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0
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1 /* Synchronous subprocess invocation for XEmacs.
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2 Copyright (C) 1985, 86, 87, 88, 93, 94, 95 Free Software Foundation, Inc.
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3
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4 This file is part of XEmacs.
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5
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6 XEmacs is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License as published by the
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8 Free Software Foundation; either version 2, or (at your option) any
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9 later version.
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10
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11 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with XEmacs; see the file COPYING. If not, write to
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18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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19 Boston, MA 02111-1307, USA. */
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20
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21 /* Synched up with: Mule 2.0, FSF 19.30. */
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209
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22 /* Partly sync'ed with 19.36.4 */
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0
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23
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24 #include <config.h>
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25 #include "lisp.h"
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26
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27 #include "buffer.h"
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28 #include "commands.h"
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29 #include "insdel.h"
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30 #include "lstream.h"
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159
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31 #include <paths.h>
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0
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32 #include "process.h"
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33 #include "sysdep.h"
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34 #include "window.h"
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259
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35 #ifdef FILE_CODING
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36 #include "file-coding.h"
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70
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37 #endif
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0
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38
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39 #include "systime.h"
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40 #include "sysproc.h"
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100
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41 #include "sysfile.h" /* Always include after sysproc.h */
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0
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42 #include "syssignal.h" /* Always include before systty.h */
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43 #include "systty.h"
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44
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100
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45 #ifdef WINDOWSNT
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46 #define _P_NOWAIT 1 /* from process.h */
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288
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47 #include <windows.h>
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48 #include "nt.h"
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100
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49 #endif
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0
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50
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51 #ifdef DOS_NT
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52 /* When we are starting external processes we need to know whether they
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53 take binary input (no conversion) or text input (\n is converted to
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284
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54 \r\n). Similarly for output: if newlines are written as \r\n then it's
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0
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55 text process output, otherwise it's binary. */
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56 Lisp_Object Vbinary_process_input;
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57 Lisp_Object Vbinary_process_output;
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58 #endif /* DOS_NT */
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59
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60 Lisp_Object Vshell_file_name;
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61
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62 /* The environment to pass to all subprocesses when they are started.
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63 This is in the semi-bogus format of ("VAR=VAL" "VAR2=VAL2" ... )
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64 */
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65 Lisp_Object Vprocess_environment;
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66
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67 /* True iff we are about to fork off a synchronous process or if we
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68 are waiting for it. */
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69 volatile int synch_process_alive;
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70
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71 /* Nonzero => this is a string explaining death of synchronous subprocess. */
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72 CONST char *synch_process_death;
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73
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74 /* If synch_process_death is zero,
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75 this is exit code of synchronous subprocess. */
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76 int synch_process_retcode;
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77
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78 /* Clean up when exiting Fcall_process_internal.
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79 On MSDOS, delete the temporary file on any kind of termination.
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80 On Unix, kill the process and any children on termination by signal. */
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81
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82 /* Nonzero if this is termination due to exit. */
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83 static int call_process_exited;
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84
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85
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86 static Lisp_Object
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87 call_process_kill (Lisp_Object fdpid)
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88 {
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89 Lisp_Object fd = Fcar (fdpid);
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90 Lisp_Object pid = Fcdr (fdpid);
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91
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92 if (!NILP (fd))
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93 close (XINT (fd));
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94
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95 if (!NILP (pid))
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96 EMACS_KILLPG (XINT (pid), SIGKILL);
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185
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97
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0
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98 synch_process_alive = 0;
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99 return Qnil;
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100 }
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101
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102 static Lisp_Object
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103 call_process_cleanup (Lisp_Object fdpid)
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104 {
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105 int fd = XINT (Fcar (fdpid));
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106 int pid = XINT (Fcdr (fdpid));
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357
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107 #ifdef WINDOWSNT
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108 HANDLE pHandle;
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109 #endif
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0
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110
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111 if (!call_process_exited &&
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112 EMACS_KILLPG (pid, SIGINT) == 0)
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113 {
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114 int speccount = specpdl_depth ();
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115
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116 record_unwind_protect (call_process_kill, fdpid);
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117 /* #### "c-G" -- need non-consing Single-key-description */
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118 message ("Waiting for process to die...(type C-g again to kill it instantly)");
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119
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357
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120 #ifdef WINDOWSNT
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121 pHandle = OpenProcess(PROCESS_ALL_ACCESS, 0, pid);
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122 if (pHandle == NULL)
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123 {
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359
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124 warn_when_safe (Qprocess, Qerror,
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125 "OpenProcess returns NULL process handle.");
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357
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126 }
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127 wait_for_termination (pHandle);
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128 #else
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215
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129 wait_for_termination (pid);
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357
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130 #endif
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215
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131
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0
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132 /* "Discard" the unwind protect. */
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133 XCAR (fdpid) = Qnil;
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134 XCDR (fdpid) = Qnil;
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135 unbind_to (speccount, Qnil);
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136
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137 message ("Waiting for process to die... done");
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138 }
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139 synch_process_alive = 0;
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140 close (fd);
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141 return Qnil;
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142 }
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143
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144 static Lisp_Object fork_error;
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145 #if 0 /* UNUSED */
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146 static void
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147 report_fork_error (char *string, Lisp_Object data)
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148 {
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151
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149 Lisp_Object errstring = lisp_strerror (errno);
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0
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150
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151 fork_error = Fcons (build_string (string), Fcons (errstring, data));
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152
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153 /* terminate this branch of the fork, without closing stdin/out/etc. */
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154 _exit (1);
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155 }
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156 #endif /* unused */
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157
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20
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158 DEFUN ("call-process-internal", Fcall_process_internal, 1, MANY, 0, /*
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0
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159 Call PROGRAM synchronously in separate process, with coding-system specified.
