Changeset da41ecbc in rtems


Ignore:
Timestamp:
04/15/99 18:58:02 (24 years ago)
Author:
Joel Sherrill <joel.sherrill@…>
Branches:
4.10, 4.11, 4.8, 4.9, 5, master
Children:
2df1974
Parents:
93994fdb
Message:

Removed alarm(), killinfo() and pause() because they are now in their own file.

Files:
2 edited

Legend:

Unmodified
Added
Removed

  • c/src/exec/posix/src/psignal.c

    r93994fdb rda41ecbc  
    3737sigset_t  _POSIX_signals_Pending;
    3838
    39 void _POSIX_signals_Abormal_termination_handler( int signo )
     39void _POSIX_signals_Abnormal_termination_handler( int signo )
    4040{
    4141  exit( 1 );
    4242}
    43 
    44 #define _POSIX_signals_Stop_handler NULL
    45 #define _POSIX_signals_Continue_handler NULL
    46 
    47 #define SIGACTION_TERMINATE \
    48   { 0, SIGNAL_ALL_MASK, {_POSIX_signals_Abormal_termination_handler} }
    49 #define SIGACTION_IGNORE \
    50   { 0, SIGNAL_ALL_MASK, {SIG_IGN} }
    51 #define SIGACTION_STOP \
    52   { 0, SIGNAL_ALL_MASK, {_POSIX_signals_Stop_handler} }
    53 #define SIGACTION_CONTINUE \
    54   { 0, SIGNAL_ALL_MASK, {_POSIX_signals_Continue_handler} }
    5543
    5644#define SIG_ARRAY_MAX  (SIGRTMAX + 1)
    … …  
    924912}
    925913
    926 /*PAGE
    927  *
    928  *  3.3.2 Send a Signal to a Process, P1003.1b-1993, p. 68
    929  *
    930  *  NOTE: Behavior of kill() depends on _POSIX_SAVED_IDS.
    931  */
    932 
    933 #define _POSIX_signals_Is_interested( _api, _mask ) \
    934   ( ~(_api)->signals_blocked & (_mask) )
    935          
    936 int killinfo(
    937   pid_t               pid,
    938   int                 sig,
    939   const union sigval *value
    940 )
    941 {
    942   sigset_t                     mask;
    943   POSIX_API_Control           *api;
    944   unsigned32                   the_class;
    945   unsigned32                   index;
    946   unsigned32                   maximum;
    947   Objects_Information         *the_info;
    948   Objects_Control            **object_table;
    949   Thread_Control              *the_thread;
    950   Thread_Control              *interested_thread;
    951   Priority_Control             interested_priority;
    952   Chain_Control               *the_chain;
    953   Chain_Node                  *the_node;
    954   siginfo_t                    siginfo_struct;
    955   siginfo_t                   *siginfo;
    956   POSIX_signals_Siginfo_node  *psiginfo;
    957  
    958 
    959 
    960   /*
    961    *  Only supported for the "calling process" (i.e. this node).
    962    */
    963  
    964   if( pid != getpid() )
    965     set_errno_and_return_minus_one( ESRCH );
    966 
    967   /*
    968    *  Validate the signal passed if not 0.
    969    */
    970  
    971   if ( sig && !is_valid_signo(sig) )
    972   {
    973     set_errno_and_return_minus_one( EINVAL );
    974   }
    975 
    976   /*
    977    *  If the signal is being ignored, then we are out of here.
    978    */
    979 
    980   if ( !sig || _POSIX_signals_Vectors[ sig ].sa_handler == SIG_IGN )
    981   {
    982     return 0;
    983   }
    984 
    985   /*
    986    *  P1003.1c/Draft 10, p. 33 says that certain signals should always
    987    *  be directed to the executing thread such as those caused by hardware
    988    *  faults.
