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 | /* |
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22 | * Currently 32 signals numbered 1-32 are defined |
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23 | */ |
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24 | |
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25 | #define SIGNAL_EMPTY_MASK 0x00000000 |
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26 | #define SIGNAL_ALL_MASK 0xffffffff |
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27 | |
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28 | #define signo_to_mask( _sig ) (1 << ((_sig) - 1)) |
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29 | |
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30 | #define is_valid_signo( _sig ) \ |
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31 | ((_sig) >= 1 && (_sig) <= 32 ) |
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32 | |
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33 | /*** PROCESS WIDE STUFF ****/ |
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34 | |
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35 | sigset_t _POSIX_signals_Pending; |
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36 | |
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37 | void _POSIX_signals_Abormal_termination_handler( int signo ) |
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38 | { |
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39 | exit( 1 ); |
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40 | } |
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41 | |
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42 | #define _POSIX_signals_Stop_handler NULL |
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43 | #define _POSIX_signals_Continue_handler NULL |
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44 | |
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45 | #define SIGACTION_TERMINATE \ |
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46 | { 0, SIGNAL_ALL_MASK, {_POSIX_signals_Abormal_termination_handler} } |
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47 | #define SIGACTION_IGNORE \ |
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48 | { 0, SIGNAL_ALL_MASK, {SIG_IGN} } |
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49 | #define SIGACTION_STOP \ |
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50 | { 0, SIGNAL_ALL_MASK, {_POSIX_signals_Stop_handler} } |
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51 | #define SIGACTION_CONTINUE \ |
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52 | { 0, SIGNAL_ALL_MASK, {_POSIX_signals_Continue_handler} } |
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53 | |
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54 | #define SIG_ARRAY_MAX (SIGRTMAX + 1) |
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55 | struct sigaction _POSIX_signals_Default_vectors[ SIG_ARRAY_MAX ] = { |
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56 | /* NO SIGNAL 0 */ SIGACTION_IGNORE, |
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57 | /* SIGHUP 1 */ SIGACTION_TERMINATE, |
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58 | /* SIGINT 2 */ SIGACTION_TERMINATE, |
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59 | /* SIGQUIT 3 */ SIGACTION_TERMINATE, |
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60 | /* SIGILL 4 */ SIGACTION_TERMINATE, |
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61 | /* SIGTRAP 5 */ SIGACTION_TERMINATE, |
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62 | /* SIGIOT 6 */ SIGACTION_TERMINATE, |
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63 | /* SIGABRT 6 SIGACTION_TERMINATE, -- alias for SIGIOT */ |
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64 | /* SIGEMT 7 */ SIGACTION_TERMINATE, |
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65 | /* SIGFPE 8 */ SIGACTION_TERMINATE, |
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66 | /* SIGKILL 9 */ SIGACTION_TERMINATE, |
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67 | /* SIGBUS 10 */ SIGACTION_TERMINATE, |
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68 | /* SIGSEGV 11 */ SIGACTION_TERMINATE, |
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69 | /* SIGSYS 12 */ SIGACTION_TERMINATE, |
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70 | /* SIGPIPE 13 */ SIGACTION_TERMINATE, |
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71 | /* SIGALRM 14 */ SIGACTION_TERMINATE, |
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72 | /* SIGTERM 15 */ SIGACTION_TERMINATE, |
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73 | /* SIGUSR1 16 */ SIGACTION_TERMINATE, |
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74 | /* SIGUSR2 17 */ SIGACTION_TERMINATE, |
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75 | /* SIGRTMIN 18 */ SIGACTION_IGNORE, |
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76 | /* SIGRT 19 */ SIGACTION_IGNORE, |
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77 | /* SIGRT 20 */ SIGACTION_IGNORE, |
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78 | /* SIGRT 21 */ SIGACTION_IGNORE, |
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79 | /* SIGRT 22 */ SIGACTION_IGNORE, |
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80 | /* SIGRT 23 */ SIGACTION_IGNORE, |
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81 | /* SIGRT 24 */ SIGACTION_IGNORE, |
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82 | /* SIGRT 25 */ SIGACTION_IGNORE, |
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83 | /* SIGRT 26 */ SIGACTION_IGNORE, |
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84 | /* SIGRT 27 */ SIGACTION_IGNORE, |
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85 | /* SIGRT 28 */ SIGACTION_IGNORE, |
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86 | /* SIGRT 29 */ SIGACTION_IGNORE, |
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87 | /* SIGRT 30 */ SIGACTION_IGNORE, |
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88 | /* SIGRT 31 */ SIGACTION_IGNORE, |
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89 | /* SIGRTMAX 32 */ SIGACTION_IGNORE |
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90 | }; |
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91 | |
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92 | struct sigaction _POSIX_signals_Vectors[ SIG_ARRAY_MAX ]; |
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93 | |
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94 | Watchdog_Control _POSIX_signals_Alarm_timer; |
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95 | |
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96 | Thread_queue_Control _POSIX_signals_Wait_queue; |
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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 | /*PAGE |
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102 | * |
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103 | * XXX - move these |
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104 | */ |
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105 | |
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106 | #define _States_Is_interruptible_signal( _states ) \ |
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107 | ( ((_states) & \ |
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108 | (STATES_WAITING_FOR_SIGNAL|STATES_INTERRUPTIBLE_BY_SIGNAL)) == \ |
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109 | (STATES_WAITING_FOR_SIGNAL|STATES_INTERRUPTIBLE_BY_SIGNAL)) |
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110 | |
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111 | /*PAGE |
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112 | * |
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113 | * _POSIX_signals_Unblock_thread |
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114 | */ |
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115 | |
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116 | /* XXX this routine could probably be cleaned up */ |
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117 | boolean _POSIX_signals_Unblock_thread( |
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118 | Thread_Control *the_thread, |
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119 | int signo, |
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120 | siginfo_t *info |
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121 | ) |
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122 | { |
