1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief POSIX Signals Manager Initialization |
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5 | * @ingroup POSIX_SIGNALS |
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6 | */ |
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7 | |
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8 | /* |
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9 | * COPYRIGHT (c) 1989-2008. |
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10 | * On-Line Applications Research Corporation (OAR). |
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11 | * |
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12 | * The license and distribution terms for this file may be |
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13 | * found in the file LICENSE in this distribution or at |
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14 | * http://www.rtems.org/license/LICENSE. |
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15 | */ |
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16 | |
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17 | #if HAVE_CONFIG_H |
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18 | #include "config.h" |
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19 | #endif |
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20 | |
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21 | #include <errno.h> |
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22 | #include <signal.h> |
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23 | #include <string.h> |
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24 | #include <stdlib.h> |
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25 | |
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26 | #include <rtems/score/isrlevel.h> |
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27 | #include <rtems/score/threadimpl.h> |
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28 | #include <rtems/score/threadqimpl.h> |
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29 | #include <rtems/score/watchdogimpl.h> |
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30 | #include <rtems/score/wkspace.h> |
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31 | #include <rtems/posix/threadsup.h> |
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32 | #include <rtems/posix/psignalimpl.h> |
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33 | #include <rtems/posix/pthreadimpl.h> |
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34 | #include <rtems/config.h> |
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35 | #include <rtems/seterr.h> |
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36 | #include <rtems/sysinit.h> |
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37 | |
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38 | /* |
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39 | * Ensure we have the same number of vectors and default vector entries |
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40 | */ |
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41 | RTEMS_STATIC_ASSERT( |
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42 | sizeof( _POSIX_signals_Vectors ) == sizeof( _POSIX_signals_Default_vectors ), |
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43 | posix_signals_vectors |
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44 | ); |
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45 | |
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46 | /*** PROCESS WIDE STUFF ****/ |
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47 | |
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48 | sigset_t _POSIX_signals_Pending; |
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49 | |
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50 | void _POSIX_signals_Abnormal_termination_handler( |
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51 | int signo RTEMS_UNUSED ) |
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52 | { |
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53 | exit( 1 ); |
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54 | } |
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55 | |
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56 | #define SIG_ARRAY_MAX (SIGRTMAX + 1) |
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57 | const struct sigaction _POSIX_signals_Default_vectors[ SIG_ARRAY_MAX ] = { |
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58 | /* NO SIGNAL 0 */ SIGACTION_IGNORE, |
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59 | /* SIGHUP 1 */ SIGACTION_TERMINATE, |
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60 | /* SIGINT 2 */ SIGACTION_TERMINATE, |
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61 | /* SIGQUIT 3 */ SIGACTION_TERMINATE, |
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62 | /* SIGILL 4 */ SIGACTION_TERMINATE, |
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63 | /* SIGTRAP 5 */ SIGACTION_TERMINATE, |
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64 | /* SIGIOT 6 */ SIGACTION_TERMINATE, |
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65 | /* SIGABRT 6 SIGACTION_TERMINATE, -- alias for SIGIOT */ |
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66 | /* SIGEMT 7 */ SIGACTION_TERMINATE, |
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67 | /* SIGFPE 8 */ SIGACTION_TERMINATE, |
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68 | /* SIGKILL 9 */ SIGACTION_TERMINATE, |
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69 | /* SIGBUS 10 */ SIGACTION_TERMINATE, |
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70 | /* SIGSEGV 11 */ SIGACTION_TERMINATE, |
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71 | /* SIGSYS 12 */ SIGACTION_TERMINATE, |
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72 | /* SIGPIPE 13 */ SIGACTION_TERMINATE, |
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73 | /* SIGALRM 14 */ SIGACTION_TERMINATE, |
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74 | /* SIGTERM 15 */ SIGACTION_TERMINATE, |
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75 | /* SIGURG 16 */ SIGACTION_TERMINATE, |
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76 | /* SIGSTOP 17 */ SIGACTION_TERMINATE, |
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77 | /* SIGTSTP 18 */ SIGACTION_TERMINATE, |
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78 | /* SIGCONT 19 */ SIGACTION_TERMINATE, |
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79 | /* SIGCHLD 20 */ SIGACTION_TERMINATE, |
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80 | /* SIGTTIN 21 */ SIGACTION_TERMINATE, |
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81 | /* SIGTTOU 22 */ SIGACTION_TERMINATE, |
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82 | /* SIGIO 23 */ SIGACTION_TERMINATE, |
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83 | /* SIGWINCH 24 */ SIGACTION_TERMINATE, |
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84 | /* SIGUSR1 25 */ SIGACTION_TERMINATE, |
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85 | /* SIGUSR2 26 */ SIGACTION_TERMINATE, |
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86 | /* SIGRT 27 */ SIGACTION_TERMINATE, |
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87 | /* SIGRT 28 */ SIGACTION_TERMINATE, |
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88 | /* SIGRT 29 */ SIGACTION_TERMINATE, |
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89 | /* SIGRT 30 */ SIGACTION_TERMINATE, |
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90 | /* SIGRTMAX 31 */ SIGACTION_TERMINATE |
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91 | }; |
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92 | |
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93 | struct sigaction _POSIX_signals_Vectors[ SIG_ARRAY_MAX ]; |
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94 | |
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95 | Thread_queue_Control _POSIX_signals_Wait_queue = |
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96 | THREAD_QUEUE_INITIALIZER( "POSIX Signals" ); |
