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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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1268
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6 Copyright (C) 1995, 1996, 2001, 2002, 2003 Ben Wing.
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428
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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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872
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32 #include "console-stream-impl.h"
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33 #include "console-tty-impl.h"
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1204
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34 #include "device-impl.h"
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428
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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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1268
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47 In event-tty.c we call select() directly on this
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48 to retrieve an event. In event-Xt.c we use
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49 XtAppAddInput() and the call to select() is down in
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50 the guts of Xt, but we still use the masks when checking for pending input, even in event-Xt.c. (We can't use XtAppPending() because of the presence of the signal event pipe.)
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51
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428
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52 input_wait_mask == mask of all file descriptors we select() on,
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53 including TTY/stream console descriptors,
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54 process descriptors, and the signal event pipe.
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55
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56 non_fake_input_wait_mask == same as input_wait_mask but minus the
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57 signal event pipe. Also only used in
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58 event-tty.c.
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59
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60 process_only_mask == only the process descriptors.
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61
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62 tty_only_mask == only the TTY/stream console descriptors.
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63 */
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64 SELECT_TYPE input_wait_mask, non_fake_input_wait_mask;
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65 SELECT_TYPE process_only_mask, tty_only_mask;
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66
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67 /* This is used to terminate the select(), when an event came in
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68 through a signal (e.g. window-change or C-g on controlling TTY). */
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69 int signal_event_pipe[2];
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70
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71 int signal_event_pipe_initialized;
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72
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73 int fake_event_occurred;
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74
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1204
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75 struct console *
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76 find_tty_or_stream_console_from_fd (int fd)
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77 {
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78 Lisp_Object concons;
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79
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80 CONSOLE_LOOP (concons)
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81 {
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82 struct console *c;
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83
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84 c = XCONSOLE (XCAR (concons));
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85 if ((CONSOLE_TTY_P (c) && CONSOLE_TTY_DATA (c)->infd == fd) ||
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86 (CONSOLE_STREAM_P (c) && fileno (CONSOLE_STREAM_DATA (c)->in) == fd))
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87 return c;
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88 }
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89
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90 return 0;
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91 }
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92
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428
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93 int
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771
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94 read_event_from_tty_or_stream_desc (Lisp_Event *event, struct console *con)
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428
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95 {
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867
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96 Ichar ch;
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793
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97 Lisp_Object console = wrap_console (con);
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428
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98
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771
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99 if (CONSOLE_TTY_P (con))
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867
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100 ch = Lstream_get_ichar (XLSTREAM (CONSOLE_TTY_DATA (con)->instream));
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771
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101 else
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102 {
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103 /* #### Definitely something strange here. We should be setting
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104 the stdio handle unbuffered and reading from it instead of mixing
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105 stdio and raw io calls. */
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106 int nread = retry_read (fileno (CONSOLE_STREAM_DATA (con)->in), &ch, 1);
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107 if (nread <= 0)
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108 ch = -1;
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109 }
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110
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111 if (ch < 0)
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428
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112 {
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113 /* deleting the console might not be safe right now ... */
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114 enqueue_magic_eval_event (io_error_delete_console, console);
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115 /* but we definitely need to unselect it to avoid infinite
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116 loops reading EOF's */
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117 Fconsole_disable_input (console);
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118 }
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119 else
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120 {
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1204
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121 /* Here we really do want to set the use_console_meta_flag because
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122 the char is from the TTY. */
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428
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123 character_to_event (ch, event, con, 1, 1);
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124 event->channel = console;
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125 return 1;
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126 }
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127 return 0;
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128 }
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129
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130 void
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131 signal_fake_event (void)
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132 {
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133 char byte = 0;
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134 /* We do the write always. Formerly I tried to "optimize" this
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135 by setting a flag indicating whether we're blocking and only
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136 doing the write in that case, but there is a race condition
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137 if the signal occurs after we've checked for the signal
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138 occurrence (which could occur in many places throughout
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139 an iteration of the command loop, e.g. in status_notify()),
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140 but before we set the blocking flag.