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160 Arguments are
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161 (PROGRAM &optional INFILE BUFFER DISPLAY &rest ARGS).
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162 The program's input comes from file INFILE (nil means `/dev/null').
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163 Insert output in BUFFER before point; t means current buffer;
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164 nil for BUFFER means discard it; 0 means discard and don't wait.
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165 BUFFER can also have the form (REAL-BUFFER STDERR-FILE); in that case,
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166 REAL-BUFFER says what to do with standard output, as above,
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167 while STDERR-FILE says what to do with standard error in the child.
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168 STDERR-FILE may be nil (discard standard error output),
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169 t (mix it with ordinary output), or a file name string.
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170
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171 Fourth arg DISPLAY non-nil means redisplay buffer as output is inserted.
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172 Remaining arguments are strings passed as command arguments to PROGRAM.
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173
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174 If BUFFER is 0, `call-process' returns immediately with value nil.
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175 Otherwise it waits for PROGRAM to terminate and returns a numeric exit status
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176 or a signal description string.
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177 If you quit, the process is killed with SIGINT, or SIGKILL if you
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178 quit again.
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20
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179 */
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180 (int nargs, Lisp_Object *args))
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0
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181 {
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182 /* This function can GC */
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183 Lisp_Object infile, buffer, current_dir, display, path;
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184 int fd[2];
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185 int filefd;
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357
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186 #ifdef WINDOWSNT
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187 HANDLE pHandle;
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188 #endif
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0
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189 int pid;
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190 char buf[16384];
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191 char *bufptr = buf;
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192 int bufsize = 16384;
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193 int speccount = specpdl_depth ();
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209
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194 struct gcpro gcpro1, gcpro2;
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185
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195 char **new_argv = alloca_array (char *, max (2, nargs - 2));
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196
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0
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197 /* File to use for stderr in the child.
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198 t means use same as standard output. */
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199 Lisp_Object error_file;
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185
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200
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0
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201 CHECK_STRING (args[0]);
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202
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203 error_file = Qt;
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204
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80
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205 #if defined (NO_SUBPROCESSES)
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0
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206 /* Without asynchronous processes we cannot have BUFFER == 0. */
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207 if (nargs >= 3 && !INTP (args[2]))
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208 error ("Operating system cannot handle asynchronous subprocesses");
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14
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209 #endif /* NO_SUBPROCESSES */
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0
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210
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211 /* Do this before building new_argv because GC in Lisp code
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212 * called by various filename-hacking routines might relocate strings */
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213 locate_file (Vexec_path, args[0], EXEC_SUFFIXES, &path, X_OK);
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214
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215 /* Make sure that the child will be able to chdir to the current
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216 buffer's current directory, or its unhandled equivalent. We
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217 can't just have the child check for an error when it does the
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218 chdir, since it's in a vfork. */
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219 {
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169
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220 struct gcpro ngcpro1, ngcpro2;
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185
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221 /* Do this test before building new_argv because GC in Lisp code
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0
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222 * called by various filename-hacking routines might relocate strings */
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223 /* Make sure that the child will be able to chdir to the current
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224 buffer's current directory. We can't just have the child check
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225 for an error when it does the chdir, since it's in a vfork. */
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226
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367
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227 current_dir = current_buffer->directory;
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169
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228 NGCPRO2 (current_dir, path); /* Caller gcprotects args[] */
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116
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229 current_dir = Funhandled_file_name_directory (current_dir);
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230 current_dir = expand_and_dir_to_file (current_dir, Qnil);
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0
