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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 2, or (at your option) any |
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10 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, write to the Free |
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19 Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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20 02110-1301, USA. |
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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 #ifdef HAVE_UNISTD_H |
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33 #ifdef HAVE_SYS_TYPES_H |
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34 #include <sys/types.h> |
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35 #endif |
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36 #include <unistd.h> |
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37 #endif |
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38 |
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39 #include "lo-mappers.h" |
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40 #include "lo-utils.h" |
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41 #include "oct-procbuf.h" |
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42 #include "syswait.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 // Number of microseconds to delay in the parent after forking. |
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50 static int Vkluge_procbuf_delay = 0; |
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51 |
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52 // This class is based on the procbuf class from libg++, written by |
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53 // Per Bothner, Copyright (C) 1993 Free Software Foundation. |
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54 |
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55 static octave_procbuf *octave_procbuf_list = 0; |
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56 |
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57 octave_procbuf * |
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58 octave_procbuf::open (const char *command, int mode) |
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59 { |
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60 #if defined (__CYGWIN32__) |
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61 |
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62 if (is_open ()) |
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63 return 0; |
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64 |
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65 f = popen (command, (mode & std::ios::in) ? "r" : "w"); |
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66 |
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67 if (! f) |
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68 return 0; |
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69 |
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70 // Oops... popen doesn't return the associated pid, so fake it for now |
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71 |
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72 proc_pid = 1; |
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73 |
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74 open_p = true; |
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75 |
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76 if (mode & std::ios::out) |
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77 ::setvbuf (f, 0, _IOLBF, 0); |
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78 |
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79 return this; |
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80 |
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81 #elif defined (HAVE_SYS_WAIT_H) |
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82 |
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83 int pipe_fds[2]; |
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84 |
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85 volatile int child_std_end = (mode & std::ios::in) ? 1 : 0; |
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86 |
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87 volatile int parent_end, child_end; |
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88 |
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89 if (is_open ()) |
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90 return 0; |
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91 |
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92 if (pipe (pipe_fds) < 0) |
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93 return 0; |
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94 |
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95 if (mode & std::ios::in) |
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96 { |
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97 parent_end = pipe_fds[0]; |
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98 child_end = pipe_fds[1]; |
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99 } |
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100 else |
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101 { |
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102 parent_end = pipe_fds[1]; |
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103 child_end = pipe_fds[0]; |
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104 } |
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105 |
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106 proc_pid = ::fork (); |
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107 |
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108 if (proc_pid == 0) |
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109 { |
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110 ::close (parent_end); |
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111 |
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112 if (child_end != child_std_end) |
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113 { |
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114 ::dup2 (child_end, child_std_end); |
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115 ::close (child_end); |
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116 } |
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117 |
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118 while (octave_procbuf_list) |
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119 { |
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120 FILE *fp = octave_procbuf_list->f; |
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121 |
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122 if (fp) |
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123 { |
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124 ::fclose (fp); |
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125 fp = 0; |
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126 } |
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127 |
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128 octave_procbuf_list = octave_procbuf_list->next; |
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129 } |
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130 |
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131 execl ("/bin/sh", "sh", "-c", command, 0); |
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132 |
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133 exit (127); |
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134 } |
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135 |
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136 if (Vkluge_procbuf_delay > 0) |
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137 octave_usleep (Vkluge_procbuf_delay); |
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138 |
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139 ::close (child_end); |
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140 |
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141 if (proc_pid < 0) |
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142 { |
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143 ::close (parent_end); |
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144 return 0; |
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145 } |
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146 |
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147 f = ::fdopen (parent_end, (mode & std::ios::in) ? "r" : "w"); |
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148 |
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149 if (mode & std::ios::out) |
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150 ::setvbuf (f, 0, _IOLBF, 0); |
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151 |
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152 open_p = true; |
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153 |
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154 next = octave_procbuf_list; |
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155 octave_procbuf_list = this; |
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156 |
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157 return this; |
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158 |
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159 #else |
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160 |
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161 return 0; |
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162 |
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163 #endif |
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164 } |
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165 |
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166 octave_procbuf * |
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167 octave_procbuf::close (void) |
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168 { |
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169 #if defined (__CYGWIN32__) |
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170 |
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171 if (f) |
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172 { |
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173 wstatus = ::pclose (f); |
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174 f = 0; |
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175 } |
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176 |
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177 open_p = false; |
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178 |
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179 return this; |
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180 |
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181 #elif defined (HAVE_SYS_WAIT_H) |
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182 |
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183 if (f) |
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184 { |
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185 pid_t wait_pid; |
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186 |
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187 int status = -1; |
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188 |
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189 for (octave_procbuf **ptr = &octave_procbuf_list; |
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190 *ptr != 0; |
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191 ptr = &(*ptr)->next) |
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192 { |
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193 if (*ptr == this) |
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194 { |
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195 *ptr = (*ptr)->next; |
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196 status = 0; |
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197 break; |
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198 } |
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199 } |
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200 |
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201 if (status == 0 && ::fclose (f) == 0) |
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202 { |
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203 using namespace std; |
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204 |
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205 do |
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206 { |
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207 wait_pid = ::waitpid (proc_pid, &wstatus, 0); |
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208 } |
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209 while (wait_pid == -1 && errno == EINTR); |
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210 } |
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211 |
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212 f = 0; |
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213 } |
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214 |
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215 open_p = false; |
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216 |
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217 return this; |
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218 |
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219 #else |
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220 |
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221 return 0; |
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222 |
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223 #endif |
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224 } |
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225 |
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226 static int |
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227 kluge_procbuf_delay (void) |
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228 { |
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229 double val; |
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230 if (builtin_real_scalar_variable ("__kluge_procbuf_delay__", val) |
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231 && ! xisnan (val)) |
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232 { |
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233 int ival = NINT (val); |
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234 if (ival >= 0 && (double) ival == val) |
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235 { |
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236 Vkluge_procbuf_delay = ival; |
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237 return 0; |
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238 } |
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239 } |
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240 gripe_invalid_value_specified ("__kluge_procbuf_delay__"); |
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241 return -1; |
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242 } |
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243 |
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244 void |
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245 symbols_of_oct_procbuf (void) |
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246 { |
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247 DEFVAR (__kluge_procbuf_delay__, Vkluge_procbuf_delay, kluge_procbuf_delay, |
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248 "-*- texinfo -*-\n\ |
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249 @defvr __kluge_procbuf_delay__\n\ |
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250 Number of microseconds to delay in the parent after forking.\n\ |
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251 @end defvr"); |
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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 ;;; Local Variables: *** |
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257 ;;; mode: C++ *** |
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258 ;;; End: *** |
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259 */ |
