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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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801
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6 Copyright (C) 1995, 1996, 2001, 2002 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
|
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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1204
|
73 struct console *
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74 find_tty_or_stream_console_from_fd (int fd)
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75 {
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76 Lisp_Object concons;
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77
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78 CONSOLE_LOOP (concons)
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79 {
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80 struct console *c;
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81
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82 c = XCONSOLE (XCAR (concons));
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83 if ((CONSOLE_TTY_P (c) && CONSOLE_TTY_DATA (c)->infd == fd) ||
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84 (CONSOLE_STREAM_P (c) && fileno (CONSOLE_STREAM_DATA (c)->in) == fd))
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85 return c;
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86 }
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87
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88 return 0;
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89 }
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90
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428
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91 int
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771
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92 read_event_from_tty_or_stream_desc (Lisp_Event *event, struct console *con)
|
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428
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93 {
|
|
867
|
94 Ichar ch;
|
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793
|
95 Lisp_Object console = wrap_console (con);
|
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428
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96
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|
771
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97 if (CONSOLE_TTY_P (con))
|
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867
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98 ch = Lstream_get_ichar (XLSTREAM (CONSOLE_TTY_DATA (con)->instream));
|
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771
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99 else
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100 {
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101 /* #### Definitely something strange here. We should be setting
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102 the stdio handle unbuffered and reading from it instead of mixing
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103 stdio and raw io calls. */
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104 int nread = retry_read (fileno (CONSOLE_STREAM_DATA (con)->in), &ch, 1);
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105 if (nread <= 0)
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106 ch = -1;
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107 }
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108
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109 if (ch < 0)
|
|
428
|
110 {
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111 /* deleting the console might not be safe right now ... */
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112 enqueue_magic_eval_event (io_error_delete_console, console);
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113 /* but we definitely need to unselect it to avoid infinite
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114 loops reading EOF's */
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115 Fconsole_disable_input (console);
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116 }
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117 else
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118 {
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1204
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119 /* Here we really do want to set the use_console_meta_flag because
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120 the char is from the TTY. */
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428
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121 character_to_event (ch, event, con, 1, 1);
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122 event->channel = console;
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123 return 1;
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124 }
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125 return 0;
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126 }
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127
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128 void
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129 signal_fake_event (void)
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130 {
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131 char byte = 0;
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132 /* We do the write always. Formerly I tried to "optimize" this
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133 by setting a flag indicating whether we're blocking and only
