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0
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1 /* Code shared between all event loops that use select() and have a
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2 different input descriptor for each device.
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3 Copyright (C) 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
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4 Copyright (C) 1995 Board of Trustees, University of Illinois.
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5 Copyright (C) 1995 Sun Microsystems, Inc.
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6 Copyright (C) 1995, 1996 Ben Wing.
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7
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8 This file is part of XEmacs.
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9
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10 XEmacs is free software; you can redistribute it and/or modify it
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11 under the terms of the GNU General Public License as published by the
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12 Free Software Foundation; either version 2, or (at your option) any
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13 later version.
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14
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15 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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16 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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17 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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18 for more details.
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19
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20 You should have received a copy of the GNU General Public License
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21 along with XEmacs; see the file COPYING. If not, write to
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22 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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23 Boston, MA 02111-1307, USA. */
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24
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25 /* Synched up with: Not in FSF. */
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26
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27 /* This file has been Mule-ized. */
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28
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29 #include <config.h>
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30 #include "lisp.h"
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31
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32 #include "console-stream.h"
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33 #include "console-tty.h"
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34 #include "device.h"
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35 #include "events.h"
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263
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36 #include "lstream.h"
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0
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37 #include "process.h"
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38
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39 #include "sysdep.h"
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40 #include "sysproc.h" /* select stuff */
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41 #include "systime.h"
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42
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153
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43 #ifdef HAVE_GPM
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44 #include "gpmevent.h"
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45 #include <gpm.h>
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46 #endif
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47
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0
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48 /* Mask of bits indicating the descriptors that we wait for input on.
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49 These work as follows:
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50
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51 input_wait_mask == mask of all file descriptors we select() on,
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52 including TTY/stream console descriptors,
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53 process descriptors, and the signal event pipe.
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54 Only used in event-tty.c; event-Xt.c uses
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55 XtAppAddInput(), and the call to select() is down in
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56 the guts of Xt.
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57
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58 non_fake_input_wait_mask == same as input_wait_mask but minus the
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59 signal event pipe. Also only used in
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60 event-tty.c.
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61
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62 process_only_mask == only the process descriptors.
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63
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64 tty_only_mask == only the TTY/stream console descriptors.
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65 */
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66 SELECT_TYPE input_wait_mask, non_fake_input_wait_mask;
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67 SELECT_TYPE process_only_mask, tty_only_mask;
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68
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69 /* This is used to terminate the select(), when an event came in
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70 through a signal (e.g. window-change or C-g on controlling TTY). */
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71 int signal_event_pipe[2];
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72
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73 static int signal_event_pipe_initialized;
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74
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75 int fake_event_occurred;
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76
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77 int
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78 read_event_from_tty_or_stream_desc (struct Lisp_Event *event,
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79 struct console *con, int fd)
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80 {
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81 unsigned char ch;
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82 int nread;
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83 Lisp_Object console = Qnil;
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84
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85 XSETCONSOLE (console, con);
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86
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153
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87 #ifdef HAVE_GPM
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88 if (fd == CONSOLE_TTY_MOUSE_FD (con)) {
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89 return (handle_gpm_read (event,con,fd));
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90 }
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91 #endif
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92
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0
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93 nread = read (fd, &ch, 1);
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94 if (nread <= 0)
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95 {
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96 /* deleting the console might not be safe right now ... */
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97 enqueue_magic_eval_event (io_error_delete_console, console);
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98 /* but we definitely need to unselect it to avoid infinite
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99 loops reading EOF's */
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100 Fconsole_disable_input (console);
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101 }
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102 else
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103 {
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263
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104 character_to_event (ch, event, con, 1, 1);
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105 event->channel = console;
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106 return 1;
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107 }
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108 return 0;
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109 }
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110
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111 void
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112 signal_fake_event (void)
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113 {
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114 char byte = 0;
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115 /* We do the write always. Formerly I tried to "optimize" this
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116 by setting a flag indicating whether we're blocking and only
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117 doing the write in that case, but there is a race condition
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118 if the signal occurs after we've checked for the signal
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119 occurrence (which could occur in many places throughout
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120 an iteration of the command loop, e.g. in status_notify()),
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121 but before we set the blocking flag.
