event (emacs_event);
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183 return;
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184 }
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185 }
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186 }
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187
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188 static void
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189 emacs_tty_handle_magic_event (struct Lisp_Event *emacs_event)
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190 {
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191 /* Nothing to do currently */
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192 }
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193
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194
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195 static void
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196 emacs_tty_select_process (struct Lisp_Process *process)
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197 {
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198 event_stream_unixoid_select_process (process);
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199 }
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200
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201 static void
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202 emacs_tty_unselect_process (struct Lisp_Process *process)
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203 {
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204 event_stream_unixoid_unselect_process (process);
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205 }
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206
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207 static void
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208 emacs_tty_select_console (struct console *con)
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209 {
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210 event_stream_unixoid_select_console (con);
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211 }
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212
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213 static void
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214 emacs_tty_unselect_console (struct console *con)
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215 {
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216 event_stream_unixoid_unselect_console (con);
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217 }
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218
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219 static void
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220 emacs_tty_quit_p (void)
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221 {
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222 /* Nothing to do currently because QUIT is handled through SIGINT.
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223 This could change. */
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224 }
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225
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263
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226 static USID
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227 emacs_tty_create_stream_pair (void* inhandle, void* outhandle,
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228 Lisp_Object* instream, Lisp_Object* outstream, int flags)
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229 {
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230 return event_stream_unixoid_create_stream_pair
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231 (inhandle, outhandle, instream, outstream, flags);
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232 }
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233
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234 static USID
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235 emacs_tty_delete_stream_pair (Lisp_Object instream, Lisp_Object outstream)
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236 {
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237 return event_stream_unixoid_delete_stream_pair (instream, outstream);
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238 }
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239
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0
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240
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241 /************************************************************************/
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242 /* initialization */
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243 /************************************************************************/
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244
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245 void
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246 vars_of_event_tty (void)
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247 {
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185
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248 tty_event_stream = xnew (struct event_stream);
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0
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249
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250 tty_event_stream->event_pending_p = emacs_tty_event_pending_p;
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251 tty_event_stream->next_event_cb = emacs_tty_next_event;
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252 tty_event_stream->handle_magic_event_cb = emacs_tty_handle_magic_event;
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253 tty_event_stream->add_timeout_cb = emacs_tty_add_timeout;
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254 tty_event_stream->remove_timeout_cb = emacs_tty_remove_timeout;
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255 tty_event_stream->select_console_cb = emacs_tty_select_console;
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256 tty_event_stream->unselect_console_cb = emacs_tty_unselect_console;
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257 tty_event_stream->select_process_cb = emacs_tty_select_process;
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258 tty_event_stream->unselect_process_cb = emacs_tty_unselect_process;
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259 tty_event_stream->quit_p_cb = emacs_tty_quit_p;
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263
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260 tty_event_stream->create_stream_pair_cb = emacs_tty_create_stream_pair;
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261 tty_event_stream->delete_stream_pair_cb = emacs_tty_delete_stream_pair;
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0
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262 }
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263
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264 void
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265 init_event_tty_late (void)
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266 {
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267 event_stream = tty_event_stream;
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268 }
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