/*
* $Id$
*/
#include <assert.h>
#include <time.h>
#include <errno.h>
#include <rtems/system.h>
#include <rtems/score/isr.h>
#include <rtems/score/thread.h>
#include <rtems/score/tod.h>
#include <rtems/posix/seterr.h>
#include <rtems/posix/time.h>
/*PAGE
*
* _POSIX_Timespec_subtract
*/
void _POSIX_Timespec_subtract(
const struct timespec *the_start,
const struct timespec *end,
struct timespec *result
)
{
struct timespec start_struct = *the_start;
struct timespec *start = &start_struct;
unsigned int nsecs_per_sec = TOD_NANOSECONDS_PER_SECOND;
if (end->tv_nsec < start->tv_nsec) {
int seconds = (start->tv_nsec - end->tv_nsec) / nsecs_per_sec + 1;
start->tv_nsec -= nsecs_per_sec * seconds;
start->tv_sec += seconds;
}
if (end->tv_nsec - start->tv_nsec > nsecs_per_sec) {
int seconds = (start->tv_nsec - end->tv_nsec) / nsecs_per_sec;
start->tv_nsec += nsecs_per_sec * seconds;
start->tv_sec -= seconds;
}
result->tv_sec = end->tv_sec - start->tv_sec;
result->tv_nsec = end->tv_nsec - start->tv_nsec;
}
/*PAGE
*
* _POSIX_Timespec_to_interval
*/
Watchdog_Interval _POSIX_Timespec_to_interval(
const struct timespec *time
)
{
Watchdog_Interval ticks;
ticks = (time->tv_sec * TOD_MICROSECONDS_PER_SECOND) /
_TOD_Microseconds_per_tick;
ticks += (time->tv_nsec / TOD_NANOSECONDS_PER_MICROSECOND) /
_TOD_Microseconds_per_tick;
if (ticks)
return ticks;
return 1;
}
/*PAGE
*
* _POSIX_Interval_to_timespec
*/
void _POSIX_Interval_to_timespec(
Watchdog_Interval ticks,
struct timespec *time
)
{
unsigned32 usecs;
usecs = ticks * _TOD_Microseconds_per_tick;
time->tv_sec = usecs / TOD_MICROSECONDS_PER_SECOND;
time->tv_nsec = (usecs % TOD_MICROSECONDS_PER_SECOND) *
TOD_NANOSECONDS_PER_MICROSECOND;
}
/*PAGE
*
* 4.5.1 Get System Time, P1003.1b-1993, p. 91
*/
/* Using the implementation in newlib */
#if 0
time_t time(
time_t *tloc
)
{
time_t seconds_since_epoch;
/*
* No error is the time of day is not set. For RTEMS the system time
* starts out at the rtems epoch.
*/
/*
* Internally the RTEMS epoch is 1988. This must be taken into account.
*/
seconds_since_epoch = _TOD_Seconds_since_epoch;
seconds_since_epoch += POSIX_TIME_SECONDS_1970_THROUGH_1988;
if ( tloc )
*tloc = seconds_since_epoch;
return seconds_since_epoch;
}
#endif
/*PAGE
*
* 14.2.1 Clocks, P1003.1b-1993, p. 263
*/
int clock_settime(
clockid_t clock_id,
const struct timespec *tp
)
{
struct tm split_time;
TOD_Control tod;
Watchdog_Interval seconds;
assert( tp );
switch ( clock_id ) {
case CLOCK_REALTIME:
(void) gmtime_r( &tp->tv_sec, &split_time );
/*
* Convert the tm structure format to that used by the TOD Handler
*
* NOTE: TOD Handler does not honor leap seconds.
*/
tod.year = split_time.tm_year + 1900; /* RHS is years since 1900 */
tod.month = split_time.tm_mon + 1; /* RHS uses 0-11 */
tod.day = split_time.tm_mday;
tod.hour = split_time.tm_hour;
tod.minute = split_time.tm_min;
tod.second = split_time.tm_sec; /* RHS allows 0-61 for leap seconds */
tod.ticks = (tp->tv_nsec / TOD_NANOSECONDS_PER_MICROSECOND) /
_TOD_Microseconds_per_tick;
if ( !_TOD_Validate( &tod ) )
set_errno_and_return_minus_one( EINVAL );
/*
* We can't use the tp->tv_sec field because it is based on
* a different EPOCH.