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122
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123 This should be OK as long as write() is reentrant, which
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124 I'm fairly sure it is since it's a system call. */
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125
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126 if (signal_event_pipe_initialized)
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127 /* In case a signal comes through while we're dumping */
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128 {
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129 int old_errno = errno;
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130 write (signal_event_pipe[1], &byte, 1);
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131 errno = old_errno;
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132 }
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133 }
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134
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135 void
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136 drain_signal_event_pipe (void)
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137 {
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138 char chars[128];
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139 /* The input end of the pipe has been set to non-blocking. */
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140 while (read (signal_event_pipe[0], chars, sizeof (chars)) > 0)
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141 ;
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142 }
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143
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144 int
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145 event_stream_unixoid_select_console (struct console *con)
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146 {
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147 int infd;
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148
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149 if (CONSOLE_STREAM_P (con))
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150 infd = fileno (CONSOLE_STREAM_DATA (con)->infd);
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151 else
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152 {
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153 assert (CONSOLE_TTY_P (con));
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154 infd = CONSOLE_TTY_DATA (con)->infd;
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155 }
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156
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157 assert (infd >= 0);
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158
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159 FD_SET (infd, &input_wait_mask);
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160 FD_SET (infd, &non_fake_input_wait_mask);
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161 FD_SET (infd, &tty_only_mask);
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162 return infd;
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163 }
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164
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165 int
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166 event_stream_unixoid_unselect_console (struct console *con)
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167 {
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168 int infd;
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169
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170 if (CONSOLE_STREAM_P (con))
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171 infd = fileno (CONSOLE_STREAM_DATA (con)->infd);
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172 else
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173 {
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174 assert (CONSOLE_TTY_P (con));
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175 infd = CONSOLE_TTY_DATA (con)->infd;
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176 }
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177
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178 assert (infd >= 0);
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179
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180 FD_CLR (infd, &input_wait_mask);
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181 FD_CLR (infd, &non_fake_input_wait_mask);
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182 FD_CLR (infd, &tty_only_mask);
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183 return infd;
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184 }
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185
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263
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186 static int
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187 get_process_infd (struct Lisp_Process *p)
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188 {
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189 Lisp_Object instr, outstr;
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190 get_process_streams (p, &instr, &outstr);
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191 assert (!NILP (instr));
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192 return filedesc_stream_fd (XLSTREAM (instr));
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193 }
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194
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195 int
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196 event_stream_unixoid_select_process (struct Lisp_Process *proc)
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197 {
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263
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198 int infd = get_process_infd (proc);
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0
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199
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200 FD_SET (infd, &input_wait_mask);
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201 FD_SET (infd, &non_fake_input_wait_mask);
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202 FD_SET (infd, &process_only_mask);
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203 return infd;
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204 }
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205
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206 int
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207 event_stream_unixoid_unselect_process (struct Lisp_Process *proc)
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208 {
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263
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209 int infd = get_process_infd (proc);
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0
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210
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211 FD_CLR (infd, &input_wait_mask);
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212 FD_CLR (infd, &non_fake_input_wait_mask);
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213 FD_CLR (infd, &process_only_mask);
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214 return infd;
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215 }
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216
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217 int
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218 poll_fds_for_input (SELECT_TYPE mask)
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219 {
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220 EMACS_TIME sometime;
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221 EMACS_SELECT_TIME select_time;
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222 SELECT_TYPE temp_mask;
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223 int retval;
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224
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225 while (1)
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226 {
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227 EMACS_SET_SECS_USECS (sometime, 0, 0);
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228 EMACS_TIME_TO_SELECT_TIME (sometime, select_time);
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229 temp_mask = mask;
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230 /* To effect a poll, tell select() to block for zero seconds. */
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231 retval = select (MAXDESC, &temp_mask, 0, 0, &select_time);
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232 if (retval >= 0)
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233 return retval;
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234 if (errno != EINTR)
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235 {
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236 /* Something went seriously wrong; don't abort since maybe
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237 the TTY just died at the wrong time. */
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238 fprintf (stderr, "xemacs: select failed: errno = %d\n", errno);
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239 return 0;
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240 }
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241 /* else, we got interrupted by a signal, so try again. */
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242 }
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243
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244 RETURN_NOT_REACHED(0) /* not reached */
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245 }
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263
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246
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247 /****************************************************************************/
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248 /* Unixoid (file descriptors based) process I/O streams routines */