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231 #if 0
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276
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232 /* This is in FSF, but it breaks everything in the presence of
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233 ange-ftp-visited files, so away with it. */
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0
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234 if (NILP (Ffile_accessible_directory_p (current_dir)))
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235 report_file_error ("Setting current directory",
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236 Fcons (current_buffer->directory, Qnil));
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237 #endif /* 0 */
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169
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238 NUNGCPRO;
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0
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239 }
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240
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209
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241 GCPRO1 (current_dir);
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242
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0
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243 if (nargs >= 2 && ! NILP (args[1]))
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244 {
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169
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245 struct gcpro ngcpro1;
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246 NGCPRO1 (current_buffer->directory);
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14
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247 infile = Fexpand_file_name (args[1], current_buffer->directory);
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169
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248 NUNGCPRO;
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0
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249 CHECK_STRING (infile);
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250 }
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251 else
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252 infile = build_string (NULL_DEVICE);
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253
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209
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254 UNGCPRO;
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255
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256 GCPRO2 (infile, current_dir); /* Fexpand_file_name might trash it */
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116
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257
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0
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258 if (nargs >= 3)
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259 {
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260 buffer = args[2];
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261
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262 /* If BUFFER is a list, its meaning is
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263 (BUFFER-FOR-STDOUT FILE-FOR-STDERR). */
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264 if (CONSP (buffer))
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265 {
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266 if (CONSP (XCDR (buffer)))
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267 {
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268 Lisp_Object file_for_stderr = XCAR (XCDR (buffer));
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269
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270 if (NILP (file_for_stderr) || EQ (Qt, file_for_stderr))
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271 error_file = file_for_stderr;
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272 else
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273 error_file = Fexpand_file_name (file_for_stderr, Qnil);
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274 }
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275
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276 buffer = XCAR (buffer);
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277 }
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278
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279 if (!(EQ (buffer, Qnil)
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280 || EQ (buffer, Qt)
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281 || ZEROP (buffer)))
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282 {
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272
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283 Lisp_Object spec_buffer = buffer;
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0
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284 buffer = Fget_buffer (buffer);
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285 /* Mention the buffer name for a better error message. */
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286 if (NILP (buffer))
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287 CHECK_BUFFER (spec_buffer);
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288 CHECK_BUFFER (buffer);
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289 }
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290 }
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185
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291 else
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0
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292 buffer = Qnil;
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293
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116
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294 UNGCPRO;
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295
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0
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296 display = ((nargs >= 4) ? args[3] : Qnil);
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297
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14
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298 /* From here we assume we won't GC (unless an error is signaled). */
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0
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299 {
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300 REGISTER int i;
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301 for (i = 4; i < nargs; i++)
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302 {
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303 CHECK_STRING (args[i]);
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14
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304 new_argv[i - 3] = (char *) XSTRING_DATA (args[i]);
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0
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305 }
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306 }
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359
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307 new_argv[max(nargs - 3,1)] = 0;
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0
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308
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20
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309 if (NILP (path))
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310 report_file_error ("Searching for program", Fcons (args[0], Qnil));
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311 new_argv[0] = (char *) XSTRING_DATA (path);
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185
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312
