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1 /* |
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2 |
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3 Copyright (C) 1996, 1997 John W. Eaton |
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4 |
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5 This file is part of Octave. |
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6 |
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7 Octave is free software; you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation; either version 3 of the License, or (at your |
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10 option) any later version. |
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11 |
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12 Octave is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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15 for more details. |
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16 |
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17 You should have received a copy of the GNU General Public License |
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18 along with Octave; see the file COPYING. If not, see |
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19 <http://www.gnu.org/licenses/>. |
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20 |
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21 */ |
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22 |
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23 #ifdef HAVE_CONFIG_H |
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24 #include <config.h> |
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25 #endif |
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26 |
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27 #include <cerrno> |
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28 |
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29 #include <iostream> |
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30 |
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31 #ifdef HAVE_UNISTD_H |
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32 #ifdef HAVE_SYS_TYPES_H |
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33 #include <sys/types.h> |
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34 #endif |
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35 #include <unistd.h> |
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36 #endif |
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37 |
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38 #include "lo-mappers.h" |
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39 #include "lo-utils.h" |
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40 #include "oct-procbuf.h" |
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41 #include "oct-syscalls.h" |
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42 #include "sysdep.h" |
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43 #include "variables.h" |
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44 |
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45 #include "defun.h" |
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46 #include "gripes.h" |
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47 #include "utils.h" |
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48 |
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49 // This class is based on the procbuf class from libg++, written by |
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50 // Per Bothner, Copyright (C) 1993 Free Software Foundation. |
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51 |
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52 static octave_procbuf *octave_procbuf_list = 0; |
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53 |
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54 #ifndef BUFSIZ |
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55 #define BUFSIZ 1024 |
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56 #endif |
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57 |
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58 octave_procbuf * |
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59 octave_procbuf::open (const char *command, int mode) |
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60 { |
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61 #if defined (__CYGWIN__) || defined (__MINGW32__) || defined (_MSC_VER) |
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62 |
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63 if (is_open ()) |
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64 return 0; |
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65 |
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66 f = octave_popen (command, (mode & std::ios::in) ? "r" : "w"); |
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67 |
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68 if (! f) |
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69 return 0; |
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70 |
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71 // Oops... popen doesn't return the associated pid, so fake it for now |
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72 |
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73 proc_pid = 1; |
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74 |
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75 open_p = true; |
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76 |
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77 if (mode & std::ios::out) |
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78 ::setvbuf (f, 0, _IOLBF, BUFSIZ); |
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79 |
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80 return this; |
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81 |
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82 #elif defined (HAVE_SYS_WAIT_H) |
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83 |
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84 int pipe_fds[2]; |
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85 |
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86 volatile int child_std_end = (mode & std::ios::in) ? 1 : 0; |
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87 |
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88 volatile int parent_end, child_end; |
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89 |
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90 if (is_open ()) |
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91 return 0; |
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92 |
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93 if (pipe (pipe_fds) < 0) |
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94 return 0; |
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95 |
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96 if (mode & std::ios::in) |
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97 { |
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98 parent_end = pipe_fds[0]; |
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99 child_end = pipe_fds[1]; |
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100 } |
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101 else |
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102 { |
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103 parent_end = pipe_fds[1]; |
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104 child_end = pipe_fds[0]; |
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105 } |
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106 |
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107 proc_pid = ::fork (); |
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108 |
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109 if (proc_pid == 0) |
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110 { |
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111 ::close (parent_end); |
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112 |
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113 if (child_end != child_std_end) |
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114 { |
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115 ::dup2 (child_end, child_std_end); |
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116 ::close (child_end); |
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117 } |
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118 |
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119 while (octave_procbuf_list) |
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120 { |
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121 FILE *fp = octave_procbuf_list->f; |
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122 |
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123 if (fp) |
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124 { |
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125 ::fclose (fp); |
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126 fp = 0; |
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127 } |
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128 |
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129 octave_procbuf_list = octave_procbuf_list->next; |
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130 } |
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131 |
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132 execl ("/bin/sh", "sh", "-c", command, static_cast<void *> (0)); |
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133 |
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134 exit (127); |
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135 } |
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136 |
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137 ::close (child_end); |
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138 |
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139 if (proc_pid < 0) |
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140 { |
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141 ::close (parent_end); |
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142 return 0; |
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143 } |
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144 |
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145 f = ::fdopen (parent_end, (mode & std::ios::in) ? "r" : "w"); |
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146 |
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147 if (mode & std::ios::out) |
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148 ::setvbuf (f, 0, _IOLBF, BUFSIZ); |
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149 |
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150 open_p = true; |
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151 |
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152 next = octave_procbuf_list; |
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153 octave_procbuf_list = this; |
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154 |
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155 return this; |
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156 |
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157 #else |
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158 |
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159 return 0; |
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160 |
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161 #endif |
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162 } |
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163 |
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164 octave_procbuf * |
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165 octave_procbuf::close (void) |
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166 { |
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167 #if defined (__CYGWIN__) || defined (__MINGW32__) || defined (_MSC_VER) |
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168 |
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169 if (f) |
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170 { |
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171 wstatus = octave_pclose (f); |
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172 f = 0; |
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173 } |
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174 |
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175 open_p = false; |
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176 |
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177 return this; |
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178 |
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179 #elif defined (HAVE_SYS_WAIT_H) |
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180 |
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181 if (f) |
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182 { |
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183 pid_t wait_pid; |
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184 |
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185 int status = -1; |
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186 |
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187 for (octave_procbuf **ptr = &octave_procbuf_list; |
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188 *ptr != 0; |
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189 ptr = &(*ptr)->next) |
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190 { |
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191 if (*ptr == this) |
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192 { |
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193 *ptr = (*ptr)->next; |
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194 status = 0; |
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195 break; |
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196 } |
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197 } |
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198 |
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199 if (status == 0 && ::fclose (f) == 0) |
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200 { |
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201 using namespace std; |
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202 |
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203 do |
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204 { |
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205 wait_pid = octave_syscalls::waitpid (proc_pid, &wstatus, 0); |
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206 } |
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207 while (wait_pid == -1 && errno == EINTR); |
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208 } |
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209 |
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210 f = 0; |
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211 } |
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212 |
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213 open_p = false; |
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214 |
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215 return this; |
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216 |
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217 #else |
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218 |
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219 return 0; |
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220 |
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221 #endif |
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222 } |
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223 |
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224 /* |
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225 ;;; Local Variables: *** |
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226 ;;; mode: C++ *** |
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227 ;;; End: *** |
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228 */ |
