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380
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1 /* Asynchronous subprocess implementation for UNIX
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263
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2 Copyright (C) 1985, 1986, 1987, 1988, 1992, 1993, 1994, 1995
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3 Free Software Foundation, Inc.
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4 Copyright (C) 1995 Sun Microsystems, Inc.
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5 Copyright (C) 1995, 1996 Ben Wing.
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6
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7 This file is part of XEmacs.
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8
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9 XEmacs is free software; you can redistribute it and/or modify it
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10 under the terms of the GNU General Public License as published by the
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11 Free Software Foundation; either version 2, or (at your option) any
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12 later version.
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13
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14 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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15 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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17 for more details.
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18
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19 You should have received a copy of the GNU General Public License
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20 along with XEmacs; see the file COPYING. If not, write to
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21 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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22 Boston, MA 02111-1307, USA. */
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23
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24 /* This file has been Mule-ized except for `start-process-internal',
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25 `open-network-stream-internal' and `open-multicast-group-internal'. */
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26
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27 /* This file has been split into process.c and process-unix.c by
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28 Kirill M. Katsnelson <kkm@kis.ru>, so please bash him and not
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29 the original author(s) */
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30
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31 #include <config.h>
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32
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33 #if !defined (NO_SUBPROCESSES)
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34
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35 /* The entire file is within this conditional */
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36
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37 #include "lisp.h"
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38
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39 #include "buffer.h"
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40 #include "events.h"
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41 #include "frame.h"
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42 #include "hash.h"
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43 #include "lstream.h"
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44 #include "opaque.h"
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45 #include "process.h"
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46 #include "procimpl.h"
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47 #include "sysdep.h"
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48 #include "window.h"
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49 #ifdef FILE_CODING
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50 #include "file-coding.h"
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51 #endif
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52
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53 #include <setjmp.h>
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54 #include "sysfile.h"
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55 #include "sysproc.h"
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56 #include "systime.h"
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57 #include "syssignal.h" /* Always include before systty.h */
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58 #include "systty.h"
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59 #include "syswait.h"
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60
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61
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62 /*
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380
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63 * Implementation-specific data. Pointed to by Lisp_Process->process_data
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263
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64 */
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65
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66 struct unix_process_data
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67 {
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68 /* Non-0 if this is really a ToolTalk channel. */
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69 int connected_via_filedesc_p;
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70 /* Descriptor by which we read from this process. -1 for dead process */
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71 int infd;
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72 /* Descriptor for the tty which this process is using.
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73 -1 if we didn't record it (on some systems, there's no need). */
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74 int subtty;
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75 /* Name of subprocess terminal. */
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76 Lisp_Object tty_name;
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77 /* Non-false if communicating through a pty. */
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78 char pty_flag;
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79 };
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80
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81 #define UNIX_DATA(p) ((struct unix_process_data*)((p)->process_data))
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82
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83 #ifdef HAVE_PTYS
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84 /* The file name of the pty opened by allocate_pty. */
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85
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86 static char pty_name[24];
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87 #endif
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88
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89
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90
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91 /**********************************************************************/
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92 /* Static helper routines */
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93 /**********************************************************************/
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94
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95 static SIGTYPE
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96 close_safely_handler (int signo)
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97 {
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98 EMACS_REESTABLISH_SIGNAL (signo, close_safely_handler);
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99 SIGRETURN;
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100 }
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101
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102 static void
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103 close_safely (int fd)
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104 {
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105 stop_interrupts ();
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106 signal (SIGALRM, close_safely_handler);
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107 alarm (1);
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108 close (fd);
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109 alarm (0);
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110 start_interrupts ();
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111 }
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112
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113 static void
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114 close_descriptor_pair (int in, int out)
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115 {
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116 if (in >= 0)
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117 close (in);
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118 if (out != in && out >= 0)
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119 close (out);
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120 }
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121
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122 /* Close all descriptors currently in use for communication
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123 with subprocess. This is used in a newly-forked subprocess
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124 to get rid of irrelevant descriptors. */
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125
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126 static int
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127 close_process_descs_mapfun (CONST void* key, void* contents, void* arg)
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128 {
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129 Lisp_Object proc;
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130 CVOID_TO_LISP (proc, contents);
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131 event_stream_delete_stream_pair (XPROCESS(proc)->pipe_instream,
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132 XPROCESS(proc)->pipe_outstream);
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133 return 0;
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134 }
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135
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136 /* #### This function is currently called from child_setup
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137 in callproc.c. It should become static though - kkm */
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138 void
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139 close_process_descs (void)
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140 {
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141 maphash (close_process_descs_mapfun, usid_to_process, 0);
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142 }
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143
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144 /* connect to an existing file descriptor. This is very similar to
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145 open-network-stream except that it assumes that the connection has
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146 already been initialized. It is currently used for ToolTalk
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147 communication. */
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148
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149 /* This function used to be visible on the Lisp level, but there is no
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150 real point in doing that. Here is the doc string:
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151
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152 "Connect to an existing file descriptor.\n\
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153 Returns a subprocess-object to represent the connection.\n\
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154 Input and output work as for subprocesses; `delete-process' closes it.\n\
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155 Args are NAME BUFFER INFD OUTFD.\n\
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156 NAME is name for process. It is modified if necessary to make it unique.\n\
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157 BUFFER is the buffer (or buffer-name) to associate with the process.\n\
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158 Process output goes at end of that buffer, unless you specify\n\
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159 an output stream or filter function to handle the output.\n\
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160 BUFFER may be also nil, meaning that this process is not associated\n\
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161 with any buffer\n\
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162 INFD and OUTFD specify the file descriptors to use for input and\n\
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163 output, respectively."
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164 */
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165
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166 Lisp_Object
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167 connect_to_file_descriptor (Lisp_Object name, Lisp_Object buffer,
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168 Lisp_Object infd, Lisp_Object outfd)
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169 {
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170 /* This function can GC */
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171 Lisp_Object proc;
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172 int inch;
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173
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174 CHECK_STRING (name);
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175 CHECK_INT (infd);
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176 CHECK_INT (outfd);
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177
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178 inch = XINT (infd);
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179 if (get_process_from_usid (FD_TO_USID(inch)))
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180 error ("There is already a process connected to fd %d", inch);
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181 if (!NILP (buffer))
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182 buffer = Fget_buffer_create (buffer);
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183 proc = make_process_internal (name);
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184
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185 XPROCESS (proc)->pid = Fcons (infd, name);
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186 XPROCESS (proc)->buffer = buffer;
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187 init_process_io_handles (XPROCESS (proc), (void*)inch, (void*)XINT (outfd), 0);
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188 UNIX_DATA (XPROCESS (proc))->connected_via_filedesc_p = 1;
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189
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190 event_stream_select_process (XPROCESS (proc));
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191
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192 return proc;
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193 }
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194
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195 #ifdef HAVE_PTYS
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196
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197 /* Open an available pty, returning a file descriptor.
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198 Return -1 on failure.
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199 The file name of the terminal corresponding to the pty
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200 is left in the variable pty_name. */
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201
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202 static int
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203 allocate_pty (void)
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204 {
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278
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205 #ifndef PTY_OPEN
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263
