1 | /* |
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2 | * 3.3.8 Synchronously Accept a Signal, P1003.1b-1993, p. 76 |
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3 | * |
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4 | * COPYRIGHT (c) 1989-2007. |
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5 | * On-Line Applications Research Corporation (OAR). |
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6 | * |
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7 | * The license and distribution terms for this file may be |
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8 | * found in the file LICENSE in this distribution or at |
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9 | * http://www.rtems.com/license/LICENSE. |
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10 | * |
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11 | * $Id$ |
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12 | */ |
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13 | |
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14 | #if HAVE_CONFIG_H |
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15 | #include "config.h" |
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16 | #endif |
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17 | |
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18 | #include <pthread.h> |
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19 | #include <signal.h> |
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20 | #include <errno.h> |
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21 | |
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22 | #include <rtems/system.h> |
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23 | #include <rtems/posix/pthread.h> |
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24 | #include <rtems/posix/psignal.h> |
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25 | #include <rtems/seterr.h> |
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26 | #include <rtems/posix/time.h> |
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27 | #include <rtems/score/isr.h> |
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28 | |
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29 | int _POSIX_signals_Get_highest( |
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30 | sigset_t set |
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31 | ) |
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32 | { |
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33 | int signo; |
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34 | |
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35 | for ( signo = SIGRTMIN ; signo <= SIGRTMAX ; signo++ ) { |
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36 | if ( set & signo_to_mask( signo ) ) |
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37 | return signo; |
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38 | } |
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39 | |
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40 | /* XXX - add __SIGFIRSTNOTRT or something like that to newlib signal .h */ |
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41 | |
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42 | for ( signo = SIGHUP ; signo <= __SIGLASTNOTRT ; signo++ ) { |
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43 | if ( set & signo_to_mask( signo ) ) |
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44 | return signo; |
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45 | } |
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46 | |
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47 | return 0; |
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48 | } |
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49 | |
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50 | int sigtimedwait( |
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51 | const sigset_t *set, |
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52 | siginfo_t *info, |
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53 | const struct timespec *timeout |
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54 | ) |
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55 | { |
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56 | Thread_Control *the_thread; |
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57 | POSIX_API_Control *api; |
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58 | Watchdog_Interval interval; |
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59 | siginfo_t signal_information; |
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60 | siginfo_t *the_info; |
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61 | int signo; |
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62 | ISR_Level level; |
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63 | |
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64 | /* |
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65 | * Error check parameters before disabling interrupts. |
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66 | */ |
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67 | |
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68 | interval = 0; |
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69 | if ( timeout ) { |
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70 | |
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71 | if ( !_Timespec_Is_valid( timeout ) ) { |
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72 | rtems_set_errno_and_return_minus_one( EINVAL ); |
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73 | } |
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74 | |
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75 | interval = _Timespec_To_ticks( timeout ); |
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76 | } |
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77 | |
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78 | /* |
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79 | * Initialize local variables. |
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80 | */ |
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81 | |
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82 | the_info = ( info ) ? info : &signal_information; |
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83 | |
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84 | the_thread = _Thread_Executing; |
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85 | |
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86 | api = the_thread->API_Extensions[ THREAD_API_POSIX ]; |
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87 | |
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88 | /* |
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89 | * What if they are already pending? |
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90 | */ |
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91 | |
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92 | /* API signals pending? */ |
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93 | |
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94 | _ISR_Disable( level ); |
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95 | if ( *set & api->signals_pending ) { |
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96 | /* XXX real info later */ |
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97 | the_info->si_signo = _POSIX_signals_Get_highest( api->signals_pending ); |
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98 | _POSIX_signals_Clear_signals( |
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99 | api, |
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100 | the_info->si_signo, |
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101 | the_info, |
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102 | FALSE, |
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103 | FALSE |
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104 | ); |
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105 | _ISR_Enable( level ); |
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106 | |
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107 | the_info->si_code = SI_USER; |
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108 | the_info->si_value.sival_int = 0; |
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109 | return the_info->si_signo; |
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110 | } |
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111 | |
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112 | /* Process pending signals? */ |
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113 | |
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114 | if ( *set & _POSIX_signals_Pending ) { |
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115 | signo = _POSIX_signals_Get_highest( _POSIX_signals_Pending ); |
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116 | _POSIX_signals_Clear_signals( api, signo, the_info, TRUE, FALSE ); |
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117 | _ISR_Enable( level ); |
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118 | |
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119 | the_info->si_signo = signo; |
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120 | the_info->si_code = SI_USER; |
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121 | the_info->si_value.sival_int = 0; |
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122 | return signo; |
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123 | } |
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124 | |
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125 | the_info->si_signo = -1; |
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126 | |
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127 | _Thread_Disable_dispatch(); |
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128 | the_thread->Wait.queue = &_POSIX_signals_Wait_queue; |
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129 | the_thread->Wait.return_code = EINTR; |
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130 | the_thread->Wait.option = *set; |
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131 | the_thread->Wait.return_argument = the_info; |
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132 | _Thread_queue_Enter_critical_section( &_POSIX_signals_Wait_queue ); |
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133 | _ISR_Enable( level ); |
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134 | _Thread_queue_Enqueue( &_POSIX_signals_Wait_queue, interval ); |
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135 | _Thread_Enable_dispatch(); |
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136 | |
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137 | /* |
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138 | * When the thread is set free by a signal, it is need to eliminate |
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139 | * the signal. |
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140 | */ |
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141 | |
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142 | _POSIX_signals_Clear_signals( api, the_info->si_signo, the_info, FALSE, FALSE ); |
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143 | errno = _Thread_Executing->Wait.return_code; |
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144 | return the_info->si_signo; |
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145 | } |
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