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97 | |
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98 | Chain_Control _POSIX_signals_Inactive_siginfo; |
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99 | Chain_Control _POSIX_signals_Siginfo[ SIG_ARRAY_MAX ]; |
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100 | |
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101 | /* |
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102 | * XXX - move these |
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103 | */ |
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104 | |
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105 | #define _States_Is_interruptible_signal( _states ) \ |
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106 | ( ((_states) & \ |
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107 | (STATES_WAITING_FOR_SIGNAL|STATES_INTERRUPTIBLE_BY_SIGNAL)) == \ |
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108 | (STATES_WAITING_FOR_SIGNAL|STATES_INTERRUPTIBLE_BY_SIGNAL)) |
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109 | |
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110 | static void _POSIX_signals_Check_signal( |
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111 | POSIX_API_Control *api, |
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112 | int signo, |
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113 | bool is_global |
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114 | ) |
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115 | { |
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116 | siginfo_t siginfo_struct; |
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117 | sigset_t saved_signals_unblocked; |
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118 | Thread_Wait_information stored_thread_wait_information; |
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119 | Thread_Control *executing; |
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120 | |
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121 | if ( ! _POSIX_signals_Clear_signals( api, signo, &siginfo_struct, |
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122 | is_global, true, true ) ) |
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123 | return; |
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124 | |
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125 | /* |
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126 | * Since we made a union of these, only one test is necessary but this is |
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127 | * safer. |
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128 | */ |
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129 | #if defined(RTEMS_DEBUG) |
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130 | assert( _POSIX_signals_Vectors[ signo ].sa_handler || |
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131 | _POSIX_signals_Vectors[ signo ].sa_sigaction ); |
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132 | #endif |
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133 | |
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134 | /* |
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135 | * Just to prevent sending a signal which is currently being ignored. |
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136 | */ |
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137 | if ( _POSIX_signals_Vectors[ signo ].sa_handler == SIG_IGN ) |
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138 | return; |
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139 | |
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140 | /* |
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141 | * Block the signals requested in sa_mask |
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142 | */ |
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143 | saved_signals_unblocked = api->signals_unblocked; |
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144 | api->signals_unblocked &= ~_POSIX_signals_Vectors[ signo ].sa_mask; |
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145 | |
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146 | executing = _Thread_Get_executing(); |
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147 | |
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148 | /* |
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149 | * We have to save the blocking information of the current wait queue |
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150 | * because the signal handler may subsequently go on and put the thread |
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151 | * on a wait queue, for its own purposes. |
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152 | */ |
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153 | memcpy( &stored_thread_wait_information, &executing->Wait, |
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154 | sizeof( stored_thread_wait_information )); |
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155 | |
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156 | /* |
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157 | * Here, the signal handler function executes |
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158 | */ |
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159 | switch ( _POSIX_signals_Vectors[ signo ].sa_flags ) { |
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160 | case SA_SIGINFO: |
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161 | (*_POSIX_signals_Vectors[ signo ].sa_sigaction)( |
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162 | signo, |
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163 | &siginfo_struct, |
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164 | NULL /* context is undefined per 1003.1b-1993, p. 66 */ |
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165 | ); |
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166 | break; |
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167 | default: |
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168 | (*_POSIX_signals_Vectors[ signo ].sa_handler)( signo ); |
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169 | break; |
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170 | } |
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171 | |
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172 | /* |
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173 | * Restore the blocking information |
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174 | */ |
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175 | memcpy( &executing->Wait, &stored_thread_wait_information, |
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176 | sizeof( executing->Wait )); |
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177 | |
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178 | /* |
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179 | * Restore the previous set of unblocked signals |
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180 | */ |
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181 | api->signals_unblocked = saved_signals_unblocked; |
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182 | } |
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183 | |
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184 | void _POSIX_signals_Action_handler( |
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185 | Thread_Control *executing, |
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186 | Thread_Action *action, |
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187 | Per_CPU_Control *cpu, |
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188 | ISR_Level level |
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189 | ) |
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190 | { |
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191 | POSIX_API_Control *api; |
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192 | int signo; |
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193 | ISR_lock_Context lock_context; |
