1 | /* |
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2 | * $Id$ |
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3 | */ |
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4 | |
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5 | #include <assert.h> |
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6 | #include <errno.h> |
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7 | #include <pthread.h> |
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8 | #include <signal.h> |
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9 | |
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10 | #include <rtems/system.h> |
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11 | #include <rtems/score/isr.h> |
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12 | #include <rtems/score/thread.h> |
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13 | #include <rtems/score/tqdata.h> |
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14 | #include <rtems/score/wkspace.h> |
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15 | #include <rtems/posix/seterr.h> |
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16 | #include <rtems/posix/threadsup.h> |
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17 | #include <rtems/posix/psignal.h> |
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18 | #include <rtems/posix/pthread.h> |
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19 | #include <rtems/posix/time.h> |
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20 | |
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21 | /*** PROCESS WIDE STUFF ****/ |
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22 | |
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23 | sigset_t _POSIX_signals_Pending; |
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24 | |
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25 | struct sigaction _POSIX_signals_Vectors[ SIG_ARRAY_MAX ]; |
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26 | |
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27 | Watchdog_Control _POSIX_signals_Alarm_timer; |
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28 | |
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29 | Thread_queue_Control _POSIX_signals_Wait_queue; |
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30 | |
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31 | Chain_Control _POSIX_signals_Inactive_siginfo; |
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32 | Chain_Control _POSIX_signals_Siginfo[ SIG_ARRAY_MAX ]; |
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33 | |
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34 | struct sigaction _POSIX_signals_Default_vectors[ SIG_ARRAY_MAX ] = { |
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35 | /* NO SIGNAL 0 */ SIGACTION_IGNORE, |
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36 | /* SIGHUP 1 */ SIGACTION_TERMINATE, |
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37 | /* SIGINT 2 */ SIGACTION_TERMINATE, |
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38 | /* SIGQUIT 3 */ SIGACTION_TERMINATE, |
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39 | /* SIGILL 4 */ SIGACTION_TERMINATE, |
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40 | /* SIGTRAP 5 */ SIGACTION_TERMINATE, |
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41 | /* SIGIOT 6 */ SIGACTION_TERMINATE, |
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42 | /* SIGABRT 6 SIGACTION_TERMINATE, -- alias for SIGIOT */ |
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43 | /* SIGEMT 7 */ SIGACTION_TERMINATE, |
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44 | /* SIGFPE 8 */ SIGACTION_TERMINATE, |
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45 | /* SIGKILL 9 */ SIGACTION_TERMINATE, |
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46 | /* SIGBUS 10 */ SIGACTION_TERMINATE, |
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47 | /* SIGSEGV 11 */ SIGACTION_TERMINATE, |
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48 | /* SIGSYS 12 */ SIGACTION_TERMINATE, |
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49 | /* SIGPIPE 13 */ SIGACTION_TERMINATE, |
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50 | /* SIGALRM 14 */ SIGACTION_TERMINATE, |
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51 | /* SIGTERM 15 */ SIGACTION_TERMINATE, |
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52 | /* SIGUSR1 16 */ SIGACTION_TERMINATE, |
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53 | /* SIGUSR2 17 */ SIGACTION_TERMINATE, |
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54 | /* SIGRTMIN 18 */ SIGACTION_IGNORE, |
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55 | /* SIGRT 19 */ SIGACTION_IGNORE, |
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56 | /* SIGRT 20 */ SIGACTION_IGNORE, |
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57 | /* SIGRT 21 */ SIGACTION_IGNORE, |
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58 | /* SIGRT 22 */ SIGACTION_IGNORE, |
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59 | /* SIGRT 23 */ SIGACTION_IGNORE, |
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60 | /* SIGRT 24 */ SIGACTION_IGNORE, |
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61 | /* SIGRT 25 */ SIGACTION_IGNORE, |
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62 | /* SIGRT 26 */ SIGACTION_IGNORE, |
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63 | /* SIGRT 27 */ SIGACTION_IGNORE, |
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64 | /* SIGRT 28 */ SIGACTION_IGNORE, |
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65 | /* SIGRT 29 */ SIGACTION_IGNORE, |
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66 | /* SIGRT 30 */ SIGACTION_IGNORE, |
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67 | /* SIGRT 31 */ SIGACTION_IGNORE, |
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68 | /* SIGRTMAX 32 */ SIGACTION_IGNORE |
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69 | }; |
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70 | |
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71 | /*PAGE |
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72 | * |
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73 | * _POSIX_signals_Abormal_termination_handler |
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74 | * |
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75 | */ |
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76 | |
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77 | void _POSIX_signals_Abormal_termination_handler( int signo ) |
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78 | { |
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79 | exit( 1 ); |
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80 | } |
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81 | |
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82 | /*PAGE |
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83 | * |
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84 | * _POSIX_signals_Unblock_thread |
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85 | */ |
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86 | |
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87 | /* XXX this routine could probably be cleaned up */ |
