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1 /* Utilities to execute a program in a subprocess (possibly linked by pipes
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2 with other subprocesses), and wait for it. Generic MSDOS specialization.
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3 Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2005
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4 Free Software Foundation, Inc.
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5
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6 This file is part of the libiberty library.
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7 Libiberty is free software; you can redistribute it and/or
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8 modify it under the terms of the GNU Library General Public
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9 License as published by the Free Software Foundation; either
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10 version 2 of the License, or (at your option) any later version.
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11
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12 Libiberty is distributed in the hope that it will be useful,
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13 but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 Library General Public License for more details.
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16
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17 You should have received a copy of the GNU Library General Public
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18 License along with libiberty; see the file COPYING.LIB. If not,
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19 write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
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20 Boston, MA 02110-1301, USA. */
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21
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22 #include "pex-common.h"
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23
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24 #include <stdio.h>
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25 #include <errno.h>
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26 #ifdef NEED_DECLARATION_ERRNO
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27 extern int errno;
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28 #endif
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29 #ifdef HAVE_STRING_H
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30 #include <string.h>
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31 #endif
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32 #ifdef HAVE_STDLIB_H
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33 #include <stdlib.h>
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34 #endif
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35
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36 #include "safe-ctype.h"
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37 #include <process.h>
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38
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39 /* The structure we keep in obj->sysdep. */
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40
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41 #define PEX_MSDOS_FILE_COUNT 3
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42
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43 #define PEX_MSDOS_FD_OFFSET 10
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44
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45 struct pex_msdos
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46 {
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47 /* An array of file names. We refer to these using file descriptors
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48 of 10 + array index. */
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49 const char *files[PEX_MSDOS_FILE_COUNT];
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50 /* Exit statuses of programs which have been run. */
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51 int *statuses;
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52 };
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53
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54 static int pex_msdos_open (struct pex_obj *, const char *, int);
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55 static int pex_msdos_open (struct pex_obj *, const char *, int);
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56 static int pex_msdos_fdindex (struct pex_msdos *, int);
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57 static pid_t pex_msdos_exec_child (struct pex_obj *, int, const char *,
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58 char * const *, char * const *,
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59 int, int, int, int,
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60 int, const char **, int *);
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61 static int pex_msdos_close (struct pex_obj *, int);
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62 static int pex_msdos_wait (struct pex_obj *, pid_t, int *, struct pex_time *,
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63 int, const char **, int *);
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64 static void pex_msdos_cleanup (struct pex_obj *);
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65
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66 /* The list of functions we pass to the common routines. */
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67
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68 const struct pex_funcs funcs =
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69 {
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70 pex_msdos_open,
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71 pex_msdos_open,
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72 pex_msdos_exec_child,
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73 pex_msdos_close,
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74 pex_msdos_wait,
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75 NULL, /* pipe */
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76 NULL, /* fdopenr */
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77 NULL, /* fdopenw */
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78 pex_msdos_cleanup
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79 };
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80
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81 /* Return a newly initialized pex_obj structure. */
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82
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83 struct pex_obj *
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84 pex_init (int flags, const char *pname, const char *tempbase)
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85 {
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86 struct pex_obj *ret;
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87 int i;
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88
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89 /* MSDOS does not support pipes. */
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90 flags &= ~ PEX_USE_PIPES;
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91
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92 ret = pex_init_common (flags, pname, tempbase, funcs);
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93
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94 ret->sysdep = XNEW (struct pex_msdos);
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95 for (i = 0; i < PEX_MSDOS_FILE_COUNT; ++i)
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96 ret->files[i] = NULL;
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97 ret->statuses = NULL;
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98
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99 return ret;
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100 }
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101
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102 /* Open a file. FIXME: We ignore the binary argument, since we have
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103 no way to handle it. */
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104
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105 static int
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106 pex_msdos_open (struct pex_obj *obj, const char *name,
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107 int binary ATTRIBUTE_UNUSED)
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108 {
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109 struct pex_msdos *ms;
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110 int i;
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111
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112 ms = (struct pex_msdos *) obj->sysdep;
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113
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114 for (i = 0; i < PEX_MSDOS_FILE_COUNT; ++i)
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115 {
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116 if (ms->files[i] == NULL)
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117 {
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118 ms->files[i] = xstrdup (name);
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119 return i + PEX_MSDOS_FD_OFFSET;
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120 }
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121 }
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122
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123 abort ();
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124 }
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125
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126 /* Get the index into msdos->files associated with an open file
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127 descriptor. */
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128
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129 static int
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130 pex_msdos_fdindex (struct pex_msdos *ms, int fd)
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131 {
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132 fd -= PEX_MSDOS_FD_OFFSET;
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133 if (fd < 0 || fd >= PEX_MSDOS_FILE_COUNT || ms->files[fd] == NULL)
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134 abort ();
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135 return fd;
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136 }
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137
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138
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139 /* Close a file. */
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140
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141 static int
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142 pex_msdos_close (struct pex_obj *obj, int fd)
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143 {
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144 struct pex_msdos *ms;
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145 int fdinex;
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146
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147 ms = (struct pex_msdos *) obj->sysdep;
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148 fdindex = pe_msdos_fdindex (ms, fd);
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149 free (ms->files[fdindex]);
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150 ms->files[fdindex] = NULL;
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151 }
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152
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153 /* Execute a child. */
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154
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155 static pid_t
