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2094
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1 /* |
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2 |
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3 Copyright (C) 1996 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 #include <sys/types.h> |
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33 #include <unistd.h> |
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34 #endif |
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35 |
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36 #include "oct-procbuf.h" |
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37 #include "syswait.h" |
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38 |
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39 // This class is based on the procbuf class from libg++, written by |
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40 // Per Bothner, Copyright (C) 1993 Free Software Foundation. |
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41 // |
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42 // It should work with the filebuf class from libg++, but it might not |
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43 // work with others since it depends on being able to get at the |
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44 // underlying file descriptor with filebuf::fd(), which is not |
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45 // standard. |
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46 |
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47 static octave_procbuf *octave_procbuf_list = 0; |
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48 |
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49 octave_procbuf * |
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50 octave_procbuf::open (const char *command, int mode) |
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51 { |
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52 #if defined (HAVE_SYS_WAIT_H) |
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53 |
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54 int pipe_fds[2]; |
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55 |
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56 int parent_end, child_end; |
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57 |
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58 if (is_open ()) |
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59 return 0; |
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60 |
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61 if (pipe (pipe_fds) < 0) |
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62 return 0; |
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63 |
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64 if (mode & ios::in) |
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65 { |
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66 parent_end = pipe_fds[0]; |
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67 child_end = pipe_fds[1]; |
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68 } |
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69 else |
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70 { |
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71 parent_end = pipe_fds[1]; |
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72 child_end = pipe_fds[0]; |
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73 } |
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74 |
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75 proc_pid = fork (); |
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76 |
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77 if (proc_pid == 0) |
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78 { |
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79 int child_std_end = (mode & ios::in) ? 1 : 0; |
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80 |
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81 ::close (parent_end); |
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82 |
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83 if (child_end != child_std_end) |
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84 { |
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85 dup2 (child_end, child_std_end); |
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86 ::close (child_end); |
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87 } |
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88 |
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89 while (octave_procbuf_list) |
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90 { |
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91 ::close (octave_procbuf_list->fd ()); |
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92 octave_procbuf_list = octave_procbuf_list->next; |
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93 } |
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94 |
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95 execl ("/bin/sh", "sh", "-c", command, NULL); |
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96 |
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97 exit (127); |
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98 } |
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99 |
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100 ::close (child_end); |
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101 |
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102 if (proc_pid < 0) |
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103 { |
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104 ::close (parent_end); |
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105 return 0; |
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106 } |
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107 |
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108 attach (parent_end); |
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109 |
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110 next = octave_procbuf_list; |
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111 octave_procbuf_list = this; |
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112 |
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113 return this; |
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114 |
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115 #else |
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116 |
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117 return 0; |
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118 |
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119 #endif |
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120 } |
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121 |
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122 int |
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123 octave_procbuf::sys_close (void) |
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124 { |
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125 #if defined (HAVE_SYS_WAIT_H) |
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126 |
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127 int wstatus; |
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128 |
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129 pid_t wait_pid; |
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130 |
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131 int status = -1; |
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132 |
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133 for (octave_procbuf **ptr = &octave_procbuf_list; |
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134 *ptr != 0; |
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135 ptr = &(*ptr)->next) |
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136 { |
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137 if (*ptr == this) |
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138 { |
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139 *ptr = (*ptr)->next; |
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140 status = 0; |
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141 break; |
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142 } |
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143 } |
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144 |
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145 if (status < 0 || ::close (fd ()) < 0) |
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146 return -1; |
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147 |
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148 do |
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149 { |
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150 wait_pid = waitpid (proc_pid, &wstatus, 0); |
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151 } |
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152 while (wait_pid == -1 && errno == EINTR); |
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153 |
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154 if (wait_pid == -1) |
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155 return -1; |
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156 |
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157 return wstatus; |
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158 |
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159 #else |
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160 |
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161 return -1; |
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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 /* |
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167 ;;; Local Variables: *** |
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168 ;;; mode: C++ *** |
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169 ;;; End: *** |
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170 */ |