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251
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313 filefd = open ((char *) XSTRING_DATA (infile), O_RDONLY | OPEN_BINARY, 0);
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0
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314 if (filefd < 0)
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20
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315 report_file_error ("Opening process input file", Fcons (infile, Qnil));
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0
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316
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317 if (INTP (buffer))
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318 {
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251
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319 fd[1] = open (NULL_DEVICE, O_WRONLY | OPEN_BINARY, 0);
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0
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320 fd[0] = -1;
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321 }
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322 else
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323 {
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324 pipe (fd);
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325 #if 0
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326 /* Replaced by close_process_descs */
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327 set_exclusive_use (fd[0]);
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328 #endif
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329 }
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263
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330
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0
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331 {
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263
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332 /* child_setup must clobber environ in systems with true vfork.
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0
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333 Protect it from permanent change. */
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334 REGISTER char **save_environ = environ;
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335 REGISTER int fd1 = fd[1];
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336 int fd_error = fd1;
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337 char **env;
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338
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339 #ifdef EMACS_BTL
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340 /* when performance monitoring is on, turn it off before the vfork(),
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341 as the child has no handler for the signal -- when back in the
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342 parent process, turn it back on if it was really on when you "turned
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343 it off" */
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344 int logging_on = cadillac_stop_logging ();
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|
14
|
345 #endif /* EMACS_BTL */
|
|
0
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346
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347 env = environ;
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348
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|
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349 /* Record that we're about to create a synchronous process. */
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350 synch_process_alive = 1;
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351
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|
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352 /* These vars record information from process termination.
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353 Clear them now before process can possibly terminate,
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354 to avoid timing error if process terminates soon. */
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355 synch_process_death = 0;
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356 synch_process_retcode = 0;
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357
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|
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358 if (NILP (error_file))
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251
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359 fd_error = open (NULL_DEVICE, O_WRONLY | OPEN_BINARY);
|
|
0
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360 else if (STRINGP (error_file))
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|
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361 {
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|
272
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362 fd_error = open ((CONST char *) XSTRING_DATA (error_file),
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0
|
363 #ifdef DOS_NT
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|
|
364 O_WRONLY | O_TRUNC | O_CREAT | O_TEXT,
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|
272
|
365 S_IREAD | S_IWRITE
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|
0
|
366 #else /* not DOS_NT */
|
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251
|
367 O_WRONLY | O_TRUNC | O_CREAT | OPEN_BINARY,
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|
272
|
368 CREAT_MODE
|
|
0
|
369 #endif /* not DOS_NT */
|
|
272
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370 );
|
|
0
|
371 }
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|
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372
|
|
|
373 if (fd_error < 0)
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|
|
374 {
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|
365
|
375 int save_errno = errno;
|
|
0
|
376 close (filefd);
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|
|
377 close (fd[0]);
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|
|
378 if (fd1 >= 0)
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|
|
379 close (fd1);
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|
365
|
380 errno = save_errno;
|
|
151
|
381 report_file_error ("Cannot open", Fcons(error_file, Qnil));
|
|
0
|
382 }
|
|
|
383
|
|
|
384 fork_error = Qnil;
|
|
|
385 #ifdef WINDOWSNT
|
|
185
|
386 pid = child_setup (filefd, fd1, fd_error, new_argv,
|
|
169
|
387 (char *) XSTRING_DATA (current_dir));
|
|
357
|
388 if (!INTP (buffer))
|
|
|
389 {
|
|
|
390 /* OpenProcess() as soon after child_setup as possible. It's too
|
|
|
391 late once the process terminated. */
|
|
|
392 pHandle = OpenProcess(PROCESS_ALL_ACCESS, 0, pid);
|
|
|
393 if (pHandle == NULL)
|
|
|
394 {
|
|
|
395 stderr_out ("Fcall_process_internal: pHandle == NULL, GetLastError () = %d, (int)pHandle = %d\n", GetLastError (), (int)pHandle);
|
|
|
396 }
|
|
|
397 }
|
|
|
398 /* Close STDERR into the parent process. We no longer need it. */
|
|
|
399 if (fd_error >= 0)
|
|
|
400 close (fd_error);
|
|
0
|
401 #else /* not WINDOWSNT */
|
|
167
|
402 pid = fork ();
|
|
0
|
403
|
|
|
404 if (pid == 0)
|
|
|
405 {
|
|
|
406 if (fd[0] >= 0)
|
|
|
407 close (fd[0]);
|
|
|
408 /* This is necessary because some shells may attempt to
|
|
|
409 access the current controlling terminal and will hang
|
|
|
410 if they are run in the background, as will be the case
|
|
|
411 when XEmacs is started in the background. Martin
|
|
|
412 Buchholz observed this problem running a subprocess
|
|
|
413 that used zsh to call gzip to uncompress an info
|
|
|
414 file. */
|
|
|
415 disconnect_controlling_terminal ();
|
|
|
416 child_setup (filefd, fd1, fd_error, new_argv,
|
|
14
|
417 (char *) XSTRING_DATA (current_dir));
