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 pid_t 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 pid_t |
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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 | free (msdos->files[i]); |
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314 | free (msdos->statuses); |
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315 | free (msdos); |
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316 | obj->sysdep = NULL; |
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317 | } |
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