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88 | boolean _POSIX_signals_Unblock_thread( |
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89 | Thread_Control *the_thread, |
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90 | int signo, |
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91 | siginfo_t *info |
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92 | ) |
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93 | { |
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94 | POSIX_API_Control *api; |
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95 | sigset_t mask; |
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96 | siginfo_t *the_info = NULL; |
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97 | |
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98 | api = the_thread->API_Extensions[ THREAD_API_POSIX ]; |
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99 | |
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100 | mask = signo_to_mask( signo ); |
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101 | |
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102 | /* |
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103 | * Is the thread is specifically waiting for a signal? |
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104 | */ |
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105 | |
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106 | if ( _States_Is_interruptible_signal( the_thread->current_state ) ) { |
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107 | |
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108 | if ( (the_thread->Wait.option & mask) || (~api->signals_blocked & mask) ) { |
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109 | the_thread->Wait.return_code = EINTR; |
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110 | |
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111 | the_info = (siginfo_t *) the_thread->Wait.return_argument; |
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112 | |
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113 | if ( !info ) { |
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114 | the_info->si_signo = signo; |
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115 | the_info->si_code = SI_USER; |
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116 | the_info->si_value.sival_int = 0; |
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117 | } else { |
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118 | *the_info = *info; |
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119 | } |
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120 | |
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121 | _Thread_queue_Extract_with_proxy( the_thread ); |
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122 | return TRUE; |
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123 | } |
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124 | |
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125 | /* |
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126 | * This should only be reached via pthread_kill(). |
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127 | */ |
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128 | |
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129 | return FALSE; |
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130 | } |
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131 | |
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132 | if ( ~api->signals_blocked & mask ) { |
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133 | the_thread->do_post_task_switch_extension = TRUE; |
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134 | |
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135 | if ( the_thread->current_state & STATES_INTERRUPTIBLE_BY_SIGNAL ) { |
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136 | the_thread->Wait.return_code = EINTR; |
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137 | if ( _States_Is_waiting_on_thread_queue(the_thread->current_state) ) |
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138 | _Thread_queue_Extract_with_proxy( the_thread ); |
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139 | else if ( _States_Is_delaying(the_thread->current_state)){ |
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140 | if ( _Watchdog_Is_active( &the_thread->Timer ) ) |
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141 | (void) _Watchdog_Remove( &the_thread->Timer ); |
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142 | _Thread_Unblock( the_thread ); |
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143 | } |
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144 | } |
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145 | } |
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146 | return FALSE; |
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147 | |
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148 | } |
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149 | |
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150 | /*PAGE |
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151 | * |
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152 | * _POSIX_signals_Set_process_signals |
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153 | */ |
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154 | |
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155 | void _POSIX_signals_Set_process_signals( |
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156 | sigset_t mask |
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157 | ) |
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158 | { |
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159 | ISR_Level level; |
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160 | |
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161 | _ISR_Disable( level ); |
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162 | if ( !_POSIX_signals_Pending ) |
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163 | _Thread_Do_post_task_switch_extension++; |
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164 | _POSIX_signals_Pending |= mask; |
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165 | _ISR_Enable( level ); |
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166 | } |
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167 | |
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168 | /*PAGE |
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169 | * |
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170 | * _POSIX_signals_Clear_process_signals |
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171 | */ |
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172 | |
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173 | void _POSIX_signals_Clear_process_signals( |
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174 | sigset_t mask |
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175 | ) |
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176 | { |
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177 | ISR_Level level; |
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178 | |
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179 | _ISR_Disable( level ); |
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180 | _POSIX_signals_Pending &= ~mask; |
