[7f72217e] | 1 | /* |
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[eb5a7e07] | 2 | * $Id$ |
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[5e9b32b] | 3 | */ |
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| 4 | |
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[e72d995a] | 5 | #include <assert.h> |
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| 6 | #include <errno.h> |
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[ea1a5bef] | 7 | #include <pthread.h> |
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[5e9b32b] | 8 | #include <signal.h> |
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| 9 | |
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[f4719d5a] | 10 | #include <rtems/system.h> |
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[fdec30b] | 11 | #include <rtems/score/isr.h> |
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[5e9b32b] | 12 | #include <rtems/score/thread.h> |
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[2291b71] | 13 | #include <rtems/score/tqdata.h> |
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[c53cfd0f] | 14 | #include <rtems/score/wkspace.h> |
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[895efd9] | 15 | #include <rtems/posix/seterr.h> |
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| 16 | #include <rtems/posix/threadsup.h> |
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[20fff72] | 17 | #include <rtems/posix/psignal.h> |
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[fdec30b] | 18 | #include <rtems/posix/pthread.h> |
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[2291b71] | 19 | #include <rtems/posix/time.h> |
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[5e9b32b] | 20 | |
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[895efd9] | 21 | /*** PROCESS WIDE STUFF ****/ |
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| 22 | |
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[fdec30b] | 23 | sigset_t _POSIX_signals_Pending; |
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| 24 | |
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[07d880f4] | 25 | struct sigaction _POSIX_signals_Vectors[ SIG_ARRAY_MAX ]; |
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[ea1a5bef] | 26 | |
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[07d880f4] | 27 | Watchdog_Control _POSIX_signals_Alarm_timer; |
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[fdec30b] | 28 | |
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[07d880f4] | 29 | Thread_queue_Control _POSIX_signals_Wait_queue; |
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| 30 | |
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| 31 | Chain_Control _POSIX_signals_Inactive_siginfo; |
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| 32 | Chain_Control _POSIX_signals_Siginfo[ SIG_ARRAY_MAX ]; |
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[fdec30b] | 33 | |
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| 34 | struct sigaction _POSIX_signals_Default_vectors[ SIG_ARRAY_MAX ] = { |
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| 35 | /* NO SIGNAL 0 */ SIGACTION_IGNORE, |
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[adae080a] | 36 | /* SIGHUP 1 */ SIGACTION_TERMINATE, |
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| 37 | /* SIGINT 2 */ SIGACTION_TERMINATE, |
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| 38 | /* SIGQUIT 3 */ SIGACTION_TERMINATE, |
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| 39 | /* SIGILL 4 */ SIGACTION_TERMINATE, |
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| 40 | /* SIGTRAP 5 */ SIGACTION_TERMINATE, |
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| 41 | /* SIGIOT 6 */ SIGACTION_TERMINATE, |
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| 42 | /* SIGABRT 6 SIGACTION_TERMINATE, -- alias for SIGIOT */ |
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| 43 | /* SIGEMT 7 */ SIGACTION_TERMINATE, |
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| 44 | /* SIGFPE 8 */ SIGACTION_TERMINATE, |
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| 45 | /* SIGKILL 9 */ SIGACTION_TERMINATE, |
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| 46 | /* SIGBUS 10 */ SIGACTION_TERMINATE, |
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| 47 | /* SIGSEGV 11 */ SIGACTION_TERMINATE, |
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| 48 | /* SIGSYS 12 */ SIGACTION_TERMINATE, |
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| 49 | /* SIGPIPE 13 */ SIGACTION_TERMINATE, |
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| 50 | /* SIGALRM 14 */ SIGACTION_TERMINATE, |
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| 51 | /* SIGTERM 15 */ SIGACTION_TERMINATE, |
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| 52 | /* SIGUSR1 16 */ SIGACTION_TERMINATE, |
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| 53 | /* SIGUSR2 17 */ SIGACTION_TERMINATE, |
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| 54 | /* SIGRTMIN 18 */ SIGACTION_IGNORE, |
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[c8f5ab5] | 55 | /* SIGRT 19 */ SIGACTION_IGNORE, |
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| 56 | /* SIGRT 20 */ SIGACTION_IGNORE, |
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| 57 | /* SIGRT 21 */ SIGACTION_IGNORE, |
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[fdec30b] | 58 | /* SIGRT 22 */ SIGACTION_IGNORE, |
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| 59 | /* SIGRT 23 */ SIGACTION_IGNORE, |
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| 60 | /* SIGRT 24 */ SIGACTION_IGNORE, |
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| 61 | /* SIGRT 25 */ SIGACTION_IGNORE, |
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| 62 | /* SIGRT 26 */ SIGACTION_IGNORE, |
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| 63 | /* SIGRT 27 */ SIGACTION_IGNORE, |
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| 64 | /* SIGRT 28 */ SIGACTION_IGNORE, |
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| 65 | /* SIGRT 29 */ SIGACTION_IGNORE, |
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| 66 | /* SIGRT 30 */ SIGACTION_IGNORE, |
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| 67 | /* SIGRT 31 */ SIGACTION_IGNORE, |
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| 68 | /* SIGRTMAX 32 */ SIGACTION_IGNORE |
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| 69 | }; |
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| 70 | |
