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