    989    */
    990 
    991   switch ( sig ) {
    992     case SIGFPE:
    993     case SIGILL:
    994     case SIGSEGV:
    995       return pthread_kill( pthread_self(), sig );
    996     default:
    997       break;
    998   }
    999 
    1000   mask = signo_to_mask( sig );
    1001 
    1002   /*
    1003    *  Build up a siginfo structure
    1004    */
    1005 
    1006   siginfo = &siginfo_struct;
    1007   siginfo->si_signo = sig;
    1008   siginfo->si_code = SI_USER;
    1009   if ( !value ) {
    1010     siginfo->si_value.sival_int = 0;
    1011   } else {
    1012     siginfo->si_value = *value;
    1013   }
    1014 
    1015   _Thread_Disable_dispatch();
    1016 
    1017   /*
    1018    *  Is the currently executing thread interested?  If so then it will
    1019    *  get it an execute it as soon as the dispatcher executes.
    1020    */
    1021 
    1022   the_thread = _Thread_Executing;
    1023 
    1024   api = the_thread->API_Extensions[ THREAD_API_POSIX ];
    1025   if ( _POSIX_signals_Is_interested( api, mask ) ) {
    1026     goto process_it;
    1027   }
    1028 
    1029   /*
    1030    *  Is an interested thread waiting for this signal (sigwait())?
    1031    */
    1032 
    1033   /* XXX violation of visibility -- need to define thread queue support */
    1034 
    1035   for( index=0 ;
    1036        index < TASK_QUEUE_DATA_NUMBER_OF_PRIORITY_HEADERS ;
    1037        index++ ) {
    1038 
    1039     the_chain = &_POSIX_signals_Wait_queue.Queues.Priority[ index ];
    1040  
    1041     for ( the_node = the_chain->first ;
    1042           !_Chain_Is_tail( the_chain, the_node ) ;
    1043           the_node = the_node->next ) {
    1044 
    1045       the_thread = (Thread_Control *)the_node;
    1046       api = the_thread->API_Extensions[ THREAD_API_POSIX ];
    1047 
    1048       if ((the_thread->Wait.option & mask) || (~api->signals_blocked & mask)) {
    1049         goto process_it;
    1050       }
    1051 
    1052     }
    1053   }
    1054 
    1055   /*
    1056    *  Is any other thread interested?  The highest priority interested
    1057    *  thread is selected.  In the event of a tie, then the following
    1058    *  additional criteria is used:
    1059    *
    1060    *    + ready thread over blocked
    1061    *    + blocked on call interruptible by signal (can return EINTR)
    1062    *    + blocked on call not interruptible by signal
    1063    *
    1064    *  This looks at every thread in the system regardless of the creating API.
    1065    *
    1066    *  NOTES:
    1067    *
    1068    *    + rtems internal threads do not receive signals.
    1069    */
    1070 
    1071   interested_thread = NULL;
    1072   interested_priority = PRIORITY_MAXIMUM + 1;
    1073 
    1074   for ( the_class = OBJECTS_CLASSES_FIRST_THREAD_CLASS;
    1075         the_class <= OBJECTS_CLASSES_LAST_THREAD_CLASS;
    1076         the_class++ ) {
    1077 
    1078     if ( the_class == OBJECTS_INTERNAL_THREADS )
    1079       continue;
    1080 
    1081     the_info = _Objects_Information_table[ the_class ];
    1082 
    1083     if ( !the_info )                        /* manager not installed */
    1084       continue;
    1085 
    1086     maximum = the_info->maximum;
    1087     object_table = the_info->local_table;
    1088 
    1089     assert( object_table );                 /* always at least 1 entry */
    1090 
    1091     for ( index = 1 ; index <= maximum ; index++ ) {
    1092       the_thread = (Thread_Control *) object_table[ index ];
    1093 
    1094       if ( !the_thread )
    1095         continue;
    1096 
    1097       /*
    1098        *  If this thread is of lower priority than the interested thread,
    1099        *  go on to the next thread.
    1100        */
    1101 
    1102       if ( the_thread->current_priority > interested_priority )
    1103         continue;
    1104 
    1105       /*
    1106        *  If this thread is not interested, then go on to the next thread.