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123 | POSIX_API_Control *api; |
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124 | sigset_t mask; |
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125 | siginfo_t *the_info = NULL; |
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126 | |
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127 | api = the_thread->API_Extensions[ THREAD_API_POSIX ]; |
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128 | |
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129 | mask = signo_to_mask( signo ); |
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130 | |
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131 | /* |
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132 | * Is the thread is specifically waiting for a signal? |
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133 | */ |
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134 | |
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135 | if ( _States_Is_interruptible_signal( the_thread->current_state ) ) { |
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136 | |
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137 | if ( (the_thread->Wait.option & mask) || (~api->signals_blocked & mask) ) { |
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138 | the_thread->Wait.return_code = EINTR; |
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139 | |
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140 | the_info = (siginfo_t *) the_thread->Wait.return_argument; |
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141 | |
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142 | if ( !info ) { |
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143 | the_info->si_signo = signo; |
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144 | the_info->si_code = SI_USER; |
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145 | the_info->si_value.sival_int = 0; |
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146 | } else { |
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147 | *the_info = *info; |
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148 | } |
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149 | |
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150 | _Thread_queue_Extract_with_proxy( the_thread ); |
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151 | return TRUE; |
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152 | } |
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153 | |
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154 | /* |
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155 | * This should only be reached via pthread_kill(). |
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156 | */ |
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157 | |
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158 | return FALSE; |
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159 | } |
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160 | |
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161 | if ( ~api->signals_blocked & mask ) { |
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162 | the_thread->do_post_task_switch_extension = TRUE; |
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163 | |
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164 | if ( the_thread->current_state & STATES_INTERRUPTIBLE_BY_SIGNAL ) { |
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165 | the_thread->Wait.return_code = EINTR; |
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166 | if ( _States_Is_waiting_on_thread_queue(the_thread->current_state) ) |
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167 | _Thread_queue_Extract_with_proxy( the_thread ); |
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168 | else if ( _States_Is_delaying(the_thread->current_state)){ |
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169 | if ( _Watchdog_Is_active( &the_thread->Timer ) ) |
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170 | (void) _Watchdog_Remove( &the_thread->Timer ); |
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171 | _Thread_Unblock( the_thread ); |
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172 | } |
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173 | } |
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174 | } |
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175 | return FALSE; |
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176 | |
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177 | } |
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178 | |
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179 | /*PAGE |
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180 | * |
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181 | * _POSIX_signals_Set_process_signals |
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182 | */ |
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183 | |
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184 | void _POSIX_signals_Set_process_signals( |
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185 | sigset_t mask |
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186 | ) |
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187 | { |
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188 | ISR_Level level; |
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189 | |
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190 | _ISR_Disable( level ); |
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191 | if ( !_POSIX_signals_Pending ) |
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192 | _Thread_Do_post_task_switch_extension++; |
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193 | _POSIX_signals_Pending |= mask; |
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194 | _ISR_Enable( level ); |
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195 | } |
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196 | |
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197 | /*PAGE |
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198 | * |
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199 | * _POSIX_signals_Clear_process_signals |
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200 | */ |
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201 | |
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202 | void _POSIX_signals_Clear_process_signals( |
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203 | sigset_t mask |
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204 | ) |
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205 | { |
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206 | ISR_Level level; |
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207 | |
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208 | _ISR_Disable( level ); |
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209 | _POSIX_signals_Pending &= ~mask; |
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210 | if ( !_POSIX_signals_Pending && _Thread_Do_post_task_switch_extension ) |
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211 | _Thread_Do_post_task_switch_extension--; |
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212 | _ISR_Enable( level ); |
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213 | } |
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214 | |
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215 | /*PAGE |
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216 | * |
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217 | * _POSIX_signals_Clear_signals |
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218 | */ |
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219 | |
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220 | boolean _POSIX_signals_Clear_signals( |
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221 | POSIX_API_Control *api, |
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222 | int signo, |
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223 | siginfo_t *info, |
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224 | boolean is_global, |
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225 | boolean check_blocked |
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226 | ) |
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227 | { |
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228 | sigset_t mask; |
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229 | sigset_t signals_blocked; |
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230 | ISR_Level level; |
