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 | #include <stdio.h> |
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21 | |
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22 | |
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23 | /* |
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24 | * Currently 32 signals numbered 1-32 are defined |
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25 | */ |
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26 | |
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27 | #define SIGNAL_EMPTY_MASK 0x00000000 |
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28 | #define SIGNAL_ALL_MASK 0xffffffff |
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29 | |
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30 | #define signo_to_mask( _sig ) (1 << ((_sig) - 1)) |
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31 | |
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32 | #define is_valid_signo( _sig ) \ |
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33 | ((_sig) >= 1 && (_sig) <= 32 ) |
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34 | |
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35 | /*** PROCESS WIDE STUFF ****/ |
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36 | |
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37 | sigset_t _POSIX_signals_Pending; |
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38 | |
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39 | void _POSIX_signals_Abnormal_termination_handler( int signo ) |
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40 | { |
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41 | exit( 1 ); |
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42 | } |
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43 | |
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44 | #define SIG_ARRAY_MAX (SIGRTMAX + 1) |
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45 | struct sigaction _POSIX_signals_Default_vectors[ SIG_ARRAY_MAX ] = { |
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46 | /* NO SIGNAL 0 */ SIGACTION_IGNORE, |
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47 | /* SIGHUP 1 */ SIGACTION_TERMINATE, |
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48 | /* SIGINT 2 */ SIGACTION_TERMINATE, |
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49 | /* SIGQUIT 3 */ SIGACTION_TERMINATE, |
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50 | /* SIGILL 4 */ SIGACTION_TERMINATE, |
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51 | /* SIGTRAP 5 */ SIGACTION_TERMINATE, |
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52 | /* SIGIOT 6 */ SIGACTION_TERMINATE, |
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53 | /* SIGABRT 6 SIGACTION_TERMINATE, -- alias for SIGIOT */ |
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54 | /* SIGEMT 7 */ SIGACTION_TERMINATE, |
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55 | /* SIGFPE 8 */ SIGACTION_TERMINATE, |
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56 | /* SIGKILL 9 */ SIGACTION_TERMINATE, |
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57 | /* SIGBUS 10 */ SIGACTION_TERMINATE, |
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58 | /* SIGSEGV 11 */ SIGACTION_TERMINATE, |
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59 | /* SIGSYS 12 */ SIGACTION_TERMINATE, |
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60 | /* SIGPIPE 13 */ SIGACTION_TERMINATE, |
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61 | /* SIGALRM 14 */ SIGACTION_TERMINATE, |
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62 | /* SIGTERM 15 */ SIGACTION_TERMINATE, |
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63 | /* SIGUSR1 16 */ SIGACTION_TERMINATE, |
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64 | /* SIGUSR2 17 */ SIGACTION_TERMINATE, |
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65 | /* SIGRTMIN 18 */ SIGACTION_IGNORE, |
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66 | /* SIGRT 19 */ SIGACTION_IGNORE, |
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67 | /* SIGRT 20 */ SIGACTION_IGNORE, |
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68 | /* SIGRT 21 */ SIGACTION_IGNORE, |
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69 | /* SIGRT 22 */ SIGACTION_IGNORE, |
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70 | /* SIGRT 23 */ SIGACTION_IGNORE, |
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71 | /* SIGRT 24 */ SIGACTION_IGNORE, |
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72 | /* SIGRT 25 */ SIGACTION_IGNORE, |
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73 | /* SIGRT 26 */ SIGACTION_IGNORE, |
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74 | /* SIGRT 27 */ SIGACTION_IGNORE, |
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75 | /* SIGRT 28 */ SIGACTION_IGNORE, |
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76 | /* SIGRT 29 */ SIGACTION_IGNORE, |
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77 | /* SIGRT 30 */ SIGACTION_IGNORE, |
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78 | /* SIGRT 31 */ SIGACTION_IGNORE, |
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79 | /* SIGRTMAX 32 */ SIGACTION_IGNORE |
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80 | }; |
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81 | |
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82 | struct sigaction _POSIX_signals_Vectors[ SIG_ARRAY_MAX ]; |
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83 | |
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84 | Watchdog_Control _POSIX_signals_Alarm_timer; |
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85 | |
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86 | Thread_queue_Control _POSIX_signals_Wait_queue; |
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87 | |
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88 | Chain_Control _POSIX_signals_Inactive_siginfo; |
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89 | Chain_Control _POSIX_signals_Siginfo[ SIG_ARRAY_MAX ]; |
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90 | |
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91 | /*PAGE |
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92 | * |
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93 | * XXX - move these |
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94 | */ |
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95 | |
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96 | #define _States_Is_interruptible_signal( _states ) \ |
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97 | ( ((_states) & \ |