|
|
0
|
418 }
|
|
|
419 #ifdef EMACS_BTL
|
|
|
420 else if (logging_on)
|
|
|
421 cadillac_start_logging ();
|
|
|
422 #endif
|
|
215
|
423 if (fd_error >= 0)
|
|
|
424 close (fd_error);
|
|
0
|
425
|
|
|
426 #endif /* not WINDOWSNT */
|
|
|
427
|
|
|
428 environ = save_environ;
|
|
|
429
|
|
|
430 /* Close most of our fd's, but not fd[0]
|
|
|
431 since we will use that to read input from. */
|
|
|
432 close (filefd);
|
|
|
433 if (fd1 >= 0)
|
|
|
434 close (fd1);
|
|
|
435 }
|
|
|
436
|
|
|
437 if (!NILP (fork_error))
|
|
|
438 signal_error (Qfile_error, fork_error);
|
|
|
439
|
|
357
|
440 #ifndef WINDOWSNT
|
|
0
|
441 if (pid < 0)
|
|
|
442 {
|
|
365
|
443 int save_errno = errno;
|
|
0
|
444 if (fd[0] >= 0)
|
|
|
445 close (fd[0]);
|
|
365
|
446 errno = save_errno;
|
|
167
|
447 report_file_error ("Doing fork", Qnil);
|
|
0
|
448 }
|
|
357
|
449 #endif
|
|
0
|
450
|
|
|
451 if (INTP (buffer))
|
|
|
452 {
|
|
|
453 if (fd[0] >= 0)
|
|
|
454 close (fd[0]);
|
|
80
|
455 #if defined (NO_SUBPROCESSES)
|
|
0
|
456 /* If Emacs has been built with asynchronous subprocess support,
|
|
|
457 we don't need to do this, I think because it will then have
|
|
|
458 the facilities for handling SIGCHLD. */
|
|
|
459 wait_without_blocking ();
|
|
14
|
460 #endif /* NO_SUBPROCESSES */
|
|
0
|
461 return Qnil;
|
|
|
462 }
|
|
|
463
|
|
|
464 {
|
|
|
465 int nread;
|
|
|
466 int first = 1;
|
|
|
467 int total_read = 0;
|
|
|
468 Lisp_Object instream;
|
|
169
|
469 struct gcpro ngcpro1;
|
|
0
|
470
|
|
|
471 /* Enable sending signal if user quits below. */
|
|
|
472 call_process_exited = 0;
|
|
|
473
|
|
|
474 record_unwind_protect (call_process_cleanup,
|
|
|
475 Fcons (make_int (fd[0]), make_int (pid)));
|
|
|
476
|
|
|
477 /* FSFmacs calls Fset_buffer() here. We don't have to because
|
|
|
478 we can insert into buffers other than the current one. */
|
|
|
479 if (EQ (buffer, Qt))
|
|
|
480 XSETBUFFER (buffer, current_buffer);
|
|
|
481 instream = make_filedesc_input_stream (fd[0], 0, -1, LSTR_ALLOW_QUIT);
|
|
259
|
482 #ifdef FILE_CODING
|
|
70
|
483 instream =
|
|
|
484 make_decoding_input_stream
|
|
|
485 (XLSTREAM (instream),
|
|
120
|
486 Fget_coding_system (Vcoding_system_for_read));
|
|
70
|
487 Lstream_set_character_mode (XLSTREAM (instream));
|
|
259
|
488 #endif
|
|
169
|
489 NGCPRO1 (instream);
|
|
0
|
490 while (1)
|
|
|
491 {
|
|
|
492 QUIT;
|
|
|
493 /* Repeatedly read until we've filled as much as possible
|
|
|
494 of the buffer size we have. But don't read
|
|
|
495 less than 1024--save that for the next bufferfull. */
|
|
|
496
|
|
|
497 nread = 0;
|
|
|
498 while (nread < bufsize - 1024)
|
|
|
499 {
|
|
|
500 int this_read
|
|
|
501 = Lstream_read (XLSTREAM (instream), bufptr + nread,
|
|
|
502 bufsize - nread);
|
|
|
503
|
|
|
504 if (this_read < 0)
|
|
|
505 goto give_up;
|
|
|
506
|
|
|
507 if (this_read == 0)
|
|
|
508 goto give_up_1;
|
|
|
509
|
|
|
510 nread += this_read;
|
|
|
511 }
|
|
|
512
|
|
|
513 give_up_1:
|
|
|
514
|
|
|
515 /* Now NREAD is the total amount of data in the buffer. */
|
|
|
516 if (nread == 0)
|
|
|
517 break;
|
|
|
518
|
|
213
|
519 #ifdef DOS_NT
|
|
|
520 /* Until we pull out of MULE things like
|
|
|
521 make_decoding_input_stream(), we do the following which is
|
|
|
522 less elegant. --marcpa */
|
|
|
523 {
|
|
215
|
524 int lf_count = 0;
|
|
213
|
525 if (NILP (Vbinary_process_output)) {
|
|
215
|
526 nread = crlf_to_lf(nread, bufptr, &lf_count);
|
|
213
|
527 }
|
|
|
528 }
|
|
|
529 #endif
|
|
|
530
|
|
0
|
531 total_read += nread;
|
|
185
|
532
|
|
0
|
533 if (!NILP (buffer))
|
|
|
534 buffer_insert_raw_string (XBUFFER (buffer), (Bufbyte *) bufptr,
|
|
|
535 nread);
|
|
|
536
|
|
|
537 /* Make the buffer bigger as we continue to read more data,
|
|
|
538 but not past 64k. */
|
|
|
539 if (bufsize < 64 * 1024 && total_read > 32 * bufsize)
|
|
|
540 {
|
|
|
541 bufsize *= 2;
|
|
|
542 bufptr = (char *) alloca (bufsize);
|
|
|
543 }
|
|
|
544
|
|
|
545 if (!NILP (display) && INTERACTIVE)
|
|
|
546 {
|
|
|
547 first = 0;
|
|
|
548 redisplay ();
|
|
|
549 }
|
|
|
550 }
|
|
|
551 give_up:
|
|
|
552 Lstream_close (XLSTREAM (instream));
|
|
169
|
553 NUNGCPRO;
|
|
0
|
554
|
|
|
555 QUIT;
|
|
|
556 /* Wait for it to terminate, unless it already has. */
|
|
357
|
557 #ifdef WINDOWSNT
|
|
|
558 wait_for_termination (pHandle);
|
|
|
559 #else
|
|
0
|
560 wait_for_termination (pid);
|
|
357
|
561 #endif
|
|
0
|
562
|
|
|
563 /* Don't kill any children that the subprocess may have left behind
|
|
|
564 when exiting. */
|
|
|
565 call_process_exited = 1;
|
|
|
566 unbind_to (speccount, Qnil);
|
|
|
567
|
|
|
568 if (synch_process_death)
|
|
|
569 return build_string (synch_process_death);
|
|
|
570 return make_int (synch_process_retcode);
|
|
|
571 }
|
|
|
572 }
|
|
|
573
|
|
|
574
|
|
|
575
|
|
|
576 /* This is the last thing run in a newly forked inferior
|
|
|
577 either synchronous or asynchronous.
|
|
|
578 Copy descriptors IN, OUT and ERR as descriptors 0, 1 and 2.
|
|
|
579 Initialize inferior's priority, pgrp, connected dir and environment.
|
|
|
580 then exec another program based on new_argv.
|
|
|
581
|
|
|
582 This function may change environ for the superior process.
|
|
|
583 Therefore, the superior process must save and restore the value
|
|
167
|
584 of environ around the fork and the call to this function.
|
|
0
|
585
|
|
|
586 ENV is the environment for the subprocess.
|
|
|
587
|
|
|
588 XEmacs: We've removed the SET_PGRP argument because it's already
|
|
|
589 done by the callers of child_setup.
|
|
|
590
|
|
|
591 CURRENT_DIR is an elisp string giving the path of the current
|
|
|
592 directory the subprocess should have. Since we can't really signal
|
|
|
593 a decent error from within the child, this should be verified as an
|
|
|
594 executable directory by the parent. */
|
|
|
595
|
|
|
596 static int relocate_fd (int fd, int min);
|
|
|
597
|
|
100
|
598 #ifdef WINDOWSNT
|
|
|
599 int
|
|
|
600 #else
|
|
0
|
601 void
|
|
100
|
602 #endif
|
|
0
|
603 child_setup (int in, int out, int err, char **new_argv,
|
|
|
604 CONST char *current_dir)
|
|
|
605 {
|
|
|
606 char **env;
|
|
|
607 char *pwd;
|
|
|
608 #ifdef WINDOWSNT
|
|
|
609 int cpid;
|
|
|
610 HANDLE handles[4];
|
|
|
611 #endif /* WINDOWSNT */
|
|
|
612
|
|
|
613 #ifdef SET_EMACS_PRIORITY
|
|
|
614 if (emacs_priority != 0)
|
|
|
615 nice (- emacs_priority);
|
|
|
616 #endif
|
|
|
617
|
|
363
|
618 /* Under Windows, we are not in a child process at all, so we should
|
|
|
619 not close handles inherited from the parent -- we are the parent
|
|
|
620 and doing so will screw up all manner of things! Similarly, most
|
|
|
621 of the rest of the cleanup done in this function is not done
|
|
|
622 under Windows.
|
|
|
623
|
|
|
624 #### This entire child_setup() function is an utter and complete
|
|
|
625 piece of shit. I would rewrite it, at the very least splitting
|
|
|
626 out the Windows and non-Windows stuff into two completely
|
|
|
627 different functions; but instead I'm trying to make it go away
|
|
|
628 entirely, using the Lisp definition in process.el. What's left
|
|
|
629 is to fix up the routines in event-msw.c (and in event-Xt.c and
|
|
|
630 event-tty.c) to allow for stream devices to be handled correctly.
|
|
|
631 There isn't much to do, in fact, and I'll fix it shortly. That
|
|
|
632 way, the Lisp definition can be used non-interactively too. */
|
|
263
|
633 #if !defined (NO_SUBPROCESSES) && !defined (WINDOWSNT)
|
|
0
|
634 /* Close Emacs's descriptors that this process should not have. */
|
|
|
635 close_process_descs ();
|
|
20
|
636 #endif /* not NO_SUBPROCESSES */
|
|
363
|
637 #ifndef WINDOWSNT
|
|
0
|
638 close_load_descs ();
|
|
363
|
639 #endif
|
|
0
|
640
|
|
|
641 /* Note that use of alloca is always safe here. It's obvious for systems
|
|
|
642 that do not have true vfork or that have true (stack) alloca.
