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428
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1 /* Asynchronous subprocess implementation for UNIX
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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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63 * Implementation-specific data. Pointed to by Lisp_Process->process_data
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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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205 #ifndef PTY_OPEN
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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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214 #endif
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215 int fd;
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216 #ifndef HAVE_GETPT
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217 int i;
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218 int c;
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219 #endif
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220
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221 #ifdef PTY_ITERATION
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222 PTY_ITERATION
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223 #else
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224 for (c = FIRST_PTY_LETTER; c <= 'z'; c++)
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225 for (i = 0; i < 16; i++)
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226 #endif
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227 {
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228 #ifdef PTY_NAME_SPRINTF
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229 PTY_NAME_SPRINTF
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230 #else
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231 sprintf (pty_name, "/dev/pty%c%x", c, i);
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232 #endif /* no PTY_NAME_SPRINTF */
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233
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234 #ifdef PTY_OPEN
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235 PTY_OPEN;
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236 #else /* no PTY_OPEN */
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237 #ifdef IRIS
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238 /* Unusual IRIS code */
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239 *ptyv = open ("/dev/ptc", O_RDWR | O_NONBLOCK | OPEN_BINARY, 0);
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240 if (fd < 0)
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241 return -1;
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242 if (fstat (fd, &stb) < 0)
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243 return -1;
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244 #else /* not IRIS */
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245 if (stat (pty_name, &stb) < 0)
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246 {
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247 failed_count++;
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248 if (failed_count >= 3)
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249 return -1;
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250 }
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251 else
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252 failed_count = 0;
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253 fd = open (pty_name, O_RDWR | O_NONBLOCK | OPEN_BINARY, 0);
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254 #endif /* not IRIS */
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255 #endif /* no PTY_OPEN */
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256
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257 if (fd >= 0)
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258 {
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259 /* check to make certain that both sides are available
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260 this avoids a nasty yet stupid bug in rlogins */
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261 #ifdef PTY_TTY_NAME_SPRINTF
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262 PTY_TTY_NAME_SPRINTF
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263 #else
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264 sprintf (pty_name, "/dev/tty%c%x", c, i);
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265 #endif /* no PTY_TTY_NAME_SPRINTF */
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266 #if !defined(UNIPLUS) && !defined(HAVE_GETPT)
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267 if (access (pty_name, 6) != 0)
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268 {
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269 close (fd);
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270 #if !defined(IRIS) && !defined(__sgi)
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271 continue;
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272 #else
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273 return -1;
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274 #endif /* IRIS */
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275 }
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276 #endif /* not UNIPLUS */
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277 setup_pty (fd);
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278 return fd;
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279 }
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280 }
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281 return -1;
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282 }
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283 #endif /* HAVE_PTYS */
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284
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285 static int
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286 create_bidirectional_pipe (int *inchannel, int *outchannel,
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287 volatile int *forkin, volatile int *forkout)
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288 {
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289 int sv[2];
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290
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291 #ifdef SKTPAIR
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292 if (socketpair (AF_UNIX, SOCK_STREAM, 0, sv) < 0)
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293 return -1;
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294 *outchannel = *inchannel = sv[0];
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295 *forkout = *forkin = sv[1];
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296 #else /* not SKTPAIR */
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297 int temp;
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298 temp = pipe (sv);
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299 if (temp < 0) return -1;
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300 *inchannel = sv[0];
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301 *forkout = sv[1];
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302 temp = pipe (sv);
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303 if (temp < 0) return -1;
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304 *outchannel = sv[1];
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305 *forkin = sv[0];
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306 #endif /* not SKTPAIR */
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307 return 0;
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308 }
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309
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310
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311 #ifdef HAVE_SOCKETS
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312
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313 static int
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314 get_internet_address (Lisp_Object host, struct sockaddr_in *address,
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315 Error_behavior errb)
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316 {
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317 struct hostent *host_info_ptr = NULL;
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318 #ifdef TRY_AGAIN
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319 int count = 0;
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320 #endif
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321
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322 xzero (*address);
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323
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324 while (1)
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325 {
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326 #ifdef TRY_AGAIN
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327 if (count++ > 10) break;
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328 #ifndef BROKEN_CYGWIN
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329 h_errno = 0;
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330 #endif
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331 #endif
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332 /* Some systems can't handle SIGIO/SIGALARM in gethostbyname. */
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333 slow_down_interrupts ();
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334 host_info_ptr = gethostbyname ((char *) XSTRING_DATA (host));
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335 speed_up_interrupts ();
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336 #ifdef TRY_AGAIN
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337 if (! (host_info_ptr == 0 && h_errno == TRY_AGAIN))
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338 #endif
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339 break;
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340 Fsleep_for (make_int (1));
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341 }
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342 if (host_info_ptr)
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343 {
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344 address->sin_family = host_info_ptr->h_addrtype;
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345 memcpy (&address->sin_addr, host_info_ptr->h_addr, host_info_ptr->h_length);
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346 }
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347 else
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348 {
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349 IN_ADDR numeric_addr;
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350 /* Attempt to interpret host as numeric inet address */
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351 numeric_addr = inet_addr ((char *) XSTRING_DATA (host));
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352 if (NUMERIC_ADDR_ERROR)
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353 {
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354 maybe_error (Qprocess, errb,
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355 "Unknown host \"%s\"", XSTRING_DATA (host));
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356 return 0;
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|
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357 }
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358
|
|
|
359 /* There was some broken code here that called strlen() here
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360 on (char *) &numeric_addr and even sometimes accessed
|
|
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361 uninitialized data. */
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362 address->sin_family = AF_INET;
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|
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363 * (IN_ADDR *) &address->sin_addr = numeric_addr;
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|
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364 }
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365
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366 return 1;
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|
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367 }
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368
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|
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369 static void
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370 set_socket_nonblocking_maybe (int fd, int port, CONST char* proto)
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|
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371 {
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|
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372 #ifdef PROCESS_IO_BLOCKING
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373 Lisp_Object tail;
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374
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|
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375 for (tail = network_stream_blocking_port_list; CONSP (tail); tail = XCDR (tail))
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|
|
376 {
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377 Lisp_Object tail_port = XCAR (tail);
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378
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|
|
379 if (STRINGP (tail_port))
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|
|
380 {
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|
|
381 struct servent *svc_info;
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|
|
382 CHECK_STRING (tail_port);
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|
|
383 svc_info = getservbyname ((char *) XSTRING_DATA (tail_port), proto);
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|
|
384 if ((svc_info != 0) && (svc_info->s_port == port))
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|
|
385 break;
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|
|
386 else
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|
|
387 continue;
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|
|
388 }
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|
|
389 else if (INTP (tail_port) && (htons ((unsigned short) XINT (tail_port)) == port))
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|
|
390 break;
|
|
|
391 }
|
|
|
392
|
|
|
393 if (!CONSP (tail))
|
|
|
394 {
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|
|
395 set_descriptor_non_blocking (fd);
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|
|
396 }
|
|
|
397 #else
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|
|
398 set_descriptor_non_blocking (fd);
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|
|
399 #endif /* PROCESS_IO_BLOCKING */
|
|
|
400 }
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|
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401
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|
|
402 #endif /* HAVE_SOCKETS */
|
|
|
403
|
|
|
404 /* Compute the Lisp form of the process status from
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|
|
405 the numeric status that was returned by `wait'. */
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|
|
406
|
|
|
407 static void
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|
|
408 update_status_from_wait_code (struct Lisp_Process *p, int *w_fmh)
|
|
|
409 {
|
|
|
410 /* C compiler lossage when attempting to pass w directly */
|
|
|
411 int w = *w_fmh;
|
|
|
412
|
|
|
413 if (WIFSTOPPED (w))
|
|
|
414 {
|
|
|
415 p->status_symbol = Qstop;
|
|
|
416 p->exit_code = WSTOPSIG (w);
|
|
|
417 p->core_dumped = 0;
|
|
|
418 }
|
|
|
419 else if (WIFEXITED (w))
|
|
|
420 {
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|
|
421 p->status_symbol = Qexit;
|
|
|
422 p->exit_code = WEXITSTATUS (w);
|
|
|
423 p->core_dumped = 0;
|
|
|
424 }
|
|
|
425 else if (WIFSIGNALED (w))
|
|
|
426 {
|
|
|
427 p->status_symbol = Qsignal;
|
|
|
428 p->exit_code = WTERMSIG (w);
|
|
|
429 p->core_dumped = WCOREDUMP (w);
|
|
|
430 }
|
|
|
431 else
|
|
|
432 {
|
|
|
433 p->status_symbol = Qrun;
|
|
|
434 p->exit_code = 0;
|
|
|
435 }
|
|
|
436 }
|
|
|
437
|
|
|
438 #ifdef SIGCHLD
|
|
|
439
|
|
|
440 #define MAX_EXITED_PROCESSES 1000
|
|
|
441 static volatile pid_t exited_processes[MAX_EXITED_PROCESSES];
|
|
|
442 static volatile int exited_processes_status[MAX_EXITED_PROCESSES];
|
|
|
443 static volatile int exited_processes_index;
|
|
|
444
|
|
|
445 static volatile int sigchld_happened;
|
|
|
446
|
|
|
447 /* On receipt of a signal that a child status has changed,
|
|
|
448 loop asking about children with changed statuses until
|
|
|
449 the system says there are no more. All we do is record
|
|
|
450 the processes and wait status.