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206 struct stat stb;
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207
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208 /* Some systems name their pseudoterminals so that there are gaps in
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209 the usual sequence - for example, on HP9000/S700 systems, there
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210 are no pseudoterminals with names ending in 'f'. So we wait for
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211 three failures in a row before deciding that we've reached the
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212 end of the ptys. */
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213 int failed_count = 0;
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278
|
214 #endif
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215 int i;
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216 int fd;
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217 int c;
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263
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218
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219 #ifdef PTY_ITERATION
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220 PTY_ITERATION
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221 #else
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222 for (c = FIRST_PTY_LETTER; c <= 'z'; c++)
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223 for (i = 0; i < 16; i++)
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224 #endif
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225 {
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226 #ifdef PTY_NAME_SPRINTF
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227 PTY_NAME_SPRINTF
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228 #else
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229 sprintf (pty_name, "/dev/pty%c%x", c, i);
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230 #endif /* no PTY_NAME_SPRINTF */
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231
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232 #ifdef PTY_OPEN
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233 PTY_OPEN;
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234 #else /* no PTY_OPEN */
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235 #ifdef IRIS
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236 /* Unusual IRIS code */
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380
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237 *ptyv = open ("/dev/ptc", O_RDWR | O_NONBLOCK | OPEN_BINARY, 0);
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263
|
238 if (fd < 0)
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239 return -1;
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240 if (fstat (fd, &stb) < 0)
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241 return -1;
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242 #else /* not IRIS */
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243 if (stat (pty_name, &stb) < 0)
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244 {
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245 failed_count++;
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246 if (failed_count >= 3)
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247 return -1;
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248 }
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249 else
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250 failed_count = 0;
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251 fd = open (pty_name, O_RDWR | O_NONBLOCK | OPEN_BINARY, 0);
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252 #endif /* not IRIS */
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253 #endif /* no PTY_OPEN */
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254
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255 if (fd >= 0)
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256 {
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|
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257 /* check to make certain that both sides are available
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258 this avoids a nasty yet stupid bug in rlogins */
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259 #ifdef PTY_TTY_NAME_SPRINTF
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260 PTY_TTY_NAME_SPRINTF
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261 #else
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262 sprintf (pty_name, "/dev/tty%c%x", c, i);
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263 #endif /* no PTY_TTY_NAME_SPRINTF */
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264 #ifndef UNIPLUS
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265 if (access (pty_name, 6) != 0)
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266 {
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267 close (fd);
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268 #if !defined(IRIS) && !defined(__sgi)
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269 continue;
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270 #else
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271 return -1;
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|
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272 #endif /* IRIS */
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|
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273 }
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|
|
274 #endif /* not UNIPLUS */
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275 setup_pty (fd);
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276 return fd;
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277 }
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278 }
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279 return -1;
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|
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280 }
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|
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281 #endif /* HAVE_PTYS */
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|
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282
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283 static int
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284 create_bidirectional_pipe (int *inchannel, int *outchannel,
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285 volatile int *forkin, volatile int *forkout)
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286 {
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|
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287 int sv[2];
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288
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|
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289 #ifdef SKTPAIR
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290 if (socketpair (AF_UNIX, SOCK_STREAM, 0, sv) < 0)
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291 return -1;
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292 *outchannel = *inchannel = sv[0];
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293 *forkout = *forkin = sv[1];
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294 #else /* not SKTPAIR */
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295 int temp;
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296 temp = pipe (sv);
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297 if (temp < 0) return -1;
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|
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298 *inchannel = sv[0];
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299 *forkout = sv[1];
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300 temp = pipe (sv);
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301 if (temp < 0) return -1;
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302 *outchannel = sv[1];
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303 *forkin = sv[0];
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304 #endif /* not SKTPAIR */
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305 return 0;
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|
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306 }
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|
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307
|
|
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308
|
|
|
309 #ifdef HAVE_SOCKETS
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|
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310
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|
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311 static int
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|
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312 get_internet_address (Lisp_Object host, struct sockaddr_in *address,
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|
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313 Error_behavior errb)
|
|
|
314 {
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|
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315 struct hostent *host_info_ptr = NULL;
|
|
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316 #ifdef TRY_AGAIN
|
|
|
317 int count = 0;
|
|
|
318 #endif
|
|
|
319
|
|
272
|
320 xzero (*address);
|
|
263
|
321
|
|
|
322 while (1)
|
|
|
323 {
|
|
|
324 #ifdef TRY_AGAIN
|
|
|
325 if (count++ > 10) break;
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|
|
326 #ifndef BROKEN_CYGWIN
|
|
272
|
327 h_errno = 0;
|
|
263
|
328 #endif
|
|
|
329 #endif
|
|
|
330 /* Some systems can't handle SIGIO/SIGALARM in gethostbyname. */
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|
|
331 slow_down_interrupts ();
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|
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332 host_info_ptr = gethostbyname ((char *) XSTRING_DATA (host));
|
|
|
333 speed_up_interrupts ();
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|
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334 #ifdef TRY_AGAIN
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|
|
335 if (! (host_info_ptr == 0 && h_errno == TRY_AGAIN))
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|
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336 #endif
|
|
|
337 break;
|
|
|
338 Fsleep_for (make_int (1));
|
|
|
339 }
|
|
|
340 if (host_info_ptr)
|
|
|
341 {
|
|
|
342 address->sin_family = host_info_ptr->h_addrtype;
|
|
|
343 memcpy (&address->sin_addr, host_info_ptr->h_addr, host_info_ptr->h_length);
|
|
|
344 }
|
|
|
345 else
|
|
|
346 {
|
|
|
347 IN_ADDR numeric_addr;
|
|
|
348 /* Attempt to interpret host as numeric inet address */
|
|
|
349 numeric_addr = inet_addr ((char *) XSTRING_DATA (host));
|
|
|
350 if (NUMERIC_ADDR_ERROR)
|
|
|
351 {
|
|
|
352 maybe_error (Qprocess, errb,
|
|
|
353 "Unknown host \"%s\"", XSTRING_DATA (host));
|
|
|
354 return 0;
|
|
|
355 }
|
|
|
356
|
|
|
357 /* There was some broken code here that called strlen() here
|
|
|
358 on (char *) &numeric_addr and even sometimes accessed
|
|
|
359 uninitialized data. */
|
|
|
360 address->sin_family = AF_INET;
|
|
|
361 * (IN_ADDR *) &address->sin_addr = numeric_addr;
|
|
|
362 }
|
|
|
363
|
|
|
364 return 1;
|
|
|
365 }
|
|
|
366
|
|
|
367 static void
|
|
|
368 set_socket_nonblocking_maybe (int fd, int port, CONST char* proto)
|
|
|
369 {
|
|
|
370 #ifdef PROCESS_IO_BLOCKING
|
|
|
371 Lisp_Object tail;
|
|
|
372
|
|
|
373 for (tail = network_stream_blocking_port_list; CONSP (tail); tail = XCDR (tail))
|
|
|
374 {
|
|
|
375 Lisp_Object tail_port = XCAR (tail);
|
|
|
376
|
|
|
377 if (STRINGP (tail_port))
|
|
|
378 {
|
|
|
379 struct servent *svc_info;
|
|
|
380 CHECK_STRING (tail_port);
|
|
|
381 svc_info = getservbyname ((char *) XSTRING_DATA (tail_port), proto);
|
|
|
382 if ((svc_info != 0) && (svc_info->s_port == port))
|
|
|
383 break;
|
|
|
384 else
|
|
|
385 continue;
|
|
|
386 }
|
|
|
387 else if ((INTP (tail_port)) && (htons ((unsigned short) XINT (tail_port)) == port))
|
|
|
388 break;
|
|
|
389 }
|
|
|
390
|
|
|
391 if (!CONSP (tail))
|
|
|
392 {
|
|
|
393 set_descriptor_non_blocking (fd);
|
|
|
394 }
|
|
|
395 #else
|
|
|
396 set_descriptor_non_blocking (fd);
|
|
|
397 #endif /* PROCESS_IO_BLOCKING */
|
|
|
398 }
|
|
|
399
|
|
|
400 #endif /* HAVE_SOCKETS */
|
|
|
401
|
|
|
402 /* Compute the Lisp form of the process status from
|
|
|
403 the numeric status that was returned by `wait'. */
|
|
|
404
|
|
|
405 static void
|
|
|
406 update_status_from_wait_code (struct Lisp_Process *p, int *w_fmh)
|
|
|
407 {
|
|
|
408 /* C compiler lossage when attempting to pass w directly */
|
|
|
409 int w = *w_fmh;
|
|
|
410
|
|
|
411 if (WIFSTOPPED (w))
|
|
|
412 {
|
|
|
413 p->status_symbol = Qstop;
|
|
|
414 p->exit_code = WSTOPSIG (w);
|
|
|
415 p->core_dumped = 0;
|
|
|
416 }
|
|
|
417 else if (WIFEXITED (w))
|
|
|
418 {
|
|
|
419 p->status_symbol = Qexit;
|
|
|
420 p->exit_code = WEXITSTATUS (w);
|
|
|
421 p->core_dumped = 0;
|
|
|
422 }
|
|
|
423 else if (WIFSIGNALED (w))
|
|
|
424 {
|
|
|
425 p->status_symbol = Qsignal;
|
|
|
426 p->exit_code = WTERMSIG (w);
|
|
|
427 p->core_dumped = WCOREDUMP (w);
|
|
|
428 }
|
|
|
429 else
|
|
|
430 {
|
|
|
431 p->status_symbol = Qrun;
|
|
|
432 p->exit_code = 0;
|
|
|
433 }
|
|
|
434 }
|
|
|
435
|
|
|
436 #ifdef SIGCHLD
|
|
|
437
|
|
|
438 #define MAX_EXITED_PROCESSES 1000
|
|
|
439 static volatile pid_t exited_processes[MAX_EXITED_PROCESSES];
|
|
|
440 static volatile int exited_processes_status[MAX_EXITED_PROCESSES];
|
|
|
441 static volatile int exited_processes_index;
|
|
|
442
|
|
|
443 static volatile int sigchld_happened;
|
|
|
444
|
|
|
445 /* On receipt of a signal that a child status has changed,
|
|
|
446 loop asking about children with changed statuses until
|
|
|
447 the system says there are no more. All we do is record
|
|
|
448 the processes and wait status.
|
|
|
449
|
|
|
450 This function could be called from within the SIGCHLD
|
|
|
451 handler, so it must be completely reentrant. When
|
|
|
452 not called from a SIGCHLD handler, BLOCK_SIGCHLD should
|
|
|
453 be non-zero so that SIGCHLD is blocked while this
|
|
|
454 function is running. (This is necessary so avoid
|
|
|
455 race conditions with the SIGCHLD_HAPPENED flag). */
|
|
|
456
|
|
|
457 static void
|
|
|
458 record_exited_processes (int block_sigchld)
|
|
|
459 {
|
|
|
460 if (!sigchld_happened)
|
|
|
461 {
|
|
|
462 return;
|
|
|
463 }
|
|
|
464
|
|
|
465 #ifdef EMACS_BLOCK_SIGNAL
|
|
|
466 if (block_sigchld)
|
|
|
467 EMACS_BLOCK_SIGNAL (SIGCHLD);
|
|
|
468 #endif
|
|
|
469
|
|
|
470 while (sigchld_happened)
|
|
|
471 {
|
|
|
472 int pid;
|
|
|
473 int w;
|
|
|
474
|
|
|
475 /* Keep trying to get a status until we get a definitive result. */
|
|
|
476 do
|
|
|
477 {
|
|
|
478 errno = 0;
|
|
|
479 #ifdef WNOHANG
|
|
|
480 # ifndef WUNTRACED
|
|
|
481 # define WUNTRACED 0
|
|
|
482 # endif /* not WUNTRACED */
|
|
|
483 # ifdef HAVE_WAITPID
|
|
|
484 pid = waitpid ((pid_t) -1, &w, WNOHANG | WUNTRACED);
|
|
|
485 # else
|
|
|
486 pid = wait3 (&w, WNOHANG | WUNTRACED, 0);
|
|
|
487 # endif
|
|
|
488 #else /* not WNOHANG */
|
|
|
489 pid = wait (&w);
|
|
|
490 #endif /* not WNOHANG */
|
|
|
491 }
|
|
|
492 while (pid <= 0 && errno == EINTR);
|
|
|
493
|
|
|
494 if (pid <= 0)
|
|
|
495 break;
|
|
|
496
|
|
|
497 if (exited_processes_index < MAX_EXITED_PROCESSES)
|
|
|
498 {
|
|
|
499 exited_processes[exited_processes_index] = pid;
|
|
|
500 exited_processes_status[exited_processes_index] = w;
|
|
|
501 exited_processes_index++;
|
|
|
502 }
|
|
|
503
|
|
|
504 /* On systems with WNOHANG, we just ignore the number
|
|
|
505 of times that SIGCHLD was signalled, and keep looping
|
|
|
506 until there are no more processes to wait on. If we
|
|
|
507 don't have WNOHANG, we have to rely on the count in
|
|
|
508 SIGCHLD_HAPPENED. */
|
|
|
509 #ifndef WNOHANG
|
|
|
510 sigchld_happened--;
|
|
|
511 #endif /* not WNOHANG */
|
|
|
512 }
|
|
|
513
|
|
|
514 sigchld_happened = 0;
|
|
|
515
|
|
|
516 if (block_sigchld)
|
|
|
517 EMACS_UNBLOCK_SIGNAL (SIGCHLD);
|
|
|
518 }
|
|
|
519
|
|
|
520 /* For any processes that have changed status and are recorded
|
|
|
521 and such, update the corresponding struct Lisp_Process.
|
|
|
522 We separate this from record_exited_processes() so that
|
|
|
523 we never have to call this function from within a signal
|
|
|
524 handler. We block SIGCHLD in case record_exited_processes()
|
|
|
525 is called from a signal handler. */
|
|
|
526
|
|
|
527 /** USG WARNING: Although it is not obvious from the documentation
|
|
|
528 in signal(2), on a USG system the SIGCLD handler MUST NOT call
|
|
|
529 signal() before executing at least one wait(), otherwise the handler
|
|
|
530 will be called again, resulting in an infinite loop. The relevant
|
|
|
531 portion of the documentation reads "SIGCLD signals will be queued
|
|
|
532 and the signal-catching function will be continually reentered until
|
|
|
533 the queue is empty". Invoking signal() causes the kernel to reexamine
|
|
|
534 the SIGCLD queue. Fred Fish, UniSoft Systems Inc.
