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428
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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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36 #include "lstream.h"
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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 "sysfile.h"
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41 #include "sysproc.h" /* select stuff */
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42 #include "systime.h"
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43
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44 /* Mask of bits indicating the descriptors that we wait for input on.
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45 These work as follows:
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46
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47 input_wait_mask == mask of all file descriptors we select() on,
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48 including TTY/stream console descriptors,
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49 process descriptors, and the signal event pipe.
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50 Only used in event-tty.c; event-Xt.c uses
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51 XtAppAddInput(), and the call to select() is down in
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52 the guts of Xt.
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53
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54 non_fake_input_wait_mask == same as input_wait_mask but minus the
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55 signal event pipe. Also only used in
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56 event-tty.c.
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57
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58 process_only_mask == only the process descriptors.
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59
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60 tty_only_mask == only the TTY/stream console descriptors.
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61 */
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62 SELECT_TYPE input_wait_mask, non_fake_input_wait_mask;
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63 SELECT_TYPE process_only_mask, tty_only_mask;
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64
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65 /* This is used to terminate the select(), when an event came in
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66 through a signal (e.g. window-change or C-g on controlling TTY). */
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67 int signal_event_pipe[2];
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68
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69 int signal_event_pipe_initialized;
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70
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71 int fake_event_occurred;
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72
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73 int
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74 read_event_from_tty_or_stream_desc (struct Lisp_Event *event,
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75 struct console *con, int fd)
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76 {
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77 unsigned char ch;
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78 int nread;
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79 Lisp_Object console;
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80
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81 XSETCONSOLE (console, con);
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82
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83 nread = read (fd, &ch, 1);
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84 if (nread <= 0)
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85 {
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86 /* deleting the console might not be safe right now ... */
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87 enqueue_magic_eval_event (io_error_delete_console, console);
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88 /* but we definitely need to unselect it to avoid infinite
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89 loops reading EOF's */
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90 Fconsole_disable_input (console);
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91 }
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92 else
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93 {
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94 character_to_event (ch, event, con, 1, 1);
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95 event->channel = console;
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96 return 1;
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97 }
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98 return 0;
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99 }
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100
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101 void
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102 signal_fake_event (void)
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103 {
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104 char byte = 0;
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105 /* We do the write always. Formerly I tried to "optimize" this
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106 by setting a flag indicating whether we're blocking and only
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107 doing the write in that case, but there is a race condition
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108 if the signal occurs after we've checked for the signal
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109 occurrence (which could occur in many places throughout
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110 an iteration of the command loop, e.g. in status_notify()),
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111 but before we set the blocking flag.
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112
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113 This should be OK as long as write() is reentrant, which
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114 I'm fairly sure it is since it's a system call. */
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115
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116 if (signal_event_pipe_initialized)
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117 /* In case a signal comes through while we're dumping */
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118 {
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119 int old_errno = errno;
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120 write (signal_event_pipe[1], &byte, 1);
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121 errno = old_errno;
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122 }
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123 }
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124
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125 void
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126 drain_signal_event_pipe (void)
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127 {
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128 char chars[128];
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129 /* The input end of the pipe has been set to non-blocking. */
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130 while (read (signal_event_pipe[0], chars, sizeof (chars)) > 0)
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131 ;
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132 }
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133
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134 int
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135 event_stream_unixoid_select_console (struct console *con)
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136 {
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137 int infd;
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138
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139 if (CONSOLE_STREAM_P (con))
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140 infd = fileno (CONSOLE_STREAM_DATA (con)->in);
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141 else
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142 {
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143 assert (CONSOLE_TTY_P (con));
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144 infd = CONSOLE_TTY_DATA (con)->infd;
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145 }
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146
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147 assert (infd >= 0);
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148
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149 FD_SET (infd, &input_wait_mask);
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150 FD_SET (infd, &non_fake_input_wait_mask);
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151 FD_SET (infd, &tty_only_mask);
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152 return infd;
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153 }
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154
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155 int
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156 event_stream_unixoid_unselect_console (struct console *con)
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157 {
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158 int infd;
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159
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160 if (CONSOLE_STREAM_P (con))
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161 infd = fileno (CONSOLE_STREAM_DATA (con)->in);
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162 else
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163 {
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164 assert (CONSOLE_TTY_P (con));
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165 infd = CONSOLE_TTY_DATA (con)->infd;
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166 }
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167
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168 assert (infd >= 0);
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169
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170 FD_CLR (infd, &input_wait_mask);
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171 FD_CLR (infd, &non_fake_input_wait_mask);
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172 FD_CLR (infd, &tty_only_mask);
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173 return infd;
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174 }
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175
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176 static int
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177 get_process_infd (struct Lisp_Process *p)
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178 {
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179 Lisp_Object instr, outstr;
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180 get_process_streams (p, &instr, &outstr);
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181 assert (!NILP (instr));
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182 return filedesc_stream_fd (XLSTREAM (instr));
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183 }
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184
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185 int
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186 event_stream_unixoid_select_process (struct Lisp_Process *proc)
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187 {
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188 int infd = get_process_infd (proc);
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189
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190 FD_SET (infd, &input_wait_mask);
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191 FD_SET (infd, &non_fake_input_wait_mask);
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192 FD_SET (infd, &process_only_mask);
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193 return infd;
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194 }
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195
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196 int
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197 event_stream_unixoid_unselect_process (struct Lisp_Process *proc)
