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. DJGPP specialization. |
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3 | Copyright (C) 1996-2017 Free Software Foundation, Inc. |
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4 | |
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5 | This file is part of the libiberty library. |
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6 | Libiberty is free software; you can redistribute it and/or |
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7 | modify it under the terms of the GNU Library General Public |
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8 | License as published by the Free Software Foundation; either |
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9 | version 2 of the License, or (at your option) any later version. |
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10 | |
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11 | Libiberty is distributed in the hope that it will be useful, |
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12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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14 | Library General Public License for more details. |
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15 | |
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16 | You should have received a copy of the GNU Library General Public |
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17 | License along with libiberty; see the file COPYING.LIB. If not, |
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18 | write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor, |
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19 | Boston, MA 02110-1301, USA. */ |
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20 | |
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21 | #include "pex-common.h" |
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22 | |
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23 | #include <stdio.h> |
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24 | #include <errno.h> |
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25 | #ifdef NEED_DECLARATION_ERRNO |
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26 | extern int errno; |
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27 | #endif |
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28 | #ifdef HAVE_STDLIB_H |
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29 | #include <stdlib.h> |
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30 | #endif |
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31 | #include <string.h> |
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32 | #include <fcntl.h> |
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33 | #include <unistd.h> |
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34 | #include <sys/stat.h> |
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35 | #include <process.h> |
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36 | |
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37 | /* Use ECHILD if available, otherwise use EINVAL. */ |
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38 | #ifdef ECHILD |
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39 | #define PWAIT_ERROR ECHILD |
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40 | #else |
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41 | #define PWAIT_ERROR EINVAL |
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42 | #endif |
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43 | |
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44 | static int pex_djgpp_open_read (struct pex_obj *, const char *, int); |
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45 | static int pex_djgpp_open_write (struct pex_obj *, const char *, int, int); |
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46 | static pid_t pex_djgpp_exec_child (struct pex_obj *, int, const char *, |
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47 | char * const *, char * const *, |
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48 | int, int, int, int, |
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49 | const char **, int *); |
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50 | static int pex_djgpp_close (struct pex_obj *, int); |
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51 | static pid_t pex_djgpp_wait (struct pex_obj *, pid_t, int *, struct pex_time *, |
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52 | int, const char **, int *); |
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53 | |
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54 | /* The list of functions we pass to the common routines. */ |
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55 | |
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56 | const struct pex_funcs funcs = |
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57 | { |
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58 | pex_djgpp_open_read, |
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59 | pex_djgpp_open_write, |
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60 | pex_djgpp_exec_child, |
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61 | pex_djgpp_close, |
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62 | pex_djgpp_wait, |
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63 | NULL, /* pipe */ |
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64 | NULL, /* fdopenr */ |
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65 | NULL, /* fdopenw */ |
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66 | NULL /* cleanup */ |
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67 | }; |
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68 | |
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69 | /* Return a newly initialized pex_obj structure. */ |
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70 | |
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71 | struct pex_obj * |
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72 | pex_init (int flags, const char *pname, const char *tempbase) |
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73 | { |
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74 | /* DJGPP does not support pipes. */ |
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75 | flags &= ~ PEX_USE_PIPES; |
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76 | return pex_init_common (flags, pname, tempbase, &funcs); |
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77 | } |
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78 | |
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79 | /* Open a file for reading. */ |
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80 | |
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81 | static int |
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82 | pex_djgpp_open_read (struct pex_obj *obj ATTRIBUTE_UNUSED, |
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83 | const char *name, int binary) |
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84 | { |
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85 | return open (name, O_RDONLY | (binary ? O_BINARY : O_TEXT)); |
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86 | } |
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87 | |
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88 | /* Open a file for writing. */ |
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89 | |
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90 | static int |
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91 | pex_djgpp_open_write (struct pex_obj *obj ATTRIBUTE_UNUSED, |
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92 | const char *name, int binary, int append) |
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93 | { |
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94 | /* Note that we can't use O_EXCL here because gcc may have already |
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95 | created the temporary file via make_temp_file. */ |
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96 | if (append) |
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97 | return -1; |
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98 | return open (name, |
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99 | (O_WRONLY | O_CREAT | O_TRUNC |
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100 | | (binary ? O_BINARY : O_TEXT)), |
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101 | S_IRUSR | S_IWUSR); |
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102 | } |
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103 | |
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104 | /* Close a file. */ |
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105 | |
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106 | static int |
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107 | pex_djgpp_close (struct pex_obj *obj ATTRIBUTE_UNUSED, int fd) |
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108 | { |
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109 | return close (fd); |
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110 | } |
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111 | |
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112 | /* Execute a child. */ |
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113 | |
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114 | static pid_t |
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115 | pex_djgpp_exec_child (struct pex_obj *obj, int flags, const char *executable, |
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116 | char * const * argv, char * const * env, |
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117 | int in, int out, int errdes, |
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118 | int toclose ATTRIBUTE_UNUSED, const char **errmsg, |
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119 | int *err) |
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120 | { |
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121 | int org_in, org_out, org_errdes; |
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122 | int status; |
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123 | int *statuses; |
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124 | |
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125 | org_in = -1; |
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126 | org_out = -1; |
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127 | org_errdes = -1; |
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128 | |
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129 | if (in != STDIN_FILE_NO) |
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130 | { |
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131 | org_in = dup (STDIN_FILE_NO); |
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132 | if (org_in < 0) |
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133 | { |
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134 | *err = errno; |
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135 | *errmsg = "dup"; |
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136 | return (pid_t) -1; |
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137 | } |
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138 | if (dup2 (in, STDIN_FILE_NO) < 0) |
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139 | { |
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140 | *err = errno; |
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141 | *errmsg = "dup2"; |
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142 | return (pid_t) -1; |
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143 | } |