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231 | boolean do_callout; |
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232 | POSIX_signals_Siginfo_node *psiginfo; |
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233 | |
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234 | mask = signo_to_mask( signo ); |
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235 | |
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236 | do_callout = FALSE; |
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237 | |
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238 | /* set blocked signals based on if checking for them, SIGNAL_ALL_MASK |
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239 | * insures that no signals are blocked and all are checked. |
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240 | */ |
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241 | |
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242 | if ( check_blocked ) |
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243 | signals_blocked = ~api->signals_blocked; |
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244 | else |
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245 | signals_blocked = SIGNAL_ALL_MASK; |
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246 | |
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247 | /* XXX this is not right for siginfo type signals yet */ |
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248 | /* XXX since they can't be cleared the same way */ |
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249 | |
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250 | _ISR_Disable( level ); |
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251 | if ( is_global ) { |
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252 | if ( mask & (_POSIX_signals_Pending & signals_blocked) ) { |
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253 | if ( _POSIX_signals_Vectors[ signo ].sa_flags == SA_SIGINFO ) { |
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254 | psiginfo = (POSIX_signals_Siginfo_node *) |
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255 | _Chain_Get_unprotected( &_POSIX_signals_Siginfo[ signo ] ); |
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256 | if ( _Chain_Is_empty( &_POSIX_signals_Siginfo[ signo ] ) ) |
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257 | _POSIX_signals_Clear_process_signals( mask ); |
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258 | if ( psiginfo ) { |
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259 | *info = psiginfo->Info; |
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260 | _Chain_Append_unprotected( |
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261 | &_POSIX_signals_Inactive_siginfo, |
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262 | &psiginfo->Node |
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263 | ); |
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264 | } else |
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265 | do_callout = FALSE; |
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266 | } else |
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267 | _POSIX_signals_Clear_process_signals( mask ); |
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268 | do_callout = TRUE; |
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269 | } |
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270 | } else { |
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271 | if ( mask & (api->signals_pending & signals_blocked) ) { |
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272 | api->signals_pending &= ~mask; |
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273 | do_callout = TRUE; |
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274 | } |
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275 | } |
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276 | _ISR_Enable( level ); |
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277 | return do_callout; |
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278 | } |
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279 | |
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280 | |
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281 | /*PAGE |
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282 | * |
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283 | * _POSIX_signals_Check_signal |
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284 | */ |
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285 | |
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286 | boolean _POSIX_signals_Check_signal( |
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287 | POSIX_API_Control *api, |
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288 | int signo, |
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289 | boolean is_global |
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290 | ) |
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291 | { |
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292 | siginfo_t siginfo_struct; |
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293 | sigset_t saved_signals_blocked; |
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294 | |
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295 | if ( ! _POSIX_signals_Clear_signals( api, signo, &siginfo_struct, |
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296 | is_global, TRUE ) ) |
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297 | return FALSE; |
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298 | |
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299 | /* |
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300 | * Since we made a union of these, only one test is necessary but this is |
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301 | * safer. |
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302 | */ |
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303 | |
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304 | assert( _POSIX_signals_Vectors[ signo ].sa_handler || |
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305 | _POSIX_signals_Vectors[ signo ].sa_sigaction ); |
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306 | |
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307 | /* |
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308 | * Just to prevent sending a signal which is currently being ignored. |
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309 | */ |
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310 | |
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311 | if ( _POSIX_signals_Vectors[ signo ].sa_handler == SIG_IGN ) |
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312 | return FALSE; |
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313 | |
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314 | /* |
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315 | * Block the signals requested in sa_mask |
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316 | */ |
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317 | |
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318 | saved_signals_blocked = api->signals_blocked; |
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319 | api->signals_blocked |= _POSIX_signals_Vectors[ signo ].sa_mask; |
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320 | |
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321 | switch ( _POSIX_signals_Vectors[ signo ].sa_flags ) { |
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322 | case SA_SIGINFO: |
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323 | assert( is_global ); |
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324 | |
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325 | (*_POSIX_signals_Vectors[ signo ].sa_sigaction)( |
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326 | signo, |
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327 | &siginfo_struct, |
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328 | NULL /* context is undefined per 1003.1b-1993, p. 66 */ |
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329 | ); |
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330 | break; |
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331 | default: |
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332 | (*_POSIX_signals_Vectors[ signo ].sa_handler)( signo ); |
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333 | break; |
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334 | } |
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335 | |