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141
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771
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142 This should be OK as long as write() is reentrant, which I'm fairly
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143 sure it is since it's a system call. */
|
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428
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144
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145 if (signal_event_pipe_initialized)
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146 /* In case a signal comes through while we're dumping */
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147 {
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148 int old_errno = errno;
|
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771
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149 retry_write (signal_event_pipe[1], &byte, 1);
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428
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150 errno = old_errno;
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151 }
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152 }
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153
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154 void
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155 drain_signal_event_pipe (void)
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156 {
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157 char chars[128];
|
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158 /* The input end of the pipe has been set to non-blocking. */
|
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771
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159 while (retry_read (signal_event_pipe[0], chars, sizeof (chars)) > 0)
|
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428
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160 ;
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161 }
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162
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1204
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163 void
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164 drain_tty_devices (void)
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165 {
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166 Lisp_Object devcons, concons;
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167 CONSOLE_LOOP (concons)
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168 {
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169 struct console *con = XCONSOLE (XCAR (concons));
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170 if (!con->input_enabled)
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171 continue;
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172
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173 CONSOLE_DEVICE_LOOP (devcons, con)
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174 {
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175 struct device *d = XDEVICE (XCAR (devcons));
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176 if (DEVICE_TTY_P (d))
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177 {
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178 SELECT_TYPE temp_mask;
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179 int infd = DEVICE_INFD (d);
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180
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181 FD_ZERO (&temp_mask);
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182 FD_SET (infd, &temp_mask);
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183
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184 while (1)
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185 {
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186 Lisp_Object event;
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187
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188 if (!poll_fds_for_input (temp_mask))
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189 break;
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190
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191 event = Fmake_event (Qnil, Qnil);
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192 if (!read_event_from_tty_or_stream_desc (XEVENT (event),
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193 con))
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194 /* EOF, or something ... */
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195 break;
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196
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197 /* queue the read event to be read for real later. */
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198 enqueue_dispatch_event (event);
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199 }
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200 }
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201 }
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202 }
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203 }
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204
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428
|
205 int
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206 event_stream_unixoid_select_console (struct console *con)
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207 {
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208 int infd;
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209
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210 if (CONSOLE_STREAM_P (con))
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211 infd = fileno (CONSOLE_STREAM_DATA (con)->in);
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212 else
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213 {
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214 assert (CONSOLE_TTY_P (con));
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215 infd = CONSOLE_TTY_DATA (con)->infd;
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216 }
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217
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218 assert (infd >= 0);
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219
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220 FD_SET (infd, &input_wait_mask);
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221 FD_SET (infd, &non_fake_input_wait_mask);
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222 FD_SET (infd, &tty_only_mask);
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223 return infd;