|
|
|
535
|
|
|
536 (Note that now this only applies in SYS V Release 2 and before.
|
|
|
537 On SYS V Release 3, we use sigset() to set the signal handler for
|
|
|
538 the first time, and so we don't have to reestablish the signal handler
|
|
|
539 in the handler below. On SYS V Release 4, we don't get this weirdo
|
|
|
540 behavior when we use sigaction(), which we do use.) */
|
|
|
541
|
|
|
542 static SIGTYPE
|
|
|
543 sigchld_handler (int signo)
|
|
|
544 {
|
|
|
545 #ifdef OBNOXIOUS_SYSV_SIGCLD_BEHAVIOR
|
|
|
546 int old_errno = errno;
|
|
|
547
|
|
|
548 sigchld_happened++;
|
|
|
549 record_exited_processes (0);
|
|
|
550 errno = old_errno;
|
|
|
551 #else
|
|
|
552 sigchld_happened++;
|
|
|
553 #endif
|
|
|
554 #ifdef HAVE_UNIXOID_EVENT_LOOP
|
|
|
555 signal_fake_event ();
|
|
|
556 #endif
|
|
|
557 /* WARNING - must come after wait3() for USG systems */
|
|
|
558 EMACS_REESTABLISH_SIGNAL (signo, sigchld_handler);
|
|
|
559 SIGRETURN;
|
|
|
560 }
|
|
|
561
|
|
|
562 #endif /* SIGCHLD */
|
|
|
563
|
|
|
564 #ifdef SIGNALS_VIA_CHARACTERS
|
|
|
565 /* Get signal character to send to process if SIGNALS_VIA_CHARACTERS */
|
|
|
566
|
|
|
567 static int
|
|
|
568 process_signal_char (int tty_fd, int signo)
|
|
|
569 {
|
|
|
570 /* If it's not a tty, pray that these default values work */
|
|
|
571 if (!isatty(tty_fd)) {
|
|
|
572 #define CNTL(ch) (037 & (ch))
|
|
|
573 switch (signo)
|
|
|
574 {
|
|
|
575 case SIGINT: return CNTL('C');
|
|
|
576 case SIGQUIT: return CNTL('\\');
|
|
|
577 #ifdef SIGTSTP
|
|
|
578 case SIGTSTP: return CNTL('Z');
|
|
|
579 #endif
|
|
|
580 }
|
|
|
581 }
|
|
|
582
|
|
|
583 #ifdef HAVE_TERMIOS
|
|
|
584 /* TERMIOS is the latest and bestest, and seems most likely to work.
|
|
|
585 If the system has it, use it. */
|
|
|
586 {
|
|
|
587 struct termios t;
|
|
|
588 tcgetattr (tty_fd, &t);
|
|
|
589 switch (signo)
|
|
|
590 {
|
|
|
591 case SIGINT: return t.c_cc[VINTR];
|
|
|
592 case SIGQUIT: return t.c_cc[VQUIT];
|
|
284
|
593 #if defined(SIGTSTP) && defined(VSUSP)
|
|
263
|
594 case SIGTSTP: return t.c_cc[VSUSP];
|
|
284
|
595 #endif
|
|
263
|
596 }
|
|
|
597 }
|
|
|
598
|
|
|
599 # elif defined (TIOCGLTC) && defined (TIOCGETC) /* not HAVE_TERMIOS */
|
|
|
600 {
|
|
|
601 /* On Berkeley descendants, the following IOCTL's retrieve the
|
|
|
602 current control characters. */
|
|
|
603 struct tchars c;
|
|
|
604 struct ltchars lc;
|
|
|
605 switch (signo)
|
|
|
606 {
|
|
|
607 case SIGINT: ioctl (tty_fd, TIOCGETC, &c); return c.t_intrc;
|
|
|
608 case SIGQUIT: ioctl (tty_fd, TIOCGETC, &c); return c.t_quitc;
|
|
|
609 # ifdef SIGTSTP
|
|
|
610 case SIGTSTP: ioctl (tty_fd, TIOCGLTC, &lc); return lc.t_suspc;
|
|
|
611 # endif /* SIGTSTP */
|
|
|
612 }
|
|
|
613 }
|
|
|
614
|
|
|
615 # elif defined (TCGETA) /* ! defined (TIOCGLTC) && defined (TIOCGETC) */
|
|
|
616 {
|
|
|
617 /* On SYSV descendants, the TCGETA ioctl retrieves the current
|
|
|
618 control characters. */
|
|
|
619 struct termio t;
|
|
|
620 ioctl (tty_fd, TCGETA, &t);
|
|
|
621 switch (signo) {
|
|
|
622 case SIGINT: return t.c_cc[VINTR];
|
|
|
623 case SIGQUIT: return t.c_cc[VQUIT];
|
|
|
624 # ifdef SIGTSTP
|
|
|
625 case SIGTSTP: return t.c_cc[VSWTCH];
|
|
|
626 # endif /* SIGTSTP */
|
|
|
627 }
|
|
|
628 }
|
|
|
629 # else /* ! defined (TCGETA) */
|
|
|
630 #error ERROR! Using SIGNALS_VIA_CHARACTERS, but not HAVE_TERMIOS || (TIOCGLTC && TIOCGETC) || TCGETA
|
|
|
631 /* If your system configuration files define SIGNALS_VIA_CHARACTERS,
|
|
|
632 you'd better be using one of the alternatives above! */
|
|
|
633 # endif /* ! defined (TCGETA) */
|
|
|
634 return '\0';
|
|
|
635 }
|
|
|
636 #endif /* SIGNALS_VIA_CHARACTERS */
|
|
|
637
|
|
|
638
|
|
|
639
|
|
|
640
|
|
|
641 /**********************************************************************/
|
|
|
642 /* Process implementation methods */
|
|
|
643 /**********************************************************************/
|
|
|
644
|
|
272
|
645 /*
|
|
263
|
646 * Allocate and initialize Lisp_Process->process_data
|
|
|
647 */
|
|
|
648
|
|
|
649 static void
|
|
|
650 unix_alloc_process_data (struct Lisp_Process *p)
|
|
|
651 {
|
|
|
652 p->process_data = xnew (struct unix_process_data);
|
|
|
653
|
|
|
654 UNIX_DATA(p)->connected_via_filedesc_p = 0;
|
|
|
655 UNIX_DATA(p)->infd = -1;
|
|
|
656 UNIX_DATA(p)->subtty = -1;
|
|
|
657 UNIX_DATA(p)->tty_name = Qnil;
|
|
|
658 UNIX_DATA(p)->pty_flag = 0;
|
|
|
659 }
|
|
|
660
|
|
|
661 /*
|
|
|
662 * Mark any Lisp objects in Lisp_Process->process_data
|
|
|
663 */
|
|
|
664
|
|
|
665 static void
|
|
|
666 unix_mark_process_data (struct Lisp_Process *proc,
|
|
|
667 void (*markobj) (Lisp_Object))
|
|
|
668 {
|
|
380
|
669 markobj (UNIX_DATA(proc)->tty_name);
|
|
263
|
670 }
|
|
|
671
|
|
|
672 /*
|
|
380
|
673 * Initialize XEmacs process implementation once
|
|
263
|
674 */
|
|
|
675
|
|
|
676 #ifdef SIGCHLD
|
|
|
677 static void
|
|
|
678 unix_init_process (void)
|
|
|
679 {
|
|
|
680 #ifndef CANNOT_DUMP
|
|
|
681 if (! noninteractive || initialized)
|
|
|
682 #endif
|
|
|
683 signal (SIGCHLD, sigchld_handler);
|
|
|
684 }
|
|
|
685 #endif /* SIGCHLD */
|
|
|
686
|
|
|
687 /*
|
|
|
688 * Initialize any process local data. This is called when newly
|
|
|
689 * created process is connected to real OS file handles. The
|
|
|
690 * handles are generally represented by void* type, but are
|
|
|
691 * of type int (file descriptors) for UNIX
|
|
|
692 */
|
|
|
693
|
|
|
694 static void
|
|
|
695 unix_init_process_io_handles (struct Lisp_Process *p, void* in, void* out, int flags)
|
|
|
696 {
|
|
|
697 UNIX_DATA(p)->infd = (int)in;
|
|
|
698 }
|
|
|
699
|
|
|
700 /*
|
|
386
|
701 * Fork off a subprocess. P is a pointer to a newly created subprocess
|
|
263
|
702 * object. If this function signals, the caller is responsible for
|
|
272
|
703 * deleting (and finalizing) the process object.
|
|
263
|
704 *
|
|
380
|
705 * The method must return PID of the new process, a (positive??? ####) number
|
|
263
|
706 * which fits into Lisp_Int. No return value indicates an error, the method
|
|
|
707 * must signal an error instead.
|
|
|
708 */
|
|
|
709
|
|
|
710 static int
|
|
|
711 unix_create_process (struct Lisp_Process *p,
|
|
288
|
712 Lisp_Object *argv, int nargv,
|
|
|
713 Lisp_Object program, Lisp_Object cur_dir)
|
|
263
|
714 {
|
|
298
|
715 /* This function rewritten by ben@xemacs.org. */
|
|
263
|
716
|
|
386
|
717 int pid;
|
|
|
718 int inchannel = -1;
|
|
|
719 int outchannel = -1;
|
|
263
|
720 /* Use volatile to protect variables from being clobbered by longjmp. */
|
|
386
|
721 volatile int forkin = -1;
|
|
|
722 volatile int forkout = -1;
|
|
263
|
723 volatile int pty_flag = 0;
|
|
288
|
724
|
|
263
|
725 #ifdef HAVE_PTYS
|
|
|
726 if (!NILP (Vprocess_connection_type))
|
|
|
727 {
|
|
|
728 /* find a new pty, open the master side, return the opened
|
|
|
729 file handle, and store the name of the corresponding slave
|
|
|
730 side in global variable pty_name. */
|
|
|
731 outchannel = inchannel = allocate_pty ();
|
|
|
732 }
|
|
|
733
|
|
|
734 if (inchannel >= 0)
|
|
|
735 {
|
|
|
736 /* You're "supposed" to now open the slave in the child.