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98 | (STATES_WAITING_FOR_SIGNAL|STATES_INTERRUPTIBLE_BY_SIGNAL)) == \ |
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99 | (STATES_WAITING_FOR_SIGNAL|STATES_INTERRUPTIBLE_BY_SIGNAL)) |
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100 | |
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101 | /*PAGE |
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102 | * |
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103 | * _POSIX_signals_Unblock_thread |
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104 | */ |
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105 | |
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106 | /* XXX this routine could probably be cleaned up */ |
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107 | boolean _POSIX_signals_Unblock_thread( |
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108 | Thread_Control *the_thread, |
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109 | int signo, |
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110 | siginfo_t *info |
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111 | ) |
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112 | { |
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113 | POSIX_API_Control *api; |
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114 | sigset_t mask; |
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115 | siginfo_t *the_info = NULL; |
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116 | |
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117 | api = the_thread->API_Extensions[ THREAD_API_POSIX ]; |
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118 | |
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119 | mask = signo_to_mask( signo ); |
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120 | |
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121 | /* |
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122 | * Is the thread is specifically waiting for a signal? |
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123 | */ |
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124 | |
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125 | if ( _States_Is_interruptible_signal( the_thread->current_state ) ) { |
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126 | |
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127 | if ( (the_thread->Wait.option & mask) || (~api->signals_blocked & mask) ) { |
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128 | the_thread->Wait.return_code = EINTR; |
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129 | |
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130 | the_info = (siginfo_t *) the_thread->Wait.return_argument; |
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131 | |
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132 | if ( !info ) { |
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133 | the_info->si_signo = signo; |
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134 | the_info->si_code = SI_USER; |
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135 | the_info->si_value.sival_int = 0; |
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136 | } else { |
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137 | *the_info = *info; |
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138 | } |
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139 | |
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140 | _Thread_queue_Extract_with_proxy( the_thread ); |
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141 | return TRUE; |
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142 | } |
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143 | |
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144 | /* |
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145 | * This should only be reached via pthread_kill(). |
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146 | */ |
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147 | |
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148 | return FALSE; |
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149 | } |
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150 | |
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151 | if ( ~api->signals_blocked & mask ) { |
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152 | the_thread->do_post_task_switch_extension = TRUE; |
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153 | |
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154 | if ( the_thread->current_state & STATES_INTERRUPTIBLE_BY_SIGNAL ) { |
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155 | the_thread->Wait.return_code = EINTR; |
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156 | if ( _States_Is_waiting_on_thread_queue(the_thread->current_state) ) |
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157 | _Thread_queue_Extract_with_proxy( the_thread ); |
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158 | else if ( _States_Is_delaying(the_thread->current_state)){ |
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159 | if ( _Watchdog_Is_active( &the_thread->Timer ) ) |
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160 | (void) _Watchdog_Remove( &the_thread->Timer ); |
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161 | _Thread_Unblock( the_thread ); |
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162 | } |
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163 | } |
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164 | } |
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165 | return FALSE; |
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166 | |
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167 | } |
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168 | |
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169 | /*PAGE |
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170 | * |
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171 | * _POSIX_signals_Set_process_signals |
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172 | */ |
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173 | |
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174 | void _POSIX_signals_Set_process_signals( |
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175 | sigset_t mask |
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176 | ) |
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177 | { |
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178 | ISR_Level level; |
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179 | |
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180 | _ISR_Disable( level ); |
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181 | if ( !_POSIX_signals_Pending ) |
