1 | /**********************************************************************
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2 | *
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3 | * os_process_unix.cpp -- Unix 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 | #ifndef __WIN32__ // i.e Unix
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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 <unistd.h>
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40 |
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41 | #include "os_process_unix.h"
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42 |
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43 | #define READ_PIPE_INDEX 0
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44 | #define WRITE_PIPE_INDEX 1
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45 |
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46 | #define FD_STDIN 0
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47 | #define FD_STDOUT 1
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48 | #define FD_STDERR 2
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49 |
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50 | osprocessunix::osprocessunix(char* cmdline)
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51 | : osprocess(cmdline)
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52 | {}
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53 |
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54 | osprocessunix::osprocessunix(char* cmdline, OSProcessPipeMode mode)
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55 | : child_stdout_read_(-1), child_stdin_write_(-1),
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56 | osprocess(cmdline,mode)
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57 | {
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58 |
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59 | // Create a pipe for the child process's STDOUT.
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60 | int stdout_pipe_fd[2];
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61 |
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62 | if (pipe(stdout_pipe_fd)!=0) {
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63 | cerr << "osprocessunix::osprocessunix(): Failed to create stdout pipe for child process" << endl;
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64 | return;
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65 | }
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66 |
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67 | child_stdout_read_ = stdout_pipe_fd[READ_PIPE_INDEX];
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68 | int child_stdout_write = stdout_pipe_fd[WRITE_PIPE_INDEX];
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69 |
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70 |
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71 | // Create a pipe for the child process's STDIN.
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72 | int stdin_pipe_fd[2];
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73 |
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74 | if (pipe(stdin_pipe_fd)!=0) {
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75 | cerr << "osprocessunix::osprocessunix(): Failed to create stdin pipe for child process" << endl;
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76 | return;
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77 | }
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78 |
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79 | int child_stdin_read = stdin_pipe_fd[READ_PIPE_INDEX];
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80 | child_stdin_write_ = stdin_pipe_fd[WRITE_PIPE_INDEX];
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81 |
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82 |
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83 | pid_t pid = fork();
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84 | if (pid < 0) {
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85 | cerr << "osprocessunix::osprocessunix(): Failed to create child process" << endl;
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86 | return;
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87 | }
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88 |
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89 | if (pid == 0) {
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90 | // Child process
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91 |
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92 | // Sort out input pipe
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93 | // child has no buisness accessing write end of input pipe => close
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94 | ::close(child_stdin_write_);
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95 |
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96 | if ((mode == uniWrite) || (mode == biReadWrite)) {
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97 | // wire up child's stdin read so its input comes from the parent's pipe
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98 | dup2(child_stdin_read, FD_STDIN);
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99 | }
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100 | else {
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101 | // noPipe or (parent is doing) uniRead (which means we're not interested
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102 | // in the child reading any input from the parent)
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103 | // => child input remains coming from stdin
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104 | ::close(child_stdin_read);
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105 | }
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106 |
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107 | // Sort out output pipe
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108 | // child has no buisness accessing read end of output pipe => close
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109 | ::close(child_stdout_read_);
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110 | if ((mode == uniRead) || (mode == biReadWrite)) {
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111 | // wire up child's stdout write so it is send down the pipe to the parent
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112 | dup2(child_stdout_write, FD_STDOUT);
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113 | }
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114 | else {
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115 | // noPipe or (parent is doing) uniWrite (which means we're not interested
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116 | // in any output produced by the child process)
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117 | // => child output remains going to stdout
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118 | ::close(child_stdout_write);
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119 | }
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120 |
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121 | /*
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122 | // execve ...
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123 | int rv = CreateProcess(NULL, // no application name
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124 | cmdline,
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125 | NULL,
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126 | NULL, // no process or thread security attribues
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127 | TRUE, // Inherit handles
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128 | 0, // Creation flag
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129 | NULL, // No environment block
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130 | ".", // current working directory
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131 | &si,
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132 | &pi_); // process info filled out as a result
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133 | if (!rv) {
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134 | fprintf(stderr,"os_process_windows(): Error creating process");
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135 | }
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136 | */
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137 |
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138 |
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139 | }
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140 | else {
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141 | // Parent process
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142 |
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143 | // Sort out input pipe
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144 | // parent has no buisness accessing read end of input pipe => close
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145 | ::close(child_stdin_read);
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146 |
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147 | // Sort out output pipe
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148 | // parent has no buisness accessing write end of output pipe => close
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149 | ::close(child_stdout_write);
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150 |
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151 |
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152 | switch(mode)
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153 | {
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154 | case uniRead:
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155 | ::close(child_stdin_write_);
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156 | break;
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157 | case uniWrite:
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158 | ::close(child_stdout_read_);
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159 | break;
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160 | case biReadWrite:
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161 | // nothing to do
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162 | // the pipes are set up just the way we want them
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163 | break;
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164 | case noPipe:
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165 | ::close(child_stdin_write_);
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166 | ::close(child_stdout_read_);
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167 | break;
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168 | }
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169 | }
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170 | }
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171 |
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172 | osprocessunix::~osprocessunix()
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173 | {}
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174 |
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175 | /*
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176 | bool osprocessunix::eop()
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177 | {}
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178 |
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179 | bool osprocessunix::eop(OSProcessPipeMode)
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180 | {}
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181 | */
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182 |
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183 | int osprocessunix::write(char* buffer, const int buffer_len)
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184 | {
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185 |
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186 | int actual_write_len = ::write(child_stdin_write_, buffer, buffer_len);
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187 |
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188 | if (actual_write_len<0) {
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189 | cerr << "osproessunix::write() Error: failed to write data" << endl;
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190 | }
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191 |
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192 | return actual_write_len;
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193 | }
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194 |
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195 | int osprocessunix::read(char* buffer, const int buffer_len)
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196 | {
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197 | int actual_read_len = ::read(child_stdout_read_, buffer, buffer_len);
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198 |
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199 | if (actual_read_len<0) {
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200 | cerr << "osproessunix::read() Error: failed to read data" << endl;
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201 | }
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202 |
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203 | return actual_read_len;
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204 | }
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205 |
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206 |
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207 |
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208 | bool osprocessunix::close()
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209 | {
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210 | return true;
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211 | }
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212 |
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213 | bool osprocessunix::close(OSProcessPipeMode mode)
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214 | {
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215 | return true;
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216 | }
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217 |
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218 |
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219 |
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220 | #endif
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