|
|
|
737 On some systems, we can open it here; this allows for
|
|
|
738 better error checking. */
|
|
|
739 #if !defined(USG)
|
|
|
740 /* On USG systems it does not work to open the pty's tty here
|
|
386
|
741 and then close and reopen it in the child. */
|
|
263
|
742 #ifdef O_NOCTTY
|
|
|
743 /* Don't let this terminal become our controlling terminal
|
|
|
744 (in case we don't have one). */
|
|
|
745 forkout = forkin = open (pty_name, O_RDWR | O_NOCTTY | OPEN_BINARY, 0);
|
|
|
746 #else
|
|
|
747 forkout = forkin = open (pty_name, O_RDWR | OPEN_BINARY, 0);
|
|
|
748 #endif
|
|
|
749 if (forkin < 0)
|
|
|
750 goto io_failure;
|
|
|
751 #endif /* not USG */
|
|
|
752 UNIX_DATA(p)->pty_flag = pty_flag = 1;
|
|
|
753 }
|
|
|
754 else
|
|
|
755 #endif /* HAVE_PTYS */
|
|
|
756 if (create_bidirectional_pipe (&inchannel, &outchannel,
|
|
|
757 &forkin, &forkout) < 0)
|
|
|
758 goto io_failure;
|
|
|
759
|
|
|
760 #if 0
|
|
|
761 /* Replaced by close_process_descs */
|
|
|
762 set_exclusive_use (inchannel);
|
|
|
763 set_exclusive_use (outchannel);
|
|
|
764 #endif
|
|
|
765
|
|
|
766 set_descriptor_non_blocking (inchannel);
|
|
|
767
|
|
|
768 /* Record this as an active process, with its channels.
|
|
|
769 As a result, child_setup will close Emacs's side of the pipes. */
|
|
282
|
770 init_process_io_handles (p, (void*)inchannel, (void*)outchannel,
|
|
|
771 pty_flag ? STREAM_PTY_FLUSHING : 0);
|
|
263
|
772 /* Record the tty descriptor used in the subprocess. */
|
|
|
773 UNIX_DATA(p)->subtty = forkin;
|
|
|
774
|
|
|
775 {
|
|
|
776 #if !defined(__CYGWIN32__)
|
|
|
777 /* child_setup must clobber environ on systems with true vfork.
|
|
|
778 Protect it from permanent change. */
|
|
|
779 char **save_environ = environ;
|
|
|
780 #endif
|
|
|
781
|
|
|
782 pid = fork ();
|
|
|
783 if (pid == 0)
|
|
|
784 {
|
|
|
785 /**** Now we're in the child process ****/
|
|
|
786 int xforkin = forkin;
|
|
|
787 int xforkout = forkout;
|
|
|
788
|
|
371
|
789 if (!pty_flag)
|
|
|
790 EMACS_SEPARATE_PROCESS_GROUP ();
|
|
|
791 #ifdef HAVE_PTYS
|
|
|
792 else
|
|
|
793 {
|
|
263
|
794 /* Disconnect the current controlling terminal, pursuant to
|
|
|
795 making the pty be the controlling terminal of the process.
|
|
|
796 Also put us in our own process group. */
|
|
|
797
|
|
|
798 disconnect_controlling_terminal ();
|
|
|
799
|
|
|
800 /* Open the pty connection and make the pty's terminal
|
|
|
801 our controlling terminal.
|
|
|
802
|
|
|
803 On systems with TIOCSCTTY, we just use it to set
|
|
|
804 the controlling terminal. On other systems, the
|
|
|
805 first TTY we open becomes the controlling terminal.
|
|
|
806 So, we end up with four possibilities:
|
|
|
807
|
|
|
808 (1) on USG and TIOCSCTTY systems, we open the pty
|
|
|
809 and use TIOCSCTTY.
|
|
|
810 (2) on other USG systems, we just open the pty.
|
|
|
811 (3) on non-USG systems with TIOCSCTTY, we
|
|
|
812 just use TIOCSCTTY. (On non-USG systems, we
|
|
|
813 already opened the pty in the parent process.)
|
|
|
814 (4) on non-USG systems without TIOCSCTTY, we
|
|
|
815 close the pty and reopen it.
|
|
|
816
|
|
|
817 This would be cleaner if we didn't open the pty
|
|
|
818 in the parent process, but doing it that way
|
|
|
819 makes it possible to trap error conditions.
|
|
|
820 It's harder to convey an error from the child
|
|
|
821 process, and I don't feel like messing with
|
|
|
822 this now. */
|
|
|
823
|
|
|
824 /* There was some weirdo, probably wrong,
|
|
|
825 conditionalization on RTU and UNIPLUS here.
|
|
|
826 I deleted it. So sue me. */
|
|
|
827
|
|
|
828 /* SunOS has TIOCSCTTY but the close/open method
|
|
|
829 also works. */
|
|
|
830
|
|
|
831 # if defined (USG) || !defined (TIOCSCTTY)
|
|
|
832 /* Now close the pty (if we had it open) and reopen it.
|
|
|
833 This makes the pty the controlling terminal of the
|
|
|
834 subprocess. */
|
|
|
835 /* I wonder if close (open (pty_name, ...)) would work? */
|
|
|
836 if (xforkin >= 0)
|
|
|
837 close (xforkin);
|
|
|
838 xforkout = xforkin = open (pty_name, O_RDWR | OPEN_BINARY, 0);
|
|
|
839 if (xforkin < 0)
|
|
|
840 {
|
|
|
841 write (1, "Couldn't open the pty terminal ", 31);
|
|
|
842 write (1, pty_name, strlen (pty_name));
|
|
|
843 write (1, "\n", 1);
|
|
|
844 _exit (1);
|
|
|
845 }
|
|
|
846 # endif /* USG or not TIOCSCTTY */
|
|
|
847
|
|
|
848 /* Miscellaneous setup required for some systems.
|
|
|
849 Must be done before using tc* functions on xforkin.
|
|
|
850 This guarantees that isatty(xforkin) is true. */
|
|
|
851
|
|
|
852 # ifdef SETUP_SLAVE_PTY
|
|
|
853 SETUP_SLAVE_PTY;
|
|
|
854 # endif /* SETUP_SLAVE_PTY */
|
|
|
855
|
|
|
856 # ifdef TIOCSCTTY
|
|
|
857 /* We ignore the return value
|
|
|
858 because faith@cs.unc.edu says that is necessary on Linux. */
|
|
|
859 assert (isatty (xforkin));
|
|
|
860 ioctl (xforkin, TIOCSCTTY, 0);
|
|
|
861 # endif /* TIOCSCTTY */
|
|
|
862
|
|
|
863 /* Change the line discipline. */
|
|
|
864
|
|
|
865 # if defined (HAVE_TERMIOS) && defined (LDISC1)
|
|
|
866 {
|
|
|
867 struct termios t;
|
|
|
868 assert (isatty (xforkin));
|
|
|
869 tcgetattr (xforkin, &t);
|
|
|
870 t.c_lflag = LDISC1;
|
|
|
871 if (tcsetattr (xforkin, TCSANOW, &t) < 0)
|
|
|
872 perror ("create_process/tcsetattr LDISC1 failed\n");
|
|
|
873 }
|
|
|
874 # elif defined (NTTYDISC) && defined (TIOCSETD)
|
|
|
875 {
|
|
|
876 /* Use new line discipline. TIOCSETD is accepted and
|
|
|
877 ignored on Sys5.4 systems with ttcompat. */
|
|
|
878 int ldisc = NTTYDISC;
|
|
|
879 assert (isatty (xforkin));
|
|
|
880 ioctl (xforkin, TIOCSETD, &ldisc);
|
|
|
881 }
|
|
|
882 # endif /* TIOCSETD & NTTYDISC */
|
|
|
883
|
|
|
884 /* Make our process group be the foreground group
|
|
|
885 of our new controlling terminal. */
|
|
|
886
|
|
|
887 {
|
|
|
888 int piddly = EMACS_GET_PROCESS_GROUP ();
|
|
|
889 EMACS_SET_TTY_PROCESS_GROUP (xforkin, &piddly);
|
|
|
890 }
|
|
|
891
|
|
|
892 /* On AIX, we've disabled SIGHUP above once we start a
|
|
|
893 child on a pty. Now reenable it in the child, so it
|
|
373
|
894 will die when we want it to.
|
|
|
895 JV: This needs to be done ALWAYS as we might have inherited
|
|
|
896 a SIG_IGN handling from our parent (nohup) and we are in new
|
|
380
|
897 process group.
|
|
373
|
898 */
|
|
263
|
899 signal (SIGHUP, SIG_DFL);
|
|
|
900 }
|
|
|
901
|
|
|
902 if (pty_flag)
|
|
386
|
903 /* Set up the terminal characteristics of the pty. */
|
|
|
904 child_setup_tty (xforkout);
|
|
|
905
|
|
|
906 #endif /* HAVE_PTYS */
|
|
|
907
|
|
|
908 signal (SIGINT, SIG_DFL);
|
|
|
909 signal (SIGQUIT, SIG_DFL);
|
|
|
910
|
|
|
911 {
|
|
|
912 char *current_dir;
|
|
|
913 char **new_argv = alloca_array (char *, nargv + 2);
|
|
|
914 int i;
|
|
263
|
915
|
|
386
|
916 /* Nothing below here GCs so our string pointers shouldn't move. */
|
|
|
917 new_argv[0] = (char *) XSTRING_DATA (program);
|
|
|
918 for (i = 0; i < nargv; i++)
|
|
|
919 {
|
|
|
920 CHECK_STRING (argv[i]);
|
|
|
921 new_argv[i + 1] = (char *) XSTRING_DATA (argv[i]);
|
|
|
922 }
|
|
|
923 new_argv[i + 1] = 0;
|
|
263
|
924
|
|
386
|
925 GET_C_STRING_FILENAME_DATA_ALLOCA (cur_dir, current_dir);
|
|
|
926
|
|
|
927 child_setup (xforkin, xforkout, xforkout, new_argv, current_dir);
|
|
|
928 }
|
|
|
929
|
|
|
930 } /**** End of child code ****/
|
|
|
931
|
|
|
932 /**** Back in parent process ****/
|
|
263
|
933 #if !defined(__CYGWIN32__)
|
|
|
934 environ = save_environ;
|
|
|
935 #endif
|
|
|
936 }
|
|
|
937
|
|
|
938 if (pid < 0)
|
|
|
939 {
|
|
|
940 close_descriptor_pair (forkin, forkout);
|
|
|
941 report_file_error ("Doing fork", Qnil);
|
|
|
942 }
|
|
|
943
|
|
|
944 /* #### dmoore - why is this commented out, otherwise we leave
|
|
|
945 subtty = forkin, but then we close forkin just below. */
|
|
|
946 /* UNIX_DATA(p)->subtty = -1; */
|
|
|
947
|
|
|
948 /* If the subfork execv fails, and it exits,
|
|
|
949 this close hangs. I don't know why.