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182 | _Thread_Do_post_task_switch_extension++; |
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183 | _POSIX_signals_Pending |= mask; |
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184 | _ISR_Enable( level ); |
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185 | } |
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186 | |
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187 | /*PAGE |
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188 | * |
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189 | * _POSIX_signals_Clear_process_signals |
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190 | */ |
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191 | |
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192 | void _POSIX_signals_Clear_process_signals( |
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193 | sigset_t mask |
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194 | ) |
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195 | { |
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196 | ISR_Level level; |
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197 | |
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198 | _ISR_Disable( level ); |
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199 | _POSIX_signals_Pending &= ~mask; |
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200 | if ( !_POSIX_signals_Pending ) |
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201 | _Thread_Do_post_task_switch_extension--; |
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202 | _ISR_Enable( level ); |
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203 | } |
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204 | |
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205 | /*PAGE |
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206 | * |
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207 | * _POSIX_signals_Clear_signals |
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208 | */ |
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209 | |
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210 | boolean _POSIX_signals_Clear_signals( |
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211 | POSIX_API_Control *api, |
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212 | int signo, |
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213 | siginfo_t *info, |
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214 | boolean is_global, |
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215 | boolean check_blocked |
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216 | ) |
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217 | { |
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218 | sigset_t mask; |
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219 | sigset_t signals_blocked; |
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220 | ISR_Level level; |
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221 | boolean do_callout; |
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222 | POSIX_signals_Siginfo_node *psiginfo; |
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223 | |
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224 | mask = signo_to_mask( signo ); |
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225 | |
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226 | do_callout = FALSE; |
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227 | |
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228 | /* set blocked signals based on if checking for them, SIGNAL_ALL_MASK |
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229 | * insures that no signals are blocked and all are checked. |
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230 | */ |
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231 | |
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232 | if ( check_blocked ) |
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233 | signals_blocked = ~api->signals_blocked; |
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234 | else |
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235 | signals_blocked = SIGNAL_ALL_MASK; |
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236 | |
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237 | /* XXX this is not right for siginfo type signals yet */ |
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238 | /* XXX since they can't be cleared the same way */ |
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239 | |
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240 | _ISR_Disable( level ); |
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241 | if ( is_global ) { |
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242 | if ( mask & (_POSIX_signals_Pending & signals_blocked) ) { |
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243 | if ( _POSIX_signals_Vectors[ signo ].sa_flags == SA_SIGINFO ) { |
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244 | psiginfo = (POSIX_signals_Siginfo_node *) |
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245 | _Chain_Get_unprotected( &_POSIX_signals_Siginfo[ signo ] ); |
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246 | if ( _Chain_Is_empty( &_POSIX_signals_Siginfo[ signo ] ) ) |
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247 | _POSIX_signals_Clear_process_signals( mask ); |
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248 | if ( psiginfo ) { |
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249 | *info = psiginfo->Info; |
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250 | _Chain_Append_unprotected( |
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251 | &_POSIX_signals_Inactive_siginfo, |
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252 | &psiginfo->Node |
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253 | ); |
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254 | } else |
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255 | do_callout = FALSE; |
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256 | } else |
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257 | _POSIX_signals_Clear_process_signals( mask ); |
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258 | do_callout = TRUE; |
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259 | } |
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260 | } else { |
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261 | if ( mask & (api->signals_pending & signals_blocked) ) { |
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262 | api->signals_pending &= ~mask; |
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263 | do_callout = TRUE; |
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264 | } |