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181 | if ( !_POSIX_signals_Pending && _Thread_Do_post_task_switch_extension ) |
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182 | _Thread_Do_post_task_switch_extension--; |
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183 | _ISR_Enable( level ); |
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184 | } |
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185 | |
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186 | /*PAGE |
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187 | * |
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188 | * _POSIX_signals_Clear_signals |
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189 | */ |
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190 | |
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191 | boolean _POSIX_signals_Clear_signals( |
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192 | POSIX_API_Control *api, |
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193 | int signo, |
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194 | siginfo_t *info, |
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195 | boolean is_global, |
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196 | boolean check_blocked |
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197 | ) |
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198 | { |
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199 | sigset_t mask; |
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200 | sigset_t signals_blocked; |
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201 | ISR_Level level; |
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202 | boolean do_callout; |
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203 | POSIX_signals_Siginfo_node *psiginfo; |
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204 | |
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205 | mask = signo_to_mask( signo ); |
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206 | |
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207 | do_callout = FALSE; |
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208 | |
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209 | /* set blocked signals based on if checking for them, SIGNAL_ALL_MASK |
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210 | * insures that no signals are blocked and all are checked. |
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211 | */ |
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212 | |
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213 | if ( check_blocked ) |
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214 | signals_blocked = ~api->signals_blocked; |
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215 | else |
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216 | signals_blocked = SIGNAL_ALL_MASK; |
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217 | |
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218 | /* XXX this is not right for siginfo type signals yet */ |
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219 | /* XXX since they can't be cleared the same way */ |
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220 | |
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221 | _ISR_Disable( level ); |
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222 | if ( is_global ) { |
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223 | if ( mask & (_POSIX_signals_Pending & signals_blocked) ) { |
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224 | if ( _POSIX_signals_Vectors[ signo ].sa_flags == SA_SIGINFO ) { |
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225 | psiginfo = (POSIX_signals_Siginfo_node *) |
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226 | _Chain_Get_unprotected( &_POSIX_signals_Siginfo[ signo ] ); |
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227 | if ( _Chain_Is_empty( &_POSIX_signals_Siginfo[ signo ] ) ) |
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228 | _POSIX_signals_Clear_process_signals( mask ); |
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229 | if ( psiginfo ) { |
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230 | *info = psiginfo->Info; |
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231 | _Chain_Append_unprotected( |
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232 | &_POSIX_signals_Inactive_siginfo, |
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233 | &psiginfo->Node |
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234 | ); |
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235 | } else |
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236 | do_callout = FALSE; |
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237 | } else |
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238 | _POSIX_signals_Clear_process_signals( mask ); |
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239 | do_callout = TRUE; |
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240 | } |
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241 | } else { |
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242 | if ( mask & (api->signals_pending & signals_blocked) ) { |
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243 | api->signals_pending &= ~mask; |
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244 | do_callout = TRUE; |
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245 | } |
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246 | } |
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247 | _ISR_Enable( level ); |
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248 | return do_callout; |
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249 | } |
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250 | |
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251 | |
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252 | /*PAGE |
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253 | * |
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254 | * _POSIX_signals_Check_signal |
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255 | */ |
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256 | |
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257 | boolean _POSIX_signals_Check_signal( |
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258 | POSIX_API_Control *api, |
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259 | int signo, |
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260 | boolean is_global |
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261 | ) |
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262 | { |
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263 | siginfo_t siginfo_struct; |
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264 | sigset_t saved_signals_blocked; |
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265 | |
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266 | if ( ! _POSIX_signals_Clear_signals( api, signo, &siginfo_struct, |
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267 | is_global, TRUE ) ) |
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268 | return FALSE; |
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269 | |
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270 | /* |
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271 | * Since we made a union of these, only one test is necessary but this is |