|
|
|
950 So have an interrupt jar it loose. */
|
|
|
951 if (forkin >= 0)
|
|
|
952 close_safely (forkin);
|
|
|
953 if (forkin != forkout && forkout >= 0)
|
|
|
954 close (forkout);
|
|
|
955
|
|
|
956 #ifdef HAVE_PTYS
|
|
|
957 if (pty_flag)
|
|
|
958 UNIX_DATA (p)->tty_name = build_string (pty_name);
|
|
|
959 else
|
|
|
960 #endif
|
|
|
961 UNIX_DATA (p)->tty_name = Qnil;
|
|
|
962
|
|
|
963 /* Notice that SIGCHLD was not blocked. (This is not possible on
|
|
|
964 some systems.) No biggie if SIGCHLD occurs right around the
|
|
|
965 time that this call happens, because SIGCHLD() does not actually
|
|
|
966 deselect the process (that doesn't occur until the next time
|
|
|
967 we're waiting for an event, when status_notify() is called). */
|
|
|
968 return pid;
|
|
|
969
|
|
|
970 io_failure:
|
|
|
971 {
|
|
386
|
972 int save_errno = errno;
|
|
263
|
973 close_descriptor_pair (forkin, forkout);
|
|
|
974 close_descriptor_pair (inchannel, outchannel);
|
|
386
|
975 errno = save_errno;
|
|
263
|
976 report_file_error ("Opening pty or pipe", Qnil);
|
|
386
|
977 return 0; /* not reached */
|
|
263
|
978 }
|
|
|
979 }
|
|
|
980
|
|
380
|
981 /* Return nonzero if this process is a ToolTalk connection. */
|
|
263
|
982
|
|
|
983 static int
|
|
|
984 unix_tooltalk_connection_p (struct Lisp_Process *p)
|
|
|
985 {
|
|
|
986 return UNIX_DATA(p)->connected_via_filedesc_p;
|
|
|
987 }
|
|
|
988
|
|
380
|
989 /* This is called to set process' virtual terminal size */
|
|
263
|
990
|
|
|
991 static int
|
|
|
992 unix_set_window_size (struct Lisp_Process* p, int cols, int rows)
|
|
|
993 {
|
|
|
994 return set_window_size (UNIX_DATA(p)->infd, cols, rows);
|
|
|
995 }
|
|
|
996
|
|
|
997 /*
|
|
|
998 * This method is called to update status fields of the process
|
|
|
999 * structure. If the process has not existed, this method is
|
|
|
1000 * expected to do nothing.
|
|
|
1001 *
|
|
|
1002 * The method is called only for real child processes.
|
|
|
1003 */
|
|
|
1004
|
|
|
1005 #ifdef HAVE_WAITPID
|
|
|
1006 static void
|
|
|
1007 unix_update_status_if_terminated (struct Lisp_Process* p)
|
|
|
1008 {
|
|
|
1009 int w;
|
|
|
1010 #ifdef SIGCHLD
|
|
|
1011 EMACS_BLOCK_SIGNAL (SIGCHLD);
|
|
|
1012 #endif
|
|
|
1013 if (waitpid (XINT (p->pid), &w, WNOHANG) == XINT (p->pid))
|
|
|
1014 {
|
|
|
1015 p->tick++;
|
|
|
1016 update_status_from_wait_code (p, &w);
|
|
|
1017 }
|
|
|
1018 #ifdef SIGCHLD
|
|
|
1019 EMACS_UNBLOCK_SIGNAL (SIGCHLD);
|
|
|
1020 #endif
|
|
|
1021 }
|
|
|
1022 #endif
|
|
|
1023
|
|
|
1024 /*
|
|
|
1025 * Update status of all exited processes. Called when SIGCLD has signaled.
|
|
|
1026 */
|
|
|
1027
|
|
|
1028 #ifdef SIGCHLD
|
|
|
1029 static void
|
|
|
1030 unix_reap_exited_processes (void)
|
|
|
1031 {
|
|
|
1032 int i;
|
|
|
1033 struct Lisp_Process *p;
|
|
|
1034
|
|
|
1035 #ifndef OBNOXIOUS_SYSV_SIGCLD_BEHAVIOR
|
|
|
1036 record_exited_processes (1);
|
|
|
1037 #endif
|
|
|
1038
|
|
|
1039 if (exited_processes_index <= 0)
|
|
|
1040 {
|
|
|
1041 return;
|
|
|
1042 }
|
|
|
1043
|
|
|
1044 #ifdef EMACS_BLOCK_SIGNAL
|
|
|
1045 EMACS_BLOCK_SIGNAL (SIGCHLD);
|
|
|
1046 #endif
|
|
|
1047 for (i = 0; i < exited_processes_index; i++)
|
|
|
1048 {
|
|
|
1049 int pid = exited_processes[i];
|
|
|
1050 int w = exited_processes_status[i];
|
|
|
1051
|
|
|
1052 /* Find the process that signaled us, and record its status. */
|
|
|
1053
|
|
|
1054 p = 0;
|
|
|
1055 {
|
|
|
1056 Lisp_Object tail;
|
|
|
1057 LIST_LOOP (tail, Vprocess_list)
|
|
|
1058 {
|
|
|
1059 Lisp_Object proc = XCAR (tail);
|
|
|
1060 p = XPROCESS (proc);
|
|
|
1061 if (INTP (p->pid) && XINT (p->pid) == pid)
|
|
|
1062 break;
|
|
|
1063 p = 0;
|
|
|
1064 }
|
|
|
1065 }
|
|
|
1066
|
|
|
1067 if (p)
|
|
|
1068 {
|
|
|
1069 /* Change the status of the process that was found. */
|
|
|
1070 p->tick++;
|
|
|
1071 process_tick++;
|
|
|
1072 update_status_from_wait_code (p, &w);
|
|
|
1073
|
|
|
1074 /* If process has terminated, stop waiting for its output. */
|
|
|
1075 if (WIFSIGNALED (w) || WIFEXITED (w))
|
|
|
1076 {
|
|
|
1077 if (!NILP(p->pipe_instream))
|
|
|
1078 {
|
|
|
1079 /* We can't just call event_stream->unselect_process_cb (p)
|
|
|
1080 here, because that calls XtRemoveInput, which is not
|
|
|
1081 necessarily reentrant, so we can't call this at interrupt
|
|
|
1082 level.
|
|
|
1083 */
|
|
|
1084 }
|
|
|
1085 }
|
|
|
1086 }
|
|
|
1087 else
|
|
|
1088 {
|
|
|
1089 /* There was no asynchronous process found for that id. Check
|
|
|
1090 if we have a synchronous process. Only set sync process status
|
|
|
1091 if there is one, so we work OK with the waitpid() call in
|
|
|
1092 wait_for_termination(). */
|
|
|
1093 if (synch_process_alive != 0)
|
|
|
1094 { /* Set the global sync process status variables. */
|
|
|
1095 synch_process_alive = 0;
|
|
|
1096
|
|
|
1097 /* Report the status of the synchronous process. */
|
|
|
1098 if (WIFEXITED (w))
|
|
|
1099 synch_process_retcode = WEXITSTATUS (w);
|
|
|
1100 else if (WIFSIGNALED (w))
|
|
|
1101 synch_process_death = signal_name (WTERMSIG (w));
|
|
|
1102 }
|
|
|
1103 }
|
|
|
1104 }
|
|
|
1105
|
|
|
1106 exited_processes_index = 0;
|
|
|
1107
|
|
|
1108 EMACS_UNBLOCK_SIGNAL (SIGCHLD);
|
|
|
1109 }
|
|
|
1110 #endif /* SIGCHLD */
|
|
|
1111
|
|
|
1112 /*
|
|
380
|
1113 * Stuff the entire contents of LSTREAM to the process output pipe
|
|
263
|
1114 */
|
|
|
1115
|
|
|
1116 static JMP_BUF send_process_frame;
|
|
|
1117
|
|
|
1118 static SIGTYPE
|
|
|
1119 send_process_trap (int signum)
|
|
|
1120 {
|
|
|
1121 EMACS_REESTABLISH_SIGNAL (signum, send_process_trap);
|
|
|
1122 EMACS_UNBLOCK_SIGNAL (signum);
|
|
|
1123 LONGJMP (send_process_frame, 1);
|
|
|
1124 }
|
|
|
1125
|
|
|
1126 static void
|
|
272
|
1127 unix_send_process (Lisp_Object proc, struct lstream* lstream)
|
|
263
|
1128 {
|
|
|
1129 /* Use volatile to protect variables from being clobbered by longjmp. */
|
|
|
1130 SIGTYPE (*volatile old_sigpipe) (int) = 0;
|
|
272
|
1131 volatile Lisp_Object vol_proc = proc;
|
|
|
1132 struct Lisp_Process *volatile p = XPROCESS (proc);
|
|
|
1133
|
|
263
|
1134 if (!SETJMP (send_process_frame))
|
|
|
1135 {
|
|
|
1136 /* use a reasonable-sized buffer (somewhere around the size of the
|
|
|
1137 stream buffer) so as to avoid inundating the stream with blocked
|
|
|
1138 data. */
|
|
|
1139 Bufbyte chunkbuf[512];
|
|
|
1140 Bytecount chunklen;
|
|
|
1141
|
|
|
1142 while (1)
|
|
|
1143 {
|
|
|
1144 int writeret;
|
|
|
1145
|
|
|
1146 chunklen = Lstream_read (lstream, chunkbuf, 512);
|
|
|
1147 if (chunklen <= 0)
|
|
|
1148 break; /* perhaps should abort() if < 0?