    1107        */
    1108 
    1109       api = the_thread->API_Extensions[ THREAD_API_POSIX ];
    1110 
    1111       if ( !api || !_POSIX_signals_Is_interested( api, mask ) )
    1112         continue;
    1113 
    1114       /*
    1115        *  Now we know the thread under connsideration is interested.
    1116        *  If the thread under consideration is of higher priority, then
    1117        *  it becomes the interested thread.
    1118        */
    1119 
    1120       if ( the_thread->current_priority < interested_priority ) {
    1121         interested_thread   = the_thread;
    1122         interested_priority = the_thread->current_priority;
    1123         continue;
    1124       }
    1125 
    1126       /*
    1127        *  Now the thread and the interested thread have the same priority.
    1128        *  If the interested thread is ready, then we don't need to send it
    1129        *  to a blocked thread.
    1130        */
    1131 
    1132       if ( _States_Is_ready( interested_thread->current_state ) )
    1133         continue;
    1134 
    1135       /*
    1136        *  Now the interested thread is blocked.
    1137        *  If the thread we are considering is not, the it becomes the
    1138        *  interested thread.
    1139        */
    1140 
    1141       if ( _States_Is_ready( the_thread->current_state ) ) {
    1142         interested_thread   = the_thread;
    1143         interested_priority = the_thread->current_priority;
    1144         continue;
    1145       }
    1146 
    1147       /*
    1148        *  Now we know both threads are blocked.
    1149        *  If the interested thread is interruptible, then just use it.
    1150        */
    1151 
    1152       /* XXX need a new states macro */
    1153       if ( interested_thread->current_state & STATES_INTERRUPTIBLE_BY_SIGNAL )
    1154         continue;
    1155 
    1156       /*
    1157        *  Now both threads are blocked and the interested thread is not
    1158        *  interruptible.
    1159        *  If the thread under consideration is interruptible by a signal,
    1160        *  then it becomes the interested thread.
    1161        */
    1162 
    1163       /* XXX need a new states macro */
    1164       if ( the_thread->current_state & STATES_INTERRUPTIBLE_BY_SIGNAL ) {
    1165         interested_thread   = the_thread;
    1166         interested_priority = the_thread->current_priority;
    1167       }
    1168     }
    1169   }
    1170 
    1171   if ( interested_thread ) {
    1172     the_thread = interested_thread;
    1173     goto process_it;
    1174   }
    1175 
    1176   /*
    1177    *  OK so no threads were interested right now.  It will be left on the
    1178    *  global pending until a thread receives it.  The global set of threads
    1179    *  can change interest in this signal in one of the following ways:
    1180    *
    1181    *    + a thread is created with the signal unblocked,
    1182    *    + pthread_sigmask() unblocks the signal,
    1183    *    + sigprocmask() unblocks the signal, OR
    1184    *    + sigaction() which changes the handler to SIG_IGN.
    1185    */
    1186 
    1187   the_thread = NULL;
    1188   goto post_process_signal;
    1189 
    1190   /*
    1191    *  We found a thread which was interested, so now we mark that this
    1192    *  thread needs to do the post context switch extension so it can
    1193    *  evaluate the signals pending.
    1194    */
    1195 
    1196 process_it:
    1197  
    1198   the_thread->do_post_task_switch_extension = TRUE;
    1199 
    1200   /*
    1201    *  Returns TRUE if the signal was synchronously given to a thread
    1202    *  blocked waiting for the signal.
    1203    */
    1204 
    1205   if ( _POSIX_signals_Unblock_thread( the_thread, sig, siginfo ) ) {
    1206     _Thread_Enable_dispatch();
    1207     return 0;
    1208   }
    1209 
    1210 post_process_signal:
    1211 
    1212   /*
    1213    *  We may have woken up a thread but we definitely need to post the
    1214    *  signal to the process wide information set.