|
|
|
643 If using vfork and C_ALLOCA it is safe because that changes
|
|
|
644 the superior's static variables as if the superior had done alloca
|
|
|
645 and will be cleaned up in the usual way. */
|
|
|
646 {
|
|
|
647 REGISTER int i;
|
|
|
648
|
|
|
649 i = strlen (current_dir);
|
|
185
|
650 pwd = alloca_array (char, i + 6);
|
|
0
|
651 memcpy (pwd, "PWD=", 4);
|
|
|
652 memcpy (pwd + 4, current_dir, i);
|
|
|
653 i += 4;
|
|
|
654 if (!IS_DIRECTORY_SEP (pwd[i - 1]))
|
|
|
655 pwd[i++] = DIRECTORY_SEP;
|
|
|
656 pwd[i] = 0;
|
|
|
657
|
|
|
658 /* We can't signal an Elisp error here; we're in a vfork. Since
|
|
|
659 the callers check the current directory before forking, this
|
|
|
660 should only return an error if the directory's permissions
|
|
|
661 are changed between the check and this chdir, but we should
|
|
|
662 at least check. */
|
|
|
663 if (chdir (pwd + 4) < 0)
|
|
|
664 {
|
|
|
665 /* Don't report the chdir error, or ange-ftp.el doesn't work. */
|
|
|
666 /* (FSFmacs does _exit (errno) here.) */
|
|
|
667 pwd = 0;
|
|
|
668 }
|
|
|
669 else
|
|
|
670 {
|
|
|
671 /* Strip trailing "/". Cretinous *[]&@$#^%@#$% Un*x */
|
|
|
672 /* leave "//" (from FSF) */
|
|
|
673 while (i > 6 && IS_DIRECTORY_SEP (pwd[i - 1]))
|
|
|
674 pwd[--i] = 0;
|
|
|
675 }
|
|
|
676 }
|
|
|
677
|
|
|
678 /* Set `env' to a vector of the strings in Vprocess_environment. */
|
|
|
679 {
|
|
|
680 REGISTER Lisp_Object tem;
|
|
|
681 REGISTER char **new_env;
|
|
272
|
682 REGISTER int new_length = 0;
|
|
0
|
683
|
|
|
684 for (tem = Vprocess_environment;
|
|
|
685 (CONSP (tem)
|
|
|
686 && STRINGP (XCAR (tem)));
|
|
|
687 tem = XCDR (tem))
|
|
|
688 new_length++;
|
|
|
689
|
|
|
690 /* new_length + 2 to include PWD and terminating 0. */
|
|
185
|
691 env = new_env = alloca_array (char *, new_length + 2);
|
|
0
|
692
|
|
|
693 /* If we have a PWD envvar and we know the real current directory,
|
|
|
694 pass one down, but with corrected value. */
|
|
|
695 if (pwd && getenv ("PWD"))
|
|
|
696 *new_env++ = pwd;
|
|
|
697
|
|
|
698 /* Copy the Vprocess_environment strings into new_env. */
|
|
|
699 for (tem = Vprocess_environment;
|
|
|
700 (CONSP (tem)
|
|
|
701 && STRINGP (XCAR (tem)));
|
|
|
702 tem = XCDR (tem))
|
|
|
703 {
|
|
|
704 char **ep = env;
|
|
14
|
705 char *string = (char *) XSTRING_DATA (XCAR (tem));
|
|
0
|
706 /* See if this string duplicates any string already in the env.
|
|
|
707 If so, don't put it in.
|
|
|
708 When an env var has multiple definitions,
|
|
|
709 we keep the definition that comes first in process-environment. */
|
|
|
710 for (; ep != new_env; ep++)
|
|
|
711 {
|
|
|
712 char *p = *ep, *q = string;
|
|
|
713 while (1)
|
|
|
714 {
|
|
|
715 if (*q == 0)
|
|
|
716 /* The string is malformed; might as well drop it. */
|
|
|
717 goto duplicate;
|
|
|
718 if (*q != *p)
|
|
|
719 break;
|
|
|
720 if (*q == '=')
|
|
|
721 goto duplicate;
|
|
|
722 p++, q++;
|
|
|
723 }
|
|
|
724 }
|
|
|
725 if (pwd && !strncmp ("PWD=", string, 4))
|
|
|
726 {
|
|
|
727 *new_env++ = pwd;
|
|
|
728 pwd = 0;
|
|
|
729 }
|
|
|
730 else
|
|
|
731 *new_env++ = string;
|
|
|
732 duplicate: ;
|
|
|
733 }
|
|
|
734 *new_env = 0;
|
|
|
735 }
|
|
|
736 #ifdef WINDOWSNT
|
|
|
737 prepare_standard_handles (in, out, err, handles);
|
|
209
|
738 set_process_dir (current_dir);
|
|
0
|
739 #else /* not WINDOWSNT */
|
|
|
740 /* Make sure that in, out, and err are not actually already in
|
|
|
741 descriptors zero, one, or two; this could happen if Emacs is
|
|
|
742 started with its standard in, out, or error closed, as might
|
|
|
743 happen under X. */
|
|
|
744 {
|
|
|
745 int oin = in, oout = out;
|
|
|
746
|
|
|
747 /* We have to avoid relocating the same descriptor twice! */
