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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 /* |
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24 |
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25 The signal blocking macros defined below were adapted from similar |
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26 functions from GNU Bash, the Bourne Again SHell, copyright (C) 1994 |
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27 Free Software Foundation, Inc. |
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28 |
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29 */ |
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30 |
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31 // This file should always be included after config.h! |
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32 |
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33 #if !defined (octave_sighandlers_h) |
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34 #define octave_sighandlers_h 1 |
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35 |
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36 // Include signal.h, not csignal since the latter might only define |
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37 // the ANSI standard C signal interface. |
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38 |
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39 #include <signal.h> |
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40 |
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41 #include "syswait.h" |
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42 #include "siglist.h" |
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43 |
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44 #include "base-list.h" |
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45 |
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46 // Signal handler return type. |
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47 #ifndef RETSIGTYPE |
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48 #define RETSIGTYPE void |
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49 #endif |
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50 #ifndef BADSIG |
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51 #define BADSIG (RETSIGTYPE (*)(int))-1 |
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52 #endif |
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53 |
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54 #define BLOCK_SIGNAL(sig, nvar, ovar) \ |
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55 do \ |
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56 { \ |
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57 sigemptyset (&nvar); \ |
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58 sigaddset (&nvar, sig); \ |
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59 sigemptyset (&ovar); \ |
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60 sigprocmask (SIG_BLOCK, &nvar, &ovar); \ |
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61 } \ |
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62 while (0) |
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63 |
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64 #if !defined (SIGCHLD) && defined (SIGCLD) |
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65 #define SIGCHLD SIGCLD |
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66 #endif |
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67 |
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68 #if defined (HAVE_POSIX_SIGNALS) |
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69 #define BLOCK_CHILD(nvar, ovar) BLOCK_SIGNAL (SIGCHLD, nvar, ovar) |
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70 #define UNBLOCK_CHILD(ovar) sigprocmask (SIG_SETMASK, &ovar, 0) |
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71 #else |
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72 #define BLOCK_CHILD(nvar, ovar) ovar = sigblock (sigmask (SIGCHLD)) |
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73 #define UNBLOCK_CHILD(ovar) sigsetmask (ovar) |
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74 #endif |
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75 |
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76 typedef RETSIGTYPE sig_handler (int); |
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77 |
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78 // XXX FIXME XXX -- the data should probably be private... |
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79 |
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80 struct |
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81 octave_interrupt_handler |
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82 { |
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83 #ifdef SIGINT |
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84 sig_handler *int_handler; |
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85 #endif |
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86 |
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87 #ifdef SIGBREAK |
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88 sig_handler *brk_handler; |
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89 #endif |
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90 }; |
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91 |
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92 // Nonzero means we have already printed a message for this series of |
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93 // SIGPIPES. We assume that the writer will eventually give up. |
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94 extern int pipe_handler_error_count; |
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95 |
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96 // TRUE means we can be interrupted. |
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97 extern bool can_interrupt; |
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98 |
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99 extern sig_handler *octave_set_signal_handler (int, sig_handler *); |
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100 |
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101 extern void install_signal_handlers (void); |
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102 |
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103 extern void octave_signal_handler (void); |
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104 |
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105 extern octave_interrupt_handler octave_catch_interrupts (void); |
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106 |
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107 extern octave_interrupt_handler octave_ignore_interrupts (void); |
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108 |
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109 extern octave_interrupt_handler |
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110 octave_set_interrupt_handler (const volatile octave_interrupt_handler&); |
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111 |
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112 // extern void ignore_sigchld (void); |
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113 |
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114 // Maybe this should be in a separate file? |
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115 |
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116 class |
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117 octave_child |
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118 { |
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119 public: |
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120 |
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121 // Do whatever to handle event for child with PID (might not |
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122 // actually be dead, could just be stopped). Return true if |
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123 // the list element corresponding to PID should be removed from |
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124 // list. This function should not call any functions that modify |
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125 // the octave_child_list. |
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126 |
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127 typedef bool (*child_event_handler) (pid_t, int); |
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128 |
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129 octave_child (pid_t id = -1, child_event_handler f = 0) |
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130 : pid (id), handler (f), have_status (0), status (0) { } |
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131 |
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132 octave_child (const octave_child& oc) |
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133 : pid (oc.pid), handler (oc.handler), |
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134 have_status (oc.have_status), status (oc.status) { } |
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135 |
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136 octave_child& operator = (const octave_child& oc) |
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137 { |
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138 if (&oc != this) |
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139 { |
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140 pid = oc.pid; |
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141 handler = oc.handler; |
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142 have_status = oc.have_status; |
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143 status = oc.status; |
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144 } |
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145 return *this; |
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146 } |
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147 |
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148 ~octave_child (void) { } |
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149 |
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150 // The process id of this child. |
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151 pid_t pid; |
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152 |
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153 // The function we call if an event happens for this child. |
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154 child_event_handler handler; |
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155 |
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156 // Nonzero if this child has stopped or terminated. |
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157 sig_atomic_t have_status; |
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158 |
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159 // The status of this child; 0 if running, otherwise a status value |
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160 // from waitpid. |
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161 int status; |
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162 }; |
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163 |
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164 class |
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165 octave_child_list |
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166 { |
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167 protected: |
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168 |
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169 octave_child_list (void) { } |
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170 |
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171 class octave_child_list_rep : public octave_base_list<octave_child> |
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172 { |
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173 public: |
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174 |
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175 void insert (pid_t pid, octave_child::child_event_handler f); |
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176 |
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177 void reap (void); |
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178 |
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179 bool wait (void); |
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180 }; |
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181 |
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182 public: |
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183 |
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184 ~octave_child_list (void) { } |
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185 |
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186 static void insert (pid_t pid, octave_child::child_event_handler f); |
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187 |
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188 static void reap (void); |
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189 |
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190 static bool wait (void); |
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191 |
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192 static void remove (pid_t pid); |
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193 |
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194 private: |
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195 |
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196 static bool instance_ok (void); |
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197 |
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198 static octave_child_list_rep *instance; |
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199 }; |
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200 |
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201 #endif |
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202 |
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203 /* |
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204 ;;; Local Variables: *** |
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205 ;;; mode: C++ *** |
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206 ;;; End: *** |
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207 */ |
