/**
* @file
*
* @brief POSIX Signals Manager Initialization
* @ingroup POSIX_SIGNALS
*/
/*
* COPYRIGHT (c) 1989-2008.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#if defined(RTEMS_DEBUG)
#include <assert.h>
#endif
#include <errno.h>
#include <pthread.h>
#include <signal.h>
#include <string.h> /* memcpy */
#include <stdlib.h> /* exit */
#include <rtems/system.h>
#include <rtems/config.h>
#include <rtems/score/isr.h>
#include <rtems/score/thread.h>
#include <rtems/score/threadq.h>
#include <rtems/score/wkspace.h>
#include <rtems/seterr.h>
#include <rtems/posix/threadsup.h>
#include <rtems/posix/psignalimpl.h>
#include <rtems/posix/pthreadimpl.h>
#include <rtems/posix/time.h>
#include <stdio.h>
/*** PROCESS WIDE STUFF ****/
sigset_t _POSIX_signals_Pending;
void _POSIX_signals_Abnormal_termination_handler(
int signo __attribute__((unused)) )
{
exit( 1 );
}
#define SIG_ARRAY_MAX (SIGRTMAX + 1)
const struct sigaction _POSIX_signals_Default_vectors[ SIG_ARRAY_MAX ] = {
/* NO SIGNAL 0 */ SIGACTION_IGNORE,
/* SIGHUP 1 */ SIGACTION_TERMINATE,
/* SIGINT 2 */ SIGACTION_TERMINATE,
/* SIGQUIT 3 */ SIGACTION_TERMINATE,
/* SIGILL 4 */ SIGACTION_TERMINATE,
/* SIGTRAP 5 */ SIGACTION_TERMINATE,
/* SIGIOT 6 */ SIGACTION_TERMINATE,
/* SIGABRT 6 SIGACTION_TERMINATE, -- alias for SIGIOT */
/* SIGEMT 7 */ SIGACTION_TERMINATE,
/* SIGFPE 8 */ SIGACTION_TERMINATE,
/* SIGKILL 9 */ SIGACTION_TERMINATE,
/* SIGBUS 10 */ SIGACTION_TERMINATE,
/* SIGSEGV 11 */ SIGACTION_TERMINATE,
/* SIGSYS 12 */ SIGACTION_TERMINATE,
/* SIGPIPE 13 */ SIGACTION_TERMINATE,
/* SIGALRM 14 */ SIGACTION_TERMINATE,
/* SIGTERM 15 */ SIGACTION_TERMINATE,
/* SIGURG 16 */ SIGACTION_TERMINATE,
/* SIGSTOP 17 */ SIGACTION_TERMINATE,
/* SIGTSTP 18 */ SIGACTION_TERMINATE,
/* SIGCONT 19 */ SIGACTION_TERMINATE,
/* SIGCHLD 20 */ SIGACTION_TERMINATE,
/* SIGTTIN 21 */ SIGACTION_TERMINATE,
/* SIGTTOU 22 */ SIGACTION_TERMINATE,
/* SIGIO 23 */ SIGACTION_TERMINATE,
/* SIGWINCH 24 */ SIGACTION_TERMINATE,
/* SIGUSR1 25 */ SIGACTION_TERMINATE,
/* SIGUSR2 26 */ SIGACTION_TERMINATE,
/* SIGRT 27 */ SIGACTION_TERMINATE,
/* SIGRT 28 */ SIGACTION_TERMINATE,
/* SIGRT 29 */ SIGACTION_TERMINATE,
/* SIGRT 30 */ SIGACTION_TERMINATE,
/* SIGRTMAX 31 */ SIGACTION_TERMINATE
};
struct sigaction _POSIX_signals_Vectors[ SIG_ARRAY_MAX ];
Thread_queue_Control _POSIX_signals_Wait_queue;
Chain_Control _POSIX_signals_Inactive_siginfo;
Chain_Control _POSIX_signals_Siginfo[ SIG_ARRAY_MAX ];
Watchdog_Control _POSIX_signals_Alarm_timer;
Watchdog_Control _POSIX_signals_Ualarm_timer;
/*
* XXX - move these
*/
#define _States_Is_interruptible_signal( _states ) \
( ((_states) & \
(STATES_WAITING_FOR_SIGNAL|STATES_INTERRUPTIBLE_BY_SIGNAL)) == \
(STATES_WAITING_FOR_SIGNAL|STATES_INTERRUPTIBLE_BY_SIGNAL))
/*
* _POSIX_signals_Post_switch_extension
*/
static void _POSIX_signals_Post_switch_hook(
Thread_Control *the_thread
)
{
POSIX_API_Control *api;
int signo;
ISR_Level level;
int hold_errno;
Thread_Control *executing;
executing = _Thread_Get_executing();
api = the_thread->API_Extensions[ THREAD_API_POSIX ];
/*
* We need to ensure that if the signal handler executes a call
* which overwrites the unblocking status, we restore it.