|
|
|
1149 This should never happen. */
|
|
|
1150 old_sigpipe =
|
|
|
1151 (SIGTYPE (*) (int)) signal (SIGPIPE, send_process_trap);
|
|
|
1152 /* Lstream_write() will never successfully write less than
|
|
|
1153 the amount sent in. In the worst case, it just buffers
|
|
|
1154 the unwritten data. */
|
|
|
1155 writeret = Lstream_write (XLSTREAM (DATA_OUTSTREAM(p)), chunkbuf,
|
|
|
1156 chunklen);
|
|
|
1157 signal (SIGPIPE, old_sigpipe);
|
|
|
1158 if (writeret < 0)
|
|
|
1159 /* This is a real error. Blocking errors are handled
|
|
|
1160 specially inside of the filedesc stream. */
|
|
380
|
1161 report_file_error ("writing to process", list1 (proc));
|
|
263
|
1162 while (Lstream_was_blocked_p (XLSTREAM (p->pipe_outstream)))
|
|
|
1163 {
|
|
|
1164 /* Buffer is full. Wait, accepting input;
|
|
|
1165 that may allow the program
|
|
|
1166 to finish doing output and read more. */
|
|
|
1167 Faccept_process_output (Qnil, make_int (1), Qnil);
|
|
|
1168 old_sigpipe =
|
|
|
1169 (SIGTYPE (*) (int)) signal (SIGPIPE, send_process_trap);
|
|
|
1170 Lstream_flush (XLSTREAM (p->pipe_outstream));
|
|
|
1171 signal (SIGPIPE, old_sigpipe);
|
|
|
1172 }
|
|
|
1173 }
|
|
|
1174 }
|
|
|
1175 else
|
|
|
1176 { /* We got here from a longjmp() from the SIGPIPE handler */
|
|
|
1177 signal (SIGPIPE, old_sigpipe);
|
|
375
|
1178 /* Close the file lstream so we don't attempt to write to it further */
|
|
|
1179 /* #### There is controversy over whether this might cause fd leakage */
|
|
|
1180 /* my tests say no. -slb */
|
|
|
1181 XLSTREAM (p->pipe_outstream)->flags &= ~LSTREAM_FL_IS_OPEN;
|
|
263
|
1182 p->status_symbol = Qexit;
|
|
|
1183 p->exit_code = 256; /* #### SIGPIPE ??? */
|
|
|
1184 p->core_dumped = 0;
|
|
|
1185 p->tick++;
|
|
|
1186 process_tick++;
|
|
380
|
1187 deactivate_process (*((Lisp_Object *) (&vol_proc)));
|
|
263
|
1188 error ("SIGPIPE raised on process %s; closed it",
|
|
|
1189 XSTRING_DATA (p->name));
|
|
|
1190 }
|
|
272
|
1191
|
|
263
|
1192 old_sigpipe = (SIGTYPE (*) (int)) signal (SIGPIPE, send_process_trap);
|
|
|
1193 Lstream_flush (XLSTREAM (DATA_OUTSTREAM(p)));
|
|
|
1194 signal (SIGPIPE, old_sigpipe);
|
|
|
1195 }
|
|
|
1196
|
|
|
1197 /*
|
|
|
1198 * Send EOF to the process. The default implementation simply
|
|
|
1199 * closes the output stream. The method must return 0 to call
|
|
|
1200 * the default implementation, or 1 if it has taken all care about
|
|
|
1201 * sending EOF to the process.
|
|
|
1202 */
|
|
|
1203
|
|
|
1204 static int
|
|
|
1205 unix_process_send_eof (Lisp_Object proc)
|
|
|
1206 {
|
|
|
1207 if (!UNIX_DATA (XPROCESS (proc))->pty_flag)
|
|
|
1208 return 0;
|
|
|
1209
|
|
|
1210 /* #### get_eof_char simply doesn't return the correct character
|
|
|
1211 here. Maybe it is needed to determine the right eof
|
|
|
1212 character in init_process_io_handles but here it simply screws
|
|
|
1213 things up. */
|
|
|
1214 #if 0
|
|
|
1215 Bufbyte eof_char = get_eof_char (XPROCESS (proc));
|
|
|
1216 send_process (proc, Qnil, &eof_char, 0, 1);
|
|
|
1217 #else
|
|
|
1218 send_process (proc, Qnil, (CONST Bufbyte *) "\004", 0, 1);
|
|
|
1219 #endif
|
|
|
1220 return 1;
|
|
|
1221 }
|
|
|
1222
|
|
|
1223 /*
|
|
|
1224 * Called before the process is deactivated. The process object
|
|
|
1225 * is not immediately finalized, just undergoes a transition to
|
|
|
1226 * inactive state.
|
|
|
1227 *
|
|
|
1228 * The return value is a unique stream ID, as returned by
|
|
|
1229 * event_stream_delete_stream_pair
|
|
|
1230 *
|
|
|
1231 * In the lack of this method, only event_stream_delete_stream_pair
|
|
|
1232 * is called on both I/O streams of the process.
|
|
|
1233 *
|
|
380
|
1234 * The UNIX version guards this by ignoring possible SIGPIPE.
|
|
263
|
1235 */
|
|
|
1236
|
|
|
1237 static USID
|
|
|
1238 unix_deactivate_process (struct Lisp_Process *p)
|
|
|
1239 {
|
|
|
1240 SIGTYPE (*old_sigpipe) (int) = 0;
|
|
|
1241 USID usid;
|
|
|
1242
|
|
|
1243 if (UNIX_DATA(p)->infd >= 0)
|
|
|
1244 flush_pending_output (UNIX_DATA(p)->infd);
|
|
|
1245
|
|
|
1246 /* closing the outstream could result in SIGPIPE, so ignore it. */
|
|
|
1247 old_sigpipe = (SIGTYPE (*) (int)) signal (SIGPIPE, SIG_IGN);
|
|
|
1248 usid = event_stream_delete_stream_pair (p->pipe_instream, p->pipe_outstream);
|
|
|
1249 signal (SIGPIPE, old_sigpipe);
|
|
272
|
1250
|
|
263
|
1251 UNIX_DATA(p)->infd = -1;
|
|
|
1252
|
|
|
1253 return usid;
|
|
|
1254 }
|
|
|
1255
|
|
371
|
1256 /* send a signal number SIGNO to PROCESS.
|
|
263
|
1257 CURRENT_GROUP means send to the process group that currently owns
|
|
|
1258 the terminal being used to communicate with PROCESS.
|
|
|
1259 This is used for various commands in shell mode.
|
|
|
1260 If NOMSG is zero, insert signal-announcements into process's buffers
|
|
|
1261 right away.
|
|
|
1262
|
|
|
1263 If we can, we try to signal PROCESS by sending control characters
|
|
|
1264 down the pty. This allows us to signal inferiors who have changed
|
|
371
|
1265 their uid, for which killpg would return an EPERM error.
|
|
263
|
1266
|
|
371
|
1267 The method signals an error if the given SIGNO is not valid
|
|
|
1268 */
|
|
263
|
1269
|
|
|
1270 static void
|
|
|
1271 unix_kill_child_process (Lisp_Object proc, int signo,
|
|
|
1272 int current_group, int nomsg)
|
|
|
1273 {
|
|
371
|
1274 int gid;
|
|
|
1275 int no_pgrp = 0;
|
|
|
1276 int kill_retval;
|
|
263
|
1277 struct Lisp_Process *p = XPROCESS (proc);
|
|
371
|
1278
|
|
|
1279 if (!UNIX_DATA(p)->pty_flag)
|
|
|
1280 current_group = 0;
|
|
|
1281
|
|
|
1282 /* If we are using pgrps, get a pgrp number and make it negative. */
|
|
|
1283 if (current_group)
|
|
|
1284 {
|
|
|
1285 #ifdef SIGNALS_VIA_CHARACTERS
|
|
|
1286 /* If possible, send signals to the entire pgrp
|
|
|
1287 by sending an input character to it. */
|
|
|
1288 {
|
|
|
1289 char sigchar = process_signal_char(UNIX_DATA(p)->subtty, signo);
|
|
|
1290 if (sigchar) {
|
|
|
1291 send_process (proc, Qnil, (Bufbyte *) &sigchar, 0, 1);
|
|
|
1292 return;
|
|
|
1293 }
|
|
|
1294 }
|
|
|
1295 #endif /* ! defined (SIGNALS_VIA_CHARACTERS) */
|
|
|
1296
|
|
|
1297 #ifdef TIOCGPGRP
|
|
|
1298 /* Get the pgrp using the tty itself, if we have that.
|
|
|
1299 Otherwise, use the pty to get the pgrp.
|
|
|
1300 On pfa systems, saka@pfu.fujitsu.co.JP writes:
|
|
|
1301 "TIOCGPGRP symbol defined in sys/ioctl.h at E50.
|
|
|
1302 But, TIOCGPGRP does not work on E50 ;-P works fine on E60"
|
|
|
1303 His patch indicates that if TIOCGPGRP returns an error, then
|
|
|
1304 we should just assume that p->pid is also the process group id. */
|
|
|
1305 {
|
|
|
1306 int err;
|
|
|
1307
|
|
|
1308 err = ioctl ( (UNIX_DATA(p)->subtty != -1
|
|
|
1309 ? UNIX_DATA(p)->subtty
|
|
|
1310 : UNIX_DATA(p)->infd), TIOCGPGRP, &gid);
|
|
|
1311
|
|
|
1312 #ifdef pfa
|
|
|
1313 if (err == -1)
|
|
|
1314 gid = - XINT (p->pid);
|
|
|
1315 #endif /* ! defined (pfa) */
|
|
|
1316 }
|
|
|
1317 if (gid == -1)
|
|
|
1318 no_pgrp = 1;
|
|
|
1319 else
|
|
|
1320 gid = - gid;
|
|
|
1321 #else /* ! defined (TIOCGPGRP ) */
|
|
|
1322 /* Can't select pgrps on this system, so we know that
|
|
|
1323 the child itself heads the pgrp. */
|
|
|
1324 gid = - XINT (p->pid);
|
|
|
1325 #endif /* ! defined (TIOCGPGRP ) */
|
|
|
1326 }
|
|
|
1327 else
|
|
|
1328 gid = - XINT (p->pid);
|
|
263
|
1329
|
|
|
1330 switch (signo)
|
|
|
1331 {
|
|
|
1332 #ifdef SIGCONT
|
|
|
1333 case SIGCONT:
|
|
|
1334 p->status_symbol = Qrun;
|
|
|
1335 p->exit_code = 0;
|
|
|
1336 p->tick++;
|
|
|
1337 process_tick++;
|
|
|
1338 if (!nomsg)
|
|
|
1339 status_notify ();
|
|
|
1340 break;
|
|
|
1341 #endif /* ! defined (SIGCONT) */
|
|
|
1342 case SIGINT:
|
|
|
1343 case SIGQUIT:
|
|
|
1344 case SIGKILL:
|
|
371
|
1345 flush_pending_output (UNIX_DATA(p)->infd);
|
|
263
|
1346 break;
|
|
|
1347 }
|
|
|
1348
|
|
371
|
1349 /* If we don't have process groups, send the signal to the immediate
|
|
|
1350 subprocess. That isn't really right, but it's better than any
|
|
|
1351 obvious alternative. */
|
|
|
1352 if (no_pgrp)
|
|
263
|
1353 {
|
|
371
|
1354 kill_retval = kill (XINT (p->pid), signo) ? errno : 0;
|
|
|
1355 }
|
|
|
1356 else
|
|
263
|
1357 {
|
|
371
|
1358 /* gid may be a pid, or minus a pgrp's number */
|
|
|
1359 #if defined (TIOCSIGNAL) || defined (TIOCSIGSEND)
|
|
|
1360 if (current_group)
|
|
369
|
1361 {
|
|
371
|
1362 #ifdef TIOCSIGNAL
|
|
|
1363 kill_retval = ioctl (UNIX_DATA(p)->infd, TIOCSIGNAL, signo);
|
|
|
1364 #else /* ! defined (TIOCSIGNAL) */
|
|
|
1365 kill_retval = ioctl (UNIX_DATA(p)->infd, TIOCSIGSEND, signo);
|
|
|
1366 #endif /* ! defined (TIOCSIGNAL) */
|
|
369
|
1367 }
|
|
371
|
1368 else
|
|
|
1369 kill_retval = kill (- XINT (p->pid), signo) ? errno : 0;
|
|
|
1370 #else /* ! (defined (TIOCSIGNAL) || defined (TIOCSIGSEND)) */
|
|
|
1371 kill_retval = EMACS_KILLPG (-gid, signo) ? errno : 0;
|
|
|
1372 #endif /* ! (defined (TIOCSIGNAL) || defined (TIOCSIGSEND)) */
|
|
|
1373 }
|
|
369
|
1374
|
|
371
|
1375 if (kill_retval < 0 && errno == EINVAL)
|
|
|
1376 error ("Signal number %d is invalid for this system", signo);
|
|
272
|
1377 }
|
|
263
|
1378
|
|
|
1379 /*
|
|
|
1380 * Kill any process in the system given its PID.