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336 | /* |
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337 | * Restore the previous set of blocked signals |
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338 | */ |
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339 | |
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340 | api->signals_blocked = saved_signals_blocked; |
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341 | |
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342 | return TRUE; |
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343 | } |
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344 | |
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345 | void _POSIX_signals_Post_switch_extension( |
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346 | Thread_Control *the_thread |
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347 | ) |
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348 | { |
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349 | POSIX_API_Control *api; |
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350 | int signo; |
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351 | ISR_Level level; |
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352 | |
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353 | api = the_thread->API_Extensions[ THREAD_API_POSIX ]; |
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354 | |
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355 | /* |
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356 | * If we invoke any user code, there is the possibility that |
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357 | * a new signal has been posted that we should process so we |
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358 | * restart the loop if a signal handler was invoked. |
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359 | * |
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360 | * The first thing done is to check there are any signals to be |
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361 | * processed at all. No point in doing this loop otherwise. |
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362 | */ |
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363 | |
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364 | restart: |
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365 | _ISR_Disable( level ); |
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366 | if ( !(~api->signals_blocked & |
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367 | (api->signals_pending | _POSIX_signals_Pending)) ) { |
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368 | _ISR_Enable( level ); |
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369 | return; |
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370 | } |
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371 | _ISR_Enable( level ); |
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372 | |
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373 | for ( signo = SIGRTMIN ; signo <= SIGRTMAX ; signo++ ) { |
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374 | |
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375 | if ( _POSIX_signals_Check_signal( api, signo, FALSE ) ) |
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376 | goto restart; |
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377 | |
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378 | if ( _POSIX_signals_Check_signal( api, signo, TRUE ) ) |
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379 | goto restart; |
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380 | |
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381 | } |
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382 | |
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383 | /* XXX - add __SIGFIRSTNOTRT or something like that to newlib siginfo.h */ |
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384 | |
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385 | for ( signo = SIGHUP ; signo <= __SIGLASTNOTRT ; signo++ ) { |
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386 | |
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387 | if ( _POSIX_signals_Check_signal( api, signo, FALSE ) ) |
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388 | goto restart; |
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389 | |
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390 | if ( _POSIX_signals_Check_signal( api, signo, TRUE ) ) |
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391 | goto restart; |
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392 | |
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393 | } |
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394 | |
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395 | } |
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396 | |
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397 | /*PAGE |
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398 | * |
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399 | * _POSIX_signals_Alarm_TSR |
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400 | */ |
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401 | |
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402 | void _POSIX_signals_Alarm_TSR( |
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403 | Objects_Id id, |
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404 | void *argument |
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405 | ) |
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406 | { |
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407 | int status; |
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408 | |
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409 | status = kill( getpid(), SIGALRM ); |
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410 | /* XXX can't print from an ISR, should this be fatal? */ |
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411 | assert( !status ); |
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412 | } |
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413 | |
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414 | /*PAGE |
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415 | * |
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416 | * _POSIX_signals_Manager_Initialization |
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417 | */ |
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418 | |
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419 | void _POSIX_signals_Manager_Initialization( |
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420 | int maximum_queued_signals |
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421 | ) |
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422 | { |
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423 | unsigned32 signo; |
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424 | |
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425 | /* |
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426 | * Insure we have the same number of vectors and default vector entries |
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427 | */ |
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428 | |
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429 | assert( |
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430 | sizeof(_POSIX_signals_Vectors) == sizeof(_POSIX_signals_Default_vectors) |
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431 | ); |
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432 | |
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433 | memcpy( |
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434 | _POSIX_signals_Vectors, |
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435 | _POSIX_signals_Default_vectors, |
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436 | sizeof( _POSIX_signals_Vectors ) |
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437 | ); |
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438 | |
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439 | /* |
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440 | * Initialize the set of pending signals for the entire process |
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441 | */ |
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442 | |
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443 | sigemptyset( &_POSIX_signals_Pending ); |
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444 | |
