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