|
|
|
1381 *
|
|
|
1382 * Returns zero if a signal successfully sent, or
|
|
|
1383 * negative number upon failure
|
|
|
1384 */
|
|
|
1385
|
|
|
1386 static int
|
|
|
1387 unix_kill_process_by_pid (int pid, int sigcode)
|
|
|
1388 {
|
|
|
1389 return kill (pid, sigcode);
|
|
|
1390 }
|
|
|
1391
|
|
|
1392 /*
|
|
|
1393 * Return TTY name used to communicate with subprocess
|
|
|
1394 */
|
|
|
1395
|
|
|
1396 static Lisp_Object
|
|
|
1397 unix_get_tty_name (struct Lisp_Process *p)
|
|
|
1398 {
|
|
|
1399 return UNIX_DATA (p)->tty_name;
|
|
|
1400 }
|
|
|
1401
|
|
|
1402 /*
|
|
|
1403 * Canonicalize host name HOST, and return its canonical form
|
|
|
1404 *
|
|
380
|
1405 * The default implementation just takes HOST for a canonical name.
|
|
263
|
1406 */
|
|
|
1407
|
|
|
1408 #ifdef HAVE_SOCKETS
|
|
|
1409 static Lisp_Object
|
|
|
1410 unix_canonicalize_host_name (Lisp_Object host)
|
|
|
1411 {
|
|
|
1412 struct sockaddr_in address;
|
|
|
1413
|
|
|
1414 if (!get_internet_address (host, &address, ERROR_ME_NOT))
|
|
|
1415 return host;
|
|
|
1416
|
|
|
1417 if (address.sin_family == AF_INET)
|
|
|
1418 return build_string (inet_ntoa (address.sin_addr));
|
|
|
1419 else
|
|
|
1420 /* #### any clue what to do here? */
|
|
|
1421 return host;
|
|
272
|
1422 }
|
|
263
|
1423
|
|
|
1424 /* open a TCP network connection to a given HOST/SERVICE. Treated
|
|
|
1425 exactly like a normal process when reading and writing. Only
|
|
|
1426 differences are in status display and process deletion. A network
|
|
|
1427 connection has no PID; you cannot signal it. All you can do is
|
|
|
1428 deactivate and close it via delete-process */
|
|
|
1429
|
|
|
1430 static void
|
|
|
1431 unix_open_network_stream (Lisp_Object name, Lisp_Object host, Lisp_Object service,
|
|
|
1432 Lisp_Object family, void** vinfd, void** voutfd)
|
|
|
1433 {
|
|
|
1434 struct sockaddr_in address;
|
|
|
1435 int s, inch, outch;
|
|
|
1436 volatile int port;
|
|
|
1437 volatile int retry = 0;
|
|
|
1438 int retval;
|
|
272
|
1439
|
|
263
|
1440 CHECK_STRING (host);
|
|
|
1441
|
|
|
1442 if (!EQ (family, Qtcpip))
|
|
|
1443 error ("Unsupported protocol family \"%s\"",
|
|
|
1444 string_data (symbol_name (XSYMBOL (family))));
|
|
|
1445
|
|
|
1446 if (INTP (service))
|
|
|
1447 port = htons ((unsigned short) XINT (service));
|
|
|
1448 else
|
|
|
1449 {
|
|
|
1450 struct servent *svc_info;
|
|
|
1451 CHECK_STRING (service);
|
|
|
1452 svc_info = getservbyname ((char *) XSTRING_DATA (service), "tcp");
|
|
|
1453 if (svc_info == 0)
|
|
|
1454 error ("Unknown service \"%s\"", XSTRING_DATA (service));
|
|
|
1455 port = svc_info->s_port;
|
|
|
1456 }
|
|
|
1457
|
|
|
1458 get_internet_address (host, &address, ERROR_ME);
|
|
|
1459 address.sin_port = port;
|
|
|
1460
|
|
|
1461 s = socket (address.sin_family, SOCK_STREAM, 0);
|
|
|
1462 if (s < 0)
|
|
|
1463 report_file_error ("error creating socket", list1 (name));
|
|
|
1464
|
|
|
1465 /* Turn off interrupts here -- see comments below. There used to
|
|
|
1466 be code which called bind_polling_period() to slow the polling
|
|
|
1467 period down rather than turn it off, but that seems rather
|
|
|
1468 bogus to me. Best thing here is to use a non-blocking connect
|
|
|
1469 or something, to check for QUIT. */
|
|
|
1470
|
|
|
1471 /* Comments that are not quite valid: */
|
|
|
1472
|
|
|
1473 /* Kernel bugs (on Ultrix at least) cause lossage (not just EINTR)
|
|
|
1474 when connect is interrupted. So let's not let it get interrupted.
|
|
|
1475 Note we do not turn off polling, because polling is only used
|
|
|
1476 when not interrupt_input, and thus not normally used on the systems
|
|
|
1477 which have this bug. On systems which use polling, there's no way
|
|
|
1478 to quit if polling is turned off. */
|
|
|
1479
|
|
|
1480 /* Slow down polling. Some kernels have a bug which causes retrying
|
|
|
1481 connect to fail after a connect. */
|
|
|
1482
|
|
|
1483 slow_down_interrupts ();
|
|
|
1484
|
|
|
1485 loop:
|
|
|
1486
|
|
|
1487 /* A system call interrupted with a SIGALRM or SIGIO comes back
|
|
|
1488 here, with can_break_system_calls reset to 0. */
|
|
|
1489 SETJMP (break_system_call_jump);
|
|
|
1490 if (QUITP)
|
|
|
1491 {
|
|
|
1492 speed_up_interrupts ();
|
|
|
1493 REALLY_QUIT;
|
|
|
1494 /* In case something really weird happens ... */
|
|
|
1495 slow_down_interrupts ();
|
|
|
1496 }
|
|
|
1497
|
|
|
1498 /* Break out of connect with a signal (it isn't otherwise possible).
|
|
|
1499 Thus you don't get screwed with a hung network. */
|
|
|
1500 can_break_system_calls = 1;
|
|
|
1501 retval = connect (s, (struct sockaddr *) &address, sizeof (address));
|
|
|
1502 can_break_system_calls = 0;
|
|
|
1503 if (retval == -1 && errno != EISCONN)
|
|
|
1504 {
|
|
|
1505 int xerrno = errno;
|
|
|
1506 if (errno == EINTR)
|
|
|
1507 goto loop;
|
|
|
1508 if (errno == EADDRINUSE && retry < 20)
|
|
|
1509 {
|
|
|
1510 /* A delay here is needed on some FreeBSD systems,
|
|
|
1511 and it is harmless, since this retrying takes time anyway
|
|
|
1512 and should be infrequent.
|
|
|
1513 `sleep-for' allowed for quitting this loop with interrupts
|
|
|
1514 slowed down so it can't be used here. Async timers should
|
|
|
1515 already be disabled at this point so we can use `sleep'. */
|
|
|
1516 sleep (1);
|
|
|
1517 retry++;
|
|
|
1518 goto loop;
|
|
|
1519 }
|
|
|
1520
|
|
|
1521 close (s);
|
|
|
1522
|
|
|
1523 speed_up_interrupts ();
|
|
|
1524
|
|
|
1525 errno = xerrno;
|
|
|
1526 report_file_error ("connection failed", list2 (host, name));
|
|
|
1527 }
|
|
|
1528
|
|
|
1529 speed_up_interrupts ();
|
|
|
1530
|
|
|
1531 inch = s;
|
|
|
1532 outch = dup (s);
|
|
|
1533 if (outch < 0)
|
|
|
1534 {
|
|
|
1535 close (s); /* this used to be leaked; from Kyle Jones */
|
|
|
1536 report_file_error ("error duplicating socket", list1 (name));
|
|
|
1537 }
|
|
|
1538
|
|
|
1539 set_socket_nonblocking_maybe (inch, port, "tcp");
|
|
|
1540
|
|
|
1541 *vinfd = (void*)inch;
|
|
|
1542 *voutfd = (void*)outch;
|
|
272
|
1543 }
|
|
263
|
1544
|
|
|
1545
|
|
|
1546 #ifdef HAVE_MULTICAST
|
|
|
1547
|
|
|
1548 /* Didier Verna <verna@inf.enst.fr> Nov. 28 1997.
|
|
|
1549
|
|
|
1550 This function is similar to open-network-stream-internal, but provides a
|
|
|
1551 mean to open an UDP multicast connection instead of a TCP one. Like in the
|
|
|
1552 TCP case, the multicast connection will be seen as a sub-process,
|
|
|
1553
|
|
|
1554 Some notes:
|
|
380
|
1555 - Normally, we should use sendto and recvfrom with non connected
|
|
263
|
1556 sockets. The current code doesn't allow us to do this. In the future, it
|
|
|
1557 would be a good idea to extend the process data structure in order to deal
|
|
|
1558 properly with the different types network connections.
|
|
|
1559 - For the same reason, when leaving a multicast group, it is better to make
|
|
|
1560 a setsockopt - IP_DROP_MEMBERSHIP before closing the descriptors.
|
|
|
1561 Unfortunately, this can't be done here because delete_process doesn't know
|
|
|
1562 about the kind of connection we have. However, this is not such an
|
|
|
1563 important issue.