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194 | int hold_errno; |
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195 | |
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196 | (void) action; |
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197 | _Thread_Action_release_and_ISR_enable( cpu, level ); |
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198 | |
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199 | api = executing->API_Extensions[ THREAD_API_POSIX ]; |
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200 | |
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201 | /* |
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202 | * We need to ensure that if the signal handler executes a call |
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203 | * which overwrites the unblocking status, we restore it. |
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204 | */ |
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205 | hold_errno = executing->Wait.return_code; |
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206 | |
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207 | /* |
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208 | * api may be NULL in case of a thread close in progress |
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209 | */ |
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210 | if ( !api ) |
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211 | return; |
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212 | |
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213 | /* |
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214 | * If we invoke any user code, there is the possibility that |
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215 | * a new signal has been posted that we should process so we |
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216 | * restart the loop if a signal handler was invoked. |
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217 | * |
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218 | * The first thing done is to check there are any signals to be |
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219 | * processed at all. No point in doing this loop otherwise. |
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220 | */ |
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221 | while (1) { |
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222 | _POSIX_signals_Acquire( &lock_context ); |
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223 | if ( !(api->signals_unblocked & |
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224 | (api->signals_pending | _POSIX_signals_Pending)) ) { |
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225 | _POSIX_signals_Release( &lock_context ); |
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226 | break; |
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227 | } |
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228 | _POSIX_signals_Release( &lock_context ); |
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229 | |
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230 | for ( signo = SIGRTMIN ; signo <= SIGRTMAX ; signo++ ) { |
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231 | _POSIX_signals_Check_signal( api, signo, false ); |
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232 | _POSIX_signals_Check_signal( api, signo, true ); |
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233 | } |
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234 | /* Unfortunately - nothing like __SIGFIRSTNOTRT in newlib signal .h */ |
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235 | |
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236 | for ( signo = SIGHUP ; signo <= __SIGLASTNOTRT ; signo++ ) { |
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237 | _POSIX_signals_Check_signal( api, signo, false ); |
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238 | _POSIX_signals_Check_signal( api, signo, true ); |
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239 | } |
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240 | } |
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241 | |
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242 | executing->Wait.return_code = hold_errno; |
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243 | } |
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244 | |
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245 | static void _POSIX_signals_Manager_Initialization(void) |
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246 | { |
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247 | uint32_t signo; |
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248 | uint32_t maximum_queued_signals; |
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249 | |
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250 | maximum_queued_signals = Configuration_POSIX_API.maximum_queued_signals; |
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251 | |
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252 | memcpy( |
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253 | _POSIX_signals_Vectors, |
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254 | _POSIX_signals_Default_vectors, |
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255 | sizeof( _POSIX_signals_Vectors ) |
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256 | ); |
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257 | |
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258 | /* |
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259 | * Initialize the set of pending signals for the entire process |
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260 | */ |
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261 | sigemptyset( &_POSIX_signals_Pending ); |
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262 | |
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263 | /* XXX status codes */ |
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264 | |
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265 | /* |
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266 | * Allocate the siginfo pools. |
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267 | */ |
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268 | for ( signo=1 ; signo<= SIGRTMAX ; signo++ ) |
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269 | _Chain_Initialize_empty( &_POSIX_signals_Siginfo[ signo ] ); |
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270 | |
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271 | if ( maximum_queued_signals ) { |
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272 | _Chain_Initialize( |
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273 | &_POSIX_signals_Inactive_siginfo, |
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274 | _Workspace_Allocate_or_fatal_error( |
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275 | maximum_queued_signals * sizeof( POSIX_signals_Siginfo_node ) |
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276 | ), |
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277 | maximum_queued_signals, |
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278 | sizeof( POSIX_signals_Siginfo_node ) |
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279 | ); |
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280 | } else { |
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281 | _Chain_Initialize_empty( &_POSIX_signals_Inactive_siginfo ); |
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282 | } |
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283 | } |
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284 | |
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285 | RTEMS_SYSINIT_ITEM( |
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286 | _POSIX_signals_Manager_Initialization, |
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287 | RTEMS_SYSINIT_POSIX_SIGNALS, |
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288 | RTEMS_SYSINIT_ORDER_MIDDLE |
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289 | ); |
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