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| 71 | /*PAGE |
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| 72 | * |
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[07d880f4] | 73 | * _POSIX_signals_Abormal_termination_handler |
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| 74 | * |
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[2291b71] | 75 | */ |
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| 76 | |
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[07d880f4] | 77 | void _POSIX_signals_Abormal_termination_handler( int signo ) |
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| 78 | { |
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| 79 | exit( 1 ); |
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| 80 | } |
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[2291b71] | 81 | |
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| 82 | /*PAGE |
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| 83 | * |
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| 84 | * _POSIX_signals_Unblock_thread |
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| 85 | */ |
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| 86 | |
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| 87 | /* XXX this routine could probably be cleaned up */ |
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[c53cfd0f] | 88 | boolean _POSIX_signals_Unblock_thread( |
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[2291b71] | 89 | Thread_Control *the_thread, |
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| 90 | int signo, |
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| 91 | siginfo_t *info |
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| 92 | ) |
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| 93 | { |
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| 94 | POSIX_API_Control *api; |
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| 95 | sigset_t mask; |
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| 96 | siginfo_t *the_info = NULL; |
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| 97 | |
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| 98 | api = the_thread->API_Extensions[ THREAD_API_POSIX ]; |
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| 99 | |
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| 100 | mask = signo_to_mask( signo ); |
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| 101 | |
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| 102 | /* |
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| 103 | * Is the thread is specifically waiting for a signal? |
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| 104 | */ |
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| 105 | |
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| 106 | if ( _States_Is_interruptible_signal( the_thread->current_state ) ) { |
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| 107 | |
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| 108 | if ( (the_thread->Wait.option & mask) || (~api->signals_blocked & mask) ) { |
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| 109 | the_thread->Wait.return_code = EINTR; |
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| 110 | |
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[9e28da4] | 111 | the_info = (siginfo_t *) the_thread->Wait.return_argument; |
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[2291b71] | 112 | |
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| 113 | if ( !info ) { |
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| 114 | the_info->si_signo = signo; |
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| 115 | the_info->si_code = SI_USER; |
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| 116 | the_info->si_value.sival_int = 0; |
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| 117 | } else { |
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| 118 | *the_info = *info; |
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| 119 | } |
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| 120 | |
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| 121 | _Thread_queue_Extract_with_proxy( the_thread ); |
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[c53cfd0f] | 122 | return TRUE; |
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[2291b71] | 123 | } |
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[c53cfd0f] | 124 | |
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| 125 | /* |
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| 126 | * This should only be reached via pthread_kill(). |
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| 127 | */ |
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| 128 | |
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| 129 | return FALSE; |
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[2291b71] | 130 | } |
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| 131 | |
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| 132 | if ( ~api->signals_blocked & mask ) { |
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| 133 | the_thread->do_post_task_switch_extension = TRUE; |
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| 134 | |
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| 135 | if ( the_thread->current_state & STATES_INTERRUPTIBLE_BY_SIGNAL ) { |
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| 136 | the_thread->Wait.return_code = EINTR; |
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| 137 | if ( _States_Is_waiting_on_thread_queue(the_thread->current_state) ) |
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| 138 | _Thread_queue_Extract_with_proxy( the_thread ); |
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| 139 | else if ( _States_Is_delaying(the_thread->current_state)){ |
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| 140 | if ( _Watchdog_Is_active( &the_thread->Timer ) ) |
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| 141 | (void) _Watchdog_Remove( &the_thread->Timer ); |
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| 142 | _Thread_Unblock( the_thread ); |
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| 143 | } |
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| 144 | } |
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| 145 | } |
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[c53cfd0f] | 146 | return FALSE; |
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[2291b71] | 147 | |