|
|
|
748
|
|
|
749 in = relocate_fd (in, 3);
|
|
|
750
|
|
|
751 if (out == oin) out = in;
|
|
|
752 else out = relocate_fd (out, 3);
|
|
|
753
|
|
|
754 if (err == oin) err = in;
|
|
|
755 else if (err == oout) err = out;
|
|
|
756 else err = relocate_fd (err, 3);
|
|
|
757 }
|
|
|
758
|
|
|
759 close (0);
|
|
|
760 close (1);
|
|
|
761 close (2);
|
|
|
762
|
|
|
763 dup2 (in, 0);
|
|
|
764 dup2 (out, 1);
|
|
|
765 dup2 (err, 2);
|
|
185
|
766
|
|
0
|
767 close (in);
|
|
|
768 close (out);
|
|
|
769 close (err);
|
|
|
770
|
|
|
771 /* I can't think of any reason why child processes need any more
|
|
|
772 than the standard 3 file descriptors. It would be cleaner to
|
|
|
773 close just the ones that need to be, but the following brute
|
|
|
774 force approach is certainly effective, and not too slow. */
|
|
|
775 {
|
|
|
776 int fd;
|
|
|
777 for (fd=3; fd<=64; fd++)
|
|
|
778 {
|
|
|
779 close(fd);
|
|
|
780 }
|
|
|
781 }
|
|
|
782 #endif /* not WINDOWSNT */
|
|
|
783
|
|
|
784 #ifdef vipc
|
|
|
785 something missing here;
|
|
|
786 #endif /* vipc */
|
|
|
787
|
|
|
788 #ifdef WINDOWSNT
|
|
|
789 /* Spawn the child. (See ntproc.c:Spawnve). */
|
|
|
790 cpid = spawnve (_P_NOWAIT, new_argv[0], new_argv, env);
|
|
|
791 if (cpid == -1)
|
|
|
792 /* An error occurred while trying to spawn the process. */
|
|
|
793 report_file_error ("Spawning child process", Qnil);
|
|
|
794 reset_standard_handles (in, out, err, handles);
|
|
|
795 return cpid;
|
|
|
796 #else /* not WINDOWSNT */
|
|
|
797 /* execvp does not accept an environment arg so the only way
|
|
|
798 to pass this environment is to set environ. Our caller
|
|
|
799 is responsible for restoring the ambient value of environ. */
|
|
|
800 environ = env;
|
|
|
801 execvp (new_argv[0], new_argv);
|
|
|
802
|
|
321
|
803 stdout_out ("Can't exec program %s\n", new_argv[0]);
|
|
0
|
804 _exit (1);
|
|
|
805 #endif /* not WINDOWSNT */
|
|
|
806 }
|
|
|
807
|
|
|
808 /* Move the file descriptor FD so that its number is not less than MIN.
|
|
|
809 If the file descriptor is moved at all, the original is freed. */
|
|
|
810 static int
|
|
|
811 relocate_fd (int fd, int min)
|
|
|
812 {
|
|
|
813 if (fd >= min)
|
|
|
814 return fd;
|
|
|
815 else
|
|
|
816 {
|
|
|
817 int new = dup (fd);
|
|
|
818 if (new == -1)
|
|
|
819 {
|
|
|
820 stderr_out ("Error while setting up child: %s\n",
|
|
|
821 strerror (errno));
|
|
|
822 _exit (1);
|
|
|
823 }
|
|
|
824 /* Note that we hold the original FD open while we recurse,
|
|
|
825 to guarantee we'll get a new FD if we need it. */
|
|
|
826 new = relocate_fd (new, min);
|
|
|
827 close (fd);
|
|
|
828 return new;
|
|
|
829 }
|
|
|
830 }
|
|
|
831
|
|
|
832 static int
|
|
|
833 getenv_internal (CONST Bufbyte *var,
|
|
|
834 Bytecount varlen,
|
|
|
835 Bufbyte **value,
|
|
|
836 Bytecount *valuelen)
|
|
|
837 {
|
|
|
838 Lisp_Object scan;
|
|
|
839
|
|
|
840 for (scan = Vprocess_environment; CONSP (scan); scan = XCDR (scan))
|
|
|
841 {
|
|
|
842 Lisp_Object entry = XCAR (scan);
|
|
185
|
843
|
|
0
|
844 if (STRINGP (entry)
|
|
14
|
845 && XSTRING_LENGTH (entry) > varlen
|
|
80
|
846 && XSTRING_BYTE (entry, varlen) == '='
|
|
0
|
847 #ifdef WINDOWSNT
|
|
|
848 /* NT environment variables are case insensitive. */
|
|
14
|
849 && ! memicmp (XSTRING_DATA (entry), var, varlen)
|
|
0
|
850 #else /* not WINDOWSNT */
|
|
14
|
851 && ! memcmp (XSTRING_DATA (entry), var, varlen)
|
|
0
|
852 #endif /* not WINDOWSNT */
|
|
|
853 )
|
|
|
854 {
|
|
14
|
855 *value = XSTRING_DATA (entry) + (varlen + 1);
|
|
|
856 *valuelen = XSTRING_LENGTH (entry) - (varlen + 1);
|
|
0
|
857 return 1;
|
|
|
858 }
|
|
|
859 }
|
|
|
860
|
|
|
861 return 0;