*/
seconds = _TOD_To_seconds( &tod );
_Thread_Disable_dispatch();
_TOD_Set( &tod, seconds );
_Thread_Enable_dispatch();
break;
#ifdef _POSIX_CPUTIME
case CLOCK_PROCESS_CPUTIME:
return POSIX_NOT_IMPLEMENTED();
break;
#endif
#ifdef _POSIX_THREAD_CPUTIME
case CLOCK_THREAD_CPUTIME:
return POSIX_NOT_IMPLEMENTED();
break;
#endif
default:
set_errno_and_return_minus_one( EINVAL );
}
return 0;
}
/*PAGE
*
* 14.2.1 Clocks, P1003.1b-1993, p. 263
*/
int clock_gettime(
clockid_t clock_id,
struct timespec *tp
)
{
ISR_Level level;
time_t seconds;
long ticks;
if ( !tp )
set_errno_and_return_minus_one( EINVAL );
switch ( clock_id ) {
case CLOCK_REALTIME:
_ISR_Disable( level );
seconds = _TOD_Seconds_since_epoch;
ticks = _TOD_Current.ticks;
_ISR_Enable( level );
tp->tv_sec = seconds + POSIX_TIME_SECONDS_1970_THROUGH_1988;
tp->tv_nsec = ticks * _TOD_Microseconds_per_tick *
TOD_NANOSECONDS_PER_MICROSECOND;
break;
#ifdef _POSIX_CPUTIME
case CLOCK_PROCESS_CPUTIME:
/* don't base this on _Watchdog_Ticks_since_boot--duration is too short*/
return POSIX_NOT_IMPLEMENTED();
break;
#endif
#ifdef _POSIX_THREAD_CPUTIME
case CLOCK_THREAD_CPUTIME:
return POSIX_NOT_IMPLEMENTED();
break;
#endif
default:
set_errno_and_return_minus_one( EINVAL );
}
return 0;
}
/*PAGE
*
* 14.2.1 Clocks, P1003.1b-1993, p. 263
*/
int clock_getres(
clockid_t clock_id,
struct timespec *res
)
{
if ( !res )
set_errno_and_return_minus_one( EINVAL );
switch ( clock_id ) {
/*
* All time in rtems is based on the same clock tick.
*/
case CLOCK_REALTIME:
case CLOCK_PROCESS_CPUTIME:
case CLOCK_THREAD_CPUTIME:
if ( res )
_POSIX_Interval_to_timespec( _TOD_Microseconds_per_tick, res );
break;
default:
set_errno_and_return_minus_one( EINVAL );
}
return 0;
}
/*PAGE
*
* 14.2.5 High Resolution Sleep, P1003.1b-1993, p. 269
*/
int nanosleep(
const struct timespec *rqtp,
struct timespec *rmtp
)
{
Watchdog_Interval ticks;
struct timespec *the_rqtp;
if ( !rqtp )
set_errno_and_return_minus_one( EINVAL );
the_rqtp = (struct timespec *)rqtp;
/*
* Return EAGAIN if the delay interval is negative.
*
* NOTE: This behavior is beyond the POSIX specification.
* FSU pthreads shares this behavior.
*/
if ( the_rqtp->tv_sec < 0 )
the_rqtp->tv_sec = 0;
if ( /* the_rqtp->tv_sec < 0 || */ the_rqtp->tv_nsec < 0 )
set_errno_and_return_minus_one( EAGAIN );
if ( the_rqtp->tv_nsec >= TOD_NANOSECONDS_PER_SECOND )
set_errno_and_return_minus_one( EINVAL );
ticks = _POSIX_Timespec_to_interval( the_rqtp );
/*
* This behavior is also beyond the POSIX specification but is
* consistent with the RTEMS api and yields desirable behavior.
*/
if ( !ticks ) {
_Thread_Yield_processor();
_Thread_Dispatch();
if ( rmtp ) {
rmtp->tv_sec = 0;
rmtp->tv_nsec = 0;
}
return 0;
}
_Thread_Disable_dispatch();
_Thread_Set_state(
_Thread_Executing,
STATES_DELAYING | STATES_INTERRUPTIBLE_BY_SIGNAL
);
_Watchdog_Initialize(
&_Thread_Executing->Timer,
_Thread_Delay_ended,
_Thread_Executing->Object.id,
NULL
);
_Watchdog_Insert_ticks( &_Thread_Executing->Timer, ticks );
_Thread_Enable_dispatch();
/* calculate time remaining */
if ( rmtp ) {
ticks -=
_Thread_Executing->Timer.stop_time - _Thread_Executing->Timer.start_time;
_POSIX_Interval_to_timespec( ticks, rmtp );
/*
* If there is time remaining, then we were interrupted by a signal.
*/
if ( ticks )
set_errno_and_return_minus_one( EINTR );
}
return 0;
}
/*PAGE
*
* 20.1.3 Accessing a Process CPU-time CLock, P1003.4b/D8, p. 55
*/
int clock_getcpuclockid(
pid_t pid,
clockid_t *clock_id
)
{
return POSIX_NOT_IMPLEMENTED();
}
/*PAGE
*
* 20.1.5 CPU-time Clock Attribute Access, P1003.4b/D8, p. 58
*/
int clock_setenable_attr(
clockid_t clock_id,
int attr
)
{
return POSIX_NOT_IMPLEMENTED();
}
/*PAGE
*
* 20.1.5 CPU-time Clock Attribute Access, P1003.4b/D8, p. 58
*/
int clock_getenable_attr(
clockid_t clock_id,
int *attr
)
{
return POSIX_NOT_IMPLEMENTED();
}