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249 /****************************************************************************/
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250
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251 USID
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252 event_stream_unixoid_create_stream_pair (void* inhandle, void* outhandle,
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253 Lisp_Object* instream,
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254 Lisp_Object* outstream,
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255 int flags)
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256 {
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257 int infd, outfd;
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258 /* Decode inhandle and outhandle. Their meaning depends on
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259 the process implementation being used. */
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260 #ifdef HAVE_WIN32_PROCESSES
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261 /* We're passed in Windows handles. Open new fds for them */
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262 if ((HANDLE)inhandle != INVALID_HANDLE_VALUE)
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263 {
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264 infd = open_osfhandle ((HANDLE)inhandle, 0);
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265 if (infd < 0)
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266 return USID_ERROR;
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267 }
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268 else
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269 infd = -1;
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270
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271 if ((HANDLE)outhandle != INVALID_HANDLE_VALUE)
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272 {
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273 outfd = open_osfhandle ((HANDLE)outhandle, 0);
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274 if (outfd < 0)
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275 {
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276 if (infd >= 0)
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277 close (infd);
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278 return USID_ERROR;
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279 }
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280 }
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281 else
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282 outfd = -1;
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283
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284 flags = 0;
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285 #endif
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286
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287 #ifdef HAVE_UNIX_PROCESSES
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288 /* We are passed plain old file descs */
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289 infd = (int)inhandle;
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290 outfd = (int)outhandle;
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291 #endif
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292
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293 *instream = (infd >= 0
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294 ? make_filedesc_input_stream (infd, 0, -1, 0)
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295 : Qnil);
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296
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297 *outstream = (outfd >= 0
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298 ? make_filedesc_output_stream (outfd, 0, -1, LSTR_BLOCKED_OK)
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299 : Qnil);
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300
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301 #if defined(HAVE_UNIX_PROCESSES) && defined(HAVE_PTYS)
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302 /* FLAGS is process->pty_flag for UNIX_PROCESSES */
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303 if (flags && outfd >= 0)
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304 {
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305 Bufbyte eof_char = get_eof_char (outfd);
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306 int pty_max_bytes = get_pty_max_bytes (outfd);
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307 filedesc_stream_set_pty_flushing (XLSTREAM(*outstream), pty_max_bytes, eof_char);
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308 }
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309 #endif
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310
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311 return FD_TO_USID (infd);
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312 }
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313
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314 USID
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315 event_stream_unixoid_delete_stream_pair (Lisp_Object instream,
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316 Lisp_Object outstream)
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317 {
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318 int in = (NILP(instream) ? -1
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319 : filedesc_stream_fd (XLSTREAM (instream)));
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320 int out = (NILP(outstream) ? -1
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321 : filedesc_stream_fd (XLSTREAM (outstream)));
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322
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323 if (in >= 0)
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324 close (in);
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325 if (out != in && out >= 0)
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326 close (out);
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327
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328 if (!NILP (instream))
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329 Lstream_close (XLSTREAM (instream));
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330 if (!NILP (outstream))
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331 Lstream_close (XLSTREAM (outstream));
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332
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333 return FD_TO_USID (in);
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334 }
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0
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335
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336
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337 void
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338 init_event_unixoid (void)
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339 {
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340 /* Do this first; the init_event_*_late() functions
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341 pay attention to it. */
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342 if (pipe (signal_event_pipe) < 0)
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343 {
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344 perror ("XEmacs: can't open pipe");
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345 exit (-1);
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346 }
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347 signal_event_pipe_initialized = 1;
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185
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348
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0
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349 /* Set it non-blocking so we can drain its output. */
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350 set_descriptor_non_blocking (signal_event_pipe[0]);
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185
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351
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0
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352 /* Also set the write descriptor non-blocking so we don't
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353 hang in case a long time passes between times when
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354 we drain the pipe. */
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355 set_descriptor_non_blocking (signal_event_pipe[1]);
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185
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356
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0
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357 /* WARNING: In order for the signal-event pipe to work correctly
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358 and not cause lockups, the following need to be followed:
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185
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359
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0
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360 1) event_pending_p() must ignore input on the signal-event pipe.
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361 2) As soon as next_event() notices input on the signal-event
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362 pipe, it must drain it. */
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363 FD_ZERO (&input_wait_mask);
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364 FD_ZERO (&non_fake_input_wait_mask);
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365 FD_ZERO (&process_only_mask);
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366 FD_ZERO (&tty_only_mask);
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185
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367
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0
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368 FD_SET (signal_event_pipe[0], &input_wait_mask);
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369 }
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