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| 148 | } |
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| 149 | |
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[b85649c4] | 150 | /*PAGE |
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| 151 | * |
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| 152 | * _POSIX_signals_Set_process_signals |
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| 153 | */ |
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| 154 | |
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| 155 | void _POSIX_signals_Set_process_signals( |
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| 156 | sigset_t mask |
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| 157 | ) |
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| 158 | { |
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| 159 | ISR_Level level; |
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| 160 | |
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| 161 | _ISR_Disable( level ); |
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| 162 | if ( !_POSIX_signals_Pending ) |
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| 163 | _Thread_Do_post_task_switch_extension++; |
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| 164 | _POSIX_signals_Pending |= mask; |
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| 165 | _ISR_Enable( level ); |
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| 166 | } |
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| 167 | |
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| 168 | /*PAGE |
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| 169 | * |
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| 170 | * _POSIX_signals_Clear_process_signals |
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| 171 | */ |
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| 172 | |
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| 173 | void _POSIX_signals_Clear_process_signals( |
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| 174 | sigset_t mask |
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| 175 | ) |
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| 176 | { |
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| 177 | ISR_Level level; |
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| 178 | |
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| 179 | _ISR_Disable( level ); |
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| 180 | _POSIX_signals_Pending &= ~mask; |
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[847375f] | 181 | if ( !_POSIX_signals_Pending && _Thread_Do_post_task_switch_extension ) |
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[b85649c4] | 182 | _Thread_Do_post_task_switch_extension--; |
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| 183 | _ISR_Enable( level ); |
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| 184 | } |
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| 185 | |
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[2291b71] | 186 | /*PAGE |
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| 187 | * |
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[adae080a] | 188 | * _POSIX_signals_Clear_signals |
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[fdec30b] | 189 | */ |
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[adae080a] | 190 | |
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| 191 | boolean _POSIX_signals_Clear_signals( |
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[fdec30b] | 192 | POSIX_API_Control *api, |
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| 193 | int signo, |
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[adae080a] | 194 | siginfo_t *info, |
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| 195 | boolean is_global, |
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| 196 | boolean check_blocked |
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[fdec30b] | 197 | ) |
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| 198 | { |
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[c53cfd0f] | 199 | sigset_t mask; |
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[567ac45] | 200 | sigset_t signals_blocked; |
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[c53cfd0f] | 201 | ISR_Level level; |
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| 202 | boolean do_callout; |
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| 203 | POSIX_signals_Siginfo_node *psiginfo; |
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[adae080a] | 204 | |
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[fdec30b] | 205 | mask = signo_to_mask( signo ); |
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[adae080a] | 206 | |
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[fdec30b] | 207 | do_callout = FALSE; |
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[adae080a] | 208 | |
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[567ac45] | 209 | /* set blocked signals based on if checking for them, SIGNAL_ALL_MASK |
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| 210 | * insures that no signals are blocked and all are checked. |
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| 211 | */ |
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| 212 | |
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| 213 | if ( check_blocked ) |
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| 214 | signals_blocked = ~api->signals_blocked; |
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| 215 | else |
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| 216 | signals_blocked = SIGNAL_ALL_MASK; |
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| 217 | |
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[ea1a5bef] | 218 | /* XXX this is not right for siginfo type signals yet */ |
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| 219 | /* XXX since they can't be cleared the same way */ |
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[adae080a] | 220 | |
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[fdec30b] | 221 | _ISR_Disable( level ); |
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| 222 | if ( is_global ) { |
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[567ac45] | 223 | if ( mask & (_POSIX_signals_Pending & signals_blocked) ) { |
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[c53cfd0f] | 224 | if ( _POSIX_signals_Vectors[ signo ].sa_flags == SA_SIGINFO ) { |