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224 }
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225
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|
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226 int
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227 event_stream_unixoid_unselect_console (struct console *con)
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|
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228 {
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|
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229 int infd;
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230
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231 if (CONSOLE_STREAM_P (con))
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232 infd = fileno (CONSOLE_STREAM_DATA (con)->in);
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233 else
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234 {
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235 assert (CONSOLE_TTY_P (con));
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236 infd = CONSOLE_TTY_DATA (con)->infd;
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237 }
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238
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|
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239 assert (infd >= 0);
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240
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241 FD_CLR (infd, &input_wait_mask);
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242 FD_CLR (infd, &non_fake_input_wait_mask);
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243 FD_CLR (infd, &tty_only_mask);
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244 return infd;
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245 }
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246
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|
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247 static int
|
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440
|
248 get_process_infd (Lisp_Process *p)
|
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428
|
249 {
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|
853
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250 Lisp_Object instr, outstr, errstr;
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251 get_process_streams (p, &instr, &outstr, &errstr);
|
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428
|
252 assert (!NILP (instr));
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253 return filedesc_stream_fd (XLSTREAM (instr));
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254 }
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255
|
|
853
|
256 static int
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|
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257 get_process_errfd (Lisp_Process *p)
|
|
428
|
258 {
|
|
853
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259 Lisp_Object instr, outstr, errstr;
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260 get_process_streams (p, &instr, &outstr, &errstr);
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|
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261 if (!NILP (errstr))
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262 return filedesc_stream_fd (XLSTREAM (errstr));
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263 else
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|
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264 return -1;
|
|
428
|
265 }
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|
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266
|
|
853
|
267 void
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|
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268 event_stream_unixoid_select_process (Lisp_Process *proc, int doin, int doerr,
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|
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269 int *infd, int *errfd)
|
|
428
|
270 {
|
|
853
|
271 if (doin)
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|
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272 {
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273 *infd = get_process_infd (proc);
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274 FD_SET (*infd, &input_wait_mask);
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275 FD_SET (*infd, &non_fake_input_wait_mask);
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276 FD_SET (*infd, &process_only_mask);
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277 }
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278
|
|
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279 if (doerr)
|
|
|
280 {
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|
|
281 *errfd = get_process_errfd (proc);
|
|
428
|
282
|
|
853
|
283 if (*errfd >= 0)
|
|
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284 {
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285 FD_SET (*errfd, &input_wait_mask);
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286 FD_SET (*errfd, &non_fake_input_wait_mask);
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287 FD_SET (*errfd, &process_only_mask);
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|
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288 }
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|
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289 }
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|
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290 }
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|
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291
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|
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292 void
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293 event_stream_unixoid_unselect_process (Lisp_Process *proc, int doin, int doerr,
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|
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294 int *infd, int *errfd)
|
|
|
295 {
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296 if (doin)
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|
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297 {
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|
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298 *infd = get_process_infd (proc);
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299 FD_CLR (*infd, &input_wait_mask);
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300 FD_CLR (*infd, &non_fake_input_wait_mask);