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272 | * safer. |
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273 | */ |
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274 | |
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275 | assert( _POSIX_signals_Vectors[ signo ].sa_handler || |
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276 | _POSIX_signals_Vectors[ signo ].sa_sigaction ); |
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277 | |
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278 | /* |
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279 | * Just to prevent sending a signal which is currently being ignored. |
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280 | */ |
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281 | |
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282 | if ( _POSIX_signals_Vectors[ signo ].sa_handler == SIG_IGN ) |
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283 | return FALSE; |
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284 | |
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285 | /* |
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286 | * Block the signals requested in sa_mask |
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287 | */ |
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288 | |
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289 | saved_signals_blocked = api->signals_blocked; |
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290 | api->signals_blocked |= _POSIX_signals_Vectors[ signo ].sa_mask; |
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291 | |
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292 | switch ( _POSIX_signals_Vectors[ signo ].sa_flags ) { |
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293 | case SA_SIGINFO: |
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294 | assert( is_global ); |
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295 | |
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296 | (*_POSIX_signals_Vectors[ signo ].sa_sigaction)( |
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297 | signo, |
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298 | &siginfo_struct, |
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299 | NULL /* context is undefined per 1003.1b-1993, p. 66 */ |
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300 | ); |
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301 | break; |
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302 | default: |
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303 | (*_POSIX_signals_Vectors[ signo ].sa_handler)( signo ); |
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304 | break; |
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305 | } |
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306 | |
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307 | /* |
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308 | * Restore the previous set of blocked signals |
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309 | */ |
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310 | |
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311 | api->signals_blocked = saved_signals_blocked; |
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312 | |
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313 | return TRUE; |
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314 | } |
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315 | |
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316 | void _POSIX_signals_Post_switch_extension( |
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317 | Thread_Control *the_thread |
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318 | ) |
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319 | { |
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320 | POSIX_API_Control *api; |
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321 | int signo; |
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322 | ISR_Level level; |
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323 | |
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324 | api = the_thread->API_Extensions[ THREAD_API_POSIX ]; |
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325 | |
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326 | /* |
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327 | * If we invoke any user code, there is the possibility that |
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328 | * a new signal has been posted that we should process so we |
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329 | * restart the loop if a signal handler was invoked. |
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330 | * |
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331 | * The first thing done is to check there are any signals to be |
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332 | * processed at all. No point in doing this loop otherwise. |
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333 | */ |
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334 | |
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335 | restart: |
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336 | _ISR_Disable( level ); |
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337 | if ( !(~api->signals_blocked & |
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338 | (api->signals_pending | _POSIX_signals_Pending)) ) { |
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339 | _ISR_Enable( level ); |
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340 | return; |
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341 | } |
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342 | _ISR_Enable( level ); |
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343 | |
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344 | for ( signo = SIGRTMIN ; signo <= SIGRTMAX ; signo++ ) { |
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345 | |
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346 | if ( _POSIX_signals_Check_signal( api, signo, FALSE ) ) |
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347 | goto restart; |
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348 | |
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349 | if ( _POSIX_signals_Check_signal( api, signo, TRUE ) ) |
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350 | goto restart; |
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351 | |
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352 | } |
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353 | |
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354 | /* XXX - add __SIGFIRSTNOTRT or something like that to newlib siginfo.h */ |
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355 | |
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356 | for ( signo = SIGHUP ; signo <= __SIGLASTNOTRT ; signo++ ) { |
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357 | |
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358 | if ( _POSIX_signals_Check_signal( api, signo, FALSE ) ) |
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359 | goto restart; |
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360 | |
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361 | if ( _POSIX_signals_Check_signal( api, signo, TRUE ) ) |