|
|
|
862 }
|
|
|
863
|
|
20
|
864 DEFUN ("getenv", Fgetenv, 1, 2, "sEnvironment variable: \np", /*
|
|
0
|
865 Return the value of environment variable VAR, as a string.
|
|
|
866 VAR is a string, the name of the variable.
|
|
|
867 When invoked interactively, prints the value in the echo area.
|
|
20
|
868 */
|
|
|
869 (var, interactivep))
|
|
0
|
870 {
|
|
|
871 Bufbyte *value;
|
|
|
872 Bytecount valuelen;
|
|
|
873 Lisp_Object v = Qnil;
|
|
|
874 struct gcpro gcpro1;
|
|
|
875
|
|
|
876 CHECK_STRING (var);
|
|
|
877 GCPRO1 (v);
|
|
14
|
878 if (getenv_internal (XSTRING_DATA (var), XSTRING_LENGTH (var),
|
|
0
|
879 &value, &valuelen))
|
|
|
880 v = make_string (value, valuelen);
|
|
|
881 if (!NILP (interactivep))
|
|
|
882 {
|
|
|
883 if (NILP (v))
|
|
14
|
884 message ("%s not defined in environment", XSTRING_DATA (var));
|
|
0
|
885 else
|
|
288
|
886 /* #### Should use Fprin1_to_string or Fprin1 to handle string
|
|
|
887 containing quotes correctly. */
|
|
0
|
888 message ("\"%s\"", value);
|
|
|
889 }
|
|
|
890 RETURN_UNGCPRO (v);
|
|
|
891 }
|
|
|
892
|
|
|
893 /* A version of getenv that consults process_environment, easily
|
|
|
894 callable from C. */
|
|
|
895 char *
|
|
|
896 egetenv (CONST char *var)
|
|
|
897 {
|
|
|
898 Bufbyte *value;
|
|
|
899 Bytecount valuelen;
|
|
|
900
|
|
|
901 if (getenv_internal ((CONST Bufbyte *) var, strlen (var), &value, &valuelen))
|
|
|
902 return (char *) value;
|
|
|
903 else
|
|
|
904 return 0;
|
|
|
905 }
|
|
|
906
|
|
|
907
|
|
|
908 void
|
|
|
909 init_callproc (void)
|
|
|
910 {
|
|
|
911 /* This function can GC */
|
|
|
912 REGISTER char *sh;
|
|
|
913
|
|
|
914 Vprocess_environment = Qnil;
|
|
|
915 /* jwz: always initialize Vprocess_environment, so that egetenv() works
|
|
|
916 in temacs. */
|
|
|
917 {
|
|
|
918 char **envp;
|
|
|
919 for (envp = environ; envp && *envp; envp++)
|
|
259
|
920 {
|
|
|
921 Vprocess_environment = Fcons (build_ext_string (*envp, FORMAT_OS),
|
|
|
922 Vprocess_environment);
|
|
|
923 }
|
|
0
|
924 }
|
|
|
925
|
|
209
|
926 #ifdef WINDOWSNT
|
|
|
927 /* Sync with FSF Emacs 19.34.6 note: this is not in 19.34.6. --marcpa */
|
|
179
|
928 /*
|
|
|
929 ** If NT then we look at COMSPEC for the shell program.
|
|
|
930 */
|
|
|
931 sh = egetenv ("COMSPEC");
|
|
288
|
932 /*
|
|
|
933 ** If COMSPEC has been set, then convert the
|
|
|
934 ** DOS formatted name into a UNIX format. Then
|
|
|
935 ** create a LISP object.
|
|
|
936 */
|
|
|
937 if (sh)
|
|
|
938 Vshell_file_name = build_string (sh);
|
|
|
939 /*
|
|
|
940 ** Odd, no COMSPEC, so let's default to our
|
|
|
941 ** best guess for NT.
|
|
|
942 */
|
|
|
943 else
|
|
|
944 Vshell_file_name = build_string ("\\WINNT\\system32\\cmd.exe");
|
|
|
945
|
|
209
|
946 #else /* not WINDOWSNT */
|
|
288
|
947
|
|
179
|
948 sh = (char *) egetenv ("SHELL");
|
|
0
|
949 Vshell_file_name = build_string (sh ? sh : "/bin/sh");
|
|
288
|
950
|
|
185
|
951 #endif
|
|
0
|
952 }
|
|
|
953
|
|
|
954 #if 0
|
|
|
955 void
|
|
|
956 set_process_environment (void)
|
|
|
957 {
|
|
|
958 REGISTER char **envp;
|
|
|
959
|
|
|
960 Vprocess_environment = Qnil;
|
|
|
961 #ifndef CANNOT_DUMP
|
|
|
962 if (initialized)
|
|
|
963 #endif
|
|
|
964 for (envp = environ; *envp; envp++)
|
|
|
965 Vprocess_environment = Fcons (build_string (*envp),
|
|
|
966 Vprocess_environment);
|
|
|
967 }
|
|
|
968 #endif /* unused */
|
|
|
969
|
|
|
970 void
|
|
|
971 syms_of_callproc (void)
|
|
|
972 {
|
|
20
|
973 DEFSUBR (Fcall_process_internal);
|
|
|
974 DEFSUBR (Fgetenv);
|
|
0
|
975 }
|
|
|
976
|
|
|
977 void
|
|
|
978 vars_of_callproc (void)
|
|
|
979 {
|
|
|
980 /* This function can GC */
|
|
|
981 #ifdef DOS_NT
|
|
|
982 DEFVAR_LISP ("binary-process-input", &Vbinary_process_input /*
|
|
|
983 *If non-nil then new subprocesses are assumed to take binary input.
|
|
|
984 */ );
|
|
|
985 Vbinary_process_input = Qnil;
|
|
|
986
|
|
|
987 DEFVAR_LISP ("binary-process-output", &Vbinary_process_output /*
|
|
|
988 *If non-nil then new subprocesses are assumed to produce binary output.
|
|
|
989 */ );
|
|
|
990 Vbinary_process_output = Qnil;
|
|
|
991 #endif /* DOS_NT */
|
|
|
992
|
|
|
993 DEFVAR_LISP ("shell-file-name", &Vshell_file_name /*
|
|
|
994 *File name to load inferior shells from.
|
|
|
995 Initialized from the SHELL environment variable.
|
|
|
996 */ );
|
|
|
997
|
|
|
998 DEFVAR_LISP ("process-environment", &Vprocess_environment /*
|
|
|
999 List of environment variables for subprocesses to inherit.
|
|
|
1000 Each element should be a string of the form ENVVARNAME=VALUE.
|
|
|
1001 The environment which Emacs inherits is placed in this variable
|
|
|
1002 when Emacs starts.
|
|
|
1003 */ );
|
|
|
1004 }
|