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445 | /* |
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446 | * Initialize the timer used to implement alarm(). |
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447 | */ |
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448 | |
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449 | _Watchdog_Initialize( |
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450 | &_POSIX_signals_Alarm_timer, |
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451 | _POSIX_signals_Alarm_TSR, |
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452 | 0, |
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453 | NULL |
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454 | ); |
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455 | |
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456 | /* |
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457 | * Initialize the queue we use to block for signals |
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458 | */ |
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459 | |
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460 | _Thread_queue_Initialize( |
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461 | &_POSIX_signals_Wait_queue, |
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462 | OBJECTS_NO_CLASS, |
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463 | THREAD_QUEUE_DISCIPLINE_PRIORITY, |
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464 | STATES_WAITING_FOR_SIGNAL | STATES_INTERRUPTIBLE_BY_SIGNAL, |
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465 | NULL, |
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466 | EAGAIN |
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467 | ); |
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468 | |
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469 | /* XXX status codes */ |
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470 | |
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471 | /* |
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472 | * Allocate the siginfo pools. |
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473 | */ |
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474 | |
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475 | for ( signo=1 ; signo<= SIGRTMAX ; signo++ ) |
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476 | _Chain_Initialize_empty( &_POSIX_signals_Siginfo[ signo ] ); |
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477 | |
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478 | _Chain_Initialize( |
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479 | &_POSIX_signals_Inactive_siginfo, |
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480 | _Workspace_Allocate_or_fatal_error( |
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481 | maximum_queued_signals * sizeof( POSIX_signals_Siginfo_node ) |
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482 | ), |
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483 | maximum_queued_signals, |
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484 | sizeof( POSIX_signals_Siginfo_node ) |
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485 | ); |
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486 | } |
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487 | |
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488 | /* |
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489 | * 3.3.3 Manipulate Signal Sets, P1003.1b-1993, p. 69 |
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490 | */ |
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491 | |
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492 | int sigemptyset( |
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493 | sigset_t *set |
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494 | ) |
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495 | { |
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496 | if ( !set ) |
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497 | set_errno_and_return_minus_one( EINVAL ); |
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498 | |
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499 | *set = 0; |
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500 | return 0; |
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501 | } |
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502 | |
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503 | /* |
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504 | * 3.3.3 Manipulate Signal Sets, P1003.1b-1993, p. 69 |
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505 | */ |
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506 | |
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507 | int sigfillset( |
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508 | sigset_t *set |
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509 | ) |
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510 | { |
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511 | if ( !set ) |
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512 | set_errno_and_return_minus_one( EINVAL ); |
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513 | |
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514 | *set = SIGNAL_ALL_MASK; |
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515 | return 0; |
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516 | } |
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517 | |
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518 | /* |
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519 | * 3.3.3 Manipulate Signal Sets, P1003.1b-1993, p. 69 |
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520 | */ |
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521 | |
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522 | int sigaddset( |
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523 | sigset_t *set, |
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524 | int signo |
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525 | ) |
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526 | { |
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527 | if ( !set ) |
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528 | set_errno_and_return_minus_one( EINVAL ); |
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529 | |
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530 | if ( !signo ) |
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531 | return 0; |
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532 | |
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533 | if ( !is_valid_signo(signo) ) |
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534 | set_errno_and_return_minus_one( EINVAL ); |
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535 | |
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536 | *set |= signo_to_mask(signo); |
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537 | return 0; |
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538 | } |
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539 | |
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540 | /* |
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541 | * 3.3.3 Manipulate Signal Sets, P1003.1b-1993, p. 69 |
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542 | */ |
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543 | |
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544 | int sigdelset( |
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545 | sigset_t *set, |
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546 | int signo |
---|
547 | ) |
---|
548 | { |
---|
549 | if ( !set ) |
---|
550 | set_errno_and_return_minus_one( EINVAL ); |
---|
551 | |
---|
552 | if ( !signo ) |
---|
553 | return 0; |
---|
554 | |
---|
555 | if ( !is_valid_signo(signo) ) |
---|
556 | set_errno_and_return_minus_one( EINVAL ); |
---|
557 | |
---|
558 | *set &= ~signo_to_mask(signo); |
---|
559 | return 0; |
---|
560 | } |
---|
561 | |
---|
562 | /* |
---|
563 | * 3.3.3 Manipulate Signal Sets, P1003.1b-1993, p. 69 |
---|
564 | */ |
---|
565 | |
---|
566 | int sigismember( |
---|
567 | const sigset_t *set, |
---|
568 | int signo |
---|
569 | ) |
---|
570 | { |
---|
571 | if ( !set ) |
---|
572 | set_errno_and_return_minus_one( EINVAL ); |
---|
573 | |
---|
574 | if ( !signo ) |
---|
575 | return 0; |
---|
576 | |
---|
577 | if ( !is_valid_signo(signo) ) |
---|
578 | set_errno_and_return_minus_one( EINVAL ); |
---|
579 | |
---|
580 | if ( *set & signo_to_mask(signo) ) |
---|