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301 FD_CLR (*infd, &process_only_mask);
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|
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302 }
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|
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303
|
|
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304 if (doerr)
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|
|
305 {
|
|
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306 *errfd = get_process_errfd (proc);
|
|
|
307
|
|
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308 if (*errfd >= 0)
|
|
|
309 {
|
|
|
310 FD_CLR (*errfd, &input_wait_mask);
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|
311 FD_CLR (*errfd, &non_fake_input_wait_mask);
|
|
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312 FD_CLR (*errfd, &process_only_mask);
|
|
|
313 }
|
|
|
314 }
|
|
428
|
315 }
|
|
|
316
|
|
|
317 int
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|
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318 poll_fds_for_input (SELECT_TYPE mask)
|
|
|
319 {
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|
|
320 EMACS_TIME sometime;
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|
|
321 EMACS_SELECT_TIME select_time;
|
|
|
322 SELECT_TYPE temp_mask;
|
|
|
323 int retval;
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|
|
324
|
|
|
325 while (1)
|
|
|
326 {
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|
|
327 EMACS_SET_SECS_USECS (sometime, 0, 0);
|
|
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328 EMACS_TIME_TO_SELECT_TIME (sometime, select_time);
|
|
|
329 temp_mask = mask;
|
|
|
330 /* To effect a poll, tell select() to block for zero seconds. */
|
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331 retval = select (MAXDESC, &temp_mask, 0, 0, &select_time);
|
|
|
332 if (retval >= 0)
|
|
|
333 return retval;
|
|
|
334 if (errno != EINTR)
|
|
|
335 {
|
|
|
336 /* Something went seriously wrong; don't abort since maybe
|
|
|
337 the TTY just died at the wrong time. */
|
|
442
|
338 stderr_out ("xemacs: select failed: errno = %d\n", errno);
|
|
428
|
339 return 0;
|
|
|
340 }
|
|
|
341 /* else, we got interrupted by a signal, so try again. */
|
|
|
342 }
|
|
|
343
|
|
1204
|
344 RETURN_NOT_REACHED (0);
|
|
428
|
345 }
|
|
|
346
|
|
|
347 /****************************************************************************/
|
|
|
348 /* Unixoid (file descriptors based) process I/O streams routines */
|
|
|
349 /****************************************************************************/
|
|
|
350
|
|
853
|
351 void
|
|
|
352 event_stream_unixoid_create_io_streams (void* inhandle, void* outhandle,
|
|
|
353 void *errhandle, Lisp_Object* instream,
|
|
|
354 Lisp_Object* outstream,
|
|
|
355 Lisp_Object* errstream,
|
|
|
356 USID* in_usid,
|
|
|
357 USID* err_usid,
|
|
|
358 int flags)
|
|
428
|
359 {
|
|
853
|
360 int infd, outfd, errfd;
|
|
428
|
361 /* Decode inhandle and outhandle. Their meaning depends on
|
|
|
362 the process implementation being used. */
|
|
4031
|
363 /* We are passed plain old file descs, which are ints, so */
|
|
|
364 /* if sizeof(EMACS_INT) > sizeof(int) it's OK. */
|
|
|
365 infd = (EMACS_INT) inhandle;
|
|
|
366 outfd = (EMACS_INT) outhandle;
|
|
|
367 errfd = (EMACS_INT) errhandle;
|
|
428
|
368
|
|
|
369 *instream = (infd >= 0
|
|
|
370 ? make_filedesc_input_stream (infd, 0, -1, 0)
|
|
|
371 : Qnil);
|
|
|
372
|
|
|
373 *outstream = (outfd >= 0
|
|
|
374 ? make_filedesc_output_stream (outfd, 0, -1, LSTR_BLOCKED_OK)
|
|
|
375 : Qnil);
|
|
|
376
|
|
853
|
377 *errstream = (errfd >= 0
|
|
|
378 ? make_filedesc_input_stream (errfd, 0, -1, 0)
|
|
|
379 : Qnil);
|
|
|
380
|
|
428
|
381 /* FLAGS is process->pty_flag for UNIX_PROCESSES */
|
|
|
382 if ((flags & STREAM_PTY_FLUSHING) && outfd >= 0)
|
|
|
383 {
|
|
867
|
384 Ibyte eof_char = get_eof_char (outfd);
|
|
428
|
385 int pty_max_bytes = get_pty_max_bytes (outfd);
|
|
853
|
386 filedesc_stream_set_pty_flushing (XLSTREAM (*outstream), pty_max_bytes,
|
|
|
387 eof_char);
|
|
428
|
388 }
|
|
|
389
|
|
853
|
390 *in_usid = FD_TO_USID (infd);
|
|
|
391 *err_usid = FD_TO_USID (errfd);
|
|
428
|
392 }
|
|
|
393
|
|
853
|
394 void
|
|
|
395 event_stream_unixoid_delete_io_streams (Lisp_Object instream,
|
|
|
396 Lisp_Object outstream,
|
|
|
397 Lisp_Object errstream,
|
|
|
398 USID *in_usid,
|
|
|
399 USID *err_usid)
|
|
428
|
400 {
|
|
853
|
401 int in = (NILP (instream) ? -1
|
|
428
|
402 : filedesc_stream_fd (XLSTREAM (instream)));
|
|
853
|
403 int out = (NILP (outstream) ? -1
|
|
428
|
404 : filedesc_stream_fd (XLSTREAM (outstream)));
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853
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405 int err = (NILP (errstream) ? -1
|
|
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406 : filedesc_stream_fd (XLSTREAM (errstream)));
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428
|
407
|
|
|
408 if (in >= 0)
|
|
771
|
409 retry_close (in);
|
|
428
|
410 if (out != in && out >= 0)
|
|
771
|
411 retry_close (out);
|
|
853
|
412 if (err != in && err != out && err >= 0)
|
|
|
413 retry_close (err);
|
|
428
|
414
|
|
853
|
415 *in_usid = FD_TO_USID (in);
|
|
|
416 *err_usid = FD_TO_USID (err);
|
|
428
|
417 }
|
|
|
418
|
|
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419
|
|
|
420 void
|
|
|
421 init_event_unixoid (void)
|
|
|
422 {
|
|
|
423 /* Do this first; the init_event_*_late() functions
|
|
|
424 pay attention to it. */
|
|
|
425 if (pipe (signal_event_pipe) < 0)
|
|
|
426 {
|
|
|
427 perror ("XEmacs: can't open pipe");
|
|
|
428 exit (-1);
|
|
|
429 }
|
|
|
430 signal_event_pipe_initialized = 1;
|
|
|
431
|
|
|
432 /* Set it non-blocking so we can drain its output. */
|
|
|
433 set_descriptor_non_blocking (signal_event_pipe[0]);
|
|
|
434
|
|
|
435 /* Also set the write descriptor non-blocking so we don't
|
|
|
436 hang in case a long time passes between times when
|
|
|
437 we drain the pipe. */
|
|
|
438 set_descriptor_non_blocking (signal_event_pipe[1]);
|
|
|
439
|
|
|
440 /* WARNING: In order for the signal-event pipe to work correctly
|
|
|
441 and not cause lockups, the following need to be followed:
|
|
|
442
|
|
|
443 1) event_pending_p() must ignore input on the signal-event pipe.
|
|
|
444 2) As soon as next_event() notices input on the signal-event
|
|
|
445 pipe, it must drain it. */
|
|
|
446 FD_ZERO (&input_wait_mask);
|
|
|
447 FD_ZERO (&non_fake_input_wait_mask);
|
|
|
448 FD_ZERO (&process_only_mask);
|
|
|
449 FD_ZERO (&tty_only_mask);
|
|
|
450
|
|
|
451 FD_SET (signal_event_pipe[0], &input_wait_mask);
|
|
|
452 }
|