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144 | if (close (in) < 0) |
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145 | { |
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146 | *err = errno; |
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147 | *errmsg = "close"; |
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148 | return (pid_t) -1; |
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149 | } |
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150 | } |
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151 | |
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152 | if (out != STDOUT_FILE_NO) |
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153 | { |
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154 | org_out = dup (STDOUT_FILE_NO); |
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155 | if (org_out < 0) |
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156 | { |
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157 | *err = errno; |
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158 | *errmsg = "dup"; |
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159 | return (pid_t) -1; |
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160 | } |
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161 | if (dup2 (out, STDOUT_FILE_NO) < 0) |
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162 | { |
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163 | *err = errno; |
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164 | *errmsg = "dup2"; |
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165 | return (pid_t) -1; |
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166 | } |
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167 | if (close (out) < 0) |
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168 | { |
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169 | *err = errno; |
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170 | *errmsg = "close"; |
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171 | return (pid_t) -1; |
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172 | } |
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173 | } |
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174 | |
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175 | if (errdes != STDERR_FILE_NO |
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176 | || (flags & PEX_STDERR_TO_STDOUT) != 0) |
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177 | { |
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178 | org_errdes = dup (STDERR_FILE_NO); |
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179 | if (org_errdes < 0) |
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180 | { |
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181 | *err = errno; |
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182 | *errmsg = "dup"; |
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183 | return (pid_t) -1; |
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184 | } |
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185 | if (dup2 ((flags & PEX_STDERR_TO_STDOUT) != 0 ? STDOUT_FILE_NO : errdes, |
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186 | STDERR_FILE_NO) < 0) |
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187 | { |
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188 | *err = errno; |
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189 | *errmsg = "dup2"; |
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190 | return (pid_t) -1; |
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191 | } |
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192 | if (errdes != STDERR_FILE_NO) |
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193 | { |
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194 | if (close (errdes) < 0) |
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195 | { |
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196 | *err = errno; |
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197 | *errmsg = "close"; |
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198 | return (pid_t) -1; |
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199 | } |
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200 | } |
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201 | } |
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202 | |
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203 | if (env) |
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204 | status = (((flags & PEX_SEARCH) != 0 ? spawnvpe : spawnve) |
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205 | (P_WAIT, executable, argv, env)); |
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206 | else |
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207 | status = (((flags & PEX_SEARCH) != 0 ? spawnvp : spawnv) |
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208 | (P_WAIT, executable, argv)); |
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209 | |
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210 | if (status == -1) |
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211 | { |
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212 | *err = errno; |
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213 | *errmsg = ((flags & PEX_SEARCH) != 0) ? "spawnvp" : "spawnv"; |
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214 | } |
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215 | |
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216 | if (in != STDIN_FILE_NO) |
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217 | { |
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218 | if (dup2 (org_in, STDIN_FILE_NO) < 0) |
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219 | { |
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220 | *err = errno; |
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221 | *errmsg = "dup2"; |
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222 | return (pid_t) -1; |
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223 | } |
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224 | if (close (org_in) < 0) |
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225 | { |
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226 | *err = errno; |
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227 | *errmsg = "close"; |
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228 | return (pid_t) -1; |
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229 | } |
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230 | } |
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231 | |
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232 | if (out != STDOUT_FILE_NO) |
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233 | { |
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234 | if (dup2 (org_out, STDOUT_FILE_NO) < 0) |
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235 | { |
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236 | *err = errno; |
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237 | *errmsg = "dup2"; |
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238 | return (pid_t) -1; |
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239 | } |
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240 | if (close (org_out) < 0) |
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241 | { |
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242 | *err = errno; |
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243 | *errmsg = "close"; |
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244 | return (pid_t) -1; |
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245 | } |
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246 | } |
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247 | |
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248 | if (errdes != STDERR_FILE_NO |
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249 | || (flags & PEX_STDERR_TO_STDOUT) != 0) |
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250 | { |
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251 | if (dup2 (org_errdes, STDERR_FILE_NO) < 0) |
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252 | { |
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253 | *err = errno; |
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254 | *errmsg = "dup2"; |
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255 | return (pid_t) -1; |
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256 | } |
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257 | if (close (org_errdes) < 0) |
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258 | { |
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259 | *err = errno; |
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260 | *errmsg = "close"; |
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261 | return (pid_t) -1; |
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262 | } |
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263 | } |
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264 | |
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265 | /* Save the exit status for later. When we are called, obj->count |
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266 | is the number of children which have executed before this |
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267 | one. */ |
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268 | statuses = (int *) obj->sysdep; |
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269 | statuses = XRESIZEVEC (int, statuses, obj->count + 1); |
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270 | statuses[obj->count] = status; |
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271 | obj->sysdep = (void *) statuses; |
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272 | |
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273 | return (pid_t) obj->count; |
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274 | } |
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275 | |
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276 | /* Wait for a child process to complete. Actually the child process |
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277 | has already completed, and we just need to return the exit |
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278 | status. */ |
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279 | |
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280 | static pid_t |
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281 | pex_djgpp_wait (struct pex_obj *obj, pid_t pid, int *status, |
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282 | struct pex_time *time, int done ATTRIBUTE_UNUSED, |
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283 | const char **errmsg ATTRIBUTE_UNUSED, |
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284 | int *err ATTRIBUTE_UNUSED) |
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285 | { |
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286 | int *statuses; |
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287 | |
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288 | if (time != NULL) |
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289 | memset (time, 0, sizeof *time); |
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290 | |
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291 | statuses = (int *) obj->sysdep; |
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292 | *status = statuses[pid]; |
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293 | |
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294 | return 0; |
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295 | } |
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