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| 225 | psiginfo = (POSIX_signals_Siginfo_node *) |
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| 226 | _Chain_Get_unprotected( &_POSIX_signals_Siginfo[ signo ] ); |
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| 227 | if ( _Chain_Is_empty( &_POSIX_signals_Siginfo[ signo ] ) ) |
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| 228 | _POSIX_signals_Clear_process_signals( mask ); |
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| 229 | if ( psiginfo ) { |
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[adae080a] | 230 | *info = psiginfo->Info; |
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[c53cfd0f] | 231 | _Chain_Append_unprotected( |
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| 232 | &_POSIX_signals_Inactive_siginfo, |
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| 233 | &psiginfo->Node |
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| 234 | ); |
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| 235 | } else |
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| 236 | do_callout = FALSE; |
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| 237 | } else |
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| 238 | _POSIX_signals_Clear_process_signals( mask ); |
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[ea1a5bef] | 239 | do_callout = TRUE; |
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| 240 | } |
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[fdec30b] | 241 | } else { |
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[567ac45] | 242 | if ( mask & (api->signals_pending & signals_blocked) ) { |
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[fdec30b] | 243 | api->signals_pending &= ~mask; |
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| 244 | do_callout = TRUE; |
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| 245 | } |
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| 246 | } |
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| 247 | _ISR_Enable( level ); |
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[adae080a] | 248 | return do_callout; |
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| 249 | } |
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| 250 | |
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[fdec30b] | 251 | |
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[adae080a] | 252 | /*PAGE |
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| 253 | * |
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| 254 | * _POSIX_signals_Check_signal |
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| 255 | */ |
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| 256 | |
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| 257 | boolean _POSIX_signals_Check_signal( |
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| 258 | POSIX_API_Control *api, |
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| 259 | int signo, |
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| 260 | boolean is_global |
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| 261 | ) |
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| 262 | { |
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| 263 | siginfo_t siginfo_struct; |
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| 264 | sigset_t saved_signals_blocked; |
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| 265 | |
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| 266 | if ( ! _POSIX_signals_Clear_signals( api, signo, &siginfo_struct, |
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| 267 | is_global, TRUE ) ) |
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[fdec30b] | 268 | return FALSE; |
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[98ed15e] | 269 | |
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| 270 | /* |
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| 271 | * Since we made a union of these, only one test is necessary but this is |
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| 272 | * safer. |
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| 273 | */ |
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| 274 | |
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| 275 | assert( _POSIX_signals_Vectors[ signo ].sa_handler || |
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| 276 | _POSIX_signals_Vectors[ signo ].sa_sigaction ); |
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[fdec30b] | 277 | |
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[c8f5ab5] | 278 | /* |
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| 279 | * Just to prevent sending a signal which is currently being ignored. |
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| 280 | */ |
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| 281 | |
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| 282 | if ( _POSIX_signals_Vectors[ signo ].sa_handler == SIG_IGN ) |
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| 283 | return FALSE; |
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| 284 | |
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| 285 | /* |
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| 286 | * Block the signals requested in sa_mask |
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| 287 | */ |
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| 288 | |
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| 289 | saved_signals_blocked = api->signals_blocked; |
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| 290 | api->signals_blocked |= _POSIX_signals_Vectors[ signo ].sa_mask; |
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| 291 | |
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[fdec30b] | 292 | switch ( _POSIX_signals_Vectors[ signo ].sa_flags ) { |
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| 293 | case SA_SIGINFO: |
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[c53cfd0f] | 294 | assert( is_global ); |
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| 295 | |
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[fdec30b] | 296 | (*_POSIX_signals_Vectors[ signo ].sa_sigaction)( |
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| 297 | signo, |
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[c53cfd0f] | 298 | &siginfo_struct, |
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[fdec30b] | 299 | NULL /* context is undefined per 1003.1b-1993, p. 66 */ |
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| 300 | ); |