581 | return 1; |
---|
582 | |
---|
583 | return 0; |
---|
584 | } |
---|
585 | |
---|
586 | /* |
---|
587 | * 3.3.4 Examine and Change Signal Action, P1003.1b-1993, p. 70 |
---|
588 | */ |
---|
589 | |
---|
590 | int sigaction( |
---|
591 | int sig, |
---|
592 | const struct sigaction *act, |
---|
593 | struct sigaction *oact |
---|
594 | ) |
---|
595 | { |
---|
596 | ISR_Level level; |
---|
597 | |
---|
598 | if ( oact ) |
---|
599 | *oact = _POSIX_signals_Vectors[ sig ]; |
---|
600 | |
---|
601 | if ( !sig ) |
---|
602 | return 0; |
---|
603 | |
---|
604 | if ( !is_valid_signo(sig) ) |
---|
605 | set_errno_and_return_minus_one( EINVAL ); |
---|
606 | |
---|
607 | /* |
---|
608 | * Some signals cannot be ignored (P1003.1b-1993, pp. 70-72 and references. |
---|
609 | * |
---|
610 | * NOTE: Solaris documentation claims to "silently enforce" this which |
---|
611 | * contradicts the POSIX specification. |
---|
612 | */ |
---|
613 | |
---|
614 | if ( sig == SIGKILL ) |
---|
615 | set_errno_and_return_minus_one( EINVAL ); |
---|
616 | |
---|
617 | /* |
---|
618 | * Evaluate the new action structure and set the global signal vector |
---|
619 | * appropriately. |
---|
620 | */ |
---|
621 | |
---|
622 | if ( act ) { |
---|
623 | |
---|
624 | /* |
---|
625 | * Unless the user is installing the default signal actions, then |
---|
626 | * we can just copy the provided sigaction structure into the vectors. |
---|
627 | */ |
---|
628 | |
---|
629 | _ISR_Disable( level ); |
---|
630 | if ( act->sa_handler == SIG_DFL ) { |
---|
631 | _POSIX_signals_Vectors[ sig ] = _POSIX_signals_Default_vectors[ sig ]; |
---|
632 | } else { |
---|
633 | _POSIX_signals_Clear_process_signals( signo_to_mask(sig) ); |
---|
634 | _POSIX_signals_Vectors[ sig ] = *act; |
---|
635 | } |
---|
636 | _ISR_Enable( level ); |
---|
637 | } |
---|
638 | |
---|
639 | /* |
---|
640 | * No need to evaluate or dispatch because: |
---|
641 | * |
---|
642 | * + If we were ignoring the signal before, none could be pending |
---|
643 | * now (signals not posted when SIG_IGN). |
---|
644 | * + If we are now ignoring a signal that was previously pending, |
---|
645 | * we clear the pending signal indicator. |
---|
646 | */ |
---|
647 | |
---|
648 | return 0; |
---|
649 | } |
---|
650 | |
---|
651 | /* |
---|
652 | * 3.3.5 Examine and Change Blocked Signals, P1003.1b-1993, p. 73 |
---|
653 | * |
---|
654 | * NOTE: P1003.1c/D10, p. 37 adds pthread_sigmask(). |
---|
655 | * |
---|
656 | */ |
---|
657 | |
---|
658 | int sigprocmask( |
---|
659 | int how, |
---|
660 | const sigset_t *set, |
---|
661 | sigset_t *oset |
---|
662 | ) |
---|
663 | { |
---|
664 | /* |
---|
665 | * P1003.1c/Draft 10, p. 38 maps sigprocmask to pthread_sigmask. |
---|
666 | */ |
---|
667 | |
---|
668 | return pthread_sigmask( how, set, oset ); |
---|
669 | } |
---|
670 | |
---|
671 | /* |
---|
672 | * 3.3.5 Examine and Change Blocked Signals, P1003.1b-1993, p. 73 |
---|
673 | * |
---|
674 | * NOTE: P1003.1c/D10, p. 37 adds pthread_sigmask(). |
---|
675 | */ |
---|
676 | |
---|
677 | int pthread_sigmask( |
---|
678 | int how, |
---|
679 | const sigset_t *set, |
---|
680 | sigset_t *oset |
---|
681 | ) |
---|
682 | { |
---|
683 | POSIX_API_Control *api; |
---|
684 | |
---|
685 | if ( !set && !oset ) |
---|
686 | set_errno_and_return_minus_one( EINVAL ); |
---|
687 | |
---|
688 | api = _Thread_Executing->API_Extensions[ THREAD_API_POSIX ]; |
---|
689 | |
---|
690 | if ( oset ) |
---|
691 | *oset = api->signals_blocked; |
---|
692 | |
---|
693 | if ( !set ) |
---|
694 | return 0; |
---|
695 | |
---|
696 | switch ( how ) { |
---|
697 | case SIG_BLOCK: |
---|
698 | api->signals_blocked |= *set; |
---|
699 | break; |
---|
700 | case SIG_UNBLOCK: |
---|
701 | api->signals_blocked &= ~*set; |
---|
702 | break; |
---|
703 | case SIG_SETMASK: |
---|
704 | api->signals_blocked = *set; |
---|
705 | break; |
---|
706 | default: |
---|
707 | set_errno_and_return_minus_one( EINVAL ); |
---|
708 | } |
---|
709 | |
---|
710 | /* XXX are there critical section problems here? */ |
---|
711 | |
---|
712 | /* XXX evaluate the new set */ |
---|
713 | |
---|
714 | if ( ~api->signals_blocked & |
---|
715 | (api->signals_pending | _POSIX_signals_Pending) ) { |
---|
716 | _Thread_Executing->do_post_task_switch_extension = TRUE; |
---|
717 | _Thread_Dispatch(); |
---|
718 | } |
---|
719 | |
---|
720 | return 0; |
---|
721 | } |
---|
722 | |
---|
723 | /* |
---|
724 | * 3.3.6 Examine Pending Signals, P1003.1b-1993, p. 75 |
---|
725 | */ |
---|
726 | |
---|
727 | int sigpending( |
---|
728 | sigset_t *set |
---|
729 | ) |
---|
730 | { |
---|
731 | POSIX_API_Control *api; |
---|
732 | |
---|
733 | if ( !set ) |
---|
734 | set_errno_and_return_minus_one( EINVAL ); |
---|
735 | |
---|
736 | api = _Thread_Executing->API_Extensions[ THREAD_API_POSIX ]; |
---|
737 | |
---|
738 | *set = api->signals_pending | _POSIX_signals_Pending; |
---|
739 | |
---|
740 | return 0; |
---|
741 | } |
---|
742 | |
---|
743 | /* |
---|
744 | * 3.3.7 Wait for a Signal, P1003.1b-1993, p. 75 |
---|
745 | */ |
---|
746 | |
---|
747 | int sigsuspend( |
---|
748 | const sigset_t *sigmask |
---|
749 | ) |
---|
750 | { |
---|
751 | sigset_t saved_signals_blocked; |
---|
752 | sigset_t all_signals; |
---|
753 | int status; |
---|
754 | POSIX_API_Control *api; |
---|
755 | |
---|
756 | api = _Thread_Executing->API_Extensions[ THREAD_API_POSIX ]; |
---|
757 | |
---|
758 | status = sigprocmask( SIG_BLOCK, sigmask, &saved_signals_blocked ); |
---|
759 | |
---|
760 | (void) sigfillset( &all_signals ); |
---|
761 | |
---|
762 | status = sigtimedwait( &all_signals, NULL, NULL ); |
---|
763 | |
---|
764 | (void) sigprocmask( SIG_SETMASK, &saved_signals_blocked, NULL ); |
---|
765 | |
---|
766 | return status; |
---|
767 | } |
---|
768 | |
---|
769 | /* |
---|
770 | * 3.3.8 Synchronously Accept a Signal, P1003.1b-1993, p. 76 |
---|
771 | * |
---|
772 | * NOTE: P1003.1c/D10, p. 39 adds sigwait(). |
---|
773 | */ |
---|
774 | |
---|
775 | int sigwaitinfo( |
---|
776 | const sigset_t *set, |
---|
777 | siginfo_t *info |
---|
778 | ) |
---|
779 | { |
---|
780 | return sigtimedwait( set, info, NULL ); |
---|
781 | } |
---|
782 | |
---|
783 | /* |
---|
784 | * 3.3.8 Synchronously Accept a Signal, P1003.1b-1993, p. 76 |
---|
785 | * |
---|
786 | * NOTE: P1003.1c/D10, p. 39 adds sigwait(). |
---|
787 | */ |
---|
788 | |
---|
789 | int _POSIX_signals_Get_highest( |
---|
790 | sigset_t set |
---|
791 | ) |
---|
792 | { |
---|
793 | int signo; |
---|
794 | |
---|
795 | for ( signo = SIGRTMIN ; signo <= SIGRTMAX ; signo++ ) { |
---|
796 | if ( set & signo_to_mask( signo ) ) |
---|
797 | return signo; |
---|
798 | } |
---|
799 | |
---|
800 | /* XXX - add __SIGFIRSTNOTRT or something like that to newlib siginfo.h */ |
---|
801 | |
---|
802 | for ( signo = SIGHUP ; signo <= __SIGLASTNOTRT ; signo++ ) { |
---|
803 | if ( set & signo_to_mask( signo ) ) |
---|
804 | return signo; |
---|
805 | } |
---|
806 | |
---|
807 | return 0; |
---|
808 | } |
---|
809 | |
---|
810 | int sigtimedwait( |
---|
811 | const sigset_t *set, |
---|
812 | siginfo_t *info, |
---|
813 | const struct timespec *timeout |
---|
814 | ) |
---|
815 | { |
---|
816 | Thread_Control *the_thread; |
---|
817 | POSIX_API_Control *api; |
---|
818 | Watchdog_Interval interval; |
---|
819 | siginfo_t signal_information; |
---|
820 | siginfo_t *the_info; |
---|
821 | int signo; |
---|
822 | |
---|
823 | the_info = ( info ) ? info : &signal_information; |
---|
824 | |
---|
825 | the_thread = _Thread_Executing; |
---|
826 | |
---|
827 | api = the_thread->API_Extensions[ THREAD_API_POSIX ]; |
---|
828 | |
---|
829 | /* |
---|
830 | * What if they are already pending? |
---|
831 | */ |
---|
832 | |
---|
833 | /* API signals pending? */ |
---|
834 | |
---|
835 | if ( *set & api->signals_pending ) { |
---|
836 | /* XXX real info later */ |
---|
837 | the_info->si_signo = _POSIX_signals_Get_highest( api->signals_pending ); |
---|
838 | _POSIX_signals_Clear_signals( api, the_info->si_signo, the_info, |
---|
839 | FALSE, FALSE ); |
---|
840 | the_info->si_code = SI_USER; |
---|
841 | the_info->si_value.sival_int = 0; |
---|
842 | return the_info->si_signo; |
---|
843 | } |
---|
844 | |
---|
845 | /* Process pending signals? */ |
---|
846 | |
---|
847 | if ( *set & _POSIX_signals_Pending) { |
---|
848 | signo = _POSIX_signals_Get_highest( _POSIX_signals_Pending ); |
---|
849 | _POSIX_signals_Clear_signals( api, signo, the_info, TRUE, FALSE ); |
---|
850 | |
---|
851 | if ( !info ) { |
---|
852 | the_info->si_signo = signo; |
---|
853 | the_info->si_code = SI_USER; |
---|
854 | the_info->si_value.sival_int = 0; |
---|
855 | } |