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134 doing the write in that case, but there is a race condition
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135 if the signal occurs after we've checked for the signal
|
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136 occurrence (which could occur in many places throughout
|
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137 an iteration of the command loop, e.g. in status_notify()),
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138 but before we set the blocking flag.
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139
|
|
771
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140 This should be OK as long as write() is reentrant, which I'm fairly
|
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141 sure it is since it's a system call. */
|
|
428
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142
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|
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143 if (signal_event_pipe_initialized)
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144 /* In case a signal comes through while we're dumping */
|
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|
145 {
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|
|
146 int old_errno = errno;
|
|
771
|
147 retry_write (signal_event_pipe[1], &byte, 1);
|
|
428
|
148 errno = old_errno;
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|
|
149 }
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|
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150 }
|
|
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151
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|
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152 void
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153 drain_signal_event_pipe (void)
|
|
|
154 {
|
|
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155 char chars[128];
|
|
|
156 /* The input end of the pipe has been set to non-blocking. */
|
|
771
|
157 while (retry_read (signal_event_pipe[0], chars, sizeof (chars)) > 0)
|
|
428
|
158 ;
|
|
|
159 }
|
|
|
160
|
|
1204
|
161 void
|
|
|
162 drain_tty_devices (void)
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|
163 {
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|
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164 Lisp_Object devcons, concons;
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165 CONSOLE_LOOP (concons)
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|
|
166 {
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|
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167 struct console *con = XCONSOLE (XCAR (concons));
|
|
|
168 if (!con->input_enabled)
|
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|
169 continue;
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170
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|
|
171 CONSOLE_DEVICE_LOOP (devcons, con)
|
|
|
172 {
|
|
|
173 struct device *d = XDEVICE (XCAR (devcons));
|
|
|
174 if (DEVICE_TTY_P (d))
|
|
|
175 {
|
|
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176 SELECT_TYPE temp_mask;
|
|
|
177 int infd = DEVICE_INFD (d);
|
|
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178
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|
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179 FD_ZERO (&temp_mask);
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180 FD_SET (infd, &temp_mask);
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181
|
|
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182 while (1)
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183 {
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184 Lisp_Object event;
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185
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|
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186 if (!poll_fds_for_input (temp_mask))
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|
|
187 break;
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|
|
188
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|
|
189 event = Fmake_event (Qnil, Qnil);
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|
|
190 if (!read_event_from_tty_or_stream_desc (XEVENT (event),
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191 con))
|
|
|
192 /* EOF, or something ... */
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|
193 break;
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194
|
|
|
195 /* queue the read event to be read for real later. */
|
|
|
196 enqueue_dispatch_event (event);
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|
|
197 }
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|
|
198 }
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|
|
199 }
|
|
|
200 }
|
|
|
201 }
|
|
|
202
|
|
428
|
203 int
|
|
|
204 event_stream_unixoid_select_console (struct console *con)
|
|
|
205 {
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|
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206 int infd;
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|
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207
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|
|
208 if (CONSOLE_STREAM_P (con))
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209 infd = fileno (CONSOLE_STREAM_DATA (con)->in);
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210 else
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|
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211 {
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|
|
212 assert (CONSOLE_TTY_P (con));
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|
|