|
|
|
451
|
|
|
452 This function could be called from within the SIGCHLD
|
|
|
453 handler, so it must be completely reentrant. When
|
|
|
454 not called from a SIGCHLD handler, BLOCK_SIGCHLD should
|
|
|
455 be non-zero so that SIGCHLD is blocked while this
|
|
|
456 function is running. (This is necessary so avoid
|
|
|
457 race conditions with the SIGCHLD_HAPPENED flag). */
|
|
|
458
|
|
|
459 static void
|
|
|
460 record_exited_processes (int block_sigchld)
|
|
|
461 {
|
|
|
462 if (!sigchld_happened)
|
|
|
463 {
|
|
|
464 return;
|
|
|
465 }
|
|
|
466
|
|
|
467 #ifdef EMACS_BLOCK_SIGNAL
|
|
|
468 if (block_sigchld)
|
|
|
469 EMACS_BLOCK_SIGNAL (SIGCHLD);
|
|
|
470 #endif
|
|
|
471
|
|
|
472 while (sigchld_happened)
|
|
|
473 {
|
|
|
474 int pid;
|
|
|
475 int w;
|
|
|
476
|
|
|
477 /* Keep trying to get a status until we get a definitive result. */
|
|
|
478 do
|
|
|
479 {
|
|
|
480 errno = 0;
|
|
|
481 #ifdef WNOHANG
|
|
|
482 # ifndef WUNTRACED
|
|
|
483 # define WUNTRACED 0
|
|
|
484 # endif /* not WUNTRACED */
|
|
|
485 # ifdef HAVE_WAITPID
|
|
|
486 pid = waitpid ((pid_t) -1, &w, WNOHANG | WUNTRACED);
|
|
|
487 # else
|
|
|
488 pid = wait3 (&w, WNOHANG | WUNTRACED, 0);
|
|
|
489 # endif
|
|
|
490 #else /* not WNOHANG */
|
|
|
491 pid = wait (&w);
|
|
|
492 #endif /* not WNOHANG */
|
|
|
493 }
|
|
|
494 while (pid <= 0 && errno == EINTR);
|
|
|
495
|
|
|
496 if (pid <= 0)
|
|
|
497 break;
|
|
|
498
|
|
|
499 if (exited_processes_index < MAX_EXITED_PROCESSES)
|
|
|
500 {
|
|
|
501 exited_processes[exited_processes_index] = pid;
|
|
|
502 exited_processes_status[exited_processes_index] = w;
|
|
|
503 exited_processes_index++;
|
|
|
504 }
|
|
|
505
|
|
|
506 /* On systems with WNOHANG, we just ignore the number
|
|
|
507 of times that SIGCHLD was signalled, and keep looping
|
|
|
508 until there are no more processes to wait on. If we
|
|
|
509 don't have WNOHANG, we have to rely on the count in
|
|
|
510 SIGCHLD_HAPPENED. */
|
|
|
511 #ifndef WNOHANG
|
|
|
512 sigchld_happened--;
|
|
|
513 #endif /* not WNOHANG */
|
|
|
514 }
|
|
|
515
|
|
|
516 sigchld_happened = 0;
|
|
|
517
|
|
|
518 if (block_sigchld)
|
|
|
519 EMACS_UNBLOCK_SIGNAL (SIGCHLD);
|
|
|
520 }
|
|
|
521
|
|
|
522 /* For any processes that have changed status and are recorded
|
|
|
523 and such, update the corresponding struct Lisp_Process.
|
|
|
524 We separate this from record_exited_processes() so that
|
|
|
525 we never have to call this function from within a signal
|
|
|
526 handler. We block SIGCHLD in case record_exited_processes()
|
|
|
527 is called from a signal handler. */
|
|
|
528
|
|
|
529 /** USG WARNING: Although it is not obvious from the documentation
|
|
|
530 in signal(2), on a USG system the SIGCLD handler MUST NOT call
|
|
|
531 signal() before executing at least one wait(), otherwise the handler
|
|
|
532 will be called again, resulting in an infinite loop. The relevant
|
|
|
533 portion of the documentation reads "SIGCLD signals will be queued
|
|
|
534 and the signal-catching function will be continually reentered until
|
|
|
535 the queue is empty". Invoking signal() causes the kernel to reexamine
|
|
|
536 the SIGCLD queue. Fred Fish, UniSoft Systems Inc.
|
|
|
537
|
|
|
538 (Note that now this only applies in SYS V Release 2 and before.
|
|
|
539 On SYS V Release 3, we use sigset() to set the signal handler for
|
|
|
540 the first time, and so we don't have to reestablish the signal handler
|
|
|
541 in the handler below. On SYS V Release 4, we don't get this weirdo
|
|
|
542 behavior when we use sigaction(), which we do use.) */
|
|
|
543
|
|
|
544 static SIGTYPE
|
|
|
545 sigchld_handler (int signo)
|
|
|
546 {
|
|
|
547 #ifdef OBNOXIOUS_SYSV_SIGCLD_BEHAVIOR
|
|
|
548 int old_errno = errno;
|
|
|
549
|
|
|
550 sigchld_happened++;
|
|
|
551 record_exited_processes (0);
|
|
|
552 errno = old_errno;
|
|
|
553 #else
|
|
|
554 sigchld_happened++;
|
|
|
555 #endif
|
|
|
556 #ifdef HAVE_UNIXOID_EVENT_LOOP
|
|
|
557 signal_fake_event ();
|
|
|
558 #endif
|
|
|
559 /* WARNING - must come after wait3() for USG systems */
|
|
|
560 EMACS_REESTABLISH_SIGNAL (signo, sigchld_handler);
|
|
|
561 SIGRETURN;
|
|
|
562 }
|
|
|
563
|
|
|
564 #endif /* SIGCHLD */
|
|
|
565
|
|
|
566 #ifdef SIGNALS_VIA_CHARACTERS
|
|
|
567 /* Get signal character to send to process if SIGNALS_VIA_CHARACTERS */
|
|
|
568
|
|
|
569 static int
|
|
|
570 process_signal_char (int tty_fd, int signo)
|
|
|
571 {
|
|
|
572 /* If it's not a tty, pray that these default values work */
|
|
|
573 if (!isatty(tty_fd)) {
|
|
|
574 #define CNTL(ch) (037 & (ch))
|
|
|
575 switch (signo)
|
|
|
576 {
|
|
|
577 case SIGINT: return CNTL('C');
|
|
|
578 case SIGQUIT: return CNTL('\\');
|
|
|
579 #ifdef SIGTSTP
|
|
|
580 case SIGTSTP: return CNTL('Z');
|
|
|
581 #endif
|
|
|
582 }
|
|
|
583 }
|
|
|
584
|
|
|
585 #ifdef HAVE_TERMIOS
|
|
|
586 /* TERMIOS is the latest and bestest, and seems most likely to work.
|
|
|
587 If the system has it, use it. */
|
|
|
588 {
|
|
|
589 struct termios t;
|
|
|
590 tcgetattr (tty_fd, &t);
|
|
|
591 switch (signo)
|
|
|
592 {
|
|
|
593 case SIGINT: return t.c_cc[VINTR];
|
|
|
594 case SIGQUIT: return t.c_cc[VQUIT];
|
|
|
595 #if defined(SIGTSTP) && defined(VSUSP)
|
|
|
596 case SIGTSTP: return t.c_cc[VSUSP];
|
|
|
597 #endif
|
|
|
598 }
|
|
|
599 }
|
|
|
600
|
|
|
601 # elif defined (TIOCGLTC) && defined (TIOCGETC) /* not HAVE_TERMIOS */
|
|
|
602 {
|
|
|
603 /* On Berkeley descendants, the following IOCTL's retrieve the
|
|
|
604 current control characters. */
|
|
|
605 struct tchars c;
|
|
|
606 struct ltchars lc;
|
|
|
607 switch (signo)
|
|
|
608 {
|
|
|
609 case SIGINT: ioctl (tty_fd, TIOCGETC, &c); return c.t_intrc;
|
|
|
610 case SIGQUIT: ioctl (tty_fd, TIOCGETC, &c); return c.t_quitc;
|
|
|
611 # ifdef SIGTSTP
|
|
|
612 case SIGTSTP: ioctl (tty_fd, TIOCGLTC, &lc); return lc.t_suspc;
|
|
|
613 # endif /* SIGTSTP */
|
|
|
614 }
|
|
|
615 }
|
|
|
616
|
|
|
617 # elif defined (TCGETA) /* ! defined (TIOCGLTC) && defined (TIOCGETC) */
|
|
|
618 {
|
|
|
619 /* On SYSV descendants, the TCGETA ioctl retrieves the current
|
|
|
620 control characters. */
|
|
|
621 struct termio t;
|
|
|
622 ioctl (tty_fd, TCGETA, &t);
|
|
|
623 switch (signo) {
|
|
|
624 case SIGINT: return t.c_cc[VINTR];
|
|
|
625 case SIGQUIT: return t.c_cc[VQUIT];
|
|
|
626 # ifdef SIGTSTP
|
|
|
627 case SIGTSTP: return t.c_cc[VSWTCH];
|
|
|
628 # endif /* SIGTSTP */
|
|
|
629 }
|
|
|
630 }
|
|
|
631 # else /* ! defined (TCGETA) */
|
|
|
632 #error ERROR! Using SIGNALS_VIA_CHARACTERS, but not HAVE_TERMIOS || (TIOCGLTC && TIOCGETC) || TCGETA
|
|
|
633 /* If your system configuration files define SIGNALS_VIA_CHARACTERS,
|
|
|
634 you'd better be using one of the alternatives above! */
|
|
|
635 # endif /* ! defined (TCGETA) */
|
|
|
636 return '\0';
|
|
|
637 }
|
|
|
638 #endif /* SIGNALS_VIA_CHARACTERS */
|
|
|
639
|
|
|
640
|
|
|
641
|
|
|
642
|
|
|
643 /**********************************************************************/
|
|
|
644 /* Process implementation methods */
|
|
|
645 /**********************************************************************/
|
|
|
646
|
|
|
647 /*
|
|
|
648 * Allocate and initialize Lisp_Process->process_data
|
|
|
649 */
|
|
|
650
|
|
|
651 static void
|
|
|
652 unix_alloc_process_data (struct Lisp_Process *p)
|
|
|
653 {
|
|
|
654 p->process_data = xnew (struct unix_process_data);
|
|
|
655
|
|
|
656 UNIX_DATA(p)->connected_via_filedesc_p = 0;
|
|
|
657 UNIX_DATA(p)->infd = -1;
|
|
|
658 UNIX_DATA(p)->subtty = -1;
|
|
|
659 UNIX_DATA(p)->tty_name = Qnil;
|
|
|
660 UNIX_DATA(p)->pty_flag = 0;
|
|
|
661 }
|
|
|
662
|
|
|
663 /*
|
|
|
664 * Mark any Lisp objects in Lisp_Process->process_data
|
|
|
665 */
|
|
|
666
|
|
|
667 static void
|
|
|
668 unix_mark_process_data (struct Lisp_Process *proc)
|
|
|
669 {
|
|
|
670 mark_object (UNIX_DATA(proc)->tty_name);
|
|
|
671 }
|
|
|
672
|
|
|
673 /*
|
|
|
674 * Initialize XEmacs process implementation once
|
|
|
675 */
|
|
|
676
|
|
|
677 #ifdef SIGCHLD
|
|
|
678 static void
|
|
|
679 unix_init_process (void)
|
|
|
680 {
|
|
|
681 #ifndef CANNOT_DUMP
|
|
|
682 if (! noninteractive || initialized)
|
|
|
683 #endif
|
|
|
684 signal (SIGCHLD, sigchld_handler);
|
|
|
685 }
|
|
|
686 #endif /* SIGCHLD */
|
|
|
687
|
|
|
688 /*
|
|
|
689 * Initialize any process local data. This is called when newly
|
|
|
690 * created process is connected to real OS file handles. The
|
|
|
691 * handles are generally represented by void* type, but are
|
|
|
692 * of type int (file descriptors) for UNIX
|
|
|
693 */
|
|
|
694
|
|
|
695 static void
|
|
|
696 unix_init_process_io_handles (struct Lisp_Process *p, void* in, void* out, int flags)
|
|
|
697 {
|
|
|
698 UNIX_DATA(p)->infd = (int)in;
|
|
|
699 }
|
|
|
700
|
|
|
701 /*
|
|
|
702 * Fork off a subprocess. P is a pointer to a newly created subprocess
|
|
|
703 * object. If this function signals, the caller is responsible for
|
|
|
704 * deleting (and finalizing) the process object.