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198 {
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199 int infd = get_process_infd (proc);
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200
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201 FD_CLR (infd, &input_wait_mask);
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202 FD_CLR (infd, &non_fake_input_wait_mask);
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203 FD_CLR (infd, &process_only_mask);
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204 return infd;
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205 }
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206
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207 int
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208 poll_fds_for_input (SELECT_TYPE mask)
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209 {
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210 EMACS_TIME sometime;
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211 EMACS_SELECT_TIME select_time;
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212 SELECT_TYPE temp_mask;
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213 int retval;
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214
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215 while (1)
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216 {
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217 EMACS_SET_SECS_USECS (sometime, 0, 0);
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218 EMACS_TIME_TO_SELECT_TIME (sometime, select_time);
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219 temp_mask = mask;
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220 /* To effect a poll, tell select() to block for zero seconds. */
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221 retval = select (MAXDESC, &temp_mask, 0, 0, &select_time);
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222 if (retval >= 0)
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223 return retval;
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224 if (errno != EINTR)
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225 {
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226 /* Something went seriously wrong; don't abort since maybe
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227 the TTY just died at the wrong time. */
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228 fprintf (stderr, "xemacs: select failed: errno = %d\n", errno);
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229 return 0;
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230 }
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231 /* else, we got interrupted by a signal, so try again. */
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232 }
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233
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234 RETURN_NOT_REACHED(0) /* not reached */
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235 }
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236
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237 /****************************************************************************/
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238 /* Unixoid (file descriptors based) process I/O streams routines */
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239 /****************************************************************************/
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240
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241 USID
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242 event_stream_unixoid_create_stream_pair (void* inhandle, void* outhandle,
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243 Lisp_Object* instream,
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244 Lisp_Object* outstream,
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245 int flags)
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246 {
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247 int infd, outfd;
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248 /* Decode inhandle and outhandle. Their meaning depends on
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249 the process implementation being used. */
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250 #if defined (HAVE_WIN32_PROCESSES)
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251 /* We're passed in Windows handles. Open new fds for them */
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252 if ((HANDLE)inhandle != INVALID_HANDLE_VALUE)
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253 {
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254 infd = open_osfhandle ((HANDLE)inhandle, 0);
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255 if (infd < 0)
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256 return USID_ERROR;
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257 }
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258 else
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259 infd = -1;
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260
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261 if ((HANDLE)outhandle != INVALID_HANDLE_VALUE)
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262 {
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263 outfd = open_osfhandle ((HANDLE)outhandle, 0);
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264 if (outfd < 0)
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265 {
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266 if (infd >= 0)
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267 close (infd);
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268 return USID_ERROR;
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269 }
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270 }
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271 else
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272 outfd = -1;
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273
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274 flags = 0;
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275 #elif defined (HAVE_UNIX_PROCESSES)
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276 /* We are passed plain old file descs */
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277 infd = (int)inhandle;
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278 outfd = (int)outhandle;
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279 #else
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280 # error Which processes do you have?
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281 #endif
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282
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283 *instream = (infd >= 0
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284 ? make_filedesc_input_stream (infd, 0, -1, 0)
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285 : Qnil);
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286
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287 *outstream = (outfd >= 0
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288 ? make_filedesc_output_stream (outfd, 0, -1, LSTR_BLOCKED_OK)
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289 : Qnil);
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290
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291 #if defined(HAVE_UNIX_PROCESSES) && defined(HAVE_PTYS)
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292 /* FLAGS is process->pty_flag for UNIX_PROCESSES */
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293 if ((flags & STREAM_PTY_FLUSHING) && outfd >= 0)
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294 {
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295 Bufbyte eof_char = get_eof_char (outfd);
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296 int pty_max_bytes = get_pty_max_bytes (outfd);
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297 filedesc_stream_set_pty_flushing (XLSTREAM(*outstream), pty_max_bytes, eof_char);
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298 }
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299 #endif
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300
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301 return FD_TO_USID (infd);
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302 }
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303
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304 USID
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305 event_stream_unixoid_delete_stream_pair (Lisp_Object instream,
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306 Lisp_Object outstream)
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307 {
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308 int in = (NILP(instream) ? -1
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309 : filedesc_stream_fd (XLSTREAM (instream)));
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310 int out = (NILP(outstream) ? -1
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311 : filedesc_stream_fd (XLSTREAM (outstream)));
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312
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313 if (in >= 0)
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314 close (in);
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315 if (out != in && out >= 0)
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316 close (out);
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317
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318 return FD_TO_USID (in);
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319 }
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320
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321
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322 void
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323 init_event_unixoid (void)
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324 {
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325 /* Do this first; the init_event_*_late() functions
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326 pay attention to it. */
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327 if (pipe (signal_event_pipe) < 0)
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328 {
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329 perror ("XEmacs: can't open pipe");
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330 exit (-1);
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331 }
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332 signal_event_pipe_initialized = 1;
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333
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334 /* Set it non-blocking so we can drain its output. */
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335 set_descriptor_non_blocking (signal_event_pipe[0]);
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336
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337 /* Also set the write descriptor non-blocking so we don't
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338 hang in case a long time passes between times when
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339 we drain the pipe. */
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340 set_descriptor_non_blocking (signal_event_pipe[1]);
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341
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342 /* WARNING: In order for the signal-event pipe to work correctly
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343 and not cause lockups, the following need to be followed:
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344
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345 1) event_pending_p() must ignore input on the signal-event pipe.
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346 2) As soon as next_event() notices input on the signal-event
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347 pipe, it must drain it. */
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348 FD_ZERO (&input_wait_mask);
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349 FD_ZERO (&non_fake_input_wait_mask);
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350 FD_ZERO (&process_only_mask);
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351 FD_ZERO (&tty_only_mask);
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352
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353 FD_SET (signal_event_pipe[0], &input_wait_mask);
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354 }
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