    1215    */
    1216 
    1217   _POSIX_signals_Set_process_signals( mask );
    1218 
    1219   if ( _POSIX_signals_Vectors[ sig ].sa_flags == SA_SIGINFO ) {
    1220 
    1221     psiginfo = (POSIX_signals_Siginfo_node *)
    1222                _Chain_Get( &_POSIX_signals_Inactive_siginfo );
    1223     if ( !psiginfo )
    1224     {
    1225       set_errno_and_return_minus_one( EAGAIN );
    1226     }
    1227 
    1228     psiginfo->Info = *siginfo;
    1229 
    1230     _Chain_Append( &_POSIX_signals_Siginfo[ sig ], &psiginfo->Node );
    1231   }
    1232 
    1233   _Thread_Enable_dispatch();
    1234   return 0;
    1235 }
    1236 
    1237914/*
    1238915 *  3.3.9 Queue a Signal to a Process, P1003.1b-1993, p. 78
    … …  
    1307984  return POSIX_BOTTOM_REACHED();
    1308985}
    1309 
    1310 /*
    1311  *  3.4.1 Schedule Alarm, P1003.1b-1993, p. 79
    1312  */
    1313 
    1314 Watchdog_Control _POSIX_signals_Alarm_timer;
    1315 
    1316 unsigned int alarm(
    1317   unsigned int seconds
    1318 )
    1319 {
    1320   unsigned int      remaining = 0;
    1321   Watchdog_Control *the_timer;
    1322 
    1323   the_timer = &_POSIX_signals_Alarm_timer;
    1324 
    1325   switch ( _Watchdog_Remove( the_timer ) ) {
    1326     case WATCHDOG_INACTIVE:
    1327     case WATCHDOG_BEING_INSERTED:
    1328       break;
    1329  
    1330     case WATCHDOG_ACTIVE:
    1331     case WATCHDOG_REMOVE_IT:
    1332       remaining = the_timer->initial -
    1333                   (the_timer->stop_time - the_timer->start_time);
    1334       break;
    1335   }
    1336 
    1337   _Watchdog_Insert_seconds( the_timer, seconds );
    1338 
    1339   return remaining;
    1340 }
    1341 
    1342 /*
    1343  *  3.4.2 Suspend Process Execution, P1003.1b-1993, p. 81
    1344  */
    1345 
    1346 int pause( void )
    1347 {
    1348   sigset_t  all_signals;
    1349   int       status;
    1350  
    1351   (void) sigfillset( &all_signals );
    1352  
    1353   status = sigtimedwait( &all_signals, NULL, NULL );
    1354  
    1355   return status;
    1356 }

  • cpukit/posix/src/psignal.c

    r93994fdb rda41ecbc  
    3737sigset_t  _POSIX_signals_Pending;
    3838
    39 void _POSIX_signals_Abormal_termination_handler( int signo )
     39void _POSIX_signals_Abnormal_termination_handler( int signo )
    4040{
    4141  exit( 1 );
    4242}
    43 
    44 #define _POSIX_signals_Stop_handler NULL
    45 #define _POSIX_signals_Continue_handler NULL
    46 
    47 #define SIGACTION_TERMINATE \
    48   { 0, SIGNAL_ALL_MASK, {_POSIX_signals_Abormal_termination_handler} }
    49 #define SIGACTION_IGNORE \
    50   { 0, SIGNAL_ALL_MASK, {SIG_IGN} }
    51 #define SIGACTION_STOP \
    52   { 0, SIGNAL_ALL_MASK, {_POSIX_signals_Stop_handler} }
    53 #define SIGACTION_CONTINUE \
    54   { 0, SIGNAL_ALL_MASK, {_POSIX_signals_Continue_handler} }
    5543
    5644#define SIG_ARRAY_MAX  (SIGRTMAX + 1)
    … …  
    924912}
    925913
    926 /*PAGE
    927  *
    928  *  3.3.2 Send a Signal to a Process, P1003.1b-1993, p. 68
    929  *
    930  *  NOTE: Behavior of kill() depends on _POSIX_SAVED_IDS.