|
|
|
705 *
|
|
|
706 * The method must return PID of the new process, a (positive??? ####) number
|
|
|
707 * which fits into Lisp_Int. No return value indicates an error, the method
|
|
|
708 * must signal an error instead.
|
|
|
709 */
|
|
|
710
|
|
|
711 static int
|
|
|
712 unix_create_process (struct Lisp_Process *p,
|
|
|
713 Lisp_Object *argv, int nargv,
|
|
|
714 Lisp_Object program, Lisp_Object cur_dir)
|
|
|
715 {
|
|
|
716 /* This function rewritten by ben@xemacs.org. */
|
|
|
717
|
|
|
718 int pid;
|
|
|
719 int inchannel = -1;
|
|
|
720 int outchannel = -1;
|
|
|
721 /* Use volatile to protect variables from being clobbered by longjmp. */
|
|
|
722 volatile int forkin = -1;
|
|
|
723 volatile int forkout = -1;
|
|
|
724 volatile int pty_flag = 0;
|
|
|
725
|
|
|
726 #ifdef HAVE_PTYS
|
|
|
727 if (!NILP (Vprocess_connection_type))
|
|
|
728 {
|
|
|
729 /* find a new pty, open the master side, return the opened
|
|
|
730 file handle, and store the name of the corresponding slave
|
|
|
731 side in global variable pty_name. */
|
|
|
732 outchannel = inchannel = allocate_pty ();
|
|
|
733 }
|
|
|
734
|
|
|
735 if (inchannel >= 0)
|
|
|
736 {
|
|
|
737 /* You're "supposed" to now open the slave in the child.
|
|
|
738 On some systems, we can open it here; this allows for
|
|
|
739 better error checking. */
|
|
|
740 #if !defined(USG)
|
|
|
741 /* On USG systems it does not work to open the pty's tty here
|
|
|
742 and then close and reopen it in the child. */
|
|
|
743 #ifdef O_NOCTTY
|
|
|
744 /* Don't let this terminal become our controlling terminal
|
|
|
745 (in case we don't have one). */
|
|
|
746 forkout = forkin = open (pty_name, O_RDWR | O_NOCTTY | OPEN_BINARY, 0);
|
|
|
747 #else
|
|
|
748 forkout = forkin = open (pty_name, O_RDWR | OPEN_BINARY, 0);
|
|
|
749 #endif
|
|
|
750 if (forkin < 0)
|
|
|
751 goto io_failure;
|
|
|
752 #endif /* not USG */
|
|
|
753 UNIX_DATA(p)->pty_flag = pty_flag = 1;
|
|
|
754 }
|
|
|
755 else
|
|
|
756 #endif /* HAVE_PTYS */
|
|
|
757 if (create_bidirectional_pipe (&inchannel, &outchannel,
|
|
|
758 &forkin, &forkout) < 0)
|
|
|
759 goto io_failure;
|
|
|
760
|
|
|
761 #if 0
|
|
|
762 /* Replaced by close_process_descs */
|
|
|
763 set_exclusive_use (inchannel);
|
|
|
764 set_exclusive_use (outchannel);
|
|
|
765 #endif
|
|
|
766
|
|
|
767 set_descriptor_non_blocking (inchannel);
|
|
|
768
|
|
|
769 /* Record this as an active process, with its channels.
|
|
|
770 As a result, child_setup will close Emacs's side of the pipes. */
|
|
|
771 init_process_io_handles (p, (void*)inchannel, (void*)outchannel,
|
|
|
772 pty_flag ? STREAM_PTY_FLUSHING : 0);
|
|
|
773 /* Record the tty descriptor used in the subprocess. */
|
|
|
774 UNIX_DATA(p)->subtty = forkin;
|
|
|
775
|
|
|
776 {
|
|
|
777 #if !defined(__CYGWIN32__)
|
|
|
778 /* child_setup must clobber environ on systems with true vfork.
|
|
|
779 Protect it from permanent change. */
|
|
|
780 char **save_environ = environ;
|
|
|
781 #endif
|
|
|
782
|
|
|
783 pid = fork ();
|
|
|
784 if (pid == 0)
|
|
|
785 {
|
|
|
786 /**** Now we're in the child process ****/
|
|
|
787 int xforkin = forkin;
|
|
|
788 int xforkout = forkout;
|
|
|
789
|
|
|
790 if (!pty_flag)
|
|
|
791 EMACS_SEPARATE_PROCESS_GROUP ();
|
|
|
792 #ifdef HAVE_PTYS
|
|
|
793 else
|
|
|
794 {
|
|
|
795 /* Disconnect the current controlling terminal, pursuant to
|
|
|
796 making the pty be the controlling terminal of the process.
|
|
|
797 Also put us in our own process group. */
|
|
|
798
|
|
|
799 disconnect_controlling_terminal ();
|
|
|
800
|
|
|
801 /* Open the pty connection and make the pty's terminal
|
|
|
802 our controlling terminal.
|
|
|
803
|
|
|
804 On systems with TIOCSCTTY, we just use it to set
|
|
|
805 the controlling terminal. On other systems, the
|
|
|
806 first TTY we open becomes the controlling terminal.
|
|
|
807 So, we end up with four possibilities:
|
|
|
808
|
|
|
809 (1) on USG and TIOCSCTTY systems, we open the pty
|
|
|
810 and use TIOCSCTTY.
|
|
|
811 (2) on other USG systems, we just open the pty.
|
|
|
812 (3) on non-USG systems with TIOCSCTTY, we
|
|
|
813 just use TIOCSCTTY. (On non-USG systems, we
|
|
|
814 already opened the pty in the parent process.)
|
|
|
815 (4) on non-USG systems without TIOCSCTTY, we
|
|
|
816 close the pty and reopen it.
|
|
|
817
|
|
|
818 This would be cleaner if we didn't open the pty
|
|
|
819 in the parent process, but doing it that way
|
|
|
820 makes it possible to trap error conditions.
|
|
|
821 It's harder to convey an error from the child
|
|
|
822 process, and I don't feel like messing with
|
|
|
823 this now. */
|
|
|
824
|
|
|
825 /* There was some weirdo, probably wrong,
|
|
|
826 conditionalization on RTU and UNIPLUS here.
|
|
|
827 I deleted it. So sue me. */
|
|
|
828
|
|
|
829 /* SunOS has TIOCSCTTY but the close/open method
|
|
|
830 also works. */
|
|
|
831
|
|
|
832 # if defined (USG) || !defined (TIOCSCTTY)
|
|
|
833 /* Now close the pty (if we had it open) and reopen it.
