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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. DJGPP 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_STDLIB_H
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30 #include <stdlib.h>
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31 #endif
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32 #include <string.h>
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33 #include <fcntl.h>
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34 #include <unistd.h>
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35 #include <sys/stat.h>
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36 #include <process.h>
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37
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38 /* Use ECHILD if available, otherwise use EINVAL. */
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39 #ifdef ECHILD
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40 #define PWAIT_ERROR ECHILD
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41 #else
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42 #define PWAIT_ERROR EINVAL
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43 #endif
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44
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45 static int pex_djgpp_open_read (struct pex_obj *, const char *, int);
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46 static int pex_djgpp_open_write (struct pex_obj *, const char *, int);
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47 static pid_t pex_djgpp_exec_child (struct pex_obj *, int, const char *,
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48 char * const *, char * const *,
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49 int, int, int, int,
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50 const char **, int *);
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51 static int pex_djgpp_close (struct pex_obj *, int);
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52 static int pex_djgpp_wait (struct pex_obj *, pid_t, int *, struct pex_time *,
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53 int, const char **, int *);
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54
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55 /* The list of functions we pass to the common routines. */
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56
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57 const struct pex_funcs funcs =
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58 {
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59 pex_djgpp_open_read,
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60 pex_djgpp_open_write,
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61 pex_djgpp_exec_child,
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62 pex_djgpp_close,
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63 pex_djgpp_wait,
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64 NULL, /* pipe */
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65 NULL, /* fdopenr */
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66 NULL, /* fdopenw */
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67 NULL /* cleanup */
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68 };
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69
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70 /* Return a newly initialized pex_obj structure. */
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71
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72 struct pex_obj *
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73 pex_init (int flags, const char *pname, const char *tempbase)
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74 {
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75 /* DJGPP does not support pipes. */
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76 flags &= ~ PEX_USE_PIPES;
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77 return pex_init_common (flags, pname, tempbase, &funcs);
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78 }
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79
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80 /* Open a file for reading. */
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81
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82 static int
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83 pex_djgpp_open_read (struct pex_obj *obj ATTRIBUTE_UNUSED,
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84 const char *name, int binary)
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85 {
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86 return open (name, O_RDONLY | (binary ? O_BINARY : O_TEXT));
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87 }
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88
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89 /* Open a file for writing. */
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90
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91 static int
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92 pex_djgpp_open_write (struct pex_obj *obj ATTRIBUTE_UNUSED,
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93 const char *name, int binary)
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94 {
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95 /* Note that we can't use O_EXCL here because gcc may have already
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96 created the temporary file via make_temp_file. */
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97 return open (name,
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98 (O_WRONLY | O_CREAT | O_TRUNC
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99 | (binary ? O_BINARY : O_TEXT)),
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100 S_IRUSR | S_IWUSR);
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101 }
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102
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103 /* Close a file. */
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104
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105 static int
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106 pex_djgpp_close (struct pex_obj *obj ATTRIBUTE_UNUSED, int fd)
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107 {
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108 return close (fd);
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109 }
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110
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111 /* Execute a child. */
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112
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113 static pid_t
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114 pex_djgpp_exec_child (struct pex_obj *obj, int flags, const char *executable,
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115 char * const * argv, char * const * env,
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116 int in, int out, int errdes,
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117 int toclose ATTRIBUTE_UNUSED, const char **errmsg,
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118 int *err)
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119 {
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120 int org_in, org_out, org_errdes;
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121 int status;
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122 int *statuses;
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123
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124 org_in = -1;
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125 org_out = -1;
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126 org_errdes = -1;
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127
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128 if (in != STDIN_FILE_NO)
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129 {
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130 org_in = dup (STDIN_FILE_NO);
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131 if (org_in < 0)
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132 {
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133 *err = errno;
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134 *errmsg = "dup";
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135 return (pid_t) -1;
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136 }
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137 if (dup2 (in, STDIN_FILE_NO) < 0)
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138 {
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139 *err = errno;
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140 *errmsg = "dup2";
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141 return (pid_t) -1;
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142 }
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143 if (close (in) < 0)
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144 {
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145 *err = errno;
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146 *errmsg = "close";
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147 return (pid_t) -1;
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148 }
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149 }
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150
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151 if (out != STDOUT_FILE_NO)
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152 {
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153 org_out = dup (STDOUT_FILE_NO);
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154 if (org_out < 0)
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155 {
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156 *err = errno;
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157 *errmsg = "dup";
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158 return (pid_t) -1;
