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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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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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.h> |
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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 "syswait.h" |
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42 #include "variables.h" |
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43 |
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44 #include "defun.h" |
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45 #include "gripes.h" |
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46 |
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47 // Number of microseconds to delay in the parent after forking. |
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48 #if defined (__CYGWIN32__) |
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49 static int Vkluge_procbuf_delay = 500000; |
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50 #else |
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51 static int Vkluge_procbuf_delay = 0; |
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52 #endif |
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53 |
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54 // This class is based on the procbuf class from libg++, written by |
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55 // Per Bothner, Copyright (C) 1993 Free Software Foundation. |
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56 // |
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57 // It should work with the filebuf class from libg++, but it might not |
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58 // work with others since it depends on being able to get at the |
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59 // underlying file descriptor with filebuf::fd(), which is not |
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60 // standard. |
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61 |
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62 static octave_procbuf *octave_procbuf_list = 0; |
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63 |
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64 octave_procbuf * |
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65 octave_procbuf::open (const char *command, int mode) |
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66 { |
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67 #if defined (HAVE_SYS_WAIT_H) |
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68 |
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69 int pipe_fds[2]; |
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70 |
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71 volatile int child_std_end = (mode & ios::in) ? 1 : 0; |
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72 |
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73 volatile int parent_end, child_end; |
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74 |
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75 if (is_open ()) |
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76 return 0; |
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77 |
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78 if (pipe (pipe_fds) < 0) |
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79 return 0; |
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80 |
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81 if (mode & ios::in) |
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82 { |
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83 parent_end = pipe_fds[0]; |
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84 child_end = pipe_fds[1]; |
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85 } |
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86 else |
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87 { |
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88 parent_end = pipe_fds[1]; |
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89 child_end = pipe_fds[0]; |
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90 } |
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91 |
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92 proc_pid = ::fork (); |
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93 |
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94 if (proc_pid == 0) |
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95 { |
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96 ::close (parent_end); |
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97 |
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98 if (child_end != child_std_end) |
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99 { |
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100 ::dup2 (child_end, child_std_end); |
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101 ::close (child_end); |
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102 } |
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103 |
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104 while (octave_procbuf_list) |
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105 { |
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106 ::close (octave_procbuf_list->fd ()); |
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107 octave_procbuf_list = octave_procbuf_list->next; |
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108 } |
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109 |
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110 execl ("/bin/sh", "sh", "-c", command, NULL); |
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111 |
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112 exit (127); |
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113 } |
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114 |
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115 #if defined (HAVE_USLEEP) |
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116 if (Vkluge_procbuf_delay > 0) |
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117 usleep (Vkluge_procbuf_delay); |
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118 #else |
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119 if (Vkluge_procbuf_delay > 499999) |
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120 sleep ((Vkluge_procbuf_delay + 500000) / 1000000); |
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121 #endif |
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122 |
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123 ::close (child_end); |
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124 |
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125 if (proc_pid < 0) |
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126 { |
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127 ::close (parent_end); |
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128 return 0; |
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129 } |
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130 |
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131 attach (parent_end); |
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132 |
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133 next = octave_procbuf_list; |
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134 octave_procbuf_list = this; |
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135 |
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136 return this; |
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137 |
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138 #else |
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139 |
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140 return 0; |
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141 |
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142 #endif |
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143 } |
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144 |
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145 int |
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146 octave_procbuf::sys_close (void) |
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147 { |
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148 #if defined (HAVE_SYS_WAIT_H) |
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149 |
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150 pid_t wait_pid; |
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151 |
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152 int status = -1; |
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153 |
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154 for (octave_procbuf **ptr = &octave_procbuf_list; |
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155 *ptr != 0; |
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156 ptr = &(*ptr)->next) |
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157 { |
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158 if (*ptr == this) |
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159 { |
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160 *ptr = (*ptr)->next; |
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161 status = 0; |
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162 break; |
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163 } |
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164 } |
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165 |
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166 if (status < 0 || ::close (fd ()) < 0) |
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167 return -1; |
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168 |
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169 do |
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170 { |
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171 wait_pid = ::waitpid (proc_pid, &wstatus, 0); |
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172 } |
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173 while (wait_pid == -1 && errno == EINTR); |
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174 |
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175 if (wait_pid == -1) |
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176 return -1; |
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177 |
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178 return wstatus; |
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179 |
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180 #else |
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181 |
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182 return -1; |
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183 |
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184 #endif |
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185 } |
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186 |
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187 static int |
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188 kluge_procbuf_delay (void) |
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189 { |
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190 double val; |
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191 if (builtin_real_scalar_variable ("kluge_procbuf_delay", val) |
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192 && ! xisnan (val)) |
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193 { |
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194 int ival = NINT (val); |
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195 if (ival >= 0 && (double) ival == val) |
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196 { |
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197 Vkluge_procbuf_delay = ival; |
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198 return 0; |
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199 } |
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200 } |
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201 gripe_invalid_value_specified ("kluge_procbuf_delay"); |
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202 return -1; |
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203 } |
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204 |
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205 void |
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206 symbols_of_oct_procbuf (void) |
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207 { |
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208 DEFVAR (kluge_procbuf_delay, static_cast<double> (Vkluge_procbuf_delay), |
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209 kluge_procbuf_delay, |
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210 "number of microseconds to delay in the parent after forking"); |
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211 } |
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212 |
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213 /* |
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214 ;;; Local Variables: *** |
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215 ;;; mode: C++ *** |
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216 ;;; End: *** |
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217 */ |