213 infd = CONSOLE_TTY_DATA (con)->infd;
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|
|
214 }
|
|
|
215
|
|
|
216 assert (infd >= 0);
|
|
|
217
|
|
|
218 FD_SET (infd, &input_wait_mask);
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|
|
219 FD_SET (infd, &non_fake_input_wait_mask);
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|
|
220 FD_SET (infd, &tty_only_mask);
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|
|
221 return infd;
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|
|
222 }
|
|
|
223
|
|
|
224 int
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|
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225 event_stream_unixoid_unselect_console (struct console *con)
|
|
|
226 {
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|
|
227 int infd;
|
|
|
228
|
|
|
229 if (CONSOLE_STREAM_P (con))
|
|
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230 infd = fileno (CONSOLE_STREAM_DATA (con)->in);
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|
|
231 else
|
|
|
232 {
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|
|
233 assert (CONSOLE_TTY_P (con));
|
|
|
234 infd = CONSOLE_TTY_DATA (con)->infd;
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|
|
235 }
|
|
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236
|
|
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237 assert (infd >= 0);
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|
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238
|
|
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239 FD_CLR (infd, &input_wait_mask);
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|
|
240 FD_CLR (infd, &non_fake_input_wait_mask);
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|
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241 FD_CLR (infd, &tty_only_mask);
|
|
|
242 return infd;
|
|
|
243 }
|
|
|
244
|
|
|
245 static int
|
|
440
|
246 get_process_infd (Lisp_Process *p)
|
|
428
|
247 {
|
|
853
|
248 Lisp_Object instr, outstr, errstr;
|
|
|
249 get_process_streams (p, &instr, &outstr, &errstr);
|
|
428
|
250 assert (!NILP (instr));
|
|
|
251 return filedesc_stream_fd (XLSTREAM (instr));
|
|
|
252 }
|
|
|
253
|
|
853
|
254 static int
|
|
|
255 get_process_errfd (Lisp_Process *p)
|
|
428
|
256 {
|
|
853
|
257 Lisp_Object instr, outstr, errstr;
|
|
|
258 get_process_streams (p, &instr, &outstr, &errstr);
|
|
|
259 if (!NILP (errstr))
|
|
|
260 return filedesc_stream_fd (XLSTREAM (errstr));
|
|
|
261 else
|
|
|
262 return -1;
|
|
428
|
263 }
|
|
|
264
|
|
853
|
265 void
|
|
|
266 event_stream_unixoid_select_process (Lisp_Process *proc, int doin, int doerr,
|
|
|
267 int *infd, int *errfd)
|
|
428
|
268 {
|
|
853
|
269 if (doin)
|
|
|
270 {
|
|
|
271 *infd = get_process_infd (proc);
|
|
|
272 FD_SET (*infd, &input_wait_mask);
|
|
|
273 FD_SET (*infd, &non_fake_input_wait_mask);
|
|
|
274 FD_SET (*infd, &process_only_mask);
|
|
|
275 }
|
|
|
276
|
|
|
277 if (doerr)
|
|
|
278 {
|
|
|
279 *errfd = get_process_errfd (proc);
|
|
428
|
280
|
|
853
|
281 if (*errfd >= 0)
|
|
|
282 {
|
|
|
283 FD_SET (*errfd, &input_wait_mask);
|
|
|
284 FD_SET (*errfd, &non_fake_input_wait_mask);
|
|
|
285 FD_SET (*errfd, &process_only_mask);
|
|
|
286 }
|
|
|
287 }
|
|
|
288 }
|
|
|
289
|
|
|
290 void
|
|
|
291 event_stream_unixoid_unselect_process (Lisp_Process *proc, int doin, int doerr,
|
|
|
292 int *infd, int *errfd)
|
|
|
293 {
|
|
|
294 if (doin)
|
|
|
295 {
|
|
|
296 *infd = get_process_infd (proc);
|
|
|
297 FD_CLR (*infd, &input_wait_mask);
|
|
|
298 FD_CLR (*infd, &non_fake_input_wait_mask);
|
|
|
299 FD_CLR (*infd, &process_only_mask);
|
|
|
300 }
|
|
|
301
|
|
|
302 if (doerr)
|
|
|
303 {
|
|
|
304 *errfd = get_process_errfd (proc);
|
|
|
305
|
|
|
306 if (*errfd >= 0)
|
|
|
307 {
|
|
|
308 FD_CLR (*errfd, &input_wait_mask);
|
|
|
309 FD_CLR (*errfd, &non_fake_input_wait_mask);
|
|
|
310 FD_CLR (*errfd, &process_only_mask);
|
|
|
311 }
|
|
|
312 }
|
|
428
|
313 }
|
|
|
314
|
|
|
315 int
|
|
|
316 poll_fds_for_input (SELECT_TYPE mask)
|
|
|
317 {
|
|
|
318 EMACS_TIME sometime;
|
|
|
319 EMACS_SELECT_TIME select_time;
|
|
|
320 SELECT_TYPE temp_mask;
|
|
|
321 int retval;
|
|
|
322
|
|
|
323 while (1)
|
|
|
324 {
|
|
|
325 EMACS_SET_SECS_USECS (sometime, 0, 0);
|
|
|
326 EMACS_TIME_TO_SELECT_TIME (sometime, select_time);
|
|
|
327 temp_mask = mask;
|
|
|
328 /* To effect a poll, tell select() to block for zero seconds. */
|
|
|
329 retval = select (MAXDESC, &temp_mask, 0, 0, &select_time);
|
|
|
330 if (retval >= 0)
|
|
|
331 return retval;
|
|
|
332 if (errno != EINTR)
|
|
|
333 {
|
|
|
334 /* Something went seriously wrong; don't abort since maybe
|
|
|
335 the TTY just died at the wrong time. */
|
|
442
|
336 stderr_out ("xemacs: select failed: errno = %d\n", errno);
|
|
428
|
337 return 0;
|
|
|
338 }
|
|
|
339 /* else, we got interrupted by a signal, so try again. */
|
|
|
340 }
|
|
|
341
|
|
1204
|
342 RETURN_NOT_REACHED (0);
|
|
428
|
343 }
|
|
|
344
|
|
|
345 /****************************************************************************/
|
|
|
346 /* Unixoid (file descriptors based) process I/O streams routines */
|
|
|
347 /****************************************************************************/
|
|
|
348
|
|
853
|
349 void
|
|
|
350 event_stream_unixoid_create_io_streams (void* inhandle, void* outhandle,
|
|
|
351 void *errhandle, Lisp_Object* instream,
|
|
|
352 Lisp_Object* outstream,
|
|
|
353 Lisp_Object* errstream,
|
|
|
354 USID* in_usid,
|
|
|
355 USID* err_usid,
|
|
|
356 int flags)
|
|
428
|
357 {
|
|
853
|
358 int infd, outfd, errfd;
|
|
428
|
359 /* Decode inhandle and outhandle. Their meaning depends on
|
|
|
360 the process implementation being used. */