*/
hold_errno = executing->Wait.return_code;
/*
* api may be NULL in case of a thread close in progress
*/
if ( !api )
return;
/*
* If we invoke any user code, there is the possibility that
* a new signal has been posted that we should process so we
* restart the loop if a signal handler was invoked.
*
* The first thing done is to check there are any signals to be
* processed at all. No point in doing this loop otherwise.
*/
while (1) {
_ISR_Disable( level );
if ( !(~api->signals_blocked &
(api->signals_pending | _POSIX_signals_Pending)) ) {
_ISR_Enable( level );
break;
}
_ISR_Enable( level );
for ( signo = SIGRTMIN ; signo <= SIGRTMAX ; signo++ ) {
_POSIX_signals_Check_signal( api, signo, false );
_POSIX_signals_Check_signal( api, signo, true );
}
/* Unfortunately - nothing like __SIGFIRSTNOTRT in newlib signal .h */
for ( signo = SIGHUP ; signo <= __SIGLASTNOTRT ; signo++ ) {
_POSIX_signals_Check_signal( api, signo, false );
_POSIX_signals_Check_signal( api, signo, true );
}
}
executing->Wait.return_code = hold_errno;
}
API_extensions_Post_switch_control _POSIX_signals_Post_switch = {
.hook = _POSIX_signals_Post_switch_hook
};
void _POSIX_signals_Manager_Initialization(void)
{
uint32_t signo;
uint32_t maximum_queued_signals;
maximum_queued_signals = Configuration_POSIX_API.maximum_queued_signals;
/*
* Ensure we have the same number of vectors and default vector entries
*/
#if defined(RTEMS_DEBUG)
assert(
sizeof(_POSIX_signals_Vectors) == sizeof(_POSIX_signals_Default_vectors)
);
#endif
memcpy(
_POSIX_signals_Vectors,
_POSIX_signals_Default_vectors,
sizeof( _POSIX_signals_Vectors )
);
/*
* Initialize the set of pending signals for the entire process
*/
sigemptyset( &_POSIX_signals_Pending );
/*
* Initialize the queue we use to block for signals
*/
_Thread_queue_Initialize(
&_POSIX_signals_Wait_queue,
THREAD_QUEUE_DISCIPLINE_FIFO,
STATES_WAITING_FOR_SIGNAL | STATES_INTERRUPTIBLE_BY_SIGNAL,
EAGAIN
);
/* XXX status codes */
/*
* Allocate the siginfo pools.
*/
for ( signo=1 ; signo<= SIGRTMAX ; signo++ )
_Chain_Initialize_empty( &_POSIX_signals_Siginfo[ signo ] );
if ( maximum_queued_signals ) {
_Chain_Initialize(
&_POSIX_signals_Inactive_siginfo,
_Workspace_Allocate_or_fatal_error(
maximum_queued_signals * sizeof( POSIX_signals_Siginfo_node )
),
maximum_queued_signals,
sizeof( POSIX_signals_Siginfo_node )
);
} else {
_Chain_Initialize_empty( &_POSIX_signals_Inactive_siginfo );
}
/*
* Initialize the Alarm Timer
*/
_Watchdog_Initialize( &_POSIX_signals_Alarm_timer, NULL, 0, NULL );
_Watchdog_Initialize( &_POSIX_signals_Ualarm_timer, NULL, 0, NULL );
}
