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1 /* |
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2 |
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3 Copyright (C) 1996, 1997, 1998, 1999, 2000, 2002, 2003, 2005, 2006 |
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4 2007 John W. Eaton |
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5 |
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6 This file is part of Octave. |
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7 |
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8 Octave is free software; you can redistribute it and/or modify it |
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9 under the terms of the GNU General Public License as published by the |
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10 Free Software Foundation; either version 3 of the License, or (at your |
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11 option) any later version. |
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12 |
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13 Octave is distributed in the hope that it will be useful, but WITHOUT |
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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16 for more details. |
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17 |
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18 You should have received a copy of the GNU General Public License |
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19 along with Octave; see the file COPYING. If not, see |
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20 <http://www.gnu.org/licenses/>. |
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21 |
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22 */ |
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23 |
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24 #ifdef HAVE_CONFIG_H |
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25 #include <config.h> |
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26 #endif |
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27 |
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28 #include <cerrno> |
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29 |
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30 #include <iostream> |
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31 |
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32 #include <sys/types.h> |
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33 #include <unistd.h> |
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34 |
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35 #include "lo-mappers.h" |
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36 #include "lo-utils.h" |
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37 #include "oct-procbuf.h" |
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38 #include "oct-syscalls.h" |
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39 #include "sysdep.h" |
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40 #include "variables.h" |
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41 |
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42 #include "defun.h" |
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43 #include "gripes.h" |
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44 #include "utils.h" |
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45 |
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46 // This class is based on the procbuf class from libg++, written by |
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47 // Per Bothner, Copyright (C) 1993 Free Software Foundation. |
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48 |
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49 static octave_procbuf *octave_procbuf_list = 0; |
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50 |
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51 #ifndef BUFSIZ |
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52 #define BUFSIZ 1024 |
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53 #endif |
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54 |
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55 octave_procbuf * |
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56 octave_procbuf::open (const char *command, int mode) |
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57 { |
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58 #if defined (__CYGWIN__) || defined (__MINGW32__) || defined (_MSC_VER) |
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59 |
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60 if (is_open ()) |
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61 return 0; |
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62 |
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63 f = octave_popen (command, (mode & std::ios::in) ? "r" : "w"); |
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64 |
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65 if (! f) |
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66 return 0; |
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67 |
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68 // Oops... popen doesn't return the associated pid, so fake it for now |
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69 |
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70 proc_pid = 1; |
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71 |
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72 open_p = true; |
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73 |
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74 if (mode & std::ios::out) |
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75 ::setvbuf (f, 0, _IOLBF, BUFSIZ); |
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76 |
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77 return this; |
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78 |
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79 #elif defined (HAVE_SYS_WAIT_H) |
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80 |
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81 int pipe_fds[2]; |
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82 |
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83 volatile int child_std_end = (mode & std::ios::in) ? 1 : 0; |
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84 |
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85 volatile int parent_end, child_end; |
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86 |
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87 if (is_open ()) |
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88 return 0; |
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89 |
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90 if (pipe (pipe_fds) < 0) |
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91 return 0; |
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92 |
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93 if (mode & std::ios::in) |
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94 { |
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95 parent_end = pipe_fds[0]; |
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96 child_end = pipe_fds[1]; |
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97 } |
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98 else |
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99 { |
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100 parent_end = pipe_fds[1]; |
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101 child_end = pipe_fds[0]; |
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102 } |
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103 |
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104 proc_pid = ::fork (); |
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105 |
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106 if (proc_pid == 0) |
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107 { |
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108 ::close (parent_end); |
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109 |
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110 if (child_end != child_std_end) |
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111 { |
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112 ::dup2 (child_end, child_std_end); |
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113 ::close (child_end); |
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114 } |
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115 |
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116 while (octave_procbuf_list) |
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117 { |
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118 FILE *fp = octave_procbuf_list->f; |
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119 |
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120 if (fp) |
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121 { |
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122 ::fclose (fp); |
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123 fp = 0; |
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124 } |
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125 |
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126 octave_procbuf_list = octave_procbuf_list->next; |
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127 } |
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128 |
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129 execl ("/bin/sh", "sh", "-c", command, static_cast<void *> (0)); |
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130 |
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131 exit (127); |
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132 } |
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133 |
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134 ::close (child_end); |
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135 |
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136 if (proc_pid < 0) |
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137 { |
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138 ::close (parent_end); |
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139 return 0; |
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140 } |
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141 |
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142 f = ::fdopen (parent_end, (mode & std::ios::in) ? "r" : "w"); |
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143 |
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144 if (mode & std::ios::out) |
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145 ::setvbuf (f, 0, _IOLBF, BUFSIZ); |
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146 |
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147 open_p = true; |
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148 |
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149 next = octave_procbuf_list; |
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150 octave_procbuf_list = this; |
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151 |
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152 return this; |
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153 |
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154 #else |
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155 |
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156 return 0; |
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157 |
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158 #endif |
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159 } |
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160 |
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161 octave_procbuf * |
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162 octave_procbuf::close (void) |
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163 { |
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164 #if defined (__CYGWIN__) || defined (__MINGW32__) || defined (_MSC_VER) |
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165 |
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166 if (f) |
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167 { |
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168 wstatus = octave_pclose (f); |
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169 f = 0; |
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170 } |
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171 |
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172 open_p = false; |
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173 |
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174 return this; |
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175 |
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176 #elif defined (HAVE_SYS_WAIT_H) |
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177 |
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178 if (f) |
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179 { |
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180 pid_t wait_pid; |
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181 |
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182 int status = -1; |
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183 |
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184 for (octave_procbuf **ptr = &octave_procbuf_list; |
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185 *ptr != 0; |
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186 ptr = &(*ptr)->next) |
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187 { |
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188 if (*ptr == this) |
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189 { |
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190 *ptr = (*ptr)->next; |
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191 status = 0; |
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192 break; |
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193 } |
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194 } |
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195 |
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196 if (status == 0 && ::fclose (f) == 0) |
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197 { |
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198 using namespace std; |
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199 |
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200 do |
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201 { |
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202 wait_pid = octave_syscalls::waitpid (proc_pid, &wstatus, 0); |
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203 } |
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204 while (wait_pid == -1 && errno == EINTR); |
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205 } |
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206 |
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207 f = 0; |
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208 } |
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209 |
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210 open_p = false; |
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211 |
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212 return this; |
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213 |
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214 #else |
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215 |
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216 return 0; |
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217 |
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218 #endif |
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219 } |