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265 | } |
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266 | _ISR_Enable( level ); |
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267 | return do_callout; |
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268 | } |
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269 | |
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270 | |
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271 | /*PAGE |
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272 | * |
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273 | * _POSIX_signals_Check_signal |
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274 | */ |
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275 | |
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276 | boolean _POSIX_signals_Check_signal( |
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277 | POSIX_API_Control *api, |
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278 | int signo, |
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279 | boolean is_global |
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280 | ) |
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281 | { |
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282 | siginfo_t siginfo_struct; |
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283 | sigset_t saved_signals_blocked; |
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284 | |
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285 | if ( ! _POSIX_signals_Clear_signals( api, signo, &siginfo_struct, |
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286 | is_global, TRUE ) ) |
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287 | return FALSE; |
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288 | |
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289 | /* |
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290 | * Since we made a union of these, only one test is necessary but this is |
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291 | * safer. |
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292 | */ |
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293 | |
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294 | assert( _POSIX_signals_Vectors[ signo ].sa_handler || |
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295 | _POSIX_signals_Vectors[ signo ].sa_sigaction ); |
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296 | |
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297 | /* |
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298 | * Just to prevent sending a signal which is currently being ignored. |
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299 | */ |
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300 | |
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301 | if ( _POSIX_signals_Vectors[ signo ].sa_handler == SIG_IGN ) |
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302 | return FALSE; |
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303 | |
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304 | /* |
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305 | * Block the signals requested in sa_mask |
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306 | */ |
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307 | |
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308 | saved_signals_blocked = api->signals_blocked; |
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309 | api->signals_blocked |= _POSIX_signals_Vectors[ signo ].sa_mask; |
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310 | |
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311 | /* Here, the signal handler function executes */ |
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312 | |
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313 | switch ( _POSIX_signals_Vectors[ signo ].sa_flags ) { |
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314 | case SA_SIGINFO: |
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315 | /* |
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316 | * |
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317 | * assert( is_global ); |
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318 | */ |
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319 | (*_POSIX_signals_Vectors[ signo ].sa_sigaction)( |
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320 | signo, |
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321 | &siginfo_struct, |
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322 | NULL /* context is undefined per 1003.1b-1993, p. 66 */ |
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323 | ); |
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324 | break; |
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325 | default: |
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326 | (*_POSIX_signals_Vectors[ signo ].sa_handler)( signo ); |
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327 | break; |
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328 | } |
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329 | |
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330 | /* |
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331 | * Restore the previous set of blocked signals |
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332 | */ |
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333 | |
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334 | api->signals_blocked = saved_signals_blocked; |
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335 | |
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336 | return TRUE; |
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337 | } |
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338 | |
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339 | void _POSIX_signals_Post_switch_extension( |
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340 | Thread_Control *the_thread |
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341 | ) |
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342 | { |
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343 | POSIX_API_Control *api; |
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344 | int signo; |
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345 | ISR_Level level; |
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346 | |
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347 | api = the_thread->API_Extensions[ THREAD_API_POSIX ]; |
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348 | |
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349 | /* |
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350 | * If we invoke any user code, there is the possibility that |