    931  */
    932 
    933 #define _POSIX_signals_Is_interested( _api, _mask ) \
    934   ( ~(_api)->signals_blocked & (_mask) )
    935          
    936 int killinfo(
    937   pid_t               pid,
    938   int                 sig,
    939   const union sigval *value
    940 )
    941 {
    942   sigset_t                     mask;
    943   POSIX_API_Control           *api;
    944   unsigned32                   the_class;
    945   unsigned32                   index;
    946   unsigned32                   maximum;
    947   Objects_Information         *the_info;
    948   Objects_Control            **object_table;
    949   Thread_Control              *the_thread;
    950   Thread_Control              *interested_thread;
    951   Priority_Control             interested_priority;
    952   Chain_Control               *the_chain;
    953   Chain_Node                  *the_node;
    954   siginfo_t                    siginfo_struct;
    955   siginfo_t                   *siginfo;
    956   POSIX_signals_Siginfo_node  *psiginfo;
    957  
    958 
    959 
    960   /*
    961    *  Only supported for the "calling process" (i.e. this node).
    962    */
    963  
    964   if( pid != getpid() )
    965     set_errno_and_return_minus_one( ESRCH );
    966 
    967   /*
    968    *  Validate the signal passed if not 0.
    969    */
    970  
    971   if ( sig && !is_valid_signo(sig) )
    972   {
    973     set_errno_and_return_minus_one( EINVAL );
    974   }
    975 
    976   /*
    977    *  If the signal is being ignored, then we are out of here.
    978    */
    979 
    980   if ( !sig || _POSIX_signals_Vectors[ sig ].sa_handler == SIG_IGN )
    981   {
    982     return 0;
    983   }
    984 
    985   /*
    986    *  P1003.1c/Draft 10, p. 33 says that certain signals should always
    987    *  be directed to the executing thread such as those caused by hardware
    988    *  faults.
    989    */
    990 
    991   switch ( sig ) {
    992     case SIGFPE:
    993     case SIGILL:
    994     case SIGSEGV:
    995       return pthread_kill( pthread_self(), sig );
    996     default:
    997       break;
    998   }
    999 
    1000   mask = signo_to_mask( sig );
    1001 
    1002   /*
    1003    *  Build up a siginfo structure
    1004    */
    1005 
    1006   siginfo = &siginfo_struct;
    1007   siginfo->si_signo = sig;
    1008   siginfo->si_code = SI_USER;
    1009   if ( !value ) {
    1010     siginfo->si_value.sival_int = 0;
    1011   } else {
    1012     siginfo->si_value = *value;
    1013   }
    1014 
    1015   _Thread_Disable_dispatch();
    1016 
    1017   /*
    1018    *  Is the currently executing thread interested?  If so then it will
    1019    *  get it an execute it as soon as the dispatcher executes.
    1020    */
    1021 
    1022   the_thread = _Thread_Executing;
    1023 
    1024   api = the_thread->API_Extensions[ THREAD_API_POSIX ];
    1025   if ( _POSIX_signals_Is_interested( api, mask ) ) {
    1026     goto process_it;
    1027   }
    1028 
    1029   /*
    1030    *  Is an interested thread waiting for this signal (sigwait())?
    1031    */
    1032 
    1033   /* XXX violation of visibility -- need to define thread queue support */
    1034 
    1035   for( index=0 ;
    1036        index < TASK_QUEUE_DATA_NUMBER_OF_PRIORITY_HEADERS ;
    1037        index++ ) {
    1038 
    1039     the_chain = &_POSIX_signals_Wait_queue.Queues.Priority[ index ];
    1040  
    1041     for ( the_node = the_chain->first ;
    1042           !_Chain_Is_tail( the_chain, the_node ) ;
    1043           the_node = the_node->next ) {
    1044 
    1045       the_thread = (Thread_Control *)the_node;
    1046       api = the_thread->API_Extensions[ THREAD_API_POSIX ];
    1047 
    1048       if ((the_thread->Wait.option & mask) || (~api->signals_blocked & mask)) {
    1049         goto process_it;
    1050       }
    1051 
    1052     }
    1053   }
    1054 
    1055   /*
    1056    *  Is any other thread interested?  The highest priority interested
    1057    *  thread is selected.  In the event of a tie, then the following
    1058    *  additional criteria is used:
    1059    *
    1060    *    + ready thread over blocked
    1061    *    + blocked on call interruptible by signal (can return EINTR)
    1062    *    + blocked on call not interruptible by signal
    1063    *
    1064    *  This looks at every thread in the system regardless of the creating API.