|
|
|
834 This makes the pty the controlling terminal of the
|
|
|
835 subprocess. */
|
|
|
836 /* I wonder if close (open (pty_name, ...)) would work? */
|
|
|
837 if (xforkin >= 0)
|
|
|
838 close (xforkin);
|
|
|
839 xforkout = xforkin = open (pty_name, O_RDWR | OPEN_BINARY, 0);
|
|
|
840 if (xforkin < 0)
|
|
|
841 {
|
|
|
842 write (1, "Couldn't open the pty terminal ", 31);
|
|
|
843 write (1, pty_name, strlen (pty_name));
|
|
|
844 write (1, "\n", 1);
|
|
|
845 _exit (1);
|
|
|
846 }
|
|
|
847 # endif /* USG or not TIOCSCTTY */
|
|
|
848
|
|
|
849 /* Miscellaneous setup required for some systems.
|
|
|
850 Must be done before using tc* functions on xforkin.
|
|
|
851 This guarantees that isatty(xforkin) is true. */
|
|
|
852
|
|
|
853 # ifdef SETUP_SLAVE_PTY
|
|
|
854 SETUP_SLAVE_PTY;
|
|
|
855 # endif /* SETUP_SLAVE_PTY */
|
|
|
856
|
|
|
857 # ifdef TIOCSCTTY
|
|
|
858 /* We ignore the return value
|
|
|
859 because faith@cs.unc.edu says that is necessary on Linux. */
|
|
|
860 assert (isatty (xforkin));
|
|
|
861 ioctl (xforkin, TIOCSCTTY, 0);
|
|
|
862 # endif /* TIOCSCTTY */
|
|
|
863
|
|
|
864 /* Change the line discipline. */
|
|
|
865
|
|
|
866 # if defined (HAVE_TERMIOS) && defined (LDISC1)
|
|
|
867 {
|
|
|
868 struct termios t;
|
|
|
869 assert (isatty (xforkin));
|
|
|
870 tcgetattr (xforkin, &t);
|
|
|
871 t.c_lflag = LDISC1;
|
|
|
872 if (tcsetattr (xforkin, TCSANOW, &t) < 0)
|
|
|
873 perror ("create_process/tcsetattr LDISC1 failed\n");
|
|
|
874 }
|
|
|
875 # elif defined (NTTYDISC) && defined (TIOCSETD)
|
|
|
876 {
|
|
|
877 /* Use new line discipline. TIOCSETD is accepted and
|
|
|
878 ignored on Sys5.4 systems with ttcompat. */
|
|
|
879 int ldisc = NTTYDISC;
|
|
|
880 assert (isatty (xforkin));
|
|
|
881 ioctl (xforkin, TIOCSETD, &ldisc);
|
|
|
882 }
|
|
|
883 # endif /* TIOCSETD & NTTYDISC */
|
|
|
884
|
|
|
885 /* Make our process group be the foreground group
|
|
|
886 of our new controlling terminal. */
|
|
|
887
|
|
|
888 {
|
|
|
889 int piddly = EMACS_GET_PROCESS_GROUP ();
|
|
|
890 EMACS_SET_TTY_PROCESS_GROUP (xforkin, &piddly);
|
|
|
891 }
|
|
|
892
|
|
|
893 /* On AIX, we've disabled SIGHUP above once we start a
|
|
|
894 child on a pty. Now reenable it in the child, so it
|
|
|
895 will die when we want it to.
|
|
|
896 JV: This needs to be done ALWAYS as we might have inherited
|
|
|
897 a SIG_IGN handling from our parent (nohup) and we are in new
|
|
|
898 process group.
|
|
|
899 */
|
|
|
900 signal (SIGHUP, SIG_DFL);
|
|
|
901 }
|
|
|
902
|
|
|
903 if (pty_flag)
|
|
|
904 /* Set up the terminal characteristics of the pty. */
|
|
|
905 child_setup_tty (xforkout);
|
|
|
906
|
|
|
907 #endif /* HAVE_PTYS */
|
|
|
908
|
|
|
909 signal (SIGINT, SIG_DFL);
|
|
|
910 signal (SIGQUIT, SIG_DFL);
|
|
|
911
|
|
|
912 {
|
|
|
913 char *current_dir;
|
|
|
914 char **new_argv = alloca_array (char *, nargv + 2);
|
|
|
915 int i;
|
|
|
916
|
|
|
917 /* Nothing below here GCs so our string pointers shouldn't move. */
|
|
|
918 new_argv[0] = (char *) XSTRING_DATA (program);
|
|
|
919 for (i = 0; i < nargv; i++)
|
|
|
920 {
|
|
|
921 CHECK_STRING (argv[i]);
|
|
|
922 new_argv[i + 1] = (char *) XSTRING_DATA (argv[i]);
|
|
|
923 }
|
|
|
924 new_argv[i + 1] = 0;
|
|
|
925
|
|
|
926 GET_C_STRING_FILENAME_DATA_ALLOCA (cur_dir, current_dir);
|
|
|
927
|
|
|
928 child_setup (xforkin, xforkout, xforkout, new_argv, current_dir);
|
|
|
929 }
|
|
|
930
|
|
|
931 } /**** End of child code ****/
|
|
|
932
|
|
|
933 /**** Back in parent process ****/
|
|
|
934 #if !defined(__CYGWIN32__)
|
|
|
935 environ = save_environ;
|
|
|
936 #endif
|
|
|
937 }
|
|
|
938
|
|
|
939 if (pid < 0)
|
|
|
940 {
|
|
|
941 close_descriptor_pair (forkin, forkout);
|
|
|
942 report_file_error ("Doing fork", Qnil);
|
|
|
943 }
|
|
|
944
|
|
|
945 /* #### dmoore - why is this commented out, otherwise we leave
|
|
|
946 subtty = forkin, but then we close forkin just below. */
|
|
|
947 /* UNIX_DATA(p)->subtty = -1; */
|
|
|
948
|
|
|
949 /* If the subfork execv fails, and it exits,
|
|
|
950 this close hangs. I don't know why.
|
|
|
951 So have an interrupt jar it loose. */
|
|
|
952 if (forkin >= 0)
|
|
|
953 close_safely (forkin);
|
|
|
954 if (forkin != forkout && forkout >= 0)
|
|
|
955 close (forkout);
|
|
|
956
|
|
|
957 #ifdef HAVE_PTYS
|
|
|
958 if (pty_flag)
|
|
|
959 UNIX_DATA (p)->tty_name = build_string (pty_name);
|
|
|
960 else
|
|
|
961 #endif
|
|
|
962 UNIX_DATA (p)->tty_name = Qnil;
|
|
|
963
|
|
|
964 /* Notice that SIGCHLD was not blocked. (This is not possible on
|
|
|
965 some systems.) No biggie if SIGCHLD occurs right around the
|
|
|
966 time that this call happens, because SIGCHLD() does not actually
|
|
|
967 deselect the process (that doesn't occur until the next time
|
|
|
968 we're waiting for an event, when status_notify() is called). */
|
|
|
969 return pid;
|
|
|
970
|
|
|
971 io_failure:
|
|
|
972 {
|
|
|
973 int save_errno = errno;
|
|
|
974 close_descriptor_pair (forkin, forkout);
|
|
|
975 close_descriptor_pair (inchannel, outchannel);
|
|
|
976 errno = save_errno;
|
|
|
977 report_file_error ("Opening pty or pipe", Qnil);
|
|
|
978 return 0; /* not reached */
|
|
|
979 }
|
|
|
980 }
|
|
|
981
|
|
|
982 /* Return nonzero if this process is a ToolTalk connection. */
|
|
|
983
|
|
|
984 static int
|
|
|
985 unix_tooltalk_connection_p (struct Lisp_Process *p)
|
|
|
986 {
|
|
|
987 return UNIX_DATA(p)->connected_via_filedesc_p;
|
|
|
988 }
|
|
|
989
|
|
|
990 /* This is called to set process' virtual terminal size */
|
|
|
991
|
|
|
992 static int
|
|
|
993 unix_set_window_size (struct Lisp_Process* p, int cols, int rows)
|
|
|
994 {
|
|
|
995 return set_window_size (UNIX_DATA(p)->infd, cols, rows);
|
|
|
996 }
|
|
|
997
|
|
|
998 /*
|
|
|
999 * This method is called to update status fields of the process
|
|
|
1000 * structure. If the process has not existed, this method is
|
|
|
1001 * expected to do nothing.
|
|
|
1002 *
|
|
|
1003 * The method is called only for real child processes.
|
|
|
1004 */
|
|
|
1005
|
|
|
1006 #ifdef HAVE_WAITPID
|
|
|
1007 static void
|
|
|
1008 unix_update_status_if_terminated (struct Lisp_Process* p)
|
|
|
1009 {
|
|
|
1010 int w;
|
|
|
1011 #ifdef SIGCHLD
|
|
|
1012 EMACS_BLOCK_SIGNAL (SIGCHLD);
|
|
|
1013 #endif
|
|
|
1014 if (waitpid (XINT (p->pid), &w, WNOHANG) == XINT (p->pid))
|
|
|
1015 {
|
|
|
1016 p->tick++;
|
|
|
1017 update_status_from_wait_code (p, &w);
|
|
|
1018 }
|
|
|
1019 #ifdef SIGCHLD
|
|
|
1020 EMACS_UNBLOCK_SIGNAL (SIGCHLD);
|
|
|
1021 #endif
|
|
|
1022 }
|
|
|
1023 #endif
|
|
|
1024
|
|
|
1025 /*
|
|
|
1026 * Update status of all exited processes. Called when SIGCLD has signaled.