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351 | * a new signal has been posted that we should process so we |
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352 | * restart the loop if a signal handler was invoked. |
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353 | * |
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354 | * The first thing done is to check there are any signals to be |
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355 | * processed at all. No point in doing this loop otherwise. |
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356 | */ |
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357 | |
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358 | restart: |
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359 | _ISR_Disable( level ); |
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360 | if ( !(~api->signals_blocked & |
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361 | (api->signals_pending | _POSIX_signals_Pending)) ) { |
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362 | _ISR_Enable( level ); |
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363 | return; |
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364 | } |
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365 | _ISR_Enable( level ); |
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366 | |
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367 | for ( signo = SIGRTMIN ; signo <= SIGRTMAX ; signo++ ) { |
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368 | |
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369 | if ( _POSIX_signals_Check_signal( api, signo, FALSE ) ) |
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370 | goto restart; |
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371 | |
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372 | if ( _POSIX_signals_Check_signal( api, signo, TRUE ) ) |
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373 | goto restart; |
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374 | |
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375 | } |
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376 | |
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377 | /* XXX - add __SIGFIRSTNOTRT or something like that to newlib siginfo.h */ |
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378 | |
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379 | for ( signo = SIGHUP ; signo <= __SIGLASTNOTRT ; signo++ ) { |
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380 | |
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381 | if ( _POSIX_signals_Check_signal( api, signo, FALSE ) ) |
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382 | goto restart; |
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383 | |
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384 | if ( _POSIX_signals_Check_signal( api, signo, TRUE ) ) |
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385 | goto restart; |
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386 | |
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387 | } |
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388 | |
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389 | } |
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390 | |
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391 | /*PAGE |
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392 | * |
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393 | * _POSIX_signals_Alarm_TSR |
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394 | */ |
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395 | |
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396 | void _POSIX_signals_Alarm_TSR( |
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397 | Objects_Id id, |
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398 | void *argument |
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399 | ) |
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400 | { |
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401 | int status; |
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402 | |
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403 | status = kill( getpid(), SIGALRM ); |
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404 | /* XXX can't print from an ISR, should this be fatal? */ |
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405 | assert( !status ); |
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406 | } |
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407 | |
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408 | /*PAGE |
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409 | * |
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410 | * _POSIX_signals_Manager_Initialization |
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411 | */ |
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412 | |
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413 | void _POSIX_signals_Manager_Initialization( |
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414 | int maximum_queued_signals |
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415 | ) |
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416 | { |
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417 | unsigned32 signo; |
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418 | |
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419 | /* |
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420 | * Insure we have the same number of vectors and default vector entries |
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421 | */ |
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422 | |
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423 | assert( |
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424 | sizeof(_POSIX_signals_Vectors) == sizeof(_POSIX_signals_Default_vectors) |
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425 | ); |
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426 | |
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427 | memcpy( |
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428 | _POSIX_signals_Vectors, |
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429 | _POSIX_signals_Default_vectors, |
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430 | sizeof( _POSIX_signals_Vectors ) |
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431 | ); |
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432 | |
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433 | /* |
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434 | * Initialize the set of pending signals for the entire process |
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435 | */ |
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436 | |
