1 | /**********************************************************************
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2 | *
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3 | * os_process_windows.c -- Windows version of osprocess. See os_process.h
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4 | * for more details
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5 | *
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6 | * Copyright (C) 2010 The New Zealand Digital Library Project
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7 | *
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8 | * A component of the Greenstone digital library software
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9 | * from the New Zealand Digital Library Project at the
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10 | * University of Waikato, New Zealand.
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11 | *
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12 | * This program is free software; you can redistribute it and/or modify
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13 | * it under the terms of the GNU General Public License as published by
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14 | * the Free Software Foundation; either version 2 of the License, or
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15 | * (at your option) any later version.
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16 | *
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17 | * This program is distributed in the hope that it will be useful,
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18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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20 | * GNU General Public License for more details.
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21 | *
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22 | * You should have received a copy of the GNU General Public License
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23 | * along with this program; if not, write to the Free Software
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24 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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25 | *
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26 | *********************************************************************/
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27 |
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28 | #ifdef __WIN32__
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29 |
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30 | #if defined(GSDL_USE_OBJECTSPACE)
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31 | # include <ospace/std/iostream>
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32 | #elif defined(GSDL_USE_IOS_H)
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33 | # include <iostream.h>
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34 | #else
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35 | # include <iostream>
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36 | using namespace std;
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37 | #endif
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38 |
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39 | #include "text_t.h"
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40 | #include "os_process_windows.h"
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41 |
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42 |
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43 | osprocesswindows::osprocesswindows(OSProcessPipeMode mode,
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44 | char* prog_name, char* argv[],
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45 | char* envp[])
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46 | : child_stdout_read_(NULL), child_stdin_write_(NULL),
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47 | osprocess(mode,prog_name,argv,envp)
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48 | {
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49 | HANDLE child_stdin_read = NULL;
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50 | HANDLE child_stdout_write = NULL;
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51 |
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52 | SECURITY_ATTRIBUTES saAttr;
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53 | saAttr.nLength = sizeof(SECURITY_ATTRIBUTES);
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54 | saAttr.bInheritHandle = TRUE;
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55 | saAttr.lpSecurityDescriptor = NULL;
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56 |
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57 | // Create a pipe for the child process's STDOUT.
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58 | if (!CreatePipe(&child_stdout_read_, &child_stdout_write, &saAttr, 0)) {
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59 | cerr << "osprocesswindows::osprocesswindows(): Failed to create stdout pipe for child process" << endl;
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60 | }
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61 |
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62 | // Ensure the read handle to the pipe for STDOUT is not inherited.
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63 | if (!SetHandleInformation(child_stdout_read_, HANDLE_FLAG_INHERIT, 0)) {
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64 | cerr << "osprocesswindows::osprocesswindows(): Failed to set handle information for stdout pipe for child process" << endl;
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65 | }
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66 |
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67 | // Create a pipe for the child process's STDIN.
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68 | if (!CreatePipe(&child_stdin_read, &child_stdin_write_, &saAttr, 0)) {
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69 | cerr << "osprocesswindows::osprocesswindows(): Failed to create stdin pipe for child process" << endl;
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70 | }
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71 |
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72 | // Ensure the write handle to the pipe for STDIN is not inherited.
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73 | if (!SetHandleInformation(child_stdin_write_, HANDLE_FLAG_INHERIT, 0)) {
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74 | cerr << "osprocesswindows::osprocesswindows(): Failed to set handle information for stdin pipe for child process" << endl;
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75 | }
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76 |
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77 | STARTUPINFOA si;
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78 | memset(&si, 0, sizeof(si));
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79 | memset(&pi_, 0, sizeof(pi_));
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80 |
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81 | si.cb = sizeof(si);
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82 |
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83 | // These two lines help prevent a DOS window popping up
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84 | // when the process is created
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85 | si.dwFlags |= STARTF_USESHOWWINDOW;
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86 | si.wShowWindow = SW_HIDE;
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87 |
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88 | si.dwFlags |= STARTF_USESTDHANDLES;
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89 |
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90 |
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91 | // any error messages in the child process goes to same place as parent
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92 | // e.g. in the case of running as a CGI script, the Web server error log
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93 | si.hStdError = GetStdHandle(STD_ERROR_HANDLE);
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94 |
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95 | if ((mode==uniRead) || (mode==biReadWrite)) {
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96 | // Output from the child process comes to the parent process, down the
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97 | // OUT pipe
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98 | si.hStdOutput = child_stdout_write;
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99 | }
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100 | else {
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101 | // uniWrite
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102 | // Output from the chlid process goes to the same place as parent
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103 | si.hStdOutput = GetStdHandle(STD_OUTPUT_HANDLE);
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104 | }
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105 |
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106 | if ((mode==uniWrite) || (mode==biReadWrite)) {
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107 | // Input to the child process can be sent from the parent process, down the
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108 | // In pipe
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109 | si.hStdInput = child_stdin_read;
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110 | }
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111 | else {
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112 | // uniRead
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113 |
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114 | // Input to the child process comes from same place as parent ?!?