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156 pex_msdos_exec_child (struct pex_obj *obj, int flags, const char *executable,
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157 char * const * argv, char * const * env, int in, int out,
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158 int toclose ATTRIBUTE_UNUSED,
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159 int errdes ATTRIBUTE_UNUSED, const char **errmsg,
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160 int *err)
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161 {
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162 struct pex_msdos *ms;
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163 char *temp_base;
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164 int temp_base_allocated;
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165 char *rf;
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166 int inindex;
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167 char *infile;
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168 int outindex;
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169 char *outfile;
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170 char *scmd;
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171 FILE *argfile;
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172 int i;
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173 int status;
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174
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175 ms = (struct pex_msdos *) obj->sysdep;
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176
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177 /* FIXME: I don't know how to redirect stderr, so we ignore ERRDES
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178 and PEX_STDERR_TO_STDOUT. */
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179
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180 temp_base = obj->temp_base;
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181 if (temp_base != NULL)
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182 temp_base_allocated = 0;
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183 else
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184 {
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185 temp_base = choose_temp_base ();
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186 temp_base_allocated = 1;
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187 }
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188
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189 rf = concat (temp_base, ".gp", NULL);
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190
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191 if (temp_base_allocated)
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192 free (temp_base);
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193
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194 if (in == STDIN_FILE_NO)
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195 {
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196 inindex = -1;
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197 infile = "";
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198 }
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199 else
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200 {
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201 inindex = pex_msdos_fdindex (ms, in);
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202 infile = ms->files[inindex];
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203 }
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204
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205 if (out == STDOUT_FILE_NO)
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206 {
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207 outindex = -1;
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208 outfile = "";
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209 }
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210 else
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211 {
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212 outindex = pex_msdos_fdindex (ms, out);
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213 outfile = ms->files[outindex];
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214 }
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215
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216 scmd = XNEWVEC (char, strlen (program)
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217 + ((flags & PEXECUTE_SEARCH) != 0 ? 4 : 0)
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218 + strlen (rf)
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219 + strlen (infile)
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220 + strlen (outfile)
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221 + 10);
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222 sprintf (scmd, "%s%s @%s%s%s%s%s",
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223 program,
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224 (flags & PEXECUTE_SEARCH) != 0 ? ".exe" : "",
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225 rf,
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226 inindex != -1 ? " <" : "",
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227 infile,
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228 outindex != -1 ? " >" : "",
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229 outfile);
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230
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231 argfile = fopen (rf, "w");
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232 if (argfile == NULL)
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233 {
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234 *err = errno;
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235 free (scmd);
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236 free (rf);
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237 *errmsg = "cannot open temporary command file";
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238 return (pid_t) -1;
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239 }
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240
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241 for (i = 1; argv[i] != NULL; ++i)
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242 {
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243 char *p;
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244
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245 for (p = argv[i]; *p != '\0'; ++p)
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246 {
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247 if (*p == '"' || *p == '\'' || *p == '\\' || ISSPACE (*p))
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248 putc ('\\', argfile);
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249 putc (*p, argfile);
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250 }
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251 putc ('\n', argfile);
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252 }
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253
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254 fclose (argfile);
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255
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256 status = system (scmd);
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257
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258 if (status == -1)
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259 {
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260 *err = errno;
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261 remove (rf);
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262 free (scmd);
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263 free (rf);
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264 *errmsg = "system";
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265 return (pid_t) -1;
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266 }
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267
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268 remove (rf);
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269 free (scmd);
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270 free (rf);
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271
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272 /* Save the exit status for later. When we are called, obj->count
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273 is the number of children which have executed before this
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274 one. */
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275 ms->statuses = XRESIZEVEC(int, ms->statuses, obj->count + 1);
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276 ms->statuses[obj->count] = status;
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277
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278 return (pid_t) obj->count;
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279 }
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280
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281 /* Wait for a child process to complete. Actually the child process
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282 has already completed, and we just need to return the exit
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283 status. */
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284
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285 static int
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286 pex_msdos_wait (struct pex_obj *obj, pid_t pid, int *status,
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287 struct pex_time *time, int done ATTRIBUTE_UNUSED,
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288 const char **errmsg ATTRIBUTE_UNUSED,
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289 int *err ATTRIBUTE_UNUSED)
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290 {
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291 struct pex_msdos *ms;
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292
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293 ms = (struct pex_msdos *) obj->sysdep;
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294
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295 if (time != NULL)
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296 memset (time, 0, sizeof *time);
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297
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298 *status = ms->statuses[pid];
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299
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300 return 0;
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301 }
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302
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303 /* Clean up the pex_msdos structure. */
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304
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305 static void
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306 pex_msdos_cleanup (struct pex_obj *obj)
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307 {
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308 struct pex_msdos *ms;
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309 int i;
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310
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311 ms = (struct pex_msdos *) obj->sysdep;
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312 for (i = 0; i < PEX_MSDOS_FILE_COUNT; ++i)
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313 if (msdos->files[i] != NULL)
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314 free (msdos->files[i]);
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315 if (msdos->statuses != NULL)
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316 free (msdos->statuses);
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317 free (msdos);
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318 obj->sysdep = NULL;
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319 }
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