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437 | sigemptyset( &_POSIX_signals_Pending ); |
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438 | |
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439 | /* |
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440 | * Initialize the timer used to implement alarm(). |
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441 | */ |
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442 | |
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443 | _Watchdog_Initialize( |
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444 | &_POSIX_signals_Alarm_timer, |
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445 | _POSIX_signals_Alarm_TSR, |
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446 | 0, |
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447 | NULL |
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448 | ); |
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449 | |
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450 | /* |
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451 | * Initialize the queue we use to block for signals |
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452 | */ |
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453 | |
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454 | _Thread_queue_Initialize( |
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455 | &_POSIX_signals_Wait_queue, |
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456 | OBJECTS_NO_CLASS, |
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457 | THREAD_QUEUE_DISCIPLINE_PRIORITY, |
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458 | STATES_WAITING_FOR_SIGNAL | STATES_INTERRUPTIBLE_BY_SIGNAL, |
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459 | NULL, |
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460 | EAGAIN |
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461 | ); |
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462 | |
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463 | /* XXX status codes */ |
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464 | |
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465 | /* |
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466 | * Allocate the siginfo pools. |
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467 | */ |
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468 | |
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469 | for ( signo=1 ; signo<= SIGRTMAX ; signo++ ) |
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470 | _Chain_Initialize_empty( &_POSIX_signals_Siginfo[ signo ] ); |
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471 | |
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472 | _Chain_Initialize( |
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473 | &_POSIX_signals_Inactive_siginfo, |
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474 | _Workspace_Allocate_or_fatal_error( |
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475 | maximum_queued_signals * sizeof( POSIX_signals_Siginfo_node ) |
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476 | ), |
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477 | maximum_queued_signals, |
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478 | sizeof( POSIX_signals_Siginfo_node ) |
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479 | ); |
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480 | } |
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481 | |
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482 | /* |
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483 | * 3.3.3 Manipulate Signal Sets, P1003.1b-1993, p. 69 |
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484 | */ |
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485 | |
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486 | int sigemptyset( |
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487 | sigset_t *set |
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488 | ) |
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489 | { |
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490 | if ( !set ) |
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491 | set_errno_and_return_minus_one( EINVAL ); |
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492 | |
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493 | *set = 0; |
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494 | return 0; |
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495 | } |
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496 | |
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497 | /* |
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498 | * 3.3.3 Manipulate Signal Sets, P1003.1b-1993, p. 69 |
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499 | */ |
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500 | |
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501 | int sigfillset( |
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502 | sigset_t *set |
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503 | ) |
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504 | { |
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505 | if ( !set ) |
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506 | set_errno_and_return_minus_one( EINVAL ); |
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507 | |
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508 | *set = SIGNAL_ALL_MASK; |
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509 | return 0; |
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510 | } |
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511 | |
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512 | /* |
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513 | * 3.3.3 Manipulate Signal Sets, P1003.1b-1993, p. 69 |
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514 | */ |
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515 | |
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516 | int sigaddset( |
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517 | sigset_t *set, |
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518 | int signo |
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519 | ) |
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520 | { |
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521 | if ( !set ) |
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522 | set_errno_and_return_minus_one( EINVAL ); |
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523 | |
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524 | if ( !signo ) |
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525 | return 0; |
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526 | |