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159 }
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160 if (dup2 (out, STDOUT_FILE_NO) < 0)
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161 {
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162 *err = errno;
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163 *errmsg = "dup2";
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164 return (pid_t) -1;
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165 }
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166 if (close (out) < 0)
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167 {
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168 *err = errno;
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169 *errmsg = "close";
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170 return (pid_t) -1;
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171 }
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172 }
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173
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174 if (errdes != STDERR_FILE_NO
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175 || (flags & PEX_STDERR_TO_STDOUT) != 0)
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176 {
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177 org_errdes = dup (STDERR_FILE_NO);
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178 if (org_errdes < 0)
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179 {
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180 *err = errno;
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181 *errmsg = "dup";
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182 return (pid_t) -1;
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183 }
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184 if (dup2 ((flags & PEX_STDERR_TO_STDOUT) != 0 ? STDOUT_FILE_NO : errdes,
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185 STDERR_FILE_NO) < 0)
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186 {
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187 *err = errno;
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188 *errmsg = "dup2";
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189 return (pid_t) -1;
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190 }
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191 if (errdes != STDERR_FILE_NO)
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192 {
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193 if (close (errdes) < 0)
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194 {
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195 *err = errno;
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196 *errmsg = "close";
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197 return (pid_t) -1;
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198 }
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199 }
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200 }
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201
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202 if (env)
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203 status = (((flags & PEX_SEARCH) != 0 ? spawnvpe : spawnve)
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204 (P_WAIT, executable, argv, env));
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205 else
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206 status = (((flags & PEX_SEARCH) != 0 ? spawnvp : spawnv)
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207 (P_WAIT, executable, argv));
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208
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209 if (status == -1)
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210 {
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211 *err = errno;
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212 *errmsg = ((flags & PEX_SEARCH) != 0) ? "spawnvp" : "spawnv";
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213 }
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214
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215 if (in != STDIN_FILE_NO)
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216 {
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217 if (dup2 (org_in, STDIN_FILE_NO) < 0)
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218 {
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219 *err = errno;
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220 *errmsg = "dup2";
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221 return (pid_t) -1;
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222 }
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223 if (close (org_in) < 0)
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224 {
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225 *err = errno;
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226 *errmsg = "close";
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227 return (pid_t) -1;
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228 }
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229 }
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230
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231 if (out != STDOUT_FILE_NO)
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232 {
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233 if (dup2 (org_out, STDOUT_FILE_NO) < 0)
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234 {
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235 *err = errno;
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236 *errmsg = "dup2";
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237 return (pid_t) -1;
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238 }
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239 if (close (org_out) < 0)
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240 {
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241 *err = errno;
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242 *errmsg = "close";
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243 return (pid_t) -1;
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244 }
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245 }
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246
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247 if (errdes != STDERR_FILE_NO
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248 || (flags & PEX_STDERR_TO_STDOUT) != 0)
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249 {
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250 if (dup2 (org_errdes, STDERR_FILE_NO) < 0)
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251 {
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252 *err = errno;
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253 *errmsg = "dup2";
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254 return (pid_t) -1;
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255 }
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256 if (close (org_errdes) < 0)
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257 {
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258 *err = errno;
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259 *errmsg = "close";
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260 return (pid_t) -1;
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261 }
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262 }
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263
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264 /* Save the exit status for later. When we are called, obj->count
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265 is the number of children which have executed before this
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266 one. */
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267 statuses = (int *) obj->sysdep;
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268 statuses = XRESIZEVEC (int, statuses, obj->count + 1);
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269 statuses[obj->count] = status;
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270 obj->sysdep = (void *) statuses;
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271
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272 return (pid_t) obj->count;
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273 }
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274
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275 /* Wait for a child process to complete. Actually the child process
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276 has already completed, and we just need to return the exit
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277 status. */
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278
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279 static int
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280 pex_djgpp_wait (struct pex_obj *obj, pid_t pid, int *status,
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281 struct pex_time *time, int done ATTRIBUTE_UNUSED,
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282 const char **errmsg ATTRIBUTE_UNUSED,
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283 int *err ATTRIBUTE_UNUSED)
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284 {
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285 int *statuses;
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286
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287 if (time != NULL)
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288 memset (time, 0, sizeof *time);
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289
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290 statuses = (int *) obj->sysdep;
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291 *status = statuses[pid];
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292
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293 return 0;
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294 }
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