|
|
|
1027 */
|
|
|
1028
|
|
|
1029 #ifdef SIGCHLD
|
|
|
1030 static void
|
|
|
1031 unix_reap_exited_processes (void)
|
|
|
1032 {
|
|
|
1033 int i;
|
|
|
1034 struct Lisp_Process *p;
|
|
|
1035
|
|
|
1036 #ifndef OBNOXIOUS_SYSV_SIGCLD_BEHAVIOR
|
|
|
1037 record_exited_processes (1);
|
|
|
1038 #endif
|
|
|
1039
|
|
|
1040 if (exited_processes_index <= 0)
|
|
|
1041 {
|
|
|
1042 return;
|
|
|
1043 }
|
|
|
1044
|
|
|
1045 #ifdef EMACS_BLOCK_SIGNAL
|
|
|
1046 EMACS_BLOCK_SIGNAL (SIGCHLD);
|
|
|
1047 #endif
|
|
|
1048 for (i = 0; i < exited_processes_index; i++)
|
|
|
1049 {
|
|
|
1050 int pid = exited_processes[i];
|
|
|
1051 int w = exited_processes_status[i];
|
|
|
1052
|
|
|
1053 /* Find the process that signaled us, and record its status. */
|
|
|
1054
|
|
|
1055 p = 0;
|
|
|
1056 {
|
|
|
1057 Lisp_Object tail;
|
|
|
1058 LIST_LOOP (tail, Vprocess_list)
|
|
|
1059 {
|
|
|
1060 Lisp_Object proc = XCAR (tail);
|
|
|
1061 p = XPROCESS (proc);
|
|
|
1062 if (INTP (p->pid) && XINT (p->pid) == pid)
|
|
|
1063 break;
|
|
|
1064 p = 0;
|
|
|
1065 }
|
|
|
1066 }
|
|
|
1067
|
|
|
1068 if (p)
|
|
|
1069 {
|
|
|
1070 /* Change the status of the process that was found. */
|
|
|
1071 p->tick++;
|
|
|
1072 process_tick++;
|
|
|
1073 update_status_from_wait_code (p, &w);
|
|
|
1074
|
|
|
1075 /* If process has terminated, stop waiting for its output. */
|
|
|
1076 if (WIFSIGNALED (w) || WIFEXITED (w))
|
|
|
1077 {
|
|
|
1078 if (!NILP(p->pipe_instream))
|
|
|
1079 {
|
|
|
1080 /* We can't just call event_stream->unselect_process_cb (p)
|
|
|
1081 here, because that calls XtRemoveInput, which is not
|
|
|
1082 necessarily reentrant, so we can't call this at interrupt
|
|
|
1083 level.
|
|
|
1084 */
|
|
|
1085 }
|
|
|
1086 }
|
|
|
1087 }
|
|
|
1088 else
|
|
|
1089 {
|
|
|
1090 /* There was no asynchronous process found for that id. Check
|
|
|
1091 if we have a synchronous process. Only set sync process status
|
|
|
1092 if there is one, so we work OK with the waitpid() call in
|
|
|
1093 wait_for_termination(). */
|
|
|
1094 if (synch_process_alive != 0)
|
|
|
1095 { /* Set the global sync process status variables. */
|
|
|
1096 synch_process_alive = 0;
|
|
|
1097
|
|
|
1098 /* Report the status of the synchronous process. */
|
|
|
1099 if (WIFEXITED (w))
|
|
|
1100 synch_process_retcode = WEXITSTATUS (w);
|
|
|
1101 else if (WIFSIGNALED (w))
|
|
|
1102 synch_process_death = signal_name (WTERMSIG (w));
|
|
|
1103 }
|
|
|
1104 }
|
|
|
1105 }
|
|
|
1106
|
|
|
1107 exited_processes_index = 0;
|
|
|
1108
|
|
|
1109 EMACS_UNBLOCK_SIGNAL (SIGCHLD);
|
|
|
1110 }
|
|
|
1111 #endif /* SIGCHLD */
|
|
|
1112
|
|
|
1113 /*
|
|
|
1114 * Stuff the entire contents of LSTREAM to the process output pipe
|
|
|
1115 */
|
|
|
1116
|
|
|
1117 static JMP_BUF send_process_frame;
|
|
|
1118
|
|
|
1119 static SIGTYPE
|
|
|
1120 send_process_trap (int signum)
|
|
|
1121 {
|
|
|
1122 EMACS_REESTABLISH_SIGNAL (signum, send_process_trap);
|
|
|
1123 EMACS_UNBLOCK_SIGNAL (signum);
|
|
|
1124 LONGJMP (send_process_frame, 1);
|
|
|
1125 }
|
|
|
1126
|
|
|
1127 static void
|
|
|
1128 unix_send_process (Lisp_Object proc, struct lstream* lstream)
|
|
|
1129 {
|
|
|
1130 /* Use volatile to protect variables from being clobbered by longjmp. */
|
|
|
1131 SIGTYPE (*volatile old_sigpipe) (int) = 0;
|
|
|
1132 volatile Lisp_Object vol_proc = proc;
|
|
|
1133 struct Lisp_Process *volatile p = XPROCESS (proc);
|
|
|
1134
|
|
|
1135 if (!SETJMP (send_process_frame))
|
|
|
1136 {
|
|
|
1137 /* use a reasonable-sized buffer (somewhere around the size of the
|
|
|
1138 stream buffer) so as to avoid inundating the stream with blocked
|
|
|
1139 data. */
|
|
|
1140 Bufbyte chunkbuf[512];
|
|
|
1141 Bytecount chunklen;
|
|
|
1142
|
|
|
1143 while (1)
|
|
|
1144 {
|
|
|
1145 ssize_t writeret;
|
|
|
1146
|
|
|
1147 chunklen = Lstream_read (lstream, chunkbuf, 512);
|
|
|
1148 if (chunklen <= 0)
|
|
|
1149 break; /* perhaps should abort() if < 0?
|
|
|
1150 This should never happen. */
|
|
|
1151 old_sigpipe =
|
|
|
1152 (SIGTYPE (*) (int)) signal (SIGPIPE, send_process_trap);
|
|
|
1153 /* Lstream_write() will never successfully write less than
|
|
|
1154 the amount sent in. In the worst case, it just buffers
|
|
|
1155 the unwritten data. */
|
|
|
1156 writeret = Lstream_write (XLSTREAM (DATA_OUTSTREAM(p)), chunkbuf,
|
|
|
1157 chunklen);
|
|
|
1158 signal (SIGPIPE, old_sigpipe);
|
|
|
1159 if (writeret < 0)
|
|
|
1160 /* This is a real error. Blocking errors are handled
|
|
|
1161 specially inside of the filedesc stream. */
|
|
|
1162 report_file_error ("writing to process", list1 (proc));
|
|
|
1163 while (Lstream_was_blocked_p (XLSTREAM (p->pipe_outstream)))
|
|
|
1164 {
|
|
|
1165 /* Buffer is full. Wait, accepting input;
|
|
|
1166 that may allow the program
|
|
|
1167 to finish doing output and read more. */
|
|
|
1168 Faccept_process_output (Qnil, make_int (1), Qnil);
|
|
|
1169 old_sigpipe =
|
|
|
1170 (SIGTYPE (*) (int)) signal (SIGPIPE, send_process_trap);
|
|
|
1171 Lstream_flush (XLSTREAM (p->pipe_outstream));
|
|
|
1172 signal (SIGPIPE, old_sigpipe);
|
|
|
1173 }
|
|
|
1174 }
|
|
|
1175 }
|
|
|
1176 else
|
|
|
1177 { /* We got here from a longjmp() from the SIGPIPE handler */
|
|
|
1178 signal (SIGPIPE, old_sigpipe);
|
|
|
1179 /* Close the file lstream so we don't attempt to write to it further */
|
|
|
1180 /* #### There is controversy over whether this might cause fd leakage */
|
|
|
1181 /* my tests say no. -slb */
|
|
|
1182 XLSTREAM (p->pipe_outstream)->flags &= ~LSTREAM_FL_IS_OPEN;
|
|
|
1183 p->status_symbol = Qexit;
|
|
|
1184 p->exit_code = 256; /* #### SIGPIPE ??? */
|
|
|
1185 p->core_dumped = 0;
|
|
|
1186 p->tick++;
|
|
|
1187 process_tick++;
|
|
|
1188 deactivate_process (*((Lisp_Object *) (&vol_proc)));
|
|
|
1189 error ("SIGPIPE raised on process %s; closed it",
|
|
|
1190 XSTRING_DATA (p->name));
|
|
|
1191 }
|
|
|
1192
|
|
|
1193 old_sigpipe = (SIGTYPE (*) (int)) signal (SIGPIPE, send_process_trap);
|
|
|
1194 Lstream_flush (XLSTREAM (DATA_OUTSTREAM(p)));
|
|
|
1195 signal (SIGPIPE, old_sigpipe);
|
|
|
1196 }
|
|
|
1197
|
|
|
1198 /*
|
|
|
1199 * Send EOF to the process. The default implementation simply
|
|
|
1200 * closes the output stream. The method must return 0 to call
|
|
|
1201 * the default implementation, or 1 if it has taken all care about
|
|
|
1202 * sending EOF to the process.
|
|
|
1203 */
|
|
|
1204
|
|
|
1205 static int
|
|
|
1206 unix_process_send_eof (Lisp_Object proc)
|
|
|
1207 {
|
|
|
1208 if (!UNIX_DATA (XPROCESS (proc))->pty_flag)
|
|
|
1209 return 0;
|
|
|
1210
|
|
|
1211 /* #### get_eof_char simply doesn't return the correct character
|
|
|
1212 here. Maybe it is needed to determine the right eof
|
|
|
1213 character in init_process_io_handles but here it simply screws
|
|
|
1214 things up. */
|
|
|
1215 #if 0
|
|
|
1216 Bufbyte eof_char = get_eof_char (XPROCESS (proc));
|
|
|
1217 send_process (proc, Qnil, &eof_char, 0, 1);
|
|
|
1218 #else
|
|
|
1219 send_process (proc, Qnil, (CONST Bufbyte *) "\004", 0, 1);
|
|
|
1220 #endif
|
|
|
1221 return 1;
|
|
|
1222 }
|
|
|
1223
|
|
|
1224 /*
|
|
|
1225 * Called before the process is deactivated. The process object
|
|
|
1226 * is not immediately finalized, just undergoes a transition to
|
|
|
1227 * inactive state.