    1065    *
    1066    *  NOTES:
    1067    *
    1068    *    + rtems internal threads do not receive signals.
    1069    */
    1070 
    1071   interested_thread = NULL;
    1072   interested_priority = PRIORITY_MAXIMUM + 1;
    1073 
    1074   for ( the_class = OBJECTS_CLASSES_FIRST_THREAD_CLASS;
    1075         the_class <= OBJECTS_CLASSES_LAST_THREAD_CLASS;
    1076         the_class++ ) {
    1077 
    1078     if ( the_class == OBJECTS_INTERNAL_THREADS )
    1079       continue;
    1080 
    1081     the_info = _Objects_Information_table[ the_class ];
    1082 
    1083     if ( !the_info )                        /* manager not installed */
    1084       continue;
    1085 
    1086     maximum = the_info->maximum;
    1087     object_table = the_info->local_table;
    1088 
    1089     assert( object_table );                 /* always at least 1 entry */
    1090 
    1091     for ( index = 1 ; index <= maximum ; index++ ) {
    1092       the_thread = (Thread_Control *) object_table[ index ];
    1093 
    1094       if ( !the_thread )
    1095         continue;
    1096 
    1097       /*
    1098        *  If this thread is of lower priority than the interested thread,
    1099        *  go on to the next thread.
    1100        */
    1101 
    1102       if ( the_thread->current_priority > interested_priority )
    1103         continue;
    1104 
    1105       /*
    1106        *  If this thread is not interested, then go on to the next thread.
    1107        */
    1108 
    1109       api = the_thread->API_Extensions[ THREAD_API_POSIX ];
    1110 
    1111       if ( !api || !_POSIX_signals_Is_interested( api, mask ) )
    1112         continue;
    1113 
    1114       /*
    1115        *  Now we know the thread under connsideration is interested.
    1116        *  If the thread under consideration is of higher priority, then
    1117        *  it becomes the interested thread.
    1118        */
    1119 
    1120       if ( the_thread->current_priority < interested_priority ) {
    1121         interested_thread   = the_thread;
    1122         interested_priority = the_thread->current_priority;
    1123         continue;
    1124       }
    1125 
    1126       /*
    1127        *  Now the thread and the interested thread have the same priority.
    1128        *  If the interested thread is ready, then we don't need to send it
    1129        *  to a blocked thread.
    1130        */
    1131 
    1132       if ( _States_Is_ready( interested_thread->current_state ) )
    1133         continue;
    1134 
    1135       /*
    1136        *  Now the interested thread is blocked.
    1137        *  If the thread we are considering is not, the it becomes the
    1138        *  interested thread.
    1139        */
    1140 
    1141       if ( _States_Is_ready( the_thread->current_state ) ) {
    1142         interested_thread   = the_thread;
    1143         interested_priority = the_thread->current_priority;
    1144         continue;
    1145       }
    1146 
    1147       /*
    1148        *  Now we know both threads are blocked.
    1149        *  If the interested thread is interruptible, then just use it.
    1150        */
    1151 
    1152       /* XXX need a new states macro */
    1153       if ( interested_thread->current_state & STATES_INTERRUPTIBLE_BY_SIGNAL )
    1154         continue;
    1155 
    1156       /*
    1157        *  Now both threads are blocked and the interested thread is not
    1158        *  interruptible.
    1159        *  If the thread under consideration is interruptible by a signal,
    1160        *  then it becomes the interested thread.