---|
856 | } |
---|
857 | |
---|
858 | interval = 0; |
---|
859 | if ( timeout ) { |
---|
860 | |
---|
861 | if (timeout->tv_nsec < 0 || timeout->tv_nsec >= TOD_NANOSECONDS_PER_SECOND) |
---|
862 | set_errno_and_return_minus_one( EINVAL ); |
---|
863 | |
---|
864 | interval = _POSIX_Timespec_to_interval( timeout ); |
---|
865 | } |
---|
866 | |
---|
867 | the_info->si_signo = -1; |
---|
868 | |
---|
869 | _Thread_Disable_dispatch(); |
---|
870 | the_thread->Wait.queue = &_POSIX_signals_Wait_queue; |
---|
871 | the_thread->Wait.return_code = EINTR; |
---|
872 | the_thread->Wait.option = *set; |
---|
873 | the_thread->Wait.return_argument = (void *) the_info; |
---|
874 | _Thread_queue_Enter_critical_section( &_POSIX_signals_Wait_queue ); |
---|
875 | _Thread_queue_Enqueue( &_POSIX_signals_Wait_queue, interval ); |
---|
876 | _Thread_Enable_dispatch(); |
---|
877 | |
---|
878 | errno = _Thread_Executing->Wait.return_code; |
---|
879 | return the_info->si_signo; |
---|
880 | } |
---|
881 | |
---|
882 | /* |
---|
883 | * 3.3.8 Synchronously Accept a Signal, P1003.1b-1993, p. 76 |
---|
884 | * |
---|
885 | * NOTE: P1003.1c/D10, p. 39 adds sigwait(). |
---|
886 | */ |
---|
887 | |
---|
888 | int sigwait( |
---|
889 | const sigset_t *set, |
---|
890 | int *sig |
---|
891 | ) |
---|
892 | { |
---|
893 | int status; |
---|
894 | |
---|
895 | status = sigtimedwait( set, NULL, NULL ); |
---|
896 | |
---|
897 | if ( status != -1 ) { |
---|
898 | if ( sig ) |
---|
899 | *sig = status; |
---|
900 | return 0; |
---|
901 | } |
---|
902 | |
---|
903 | return errno; |
---|
904 | } |
---|
905 | |
---|
906 | /*PAGE |
---|
907 | * |
---|
908 | * 3.3.2 Send a Signal to a Process, P1003.1b-1993, p. 68 |
---|
909 | * |
---|
910 | * NOTE: Behavior of kill() depends on _POSIX_SAVED_IDS. |
---|
911 | */ |
---|
912 | |
---|
913 | #define _POSIX_signals_Is_interested( _api, _mask ) \ |
---|
914 | ( ~(_api)->signals_blocked & (_mask) ) |
---|
915 | |
---|
916 | int killinfo( |
---|
917 | pid_t pid, |
---|
918 | int sig, |
---|
919 | const union sigval *value |
---|
920 | ) |
---|
921 | { |
---|
922 | sigset_t mask; |
---|
923 | POSIX_API_Control *api; |
---|
924 | unsigned32 the_class; |
---|
925 | unsigned32 index; |
---|
926 | unsigned32 maximum; |
---|
927 | Objects_Information *the_info; |
---|
928 | Objects_Control **object_table; |
---|
929 | Thread_Control *the_thread; |
---|
930 | Thread_Control *interested_thread; |
---|
931 | Priority_Control interested_priority; |
---|
932 | Chain_Control *the_chain; |
---|
933 | Chain_Node *the_node; |
---|
934 | siginfo_t siginfo_struct; |
---|
935 | siginfo_t *siginfo; |
---|
936 | POSIX_signals_Siginfo_node *psiginfo; |
---|
937 | |
---|
938 | /* |
---|
939 | * Only supported for the "calling process" (i.e. this node). |
---|
940 | */ |
---|
941 | |
---|
942 | if( pid != getpid() ) |
---|
943 | set_errno_and_return_minus_one( ESRCH ); |
---|
944 | |
---|
945 | /* |
---|
946 | * Validate the signal passed if not 0. |
---|
947 | */ |
---|
948 | |
---|
949 | if ( sig && !is_valid_signo(sig) ) |
---|
950 | set_errno_and_return_minus_one( EINVAL ); |
---|
951 | |
---|
952 | /* |
---|
953 | * If the signal is being ignored, then we are out of here. |
---|
954 | */ |
---|
955 | |
---|
956 | if ( !sig || _POSIX_signals_Vectors[ sig ].sa_handler == SIG_IGN ) |
---|
957 | return 0; |
---|
958 | |
---|
959 | /* |
---|
960 | * P1003.1c/Draft 10, p. 33 says that certain signals should always |
---|
961 | * be directed to the executing thread such as those caused by hardware |
---|
962 | * faults. |
---|
963 | */ |
---|
964 | |
---|
965 | switch ( sig ) { |
---|
966 | case SIGFPE: |
---|
967 | case SIGILL: |
---|
968 | case SIGSEGV: |
---|
969 | return pthread_kill( pthread_self(), sig ); |
---|
970 | default: |
---|
971 | break; |
---|
972 | } |
---|
973 | |
---|
974 | mask = signo_to_mask( sig ); |
---|
975 | |
---|
976 | /* |
---|
977 | * Build up a siginfo structure |
---|
978 | */ |
---|
979 | |
---|
980 | siginfo = &siginfo_struct; |
---|
981 | siginfo->si_signo = sig; |
---|
982 | siginfo->si_code = SI_USER; |
---|
983 | if ( !value ) { |
---|
984 | siginfo->si_value.sival_int = 0; |
---|
985 | } else { |
---|
986 | siginfo->si_value = *value; |
---|
987 | } |
---|
988 | |
---|
989 | _Thread_Disable_dispatch(); |
---|
990 | |
---|
991 | /* |
---|
992 | * Is the currently executing thread interested? If so then it will |
---|
993 | * get it an execute it as soon as the dispatcher executes. |
---|
994 | */ |
---|
995 | |
---|
996 | the_thread = _Thread_Executing; |
---|
997 | |
---|
998 | api = the_thread->API_Extensions[ THREAD_API_POSIX ]; |
---|
999 | if ( _POSIX_signals_Is_interested( api, mask ) ) { |
---|
1000 | goto process_it; |
---|
1001 | } |
---|
1002 | |
---|
1003 | /* |
---|
1004 | * Is an interested thread waiting for this signal (sigwait())? |
---|
1005 | */ |
---|
1006 | |
---|
1007 | /* XXX violation of visibility -- need to define thread queue support */ |
---|
1008 | |
---|
1009 | for( index=0 ; |
---|
1010 | index < TASK_QUEUE_DATA_NUMBER_OF_PRIORITY_HEADERS ; |
---|
1011 | index++ ) { |
---|
1012 | |
---|
1013 | the_chain = &_POSIX_signals_Wait_queue.Queues.Priority[ index ]; |
---|
1014 | |
---|
1015 | for ( the_node = the_chain->first ; |
---|
1016 | !_Chain_Is_tail( the_chain, the_node ) ; |
---|
1017 | the_node = the_node->next ) { |
---|
1018 | |
---|
1019 | the_thread = (Thread_Control *)the_node; |
---|
1020 | api = the_thread->API_Extensions[ THREAD_API_POSIX ]; |
---|
1021 | |
---|
1022 | if ((the_thread->Wait.option & mask) || (~api->signals_blocked & mask)) { |
---|
1023 | goto process_it; |
---|
1024 | } |
---|
1025 | |
---|
1026 | } |
---|
1027 | } |
---|
1028 | |
---|
1029 | /* |
---|
1030 | * Is any other thread interested? The highest priority interested |
---|
1031 | * thread is selected. In the event of a tie, then the following |
---|
1032 | * additional criteria is used: |
---|
1033 | * |
---|
1034 | * + ready thread over blocked |
---|
1035 | * + blocked on call interruptible by signal (can return EINTR) |
---|
1036 | * + blocked on call not interruptible by signal |
---|
1037 | * |
---|
1038 | * This looks at every thread in the system regardless of the creating API. |
---|
1039 | * |
---|
1040 | * NOTES: |
---|
1041 | * |
---|
1042 | * + rtems internal threads do not receive signals. |
---|
1043 | */ |
---|
1044 | |
---|
1045 | interested_thread = NULL; |
---|
1046 | interested_priority = PRIORITY_MAXIMUM + 1; |
---|
1047 | |
---|
1048 | for ( the_class = OBJECTS_CLASSES_FIRST_THREAD_CLASS; |
---|
1049 | the_class <= OBJECTS_CLASSES_LAST_THREAD_CLASS; |
---|
1050 | the_class++ ) { |
---|
1051 | |
---|
1052 | if ( the_class == OBJECTS_INTERNAL_THREADS ) |
---|
1053 | continue; |
---|
1054 | |
---|
1055 | the_info = _Objects_Information_table[ the_class ]; |
---|
1056 | |
---|
1057 | if ( !the_info ) /* manager not installed */ |
---|
1058 | continue; |
---|
1059 | |
---|
1060 | maximum = the_info->maximum; |
---|
1061 | object_table = the_info->local_table; |
---|
1062 | |
---|
1063 | assert( object_table ); /* always at least 1 entry */ |
---|
1064 | |
---|
1065 | for ( index = 1 ; index <= maximum ; index++ ) { |
---|
1066 | the_thread = (Thread_Control *) object_table[ index ]; |
---|
1067 | |
---|
1068 | if ( !the_thread ) |
---|
1069 | continue; |
---|
1070 | |
---|
1071 | /* |
---|
1072 | * If this thread is of lower priority than the interested thread, |
---|
1073 | * go on to the next thread. |
---|
1074 | */ |
---|
1075 | |
---|
1076 | if ( the_thread->current_priority > interested_priority ) |
---|
1077 | continue; |
---|
1078 | |
---|
1079 | /* |
---|
1080 | * If this thread is not interested, then go on to the next thread. |
---|
1081 | */ |
---|
1082 | |
---|
1083 | api = the_thread->API_Extensions[ THREAD_API_POSIX ]; |
---|
1084 | |
---|
1085 | if ( !api || !_POSIX_signals_Is_interested( api, mask ) ) |
---|
1086 | continue; |
---|
1087 | |
---|
1088 | /* |
---|
1089 | * Now we know the thread under connsideration is interested. |
---|
1090 | * If the thread under consideration is of higher priority, then |
---|
1091 | * it becomes the interested thread. |
---|
1092 | */ |
---|
1093 | |
---|
1094 | if ( the_thread->current_priority < interested_priority ) { |
---|
1095 | interested_thread = the_thread; |
---|
1096 | interested_priority = the_thread->current_priority; |
---|
1097 | continue; |
---|
1098 | } |
---|
1099 | |
---|
1100 | /* |
---|
1101 | * Now the thread and the interested thread have the same priority. |
---|
1102 | * If the interested thread is ready, then we don't need to send it |
---|
1103 | * to a blocked thread. |