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362 | goto restart; |
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363 | |
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364 | } |
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365 | |
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366 | } |
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367 | |
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368 | /*PAGE |
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369 | * |
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370 | * _POSIX_signals_Alarm_TSR |
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371 | */ |
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372 | |
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373 | void _POSIX_signals_Alarm_TSR( |
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374 | Objects_Id id, |
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375 | void *argument |
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376 | ) |
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377 | { |
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378 | int status; |
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379 | |
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380 | status = kill( getpid(), SIGALRM ); |
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381 | /* XXX can't print from an ISR, should this be fatal? */ |
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382 | assert( !status ); |
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383 | } |
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384 | |
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385 | /*PAGE |
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386 | * |
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387 | * _POSIX_signals_Manager_Initialization |
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388 | */ |
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389 | |
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390 | void _POSIX_signals_Manager_Initialization( |
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391 | int maximum_queued_signals |
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392 | ) |
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393 | { |
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394 | unsigned32 signo; |
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395 | |
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396 | /* |
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397 | * Insure we have the same number of vectors and default vector entries |
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398 | */ |
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399 | |
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400 | assert( |
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401 | sizeof(_POSIX_signals_Vectors) == sizeof(_POSIX_signals_Default_vectors) |
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402 | ); |
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403 | |
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404 | memcpy( |
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405 | _POSIX_signals_Vectors, |
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406 | _POSIX_signals_Default_vectors, |
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407 | sizeof( _POSIX_signals_Vectors ) |
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408 | ); |
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409 | |
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410 | /* |
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411 | * Initialize the set of pending signals for the entire process |
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412 | */ |
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413 | |
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414 | sigemptyset( &_POSIX_signals_Pending ); |
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415 | |
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416 | /* |
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417 | * Initialize the timer used to implement alarm(). |
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418 | */ |
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419 | |
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420 | _Watchdog_Initialize( |
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421 | &_POSIX_signals_Alarm_timer, |
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422 | _POSIX_signals_Alarm_TSR, |
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423 | 0, |
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424 | NULL |
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425 | ); |
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426 | |
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427 | /* |
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428 | * Initialize the queue we use to block for signals |
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429 | */ |
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430 | |
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431 | _Thread_queue_Initialize( |
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432 | &_POSIX_signals_Wait_queue, |
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433 | OBJECTS_NO_CLASS, |
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434 | THREAD_QUEUE_DISCIPLINE_PRIORITY, |
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435 | STATES_WAITING_FOR_SIGNAL | STATES_INTERRUPTIBLE_BY_SIGNAL, |
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436 | NULL, |
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437 | EAGAIN |
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438 | ); |
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439 | |
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440 | /* XXX status codes */ |
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441 | |
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442 | /* |
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443 | * Allocate the siginfo pools. |
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444 | */ |
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445 | |
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446 | for ( signo=1 ; signo<= SIGRTMAX ; signo++ ) |
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447 | _Chain_Initialize_empty( &_POSIX_signals_Siginfo[ signo ] ); |
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448 | |
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449 | _Chain_Initialize( |
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450 | &_POSIX_signals_Inactive_siginfo, |
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451 | _Workspace_Allocate_or_fatal_error( |
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452 | maximum_queued_signals * sizeof( POSIX_signals_Siginfo_node ) |
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453 | ), |
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454 | maximum_queued_signals, |
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455 | sizeof( POSIX_signals_Siginfo_node ) |
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456 | ); |
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457 | } |
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