    1161        */
    1162 
    1163       /* XXX need a new states macro */
    1164       if ( the_thread->current_state & STATES_INTERRUPTIBLE_BY_SIGNAL ) {
    1165         interested_thread   = the_thread;
    1166         interested_priority = the_thread->current_priority;
    1167       }
    1168     }
    1169   }
    1170 
    1171   if ( interested_thread ) {
    1172     the_thread = interested_thread;
    1173     goto process_it;
    1174   }
    1175 
    1176   /*
    1177    *  OK so no threads were interested right now.  It will be left on the
    1178    *  global pending until a thread receives it.  The global set of threads
    1179    *  can change interest in this signal in one of the following ways:
    1180    *
    1181    *    + a thread is created with the signal unblocked,
    1182    *    + pthread_sigmask() unblocks the signal,
    1183    *    + sigprocmask() unblocks the signal, OR
    1184    *    + sigaction() which changes the handler to SIG_IGN.
    1185    */
    1186 
    1187   the_thread = NULL;
    1188   goto post_process_signal;
    1189 
    1190   /*
    1191    *  We found a thread which was interested, so now we mark that this
    1192    *  thread needs to do the post context switch extension so it can
    1193    *  evaluate the signals pending.
    1194    */
    1195 
    1196 process_it:
    1197  
    1198   the_thread->do_post_task_switch_extension = TRUE;
    1199 
    1200   /*
    1201    *  Returns TRUE if the signal was synchronously given to a thread
    1202    *  blocked waiting for the signal.
    1203    */
    1204 
    1205   if ( _POSIX_signals_Unblock_thread( the_thread, sig, siginfo ) ) {
    1206     _Thread_Enable_dispatch();
    1207     return 0;
    1208   }
    1209 
    1210 post_process_signal:
    1211 
    1212   /*
    1213    *  We may have woken up a thread but we definitely need to post the
    1214    *  signal to the process wide information set.
    1215    */
    1216 
    1217   _POSIX_signals_Set_process_signals( mask );
    1218 
    1219   if ( _POSIX_signals_Vectors[ sig ].sa_flags == SA_SIGINFO ) {
    1220 
    1221     psiginfo = (POSIX_signals_Siginfo_node *)
    1222                _Chain_Get( &_POSIX_signals_Inactive_siginfo );
    1223     if ( !psiginfo )
    1224     {
    1225       set_errno_and_return_minus_one( EAGAIN );
    1226     }
    1227 
    1228     psiginfo->Info = *siginfo;
    1229 
    1230     _Chain_Append( &_POSIX_signals_Siginfo[ sig ], &psiginfo->Node );
    1231   }
    1232 
    1233   _Thread_Enable_dispatch();
    1234   return 0;
    1235 }
    1236 
    1237914/*
    1238915 *  3.3.9 Queue a Signal to a Process, P1003.1b-1993, p. 78
    … …  
    1307984  return POSIX_BOTTOM_REACHED();
    1308985}
    1309 
    1310 /*
    1311  *  3.4.1 Schedule Alarm, P1003.1b-1993, p. 79
    1312  */
    1313 
    1314 Watchdog_Control _POSIX_signals_Alarm_timer;
    1315 
    1316 unsigned int alarm(
    1317   unsigned int seconds
    1318 )
    1319 {
    1320   unsigned int      remaining = 0;
    1321   Watchdog_Control *the_timer;
    1322 
    1323   the_timer = &_POSIX_signals_Alarm_timer;
    1324 
    1325   switch ( _Watchdog_Remove( the_timer ) ) {
    1326     case WATCHDOG_INACTIVE:
    1327     case WATCHDOG_BEING_INSERTED:
    1328       break;
    1329  
    1330     case WATCHDOG_ACTIVE:
    1331     case WATCHDOG_REMOVE_IT:
    1332       remaining = the_timer->initial -
    1333                   (the_timer->stop_time - the_timer->start_time);
    1334       break;
    1335   }
    1336 
    1337   _Watchdog_Insert_seconds( the_timer, seconds );
    1338 
    1339   return remaining;
    1340 }
    1341 
    1342 /*
    1343  *  3.4.2 Suspend Process Execution, P1003.1b-1993, p. 81
    1344  */
    1345 
    1346 int pause( void )
    1347 {
    1348   sigset_t  all_signals;
    1349   int       status;
    1350  
    1351   (void) sigfillset( &all_signals );
    1352  
    1353   status = sigtimedwait( &all_signals, NULL, NULL );
    1354  
    1355   return status;
    1356 }
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