|
|
|
361 /* We are passed plain old file descs */
|
|
853
|
362 infd = (int) inhandle;
|
|
|
363 outfd = (int) outhandle;
|
|
|
364 errfd = (int) errhandle;
|
|
428
|
365
|
|
|
366 *instream = (infd >= 0
|
|
|
367 ? make_filedesc_input_stream (infd, 0, -1, 0)
|
|
|
368 : Qnil);
|
|
|
369
|
|
|
370 *outstream = (outfd >= 0
|
|
|
371 ? make_filedesc_output_stream (outfd, 0, -1, LSTR_BLOCKED_OK)
|
|
|
372 : Qnil);
|
|
|
373
|
|
853
|
374 *errstream = (errfd >= 0
|
|
|
375 ? make_filedesc_input_stream (errfd, 0, -1, 0)
|
|
|
376 : Qnil);
|
|
|
377
|
|
428
|
378 /* FLAGS is process->pty_flag for UNIX_PROCESSES */
|
|
|
379 if ((flags & STREAM_PTY_FLUSHING) && outfd >= 0)
|
|
|
380 {
|
|
867
|
381 Ibyte eof_char = get_eof_char (outfd);
|
|
428
|
382 int pty_max_bytes = get_pty_max_bytes (outfd);
|
|
853
|
383 filedesc_stream_set_pty_flushing (XLSTREAM (*outstream), pty_max_bytes,
|
|
|
384 eof_char);
|
|
428
|
385 }
|
|
|
386
|
|
853
|
387 *in_usid = FD_TO_USID (infd);
|
|
|
388 *err_usid = FD_TO_USID (errfd);
|
|
428
|
389 }
|
|
|
390
|
|
853
|
391 void
|
|
|
392 event_stream_unixoid_delete_io_streams (Lisp_Object instream,
|
|
|
393 Lisp_Object outstream,
|
|
|
394 Lisp_Object errstream,
|
|
|
395 USID *in_usid,
|
|
|
396 USID *err_usid)
|
|
428
|
397 {
|
|
853
|
398 int in = (NILP (instream) ? -1
|
|
428
|
399 : filedesc_stream_fd (XLSTREAM (instream)));
|
|
853
|
400 int out = (NILP (outstream) ? -1
|
|
428
|
401 : filedesc_stream_fd (XLSTREAM (outstream)));
|
|
853
|
402 int err = (NILP (errstream) ? -1
|
|
|
403 : filedesc_stream_fd (XLSTREAM (errstream)));
|
|
428
|
404
|
|
|
405 if (in >= 0)
|
|
771
|
406 retry_close (in);
|
|
428
|
407 if (out != in && out >= 0)
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771
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408 retry_close (out);
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853
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409 if (err != in && err != out && err >= 0)
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410 retry_close (err);
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428
|
411
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|
853
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412 *in_usid = FD_TO_USID (in);
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413 *err_usid = FD_TO_USID (err);
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428
|
414 }
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415
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|
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416
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|
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417 void
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|
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418 init_event_unixoid (void)
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|
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419 {
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420 /* Do this first; the init_event_*_late() functions
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|
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421 pay attention to it. */
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422 if (pipe (signal_event_pipe) < 0)
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423 {
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|
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424 perror ("XEmacs: can't open pipe");
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425 exit (-1);
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|
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426 }
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427 signal_event_pipe_initialized = 1;
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|
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428
|
|
|
429 /* Set it non-blocking so we can drain its output. */
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|
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430 set_descriptor_non_blocking (signal_event_pipe[0]);
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|
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431
|
|
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432 /* Also set the write descriptor non-blocking so we don't
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433 hang in case a long time passes between times when
|
|
|
434 we drain the pipe. */
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435 set_descriptor_non_blocking (signal_event_pipe[1]);
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436
|
|
|
437 /* WARNING: In order for the signal-event pipe to work correctly
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438 and not cause lockups, the following need to be followed:
|
|
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439
|
|
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440 1) event_pending_p() must ignore input on the signal-event pipe.
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|
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441 2) As soon as next_event() notices input on the signal-event
|
|
|
442 pipe, it must drain it. */
|
|
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443 FD_ZERO (&input_wait_mask);
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444 FD_ZERO (&non_fake_input_wait_mask);
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|
|
445 FD_ZERO (&process_only_mask);
|
|
|
446 FD_ZERO (&tty_only_mask);
|
|
|
447
|
|
|
448 FD_SET (signal_event_pipe[0], &input_wait_mask);
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|
|
449 }
|