|
|
|
1564 */
|
|
|
1565
|
|
|
1566 static void
|
|
|
1567 unix_open_multicast_group (Lisp_Object name, Lisp_Object dest, Lisp_Object port,
|
|
|
1568 Lisp_Object ttl, void** vinfd, void** voutfd)
|
|
|
1569 {
|
|
|
1570 struct ip_mreq imr;
|
|
|
1571 struct sockaddr_in sa;
|
|
|
1572 struct protoent *udp;
|
|
|
1573 int ws, rs;
|
|
|
1574 int theport;
|
|
|
1575 unsigned char thettl;
|
|
|
1576 int one = 1; /* For REUSEADDR */
|
|
|
1577 int ret;
|
|
|
1578 volatile int retry = 0;
|
|
|
1579
|
|
|
1580 CHECK_STRING (dest);
|
|
272
|
1581
|
|
263
|
1582 CHECK_NATNUM (port);
|
|
|
1583 theport = htons ((unsigned short) XINT (port));
|
|
272
|
1584
|
|
263
|
1585 CHECK_NATNUM (ttl);
|
|
|
1586 thettl = (unsigned char) XINT (ttl);
|
|
272
|
1587
|
|
263
|
1588 if ((udp = getprotobyname ("udp")) == NULL)
|
|
|
1589 error ("No info available for UDP protocol");
|
|
272
|
1590
|
|
263
|
1591 /* Init the sockets. Yes, I need 2 sockets. I couldn't duplicate one. */
|
|
|
1592 if ((rs = socket (PF_INET, SOCK_DGRAM, udp->p_proto)) < 0)
|
|
|
1593 report_file_error ("error creating socket", list1(name));
|
|
|
1594 if ((ws = socket (PF_INET, SOCK_DGRAM, udp->p_proto)) < 0)
|
|
|
1595 {
|
|
|
1596 close (rs);
|
|
|
1597 report_file_error ("error creating socket", list1(name));
|
|
|
1598 }
|
|
272
|
1599
|
|
263
|
1600 /* This will be used for both sockets */
|
|
282
|
1601 memset (&sa, 0, sizeof(sa));
|
|
272
|
1602 sa.sin_family = AF_INET;
|
|
263
|
1603 sa.sin_port = theport;
|
|
|
1604 sa.sin_addr.s_addr = htonl (inet_addr ((char *) XSTRING_DATA (dest)));
|
|
|
1605
|
|
|
1606 /* Socket configuration for reading ------------------------ */
|
|
272
|
1607
|
|
263
|
1608 /* Multiple connections from the same machine. This must be done before
|
|
|
1609 bind. If it fails, it shouldn't be fatal. The only consequence is that
|
|
|
1610 people won't be able to connect twice from the same machine. */
|
|
|
1611 if (setsockopt (rs, SOL_SOCKET, SO_REUSEADDR, (char *) &one, sizeof (one))
|
|
|
1612 < 0)
|
|
|
1613 warn_when_safe (Qmulticast, Qwarning, "Cannot reuse socket address");
|
|
272
|
1614
|
|
263
|
1615 /* bind socket name */
|
|
|
1616 if (bind (rs, (struct sockaddr *)&sa, sizeof(sa)))
|
|
|
1617 {
|
|
|
1618 close (rs);
|
|
|
1619 close (ws);
|
|
|
1620 report_file_error ("error binding socket", list2(name, port));
|
|
|
1621 }
|
|
272
|
1622
|
|
263
|
1623 /* join multicast group */
|
|
|
1624 imr.imr_multiaddr.s_addr = htonl (inet_addr ((char *) XSTRING_DATA (dest)));
|
|
|
1625 imr.imr_interface.s_addr = htonl (INADDR_ANY);
|
|
|
1626 if (setsockopt (rs, IPPROTO_IP, IP_ADD_MEMBERSHIP,
|
|
|
1627 (char *) &imr, sizeof (struct ip_mreq)) < 0)
|
|
|
1628 {
|
|
|
1629 close (ws);
|
|
|
1630 close (rs);
|
|
|
1631 report_file_error ("error adding membership", list2(name, dest));
|
|
|
1632 }
|
|
272
|
1633
|
|
263
|
1634 /* Socket configuration for writing ----------------------- */
|
|
272
|
1635
|
|
380
|
1636 /* Normally, there's no 'connect' in multicast, since we prefer to use
|
|
263
|
1637 'sendto' and 'recvfrom'. However, in order to handle this connection in
|
|
|
1638 the process-like way it is done for TCP, we must be able to use 'write'
|
|
|
1639 instead of 'sendto'. Consequently, we 'connect' this socket. */
|
|
272
|
1640
|
|
263
|
1641 /* See open-network-stream-internal for comments on this part of the code */
|
|
|
1642 slow_down_interrupts ();
|
|
272
|
1643
|
|
263
|
1644 loop:
|
|
272
|
1645
|
|
263
|
1646 /* A system call interrupted with a SIGALRM or SIGIO comes back
|
|
|
1647 here, with can_break_system_calls reset to 0. */
|
|
|
1648 SETJMP (break_system_call_jump);
|
|
|
1649 if (QUITP)
|
|
|
1650 {
|
|
|
1651 speed_up_interrupts ();
|
|
|
1652 REALLY_QUIT;
|
|
|
1653 /* In case something really weird happens ... */
|
|
|
1654 slow_down_interrupts ();
|
|
|
1655 }
|
|
272
|
1656
|
|
263
|
1657 /* Break out of connect with a signal (it isn't otherwise possible).
|
|
|
1658 Thus you don't get screwed with a hung network. */
|
|
|
1659 can_break_system_calls = 1;
|
|
|
1660 ret = connect (ws, (struct sockaddr *) &sa, sizeof (sa));
|
|
|
1661 can_break_system_calls = 0;
|
|
|
1662 if (ret == -1 && errno != EISCONN)
|
|
|
1663 {
|
|
|
1664 int xerrno = errno;
|
|
272
|
1665
|
|
263
|
1666 if (errno == EINTR)
|
|
|
1667 goto loop;
|
|
|
1668 if (errno == EADDRINUSE && retry < 20)
|
|
272
|
1669 {
|
|
263
|
1670 /* A delay here is needed on some FreeBSD systems,
|
|
|
1671 and it is harmless, since this retrying takes time anyway
|
|
|
1672 and should be infrequent.
|
|
|
1673 `sleep-for' allowed for quitting this loop with interrupts
|
|
|
1674 slowed down so it can't be used here. Async timers should
|
|
|
1675 already be disabled at this point so we can use `sleep'. */
|
|
|
1676 sleep (1);
|
|
|
1677 retry++;
|
|
|
1678 goto loop;
|
|
|
1679 }
|
|
272
|
1680
|
|
263
|
1681 close (rs);
|
|
|
1682 close (ws);
|
|
|
1683 speed_up_interrupts ();
|
|
272
|
1684
|
|
263
|
1685 errno = xerrno;
|
|
|
1686 report_file_error ("error connecting socket", list2(name, port));
|
|
|
1687 }
|
|
272
|
1688
|
|
263
|
1689 speed_up_interrupts ();
|
|
272
|
1690
|
|
263
|
1691 /* scope */
|
|
272
|
1692 if (setsockopt (ws, IPPROTO_IP, IP_MULTICAST_TTL,
|
|
263
|
1693 (char *) &thettl, sizeof (thettl)) < 0)
|
|
|
1694 {
|
|
|
1695 close (rs);
|
|
|
1696 close (ws);
|
|
|
1697 report_file_error ("error setting ttl", list2(name, ttl));
|
|
|
1698 }
|
|
272
|
1699
|
|
263
|
1700 set_socket_nonblocking_maybe (rs, theport, "udp");
|
|
|
1701
|
|
|
1702 *vinfd = (void*)rs;
|
|
|
1703 *voutfd = (void*)ws;
|
|
|
1704 }
|
|
|
1705
|
|
|
1706 #endif /* HAVE_MULTICAST */
|
|
|
1707
|
|
|
1708 #endif /* HAVE_SOCKETS */
|
|
|
1709
|
|
|
1710
|
|
|
1711 /**********************************************************************/
|
|
|
1712 /* Initialization */
|
|
|
1713 /**********************************************************************/
|
|
|
1714
|
|
|
1715 void
|
|
|
1716 process_type_create_unix (void)
|
|
|
1717 {
|
|
|
1718 PROCESS_HAS_METHOD (unix, alloc_process_data);
|
|
|
1719 PROCESS_HAS_METHOD (unix, mark_process_data);
|
|
|
1720 #ifdef SIGCHLD
|
|
|
1721 PROCESS_HAS_METHOD (unix, init_process);
|
|
|
1722 PROCESS_HAS_METHOD (unix, reap_exited_processes);
|
|
|
1723 #endif
|
|
|
1724 PROCESS_HAS_METHOD (unix, init_process_io_handles);
|
|
|
1725 PROCESS_HAS_METHOD (unix, create_process);
|
|
|
1726 PROCESS_HAS_METHOD (unix, tooltalk_connection_p);
|
|
|
1727 PROCESS_HAS_METHOD (unix, set_window_size);
|
|
|
1728 #ifdef HAVE_WAITPID
|
|
|
1729 PROCESS_HAS_METHOD (unix, update_status_if_terminated);
|
|
|
1730 #endif
|
|
|
1731 PROCESS_HAS_METHOD (unix, send_process);
|
|
|
1732 PROCESS_HAS_METHOD (unix, process_send_eof);
|
|
|
1733 PROCESS_HAS_METHOD (unix, deactivate_process);
|
|
|
1734 PROCESS_HAS_METHOD (unix, kill_child_process);
|
|
|
1735 PROCESS_HAS_METHOD (unix, kill_process_by_pid);
|
|
|
1736 PROCESS_HAS_METHOD (unix, get_tty_name);
|
|
|
1737 #ifdef HAVE_SOCKETS
|
|
|
1738 PROCESS_HAS_METHOD (unix, canonicalize_host_name);
|
|
|
1739 PROCESS_HAS_METHOD (unix, open_network_stream);
|
|
|
1740 #ifdef HAVE_MULTICAST
|
|
|
1741 PROCESS_HAS_METHOD (unix, open_multicast_group);
|
|
|
1742 #endif
|
|
|
1743 #endif
|
|
|
1744 }
|
|
|
1745
|
|
|
1746 void
|
|
|
1747 vars_of_process_unix (void)
|
|
|
1748 {
|
|
|
1749 Fprovide (intern ("unix-processes"));
|
|
|
1750 }
|
|
|
1751
|
|
|
1752 #endif /* !defined (NO_SUBPROCESSES) */
|
