1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief POSIX Signals Clear Signals |
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5 | * @ingroup POSIX_SIGNALS POSIX Signals Support |
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6 | */ |
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7 | |
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8 | /* |
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9 | * COPYRIGHT (c) 1989-2007. |
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10 | * On-Line Applications Research Corporation (OAR). |
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11 | * |
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12 | * The license and distribution terms for this file may be |
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13 | * found in the file LICENSE in this distribution or at |
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14 | * http://www.rtems.com/license/LICENSE. |
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15 | */ |
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16 | |
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17 | #if HAVE_CONFIG_H |
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18 | #include "config.h" |
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19 | #endif |
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20 | |
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21 | #include <errno.h> |
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22 | #include <pthread.h> |
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23 | #include <signal.h> |
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24 | |
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25 | #include <rtems/system.h> |
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26 | #include <rtems/score/isr.h> |
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27 | #include <rtems/score/thread.h> |
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28 | #include <rtems/score/wkspace.h> |
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29 | #include <rtems/seterr.h> |
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30 | #include <rtems/posix/threadsup.h> |
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31 | #include <rtems/posix/psignalimpl.h> |
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32 | #include <rtems/posix/pthreadimpl.h> |
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33 | #include <rtems/posix/time.h> |
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34 | #include <stdio.h> |
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35 | |
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36 | /* |
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37 | * _POSIX_signals_Clear_signals |
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38 | */ |
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39 | |
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40 | bool _POSIX_signals_Clear_signals( |
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41 | POSIX_API_Control *api, |
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42 | int signo, |
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43 | siginfo_t *info, |
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44 | bool is_global, |
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45 | bool check_blocked |
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46 | ) |
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47 | { |
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48 | sigset_t mask; |
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49 | sigset_t signals_blocked; |
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50 | ISR_Level level; |
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51 | bool do_callout; |
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52 | POSIX_signals_Siginfo_node *psiginfo; |
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53 | |
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54 | mask = signo_to_mask( signo ); |
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55 | |
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56 | do_callout = false; |
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57 | |
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58 | /* set blocked signals based on if checking for them, SIGNAL_ALL_MASK |
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59 | * insures that no signals are blocked and all are checked. |
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60 | */ |
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61 | |
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62 | if ( check_blocked ) |
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63 | signals_blocked = ~api->signals_blocked; |
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64 | else |
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65 | signals_blocked = SIGNAL_ALL_MASK; |
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66 | |
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67 | /* XXX is this right for siginfo type signals? */ |
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68 | /* XXX are we sure they can be cleared the same way? */ |
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69 | |
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70 | _ISR_Disable( level ); |
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71 | if ( is_global ) { |
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72 | if ( mask & (_POSIX_signals_Pending & signals_blocked) ) { |
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73 | if ( _POSIX_signals_Vectors[ signo ].sa_flags == SA_SIGINFO ) { |
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74 | psiginfo = (POSIX_signals_Siginfo_node *) |
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75 | _Chain_Get_unprotected( &_POSIX_signals_Siginfo[ signo ] ); |
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76 | _POSIX_signals_Clear_process_signals( signo ); |
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77 | /* |
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78 | * It may be impossible to get here with an empty chain |
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79 | * BUT until that is proven we need to be defensive and |
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80 | * protect against it. |
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81 | */ |
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82 | if ( psiginfo ) { |
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83 | *info = psiginfo->Info; |
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84 | _Chain_Append_unprotected( |
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85 | &_POSIX_signals_Inactive_siginfo, |
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86 | &psiginfo->Node |
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87 | ); |
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88 | } else |
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89 | do_callout = false; |
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90 | } |
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91 | _POSIX_signals_Clear_process_signals( signo ); |
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92 | do_callout = true; |
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93 | } |
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94 | } else { |
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95 | if ( mask & (api->signals_pending & signals_blocked) ) { |
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96 | api->signals_pending &= ~mask; |
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97 | do_callout = true; |
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98 | } |
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99 | } |
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100 | _ISR_Enable( level ); |
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101 | return do_callout; |
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102 | } |
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