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115 | si.hStdInput = GetStdHandle(STD_INPUT_HANDLE);
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116 | }
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117 |
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118 | text_t cmd_line = prog_name;
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119 | if (argv != NULL) {
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120 | int i=1;
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121 | while (argv[i] != NULL) {
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122 | cmd_line += " \"";
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123 | cmd_line += argv[i];
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124 | cmd_line += "\"";
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125 | i++;
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126 | }
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127 | }
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128 |
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129 | char* cmd_line_cstr = cmd_line.getcstr();
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130 |
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131 | int rv = CreateProcess(NULL, // no application name
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132 | cmd_line_cstr,
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133 | NULL,
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134 | NULL, // no process or thread security attribues
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135 | TRUE, // Inherit handles
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136 | 0, // Creation flag
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137 | NULL, // No environment block
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138 | ".", // current working directory
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139 | &si,
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140 | &pi_); // process info filled out as a result
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141 |
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142 | delete [] cmd_line_cstr;
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143 |
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144 | if (!rv) {
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145 | cerr << "os_process_windows(): Error creating child process" << endl;
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146 | }
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147 |
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148 | // close the handles that aren't used by the parent process
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149 |
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150 | if (!CloseHandle(child_stdout_write)) {
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151 | cerr << "os_process_windows(): Error closing child's StdOut Write Handle" << endl;
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152 | }
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153 |
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154 | if (!CloseHandle(child_stdin_read)) {
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155 | cerr << "os_process_windows(): Error closing child's StdIn Read Handle" << endl;
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156 | }
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157 | }
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158 |
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159 |
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160 | osprocesswindows::~osprocesswindows()
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161 | {
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162 | // close any file handles that are still open
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163 | close();
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164 |
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165 | // Close process and thread handles
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166 | CloseHandle( pi_.hProcess );
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167 | pi_.hProcess = NULL;
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168 |
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169 | CloseHandle( pi_.hThread );
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170 | pi_.hThread = NULL;
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171 | }
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172 |
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173 |
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174 |
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175 | int osprocesswindows::write(char* buffer, const int buffer_len)
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176 | {
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177 | DWORD actual_write_len;
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178 |
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179 | bool write_ok
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180 | = WriteFile(child_stdin_write_, buffer, buffer_len, &actual_write_len, NULL);
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181 | if (!write_ok) {
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182 | cerr << "osproesswindows::write() Error: failed to write data" << endl;
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183 | }
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184 | return actual_write_len;
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185 | }
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186 |
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187 |
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188 | int osprocesswindows::read(char* buffer, const int buffer_len)
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189 | {
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190 | DWORD actual_read_len;
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191 |
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192 | bool read_ok
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193 | = ReadFile(child_stdout_read_, buffer, buffer_len, &actual_read_len, NULL);
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194 | if (!read_ok) {
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195 | cerr << "osproesswindows::read() Error: failed to read data" << endl;
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196 | }
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197 |
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198 | return actual_read_len;
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199 | }
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200 |
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201 |
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202 | void osprocesswindows::wait()
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203 | {
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204 | WaitForSingleObject(pi_.hProcess, INFINITE);
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205 | }
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206 |
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207 |
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208 | bool osprocesswindows::close_write_pipe(OSProcessWarnStatus warn_status)
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209 | {
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210 | bool write_close_ok = true;
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211 |
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212 | if (child_stdin_write_ != NULL) {
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213 |
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214 | write_close_ok = CloseHandle(child_stdin_write_);
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215 |
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216 | if (write_close_ok) {
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217 | child_stdin_write_ = NULL;
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218 | }
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219 | else {
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220 | // not OK
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221 | cerr << "osprocesswindows::close(): Error - Failed to close stdin write handle on pipe to child process" << endl;
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222 | }
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223 | }
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224 | else if (warn_status == withWarning) {
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225 | cerr << "osprocesswindows::close_write_pipe(): Warning - Tried to close already closed pipe" << endl;
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226 | }
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227 |
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228 | return write_close_ok;
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229 | }
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230 |
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231 |
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232 | bool osprocesswindows::close_read_pipe(OSProcessWarnStatus warn_status)
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233 | {
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234 | bool read_close_ok = true;
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235 |
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236 | if (child_stdout_read_ != NULL) {
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237 |
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238 | read_close_ok = CloseHandle(child_stdout_read_);
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239 |
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240 | if (read_close_ok) {
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241 | child_stdout_read_ = NULL;
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242 | }
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243 | else {
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244 | cerr << "osprocesswindows::close(): Error - Failed to close handle stdout read on pipe to chlild process" << endl;
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245 | }
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246 | }
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247 | else if (warn_status == withWarning) {
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248 | cerr << "osprocesswindows::close_read_pipe(): Warning - Tried to close already closed pipe" << endl;
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249 | }
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250 |
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251 | return read_close_ok;
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252 | }
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253 |
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254 |
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255 |
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256 |
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257 |
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258 |
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259 |
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260 |
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261 | #endif
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