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| 301 | break; |
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| 302 | default: |
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| 303 | (*_POSIX_signals_Vectors[ signo ].sa_handler)( signo ); |
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| 304 | break; |
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| 305 | } |
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[c8f5ab5] | 306 | |
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| 307 | /* |
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| 308 | * Restore the previous set of blocked signals |
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| 309 | */ |
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| 310 | |
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| 311 | api->signals_blocked = saved_signals_blocked; |
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| 312 | |
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[fdec30b] | 313 | return TRUE; |
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| 314 | } |
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| 315 | |
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[98ed15e] | 316 | void _POSIX_signals_Post_switch_extension( |
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[fdec30b] | 317 | Thread_Control *the_thread |
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| 318 | ) |
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| 319 | { |
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| 320 | POSIX_API_Control *api; |
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| 321 | int signo; |
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[c8f5ab5] | 322 | ISR_Level level; |
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[fdec30b] | 323 | |
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| 324 | api = the_thread->API_Extensions[ THREAD_API_POSIX ]; |
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| 325 | |
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| 326 | /* |
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| 327 | * If we invoke any user code, there is the possibility that |
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[c8f5ab5] | 328 | * a new signal has been posted that we should process so we |
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| 329 | * restart the loop if a signal handler was invoked. |
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| 330 | * |
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| 331 | * The first thing done is to check there are any signals to be |
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| 332 | * processed at all. No point in doing this loop otherwise. |
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[fdec30b] | 333 | */ |
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| 334 | |
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| 335 | restart: |
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[c8f5ab5] | 336 | _ISR_Disable( level ); |
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| 337 | if ( !(~api->signals_blocked & |
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[b85649c4] | 338 | (api->signals_pending | _POSIX_signals_Pending)) ) { |
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| 339 | _ISR_Enable( level ); |
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| 340 | return; |
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| 341 | } |
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[9e28da4] | 342 | _ISR_Enable( level ); |
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[c8f5ab5] | 343 | |
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[fdec30b] | 344 | for ( signo = SIGRTMIN ; signo <= SIGRTMAX ; signo++ ) { |
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| 345 | |
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| 346 | if ( _POSIX_signals_Check_signal( api, signo, FALSE ) ) |
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| 347 | goto restart; |
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| 348 | |
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| 349 | if ( _POSIX_signals_Check_signal( api, signo, TRUE ) ) |
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| 350 | goto restart; |
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| 351 | |
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| 352 | } |
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| 353 | |
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[567ac45] | 354 | /* XXX - add __SIGFIRSTNOTRT or something like that to newlib siginfo.h */ |
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| 355 | |
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| 356 | for ( signo = SIGHUP ; signo <= __SIGLASTNOTRT ; signo++ ) { |
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[fdec30b] | 357 | |
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| 358 | if ( _POSIX_signals_Check_signal( api, signo, FALSE ) ) |
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| 359 | goto restart; |
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| 360 | |
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| 361 | if ( _POSIX_signals_Check_signal( api, signo, TRUE ) ) |
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| 362 | goto restart; |
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| 363 | |
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| 364 | } |
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| 365 | |
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| 366 | } |
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| 367 | |
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| 368 | /*PAGE |
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| 369 | * |
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| 370 | * _POSIX_signals_Alarm_TSR |
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| 371 | */ |
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| 372 | |
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| 373 | void _POSIX_signals_Alarm_TSR( |
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| 374 | Objects_Id id, |
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| 375 | void *argument |
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| 376 | ) |
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| 377 | { |
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[b85649c4] | 378 | int status; |