|
|
|
1228 *
|
|
|
1229 * The return value is a unique stream ID, as returned by
|
|
|
1230 * event_stream_delete_stream_pair
|
|
|
1231 *
|
|
|
1232 * In the lack of this method, only event_stream_delete_stream_pair
|
|
|
1233 * is called on both I/O streams of the process.
|
|
|
1234 *
|
|
|
1235 * The UNIX version guards this by ignoring possible SIGPIPE.
|
|
|
1236 */
|
|
|
1237
|
|
|
1238 static USID
|
|
|
1239 unix_deactivate_process (struct Lisp_Process *p)
|
|
|
1240 {
|
|
|
1241 SIGTYPE (*old_sigpipe) (int) = 0;
|
|
|
1242 USID usid;
|
|
|
1243
|
|
|
1244 if (UNIX_DATA(p)->infd >= 0)
|
|
|
1245 flush_pending_output (UNIX_DATA(p)->infd);
|
|
|
1246
|
|
|
1247 /* closing the outstream could result in SIGPIPE, so ignore it. */
|
|
|
1248 old_sigpipe = (SIGTYPE (*) (int)) signal (SIGPIPE, SIG_IGN);
|
|
|
1249 usid = event_stream_delete_stream_pair (p->pipe_instream, p->pipe_outstream);
|
|
|
1250 signal (SIGPIPE, old_sigpipe);
|
|
|
1251
|
|
|
1252 UNIX_DATA(p)->infd = -1;
|
|
|
1253
|
|
|
1254 return usid;
|
|
|
1255 }
|
|
|
1256
|
|
|
1257 /* send a signal number SIGNO to PROCESS.
|
|
|
1258 CURRENT_GROUP means send to the process group that currently owns
|
|
|
1259 the terminal being used to communicate with PROCESS.
|
|
|
1260 This is used for various commands in shell mode.
|
|
|
1261 If NOMSG is zero, insert signal-announcements into process's buffers
|
|
|
1262 right away.
|
|
|
1263
|
|
|
1264 If we can, we try to signal PROCESS by sending control characters
|
|
|
1265 down the pty. This allows us to signal inferiors who have changed
|
|
|
1266 their uid, for which killpg would return an EPERM error.
|
|
|
1267
|
|
|
1268 The method signals an error if the given SIGNO is not valid
|
|
|
1269 */
|
|
|
1270
|
|
|
1271 static void
|
|
|
1272 unix_kill_child_process (Lisp_Object proc, int signo,
|
|
|
1273 int current_group, int nomsg)
|
|
|
1274 {
|
|
|
1275 int gid;
|
|
|
1276 int no_pgrp = 0;
|
|
|
1277 int kill_retval;
|
|
|
1278 struct Lisp_Process *p = XPROCESS (proc);
|
|
|
1279
|
|
|
1280 if (!UNIX_DATA(p)->pty_flag)
|
|
|
1281 current_group = 0;
|
|
|
1282
|
|
|
1283 /* If we are using pgrps, get a pgrp number and make it negative. */
|
|
|
1284 if (current_group)
|
|
|
1285 {
|
|
|
1286 #ifdef SIGNALS_VIA_CHARACTERS
|
|
|
1287 /* If possible, send signals to the entire pgrp
|
|
|
1288 by sending an input character to it. */
|
|
|
1289 {
|
|
|
1290 char sigchar = process_signal_char(UNIX_DATA(p)->subtty, signo);
|
|
|
1291 if (sigchar) {
|
|
|
1292 send_process (proc, Qnil, (Bufbyte *) &sigchar, 0, 1);
|
|
|
1293 return;
|
|
|
1294 }
|
|
|
1295 }
|
|
|
1296 #endif /* ! defined (SIGNALS_VIA_CHARACTERS) */
|
|
|
1297
|
|
|
1298 #ifdef TIOCGPGRP
|
|
|
1299 /* Get the pgrp using the tty itself, if we have that.
|
|
|
1300 Otherwise, use the pty to get the pgrp.
|
|
|
1301 On pfa systems, saka@pfu.fujitsu.co.JP writes:
|
|
|
1302 "TIOCGPGRP symbol defined in sys/ioctl.h at E50.
|
|
|
1303 But, TIOCGPGRP does not work on E50 ;-P works fine on E60"
|
|
|
1304 His patch indicates that if TIOCGPGRP returns an error, then
|
|
|
1305 we should just assume that p->pid is also the process group id. */
|
|
|
1306 {
|
|
|
1307 int err;
|
|
|
1308
|
|
|
1309 err = ioctl ( (UNIX_DATA(p)->subtty != -1
|
|
|
1310 ? UNIX_DATA(p)->subtty
|
|
|
1311 : UNIX_DATA(p)->infd), TIOCGPGRP, &gid);
|
|
|
1312
|
|
|
1313 #ifdef pfa
|
|
|
1314 if (err == -1)
|
|
|
1315 gid = - XINT (p->pid);
|
|
|
1316 #endif /* ! defined (pfa) */
|
|
|
1317 }
|
|
|
1318 if (gid == -1)
|
|
|
1319 no_pgrp = 1;
|
|
|
1320 else
|
|
|
1321 gid = - gid;
|
|
|
1322 #else /* ! defined (TIOCGPGRP ) */
|
|
|
1323 /* Can't select pgrps on this system, so we know that
|
|
|
1324 the child itself heads the pgrp. */
|
|
|
1325 gid = - XINT (p->pid);
|
|
|
1326 #endif /* ! defined (TIOCGPGRP ) */
|
|
|
1327 }
|
|
|
1328 else
|
|
|
1329 gid = - XINT (p->pid);
|
|
|
1330
|
|
|
1331 switch (signo)
|
|
|
1332 {
|
|
|
1333 #ifdef SIGCONT
|
|
|
1334 case SIGCONT:
|
|
|
1335 p->status_symbol = Qrun;
|
|
|
1336 p->exit_code = 0;
|
|
|
1337 p->tick++;
|
|
|
1338 process_tick++;
|
|
|
1339 if (!nomsg)
|
|
|
1340 status_notify ();
|
|
|
1341 break;
|
|
|
1342 #endif /* ! defined (SIGCONT) */
|
|
|
1343 case SIGINT:
|
|
|
1344 case SIGQUIT:
|
|
|
1345 case SIGKILL:
|
|
|
1346 flush_pending_output (UNIX_DATA(p)->infd);
|
|
|
1347 break;
|
|
|
1348 }
|
|
|
1349
|
|
|
1350 /* If we don't have process groups, send the signal to the immediate
|
|
|
1351 subprocess. That isn't really right, but it's better than any
|
|
|
1352 obvious alternative. */
|
|
|
1353 if (no_pgrp)
|
|
|
1354 {
|
|
|
1355 kill_retval = kill (XINT (p->pid), signo) ? errno : 0;
|
|
|
1356 }
|
|
|
1357 else
|
|
|
1358 {
|
|
|
1359 /* gid may be a pid, or minus a pgrp's number */
|
|
|
1360 #if defined (TIOCSIGNAL) || defined (TIOCSIGSEND)
|
|
|
1361 if (current_group)
|
|
|
1362 {
|
|
|
1363 #ifdef TIOCSIGNAL
|
|
|
1364 kill_retval = ioctl (UNIX_DATA(p)->infd, TIOCSIGNAL, signo);
|
|
|
1365 #else /* ! defined (TIOCSIGNAL) */
|
|
|
1366 kill_retval = ioctl (UNIX_DATA(p)->infd, TIOCSIGSEND, signo);
|
|
|
1367 #endif /* ! defined (TIOCSIGNAL) */
|
|
|
1368 }
|
|
|
1369 else
|
|
|
1370 kill_retval = kill (- XINT (p->pid), signo) ? errno : 0;
|
|
|
1371 #else /* ! (defined (TIOCSIGNAL) || defined (TIOCSIGSEND)) */
|
|
|
1372 kill_retval = EMACS_KILLPG (-gid, signo) ? errno : 0;
|
|
|
1373 #endif /* ! (defined (TIOCSIGNAL) || defined (TIOCSIGSEND)) */
|
|
|
1374 }
|
|
|
1375
|
|
|
1376 if (kill_retval < 0 && errno == EINVAL)
|
|
|
1377 error ("Signal number %d is invalid for this system", signo);
|
|
|
1378 }
|
|
|
1379
|
|
|
1380 /*
|
|
|
1381 * Kill any process in the system given its PID.
|
|
|
1382 *
|
|
|
1383 * Returns zero if a signal successfully sent, or
|
|
|
1384 * negative number upon failure
|
|
|
1385 */
|
|
|
1386
|
|
|
1387 static int
|
|
|
1388 unix_kill_process_by_pid (int pid, int sigcode)
|
|
|
1389 {
|
|
|
1390 return kill (pid, sigcode);
|
|
|
1391 }
|
|
|
1392
|
|
|
1393 /*
|
|
|
1394 * Return TTY name used to communicate with subprocess
|
|
|
1395 */
|
|
|
1396
|
|
|
1397 static Lisp_Object
|
|
|
1398 unix_get_tty_name (struct Lisp_Process *p)
|
|
|
1399 {
|
|
|
1400 return UNIX_DATA (p)->tty_name;
|
|
|
1401 }
|
|
|
1402
|
|
|
1403 /*
|
|
|
1404 * Canonicalize host name HOST, and return its canonical form
|
|
|
1405 *
|
|
|
1406 * The default implementation just takes HOST for a canonical name.