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527 | if ( !is_valid_signo(signo) ) |
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528 | set_errno_and_return_minus_one( EINVAL ); |
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529 | |
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530 | *set |= signo_to_mask(signo); |
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531 | return 0; |
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532 | } |
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533 | |
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534 | /* |
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535 | * 3.3.3 Manipulate Signal Sets, P1003.1b-1993, p. 69 |
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536 | */ |
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537 | |
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538 | int sigdelset( |
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539 | sigset_t *set, |
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540 | int signo |
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541 | ) |
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542 | { |
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543 | if ( !set ) |
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544 | set_errno_and_return_minus_one( EINVAL ); |
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545 | |
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546 | if ( !signo ) |
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547 | return 0; |
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548 | |
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549 | if ( !is_valid_signo(signo) ) |
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550 | set_errno_and_return_minus_one( EINVAL ); |
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551 | |
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552 | *set &= ~signo_to_mask(signo); |
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553 | return 0; |
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554 | } |
---|
555 | |
---|
556 | /* |
---|
557 | * 3.3.3 Manipulate Signal Sets, P1003.1b-1993, p. 69 |
---|
558 | */ |
---|
559 | |
---|
560 | int sigismember( |
---|
561 | const sigset_t *set, |
---|
562 | int signo |
---|
563 | ) |
---|
564 | { |
---|
565 | if ( !set ) |
---|
566 | set_errno_and_return_minus_one( EINVAL ); |
---|
567 | |
---|
568 | if ( !signo ) |
---|
569 | return 0; |
---|
570 | |
---|
571 | if ( !is_valid_signo(signo) ) |
---|
572 | set_errno_and_return_minus_one( EINVAL ); |
---|
573 | |
---|
574 | if ( *set & signo_to_mask(signo) ) |
---|
575 | return 1; |
---|
576 | |
---|
577 | return 0; |
---|
578 | } |
---|
579 | |
---|
580 | /* |
---|
581 | * 3.3.4 Examine and Change Signal Action, P1003.1b-1993, p. 70 |
---|
582 | */ |
---|
583 | |
---|
584 | /* *************************************************************************** |
---|
585 | * The signal handler is notified to the timers manager when the |
---|
586 | * timer is set. So, the timers manager knows the signal handler. |
---|
587 | * ***************************************************************************/ |
---|
588 | |
---|
589 | int sigaction( |
---|
590 | int sig, |
---|
591 | const struct sigaction *act, |
---|
592 | struct sigaction *oact |
---|
593 | ) |
---|
594 | { |
---|
595 | ISR_Level level; |
---|
596 | |
---|
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 | /* |
---|
879 | * When the thread set free by a signal, it is needed to eliminate |
---|
880 | * that signal |
---|
881 | */ |
---|
882 | |
---|
883 | _POSIX_signals_Clear_signals( api, the_info->si_signo, the_info, |
---|
884 | FALSE, FALSE ); |
---|
885 | |
---|
886 | errno = _Thread_Executing->Wait.return_code; |
---|
887 | return the_info->si_signo; |
---|
888 | } |
---|
889 | |
---|
890 | /* |
---|
891 | * 3.3.8 Synchronously Accept a Signal, P1003.1b-1993, p. 76 |
---|
892 | * |
---|
893 | * NOTE: P1003.1c/D10, p. 39 adds sigwait(). |
---|
894 | */ |
---|
895 | |
---|
896 | int sigwait( |
---|
897 | const sigset_t *set, |
---|
898 | int *sig |
---|
899 | ) |
---|
900 | { |
---|
901 | int status; |
---|
902 | |
---|
903 | status = sigtimedwait( set, NULL, NULL ); |
---|
904 | |
---|
905 | if ( status != -1 ) { |
---|
906 | if ( sig ) |
---|
907 | *sig = status; |
---|
908 | return 0; |
---|
909 | } |
---|
910 | |
---|
911 | return errno; |
---|
912 | } |
---|
913 | |
---|
914 | /* |
---|
915 | * 3.3.9 Queue a Signal to a Process, P1003.1b-1993, p. 78 |
---|
916 | */ |
---|
917 | |
---|
918 | int sigqueue( |
---|
919 | pid_t pid, |
---|
920 | int signo, |
---|
921 | const union sigval value |
---|
922 | ) |
---|
923 | { |
---|
924 | return killinfo( pid, signo, &value ); |
---|
925 | } |
---|
926 | |
---|
927 | /* |
---|
928 | * 3.3.10 Send a Signal to a Thread, P1003.1c/D10, p. 43 |
---|
929 | */ |
---|
930 | |
---|
931 | int pthread_kill( |
---|
932 | pthread_t thread, |
---|
933 | int sig |
---|
934 | ) |
---|
935 | { |
---|
936 | POSIX_API_Control *api; |
---|
937 | Thread_Control *the_thread; |
---|
938 | Objects_Locations location; |
---|
939 | |
---|
940 | if ( sig && !is_valid_signo(sig) ) |
---|
941 | set_errno_and_return_minus_one( EINVAL ); |
---|
942 | /* |
---|
943 | if ( _POSIX_signals_Vectors[ sig ].sa_flags == SA_SIGINFO ) |
---|
944 | set_errno_and_return_minus_one( ENOSYS ); |
---|
945 | */ |
---|
946 | /* |
---|
947 | * RTEMS does not support sending a siginfo signal to a specific thread. |
---|
948 | */ |
---|
949 | |
---|
950 | the_thread = _POSIX_Threads_Get( thread, &location ); |
---|
951 | switch ( location ) { |
---|
952 | case OBJECTS_ERROR: |
---|
953 | case OBJECTS_REMOTE: |
---|
954 | set_errno_and_return_minus_one( ESRCH ); |
---|
955 | case OBJECTS_LOCAL: |
---|
956 | /* |
---|
957 | * If sig == 0 then just validate arguments |
---|
958 | */ |
---|
959 | |
---|
960 | api = the_thread->API_Extensions[ THREAD_API_POSIX ]; |
---|
961 | |
---|
962 | if ( sig ) { |
---|
963 | |
---|
964 | if ( _POSIX_signals_Vectors[ sig ].sa_handler == SIG_IGN ) { |
---|
965 | _Thread_Enable_dispatch(); |
---|
966 | return 0; |
---|
967 | } |
---|
968 | |
---|
969 | /* XXX critical section */ |
---|
970 | |
---|
971 | api->signals_pending |= signo_to_mask( sig ); |
---|
972 | |
---|
973 | (void) _POSIX_signals_Unblock_thread( the_thread, sig, NULL ); |
---|
974 | |
---|
975 | the_thread->do_post_task_switch_extension = TRUE; |
---|
976 | |
---|
977 | if ( _ISR_Is_in_progress() && _Thread_Is_executing( the_thread ) ) |
---|
978 | _ISR_Signals_to_thread_executing = TRUE; |
---|
979 | } |
---|
980 | _Thread_Enable_dispatch(); |
---|
981 | return 0; |
---|
982 | } |
---|
983 | |
---|
984 | return POSIX_BOTTOM_REACHED(); |
---|
985 | } |
---|