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