|
|
|
1407 */
|
|
|
1408
|
|
|
1409 #ifdef HAVE_SOCKETS
|
|
|
1410 static Lisp_Object
|
|
|
1411 unix_canonicalize_host_name (Lisp_Object host)
|
|
|
1412 {
|
|
|
1413 struct sockaddr_in address;
|
|
|
1414
|
|
|
1415 if (!get_internet_address (host, &address, ERROR_ME_NOT))
|
|
|
1416 return host;
|
|
|
1417
|
|
|
1418 if (address.sin_family == AF_INET)
|
|
|
1419 return build_string (inet_ntoa (address.sin_addr));
|
|
|
1420 else
|
|
|
1421 /* #### any clue what to do here? */
|
|
|
1422 return host;
|
|
|
1423 }
|
|
|
1424
|
|
|
1425 /* open a TCP network connection to a given HOST/SERVICE. Treated
|
|
|
1426 exactly like a normal process when reading and writing. Only
|
|
|
1427 differences are in status display and process deletion. A network
|
|
|
1428 connection has no PID; you cannot signal it. All you can do is
|
|
|
1429 deactivate and close it via delete-process */
|
|
|
1430
|
|
|
1431 static void
|
|
|
1432 unix_open_network_stream (Lisp_Object name, Lisp_Object host, Lisp_Object service,
|
|
|
1433 Lisp_Object protocol, void** vinfd, void** voutfd)
|
|
|
1434 {
|
|
|
1435 struct sockaddr_in address;
|
|
|
1436 int inch;
|
|
|
1437 int outch;
|
|
|
1438 volatile int s;
|
|
|
1439 volatile int port;
|
|
|
1440 volatile int retry = 0;
|
|
|
1441 int retval;
|
|
|
1442
|
|
|
1443 CHECK_STRING (host);
|
|
|
1444
|
|
|
1445 if (!EQ (protocol, Qtcp) && !EQ (protocol, Qudp))
|
|
|
1446 error ("Unsupported protocol \"%s\"",
|
|
|
1447 string_data (symbol_name (XSYMBOL (protocol))));
|
|
|
1448
|
|
|
1449 if (INTP (service))
|
|
|
1450 port = htons ((unsigned short) XINT (service));
|
|
|
1451 else
|
|
|
1452 {
|
|
|
1453 struct servent *svc_info;
|
|
|
1454 CHECK_STRING (service);
|
|
|
1455
|
|
|
1456 if (EQ (protocol, Qtcp))
|
|
|
1457 svc_info = getservbyname ((char *) XSTRING_DATA (service), "tcp");
|
|
|
1458 else /* EQ (protocol, Qudp) */
|
|
|
1459 svc_info = getservbyname ((char *) XSTRING_DATA (service), "udp");
|
|
|
1460
|
|
|
1461 if (svc_info == 0)
|
|
|
1462 error ("Unknown service \"%s\"", XSTRING_DATA (service));
|
|
|
1463 port = svc_info->s_port;
|
|
|
1464 }
|
|
|
1465
|
|
|
1466 get_internet_address (host, &address, ERROR_ME);
|
|
|
1467 address.sin_port = port;
|
|
|
1468
|
|
|
1469 if (EQ (protocol, Qtcp))
|
|
|
1470 s = socket (address.sin_family, SOCK_STREAM, 0);
|
|
|
1471 else /* EQ (protocol, Qudp) */
|
|
|
1472 s = socket (address.sin_family, SOCK_DGRAM, 0);
|
|
|
1473
|
|
|
1474 if (s < 0)
|
|
|
1475 report_file_error ("error creating socket", list1 (name));
|
|
|
1476
|
|
|
1477 /* Turn off interrupts here -- see comments below. There used to
|
|
|
1478 be code which called bind_polling_period() to slow the polling
|
|
|
1479 period down rather than turn it off, but that seems rather
|
|
|
1480 bogus to me. Best thing here is to use a non-blocking connect
|
|
|
1481 or something, to check for QUIT. */
|
|
|
1482
|
|
|
1483 /* Comments that are not quite valid: */
|
|
|
1484
|
|
|
1485 /* Kernel bugs (on Ultrix at least) cause lossage (not just EINTR)
|
|
|
1486 when connect is interrupted. So let's not let it get interrupted.
|
|
|
1487 Note we do not turn off polling, because polling is only used
|
|
|
1488 when not interrupt_input, and thus not normally used on the systems
|
|
|
1489 which have this bug. On systems which use polling, there's no way
|
|
|
1490 to quit if polling is turned off. */
|
|
|
1491
|
|
|
1492 /* Slow down polling. Some kernels have a bug which causes retrying
|
|
|
1493 connect to fail after a connect. */
|
|
|
1494
|
|
|
1495 slow_down_interrupts ();
|
|
|
1496
|
|
|
1497 loop:
|
|
|
1498
|
|
|
1499 /* A system call interrupted with a SIGALRM or SIGIO comes back
|
|
|
1500 here, with can_break_system_calls reset to 0. */
|
|
|
1501 SETJMP (break_system_call_jump);
|
|
|
1502 if (QUITP)
|
|
|
1503 {
|
|
|
1504 speed_up_interrupts ();
|
|
|
1505 REALLY_QUIT;
|
|
|
1506 /* In case something really weird happens ... */
|
|
|
1507 slow_down_interrupts ();
|
|
|
1508 }
|
|
|
1509
|
|
|
1510 /* Break out of connect with a signal (it isn't otherwise possible).
|
|
|
1511 Thus you don't get screwed with a hung network. */
|
|
|
1512 can_break_system_calls = 1;
|
|
|
1513 retval = connect (s, (struct sockaddr *) &address, sizeof (address));
|
|
|
1514 can_break_system_calls = 0;
|
|
|
1515 if (retval == -1 && errno != EISCONN)
|
|
|
1516 {
|
|
|
1517 int xerrno = errno;
|
|
|
1518 if (errno == EINTR)
|
|
|
1519 goto loop;
|
|
|
1520 if (errno == EADDRINUSE && retry < 20)
|
|
|
1521 {
|
|
|
1522 /* A delay here is needed on some FreeBSD systems,
|
|
|
1523 and it is harmless, since this retrying takes time anyway
|
|
|
1524 and should be infrequent.
|
|
|
1525 `sleep-for' allowed for quitting this loop with interrupts
|
|
|
1526 slowed down so it can't be used here. Async timers should
|
|
|
1527 already be disabled at this point so we can use `sleep'. */
|
|
|
1528 sleep (1);
|
|
|
1529 retry++;
|
|
|
1530 goto loop;
|
|
|
1531 }
|
|
|
1532
|
|
|
1533 close (s);
|
|
|
1534
|
|
|
1535 speed_up_interrupts ();
|
|
|
1536
|
|
|
1537 errno = xerrno;
|
|
|
1538 report_file_error ("connection failed", list2 (host, name));
|
|
|
1539 }
|
|
|
1540
|
|
|
1541 speed_up_interrupts ();
|
|
|
1542
|
|
|
1543 inch = s;
|
|
|
1544 outch = dup (s);
|
|
|
1545 if (outch < 0)
|
|
|
1546 {
|
|
|
1547 close (s); /* this used to be leaked; from Kyle Jones */
|
|
|
1548 report_file_error ("error duplicating socket", list1 (name));
|
|
|
1549 }
|
|
|
1550
|
|
|
1551 set_socket_nonblocking_maybe (inch, port, "tcp");
|
|
|
1552
|
|
|
1553 *vinfd = (void*)inch;
|
|
|
1554 *voutfd = (void*)outch;
|
|
|
1555 }
|
|
|
1556
|
|
|
1557
|
|
|
1558 #ifdef HAVE_MULTICAST
|
|
|
1559
|
|
|
1560 /* Didier Verna <verna@inf.enst.fr> Nov. 28 1997.
|
|
|
1561
|
|
|
1562 This function is similar to open-network-stream-internal, but provides a
|
|
|
1563 mean to open an UDP multicast connection instead of a TCP one. Like in the
|
|
|
1564 TCP case, the multicast connection will be seen as a sub-process,
|
|
|
1565
|
|
|
1566 Some notes:
|
|
|
1567 - Normally, we should use sendto and recvfrom with non connected
|
|
|
1568 sockets. The current code doesn't allow us to do this. In the future, it
|
|
|
1569 would be a good idea to extend the process data structure in order to deal
|
|
|
1570 properly with the different types network connections.
|
|
|
1571 - For the same reason, when leaving a multicast group, it is better to make
|
|
|
1572 a setsockopt - IP_DROP_MEMBERSHIP before closing the descriptors.
|
|
|
1573 Unfortunately, this can't be done here because delete_process doesn't know
|
|
|
1574 about the kind of connection we have. However, this is not such an
|
|
|
1575 important issue.