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| 379 | |
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| 380 | status = kill( getpid(), SIGALRM ); |
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| 381 | /* XXX can't print from an ISR, should this be fatal? */ |
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| 382 | assert( !status ); |
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[fdec30b] | 383 | } |
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[895efd9] | 384 | |
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| 385 | /*PAGE |
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[5e9b32b] | 386 | * |
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[895efd9] | 387 | * _POSIX_signals_Manager_Initialization |
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[5e9b32b] | 388 | */ |
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| 389 | |
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[c53cfd0f] | 390 | void _POSIX_signals_Manager_Initialization( |
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| 391 | int maximum_queued_signals |
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| 392 | ) |
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[5e9b32b] | 393 | { |
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[fdec30b] | 394 | unsigned32 signo; |
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| 395 | |
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| 396 | /* |
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| 397 | * Insure we have the same number of vectors and default vector entries |
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| 398 | */ |
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| 399 | |
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| 400 | assert( |
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| 401 | sizeof(_POSIX_signals_Vectors) == sizeof(_POSIX_signals_Default_vectors) |
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| 402 | ); |
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| 403 | |
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| 404 | memcpy( |
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| 405 | _POSIX_signals_Vectors, |
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| 406 | _POSIX_signals_Default_vectors, |
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| 407 | sizeof( _POSIX_signals_Vectors ) |
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| 408 | ); |
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| 409 | |
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| 410 | /* |
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| 411 | * Initialize the set of pending signals for the entire process |
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| 412 | */ |
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| 413 | |
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| 414 | sigemptyset( &_POSIX_signals_Pending ); |
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| 415 | |
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| 416 | /* |
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| 417 | * Initialize the timer used to implement alarm(). |
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| 418 | */ |
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| 419 | |
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| 420 | _Watchdog_Initialize( |
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| 421 | &_POSIX_signals_Alarm_timer, |
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| 422 | _POSIX_signals_Alarm_TSR, |
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| 423 | 0, |
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| 424 | NULL |
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| 425 | ); |
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| 426 | |
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[2291b71] | 427 | /* |
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| 428 | * Initialize the queue we use to block for signals |
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| 429 | */ |
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| 430 | |
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| 431 | _Thread_queue_Initialize( |
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| 432 | &_POSIX_signals_Wait_queue, |
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| 433 | OBJECTS_NO_CLASS, |
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| 434 | THREAD_QUEUE_DISCIPLINE_PRIORITY, |
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| 435 | STATES_WAITING_FOR_SIGNAL | STATES_INTERRUPTIBLE_BY_SIGNAL, |
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| 436 | NULL, |
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| 437 | EAGAIN |
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| 438 | ); |
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| 439 | |
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| 440 | /* XXX status codes */ |
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[c53cfd0f] | 441 | |
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[fdec30b] | 442 | /* |
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[c53cfd0f] | 443 | * Allocate the siginfo pools. |
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[fdec30b] | 444 | */ |
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| 445 | |
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| 446 | for ( signo=1 ; signo<= SIGRTMAX ; signo++ ) |
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| 447 | _Chain_Initialize_empty( &_POSIX_signals_Siginfo[ signo ] ); |
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| 448 | |
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[c53cfd0f] | 449 | _Chain_Initialize( |
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| 450 | &_POSIX_signals_Inactive_siginfo, |
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| 451 | _Workspace_Allocate_or_fatal_error( |
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| 452 | maximum_queued_signals * sizeof( POSIX_signals_Siginfo_node ) |
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| 453 | ), |
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| 454 | maximum_queued_signals, |
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| 455 | sizeof( POSIX_signals_Siginfo_node ) |
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| 456 | ); |
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[5e9b32b] | 457 | } |
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