---|
1104 | */ |
---|
1105 | |
---|
1106 | if ( _States_Is_ready( interested_thread->current_state ) ) |
---|
1107 | continue; |
---|
1108 | |
---|
1109 | /* |
---|
1110 | * Now the interested thread is blocked. |
---|
1111 | * If the thread we are considering is not, the it becomes the |
---|
1112 | * interested thread. |
---|
1113 | */ |
---|
1114 | |
---|
1115 | if ( _States_Is_ready( the_thread->current_state ) ) { |
---|
1116 | interested_thread = the_thread; |
---|
1117 | interested_priority = the_thread->current_priority; |
---|
1118 | continue; |
---|
1119 | } |
---|
1120 | |
---|
1121 | /* |
---|
1122 | * Now we know both threads are blocked. |
---|
1123 | * If the interested thread is interruptible, then just use it. |
---|
1124 | */ |
---|
1125 | |
---|
1126 | /* XXX need a new states macro */ |
---|
1127 | if ( interested_thread->current_state & STATES_INTERRUPTIBLE_BY_SIGNAL ) |
---|
1128 | continue; |
---|
1129 | |
---|
1130 | /* |
---|
1131 | * Now both threads are blocked and the interested thread is not |
---|
1132 | * interruptible. |
---|
1133 | * If the thread under consideration is interruptible by a signal, |
---|
1134 | * then it becomes the interested thread. |
---|
1135 | */ |
---|
1136 | |
---|
1137 | /* XXX need a new states macro */ |
---|
1138 | if ( the_thread->current_state & STATES_INTERRUPTIBLE_BY_SIGNAL ) { |
---|
1139 | interested_thread = the_thread; |
---|
1140 | interested_priority = the_thread->current_priority; |
---|
1141 | } |
---|
1142 | } |
---|
1143 | } |
---|
1144 | |
---|
1145 | if ( interested_thread ) { |
---|
1146 | the_thread = interested_thread; |
---|
1147 | goto process_it; |
---|
1148 | } |
---|
1149 | |
---|
1150 | /* |
---|
1151 | * OK so no threads were interested right now. It will be left on the |
---|
1152 | * global pending until a thread receives it. The global set of threads |
---|
1153 | * can change interest in this signal in one of the following ways: |
---|
1154 | * |
---|
1155 | * + a thread is created with the signal unblocked, |
---|
1156 | * + pthread_sigmask() unblocks the signal, |
---|
1157 | * + sigprocmask() unblocks the signal, OR |
---|
1158 | * + sigaction() which changes the handler to SIG_IGN. |
---|
1159 | */ |
---|
1160 | |
---|
1161 | the_thread = NULL; |
---|
1162 | goto post_process_signal; |
---|
1163 | |
---|
1164 | /* |
---|
1165 | * We found a thread which was interested, so now we mark that this |
---|
1166 | * thread needs to do the post context switch extension so it can |
---|
1167 | * evaluate the signals pending. |
---|
1168 | */ |
---|
1169 | |
---|
1170 | process_it: |
---|
1171 | |
---|
1172 | the_thread->do_post_task_switch_extension = TRUE; |
---|
1173 | |
---|
1174 | /* |
---|
1175 | * Returns TRUE if the signal was synchronously given to a thread |
---|
1176 | * blocked waiting for the signal. |
---|
1177 | */ |
---|
1178 | |
---|
1179 | if ( _POSIX_signals_Unblock_thread( the_thread, sig, siginfo ) ) { |
---|
1180 | _Thread_Enable_dispatch(); |
---|
1181 | return 0; |
---|
1182 | } |
---|
1183 | |
---|
1184 | post_process_signal: |
---|
1185 | |
---|
1186 | /* |
---|
1187 | * We may have woken up a thread but we definitely need to post the |
---|
1188 | * signal to the process wide information set. |
---|
1189 | */ |
---|
1190 | |
---|
1191 | _POSIX_signals_Set_process_signals( mask ); |
---|
1192 | |
---|
1193 | if ( _POSIX_signals_Vectors[ sig ].sa_flags == SA_SIGINFO ) { |
---|
1194 | |
---|
1195 | psiginfo = (POSIX_signals_Siginfo_node *) |
---|
1196 | _Chain_Get( &_POSIX_signals_Inactive_siginfo ); |
---|
1197 | if ( !psiginfo ) |
---|
1198 | set_errno_and_return_minus_one( EAGAIN ); |
---|
1199 | |
---|
1200 | psiginfo->Info = *siginfo; |
---|
1201 | |
---|
1202 | _Chain_Append( &_POSIX_signals_Siginfo[ sig ], &psiginfo->Node ); |
---|
1203 | } |
---|
1204 | |
---|
1205 | _Thread_Enable_dispatch(); |
---|
1206 | return 0; |
---|
1207 | } |
---|
1208 | |
---|
1209 | /*PAGE |
---|
1210 | * |
---|
1211 | * 3.3.2 Send a Signal to a Process, P1003.1b-1993, p. 68 |
---|
1212 | * |
---|
1213 | * NOTE: Behavior of kill() depends on _POSIX_SAVED_IDS. |
---|
1214 | */ |
---|
1215 | |
---|
1216 | int kill( |
---|
1217 | pid_t pid, |
---|
1218 | int sig |
---|
1219 | ) |
---|
1220 | { |
---|
1221 | return killinfo( pid, sig, NULL ); |
---|
1222 | } |
---|
1223 | |
---|
1224 | /* |
---|
1225 | * _kill_r |
---|
1226 | * |
---|
1227 | * This is the Newlib dependent reentrant version of kill(). |
---|
1228 | */ |
---|
1229 | |
---|
1230 | #if defined(RTEMS_NEWLIB) |
---|
1231 | |
---|
1232 | #include <reent.h> |
---|
1233 | |
---|
1234 | int _kill_r( |
---|
1235 | struct _reent *ptr, |
---|
1236 | pid_t pid, |
---|
1237 | int sig |
---|
1238 | ) |
---|
1239 | { |
---|
1240 | return kill( pid, sig ); |
---|
1241 | } |
---|
1242 | #endif |
---|
1243 | |
---|
1244 | /* |
---|
1245 | * 3.3.9 Queue a Signal to a Process, P1003.1b-1993, p. 78 |
---|
1246 | */ |
---|
1247 | |
---|
1248 | int sigqueue( |
---|
1249 | pid_t pid, |
---|
1250 | int signo, |
---|
1251 | const union sigval value |
---|
1252 | ) |
---|
1253 | { |
---|
1254 | return killinfo( pid, signo, &value ); |
---|
1255 | } |
---|
1256 | |
---|
1257 | /* |
---|
1258 | * 3.3.10 Send a Signal to a Thread, P1003.1c/D10, p. 43 |
---|
1259 | */ |
---|
1260 | |
---|
1261 | int pthread_kill( |
---|
1262 | pthread_t thread, |
---|
1263 | int sig |
---|
1264 | ) |
---|
1265 | { |
---|
1266 | POSIX_API_Control *api; |
---|
1267 | Thread_Control *the_thread; |
---|
1268 | Objects_Locations location; |
---|
1269 | |
---|
1270 | if ( sig && !is_valid_signo(sig) ) |
---|
1271 | set_errno_and_return_minus_one( EINVAL ); |
---|
1272 | |
---|
1273 | if ( _POSIX_signals_Vectors[ sig ].sa_flags == SA_SIGINFO ) |
---|
1274 | set_errno_and_return_minus_one( ENOSYS ); |
---|
1275 | |
---|
1276 | /* |
---|
1277 | * RTEMS does not support sending a siginfo signal to a specific thread. |
---|
1278 | */ |
---|
1279 | |
---|
1280 | the_thread = _POSIX_Threads_Get( thread, &location ); |
---|
1281 | switch ( location ) { |
---|
1282 | case OBJECTS_ERROR: |
---|
1283 | case OBJECTS_REMOTE: |
---|
1284 | set_errno_and_return_minus_one( ESRCH ); |
---|
1285 | case OBJECTS_LOCAL: |
---|
1286 | /* |
---|
1287 | * If sig == 0 then just validate arguments |
---|
1288 | */ |
---|
1289 | |
---|
1290 | api = the_thread->API_Extensions[ THREAD_API_POSIX ]; |
---|
1291 | |
---|
1292 | if ( sig ) { |
---|
1293 | |
---|
1294 | if ( _POSIX_signals_Vectors[ sig ].sa_handler == SIG_IGN ) { |
---|
1295 | _Thread_Enable_dispatch(); |
---|
1296 | return 0; |
---|
1297 | } |
---|
1298 | |
---|
1299 | /* XXX critical section */ |
---|
1300 | |
---|
1301 | api->signals_pending |= signo_to_mask( sig ); |
---|
1302 | |
---|
1303 | (void) _POSIX_signals_Unblock_thread( the_thread, sig, NULL ); |
---|
1304 | |
---|
1305 | the_thread->do_post_task_switch_extension = TRUE; |
---|
1306 | |
---|
1307 | if ( _ISR_Is_in_progress() && _Thread_Is_executing( the_thread ) ) |
---|
1308 | _ISR_Signals_to_thread_executing = TRUE; |
---|
1309 | } |
---|
1310 | _Thread_Enable_dispatch(); |
---|
1311 | return 0; |
---|
1312 | } |
---|
1313 | |
---|
1314 | return POSIX_BOTTOM_REACHED(); |
---|
1315 | } |
---|
1316 | |
---|
1317 | /* |
---|
1318 | * 3.4.1 Schedule Alarm, P1003.1b-1993, p. 79 |
---|
1319 | */ |
---|
1320 | |
---|
1321 | Watchdog_Control _POSIX_signals_Alarm_timer; |
---|
1322 | |
---|
1323 | unsigned int alarm( |
---|
1324 | unsigned int seconds |
---|
1325 | ) |
---|
1326 | { |
---|
1327 | unsigned int remaining = 0; |
---|
1328 | Watchdog_Control *the_timer; |
---|
1329 | |
---|
1330 | the_timer = &_POSIX_signals_Alarm_timer; |
---|
1331 | |
---|
1332 | switch ( _Watchdog_Remove( the_timer ) ) { |
---|
1333 | case WATCHDOG_INACTIVE: |
---|
1334 | case WATCHDOG_BEING_INSERTED: |
---|
1335 | break; |
---|
1336 | |
---|
1337 | case WATCHDOG_ACTIVE: |
---|
1338 | case WATCHDOG_REMOVE_IT: |
---|
1339 | remaining = the_timer->initial - |
---|
1340 | (the_timer->stop_time - the_timer->start_time); |
---|
1341 | break; |
---|
1342 | } |
---|
1343 | |
---|
1344 | _Watchdog_Insert_seconds( the_timer, seconds ); |
---|
1345 | |
---|
1346 | return remaining; |
---|
1347 | } |
---|
1348 | |
---|
1349 | /* |
---|
1350 | * 3.4.2 Suspend Process Execution, P1003.1b-1993, p. 81 |
---|
1351 | */ |
---|
1352 | |
---|
1353 | int pause( void ) |
---|
1354 | { |
---|
1355 | sigset_t all_signals; |
---|
1356 | int status; |
---|
1357 | |
---|
1358 | (void) sigfillset( &all_signals ); |
---|
1359 | |
---|
1360 | status = sigtimedwait( &all_signals, NULL, NULL ); |
---|
1361 | |
---|
1362 | return status; |
---|
1363 | } |
---|