|
|
|
1576 */
|
|
|
1577
|
|
|
1578 static void
|
|
|
1579 unix_open_multicast_group (Lisp_Object name, Lisp_Object dest, Lisp_Object port,
|
|
|
1580 Lisp_Object ttl, void** vinfd, void** voutfd)
|
|
|
1581 {
|
|
|
1582 struct ip_mreq imr;
|
|
|
1583 struct sockaddr_in sa;
|
|
|
1584 struct protoent *udp;
|
|
|
1585 int ws, rs;
|
|
|
1586 int theport;
|
|
|
1587 unsigned char thettl;
|
|
|
1588 int one = 1; /* For REUSEADDR */
|
|
|
1589 int ret;
|
|
|
1590 volatile int retry = 0;
|
|
|
1591
|
|
|
1592 CHECK_STRING (dest);
|
|
|
1593
|
|
|
1594 CHECK_NATNUM (port);
|
|
|
1595 theport = htons ((unsigned short) XINT (port));
|
|
|
1596
|
|
|
1597 CHECK_NATNUM (ttl);
|
|
|
1598 thettl = (unsigned char) XINT (ttl);
|
|
|
1599
|
|
|
1600 if ((udp = getprotobyname ("udp")) == NULL)
|
|
|
1601 error ("No info available for UDP protocol");
|
|
|
1602
|
|
|
1603 /* Init the sockets. Yes, I need 2 sockets. I couldn't duplicate one. */
|
|
|
1604 if ((rs = socket (PF_INET, SOCK_DGRAM, udp->p_proto)) < 0)
|
|
|
1605 report_file_error ("error creating socket", list1(name));
|
|
|
1606 if ((ws = socket (PF_INET, SOCK_DGRAM, udp->p_proto)) < 0)
|
|
|
1607 {
|
|
|
1608 close (rs);
|
|
|
1609 report_file_error ("error creating socket", list1(name));
|
|
|
1610 }
|
|
|
1611
|
|
|
1612 /* This will be used for both sockets */
|
|
|
1613 memset (&sa, 0, sizeof(sa));
|
|
|
1614 sa.sin_family = AF_INET;
|
|
|
1615 sa.sin_port = theport;
|
|
|
1616 sa.sin_addr.s_addr = htonl (inet_addr ((char *) XSTRING_DATA (dest)));
|
|
|
1617
|
|
|
1618 /* Socket configuration for reading ------------------------ */
|
|
|
1619
|
|
|
1620 /* Multiple connections from the same machine. This must be done before
|
|
|
1621 bind. If it fails, it shouldn't be fatal. The only consequence is that
|
|
|
1622 people won't be able to connect twice from the same machine. */
|
|
|
1623 if (setsockopt (rs, SOL_SOCKET, SO_REUSEADDR, (char *) &one, sizeof (one))
|
|
|
1624 < 0)
|
|
|
1625 warn_when_safe (Qmulticast, Qwarning, "Cannot reuse socket address");
|
|
|
1626
|
|
|
1627 /* bind socket name */
|
|
|
1628 if (bind (rs, (struct sockaddr *)&sa, sizeof(sa)))
|
|
|
1629 {
|
|
|
1630 close (rs);
|
|
|
1631 close (ws);
|
|
|
1632 report_file_error ("error binding socket", list2(name, port));
|
|
|
1633 }
|
|
|
1634
|
|
|
1635 /* join multicast group */
|
|
|
1636 imr.imr_multiaddr.s_addr = htonl (inet_addr ((char *) XSTRING_DATA (dest)));
|
|
|
1637 imr.imr_interface.s_addr = htonl (INADDR_ANY);
|
|
|
1638 if (setsockopt (rs, IPPROTO_IP, IP_ADD_MEMBERSHIP,
|
|
|
1639 (char *) &imr, sizeof (struct ip_mreq)) < 0)
|
|
|
1640 {
|
|
|
1641 close (ws);
|
|
|
1642 close (rs);
|
|
|
1643 report_file_error ("error adding membership", list2(name, dest));
|
|
|
1644 }
|
|
|
1645
|
|
|
1646 /* Socket configuration for writing ----------------------- */
|
|
|
1647
|
|
|
1648 /* Normally, there's no 'connect' in multicast, since we prefer to use
|
|
|
1649 'sendto' and 'recvfrom'. However, in order to handle this connection in
|
|
|
1650 the process-like way it is done for TCP, we must be able to use 'write'
|
|
|
1651 instead of 'sendto'. Consequently, we 'connect' this socket. */
|
|
|
1652
|
|
|
1653 /* See open-network-stream-internal for comments on this part of the code */
|
|
|
1654 slow_down_interrupts ();
|
|
|
1655
|
|
|
1656 loop:
|
|
|
1657
|
|
|
1658 /* A system call interrupted with a SIGALRM or SIGIO comes back
|
|
|
1659 here, with can_break_system_calls reset to 0. */
|
|
|
1660 SETJMP (break_system_call_jump);
|
|
|
1661 if (QUITP)
|
|
|
1662 {
|
|
|
1663 speed_up_interrupts ();
|
|
|
1664 REALLY_QUIT;
|
|
|
1665 /* In case something really weird happens ... */
|
|
|
1666 slow_down_interrupts ();
|
|
|
1667 }
|
|
|
1668
|
|
|
1669 /* Break out of connect with a signal (it isn't otherwise possible).
|
|
|
1670 Thus you don't get screwed with a hung network. */
|
|
|
1671 can_break_system_calls = 1;
|
|
|
1672 ret = connect (ws, (struct sockaddr *) &sa, sizeof (sa));
|
|
|
1673 can_break_system_calls = 0;
|
|
|
1674 if (ret == -1 && errno != EISCONN)
|
|
|
1675 {
|
|
|
1676 int xerrno = errno;
|
|
|
1677
|
|
|
1678 if (errno == EINTR)
|
|
|
1679 goto loop;
|
|
|
1680 if (errno == EADDRINUSE && retry < 20)
|
|
|
1681 {
|
|
|
1682 /* A delay here is needed on some FreeBSD systems,
|
|
|
1683 and it is harmless, since this retrying takes time anyway
|
|
|
1684 and should be infrequent.
|
|
|
1685 `sleep-for' allowed for quitting this loop with interrupts
|
|
|
1686 slowed down so it can't be used here. Async timers should
|
|
|
1687 already be disabled at this point so we can use `sleep'. */
|
|
|
1688 sleep (1);
|
|
|
1689 retry++;
|
|
|
1690 goto loop;
|
|
|
1691 }
|
|
|
1692
|
|
|
1693 close (rs);
|
|
|
1694 close (ws);
|
|
|
1695 speed_up_interrupts ();
|
|
|
1696
|
|
|
1697 errno = xerrno;
|
|
|
1698 report_file_error ("error connecting socket", list2(name, port));
|
|
|
1699 }
|
|
|
1700
|
|
|
1701 speed_up_interrupts ();
|
|
|
1702
|
|
|
1703 /* scope */
|
|
|
1704 if (setsockopt (ws, IPPROTO_IP, IP_MULTICAST_TTL,
|
|
|
1705 (char *) &thettl, sizeof (thettl)) < 0)
|
|
|
1706 {
|
|
|
1707 close (rs);
|
|
|
1708 close (ws);
|
|
|
1709 report_file_error ("error setting ttl", list2(name, ttl));
|
|
|
1710 }
|
|
|
1711
|
|
|
1712 set_socket_nonblocking_maybe (rs, theport, "udp");
|
|
|
1713
|
|
|
1714 *vinfd = (void*)rs;
|
|
|
1715 *voutfd = (void*)ws;
|
|
|
1716 }
|
|
|
1717
|
|
|
1718 #endif /* HAVE_MULTICAST */
|
|
|
1719
|
|
|
1720 #endif /* HAVE_SOCKETS */
|
|
|
1721
|
|
|
1722
|
|
|
1723 /**********************************************************************/
|
|
|
1724 /* Initialization */
|
|
|
1725 /**********************************************************************/
|
|
|
1726
|
|
|
1727 void
|
|
|
1728 process_type_create_unix (void)
|
|
|
1729 {
|
|
|
1730 PROCESS_HAS_METHOD (unix, alloc_process_data);
|
|
|
1731 PROCESS_HAS_METHOD (unix, mark_process_data);
|
|
|
1732 #ifdef SIGCHLD
|
|
|
1733 PROCESS_HAS_METHOD (unix, init_process);
|
|
|
1734 PROCESS_HAS_METHOD (unix, reap_exited_processes);
|
|
|
1735 #endif
|
|
|
1736 PROCESS_HAS_METHOD (unix, init_process_io_handles);
|
|
|
1737 PROCESS_HAS_METHOD (unix, create_process);
|
|
|
1738 PROCESS_HAS_METHOD (unix, tooltalk_connection_p);
|
|
|
1739 PROCESS_HAS_METHOD (unix, set_window_size);
|
|
|
1740 #ifdef HAVE_WAITPID
|
|
|
1741 PROCESS_HAS_METHOD (unix, update_status_if_terminated);
|
|
|
1742 #endif
|
|
|
1743 PROCESS_HAS_METHOD (unix, send_process);
|
|
|
1744 PROCESS_HAS_METHOD (unix, process_send_eof);
|
|
|
1745 PROCESS_HAS_METHOD (unix, deactivate_process);
|
|
|
1746 PROCESS_HAS_METHOD (unix, kill_child_process);
|
|
|
1747 PROCESS_HAS_METHOD (unix, kill_process_by_pid);
|
|
|
1748 PROCESS_HAS_METHOD (unix, get_tty_name);
|
|
|
1749 #ifdef HAVE_SOCKETS
|
|
|
1750 PROCESS_HAS_METHOD (unix, canonicalize_host_name);
|
|
|
1751 PROCESS_HAS_METHOD (unix, open_network_stream);
|
|
|
1752 #ifdef HAVE_MULTICAST
|
|
|
1753 PROCESS_HAS_METHOD (unix, open_multicast_group);
|
|
|
1754 #endif
|
|
|
1755 #endif
|
|
|
1756 }
|
|
|
1757
|
|
|
1758 void
|
|
|
1759 vars_of_process_unix (void)
|
|
|
1760 {
|
|
|
1761 Fprovide (intern ("unix-processes"));
|
|
|
1762 }
|
|
|
1763
|
|
|
1764 #endif /* !defined (NO_SUBPROCESSES) */
|
