functions_rt.cpp

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/*****************************************************************************
** Includes
*****************************************************************************/

#include "../../include/ecl/time_lite/functions_rt.hpp"
#include <errno.h>

/*****************************************************************************
** Macros
*****************************************************************************/

#if defined(ECL_HAS_RT_TIMERS)

/*****************************************************************************
** Namespaces
*****************************************************************************/

namespace ecl {

TimeError epoch_time(TimeStructure &time) {
        // _POSIX_CLOCK_MONOTONIC should have gotten us this far,
        // just check if we have CLOCK_MONOTONIC and if not, fallback to
        // CLOCK_REALTIME.
#ifdef ECL_HAS_CLOCK_MONOTONIC
        int result = clock_gettime(CLOCK_MONOTONIC,&time);
#else
        int result = clock_gettime(CLOCK_REALTIME,&time);
#endif
        switch (result) {
                case(0) : { return TimeError(NoError); }
                case(EFAULT) : { return TimeError(MemoryError); }          // time was not in addressable memory space
                case(EINVAL) : { return TimeError(ArgNotSupportedError); } // clock id is not supported (actually impossible if cmake detects)
                case(EPERM) : { return TimeError(PermissionsError); }      // user does not have permissions to use the clock.
                default : { return TimeError(UnknownError); }
        }
}

TimeError realtime_epoch_time(TimeStructure &time) {
        int result = clock_gettime(CLOCK_REALTIME,&time);
        switch (result) {
                case(0) : { return TimeError(NoError); }
                case(EFAULT) : { return TimeError(MemoryError); }          // time was not in addressable memory space
                case(EINVAL) : { return TimeError(ArgNotSupportedError); } // clock id is not supported (actually impossible if cmake detects)
                case(EPERM) : { return TimeError(PermissionsError); }      // user does not have permissions to use the clock.
                default : { return TimeError(UnknownError); }
        }
}

TimeError sleep_until(const TimeStructure &time) {
    // Last arg is to catch remaining time if interrupted by a signal, not necessary here.
#ifdef ECL_HAS_CLOCK_MONOTONIC
        int result = clock_nanosleep(CLOCK_MONOTONIC,TIMER_ABSTIME,&time,NULL);
#else
        int result =  clock_nanosleep(CLOCK_REALTIME,TIMER_ABSTIME,&time,NULL);
#endif
        switch (result) {
                case(0) : { return TimeError(NoError); }
                case(EFAULT) : { return TimeError(MemoryError); }     // time was not in addressable memory space
                case(EINTR) : { return TimeError(InterruptedError); } // interrupted by a signal
                case(EINVAL) : { return TimeError(OutOfRangeError); } // sec/nsec pair specified was out of range
                default : { return TimeError(UnknownError); }
        }
}
TimeError sleep(const TimeStructure &time) {
        int result = nanosleep(&time, NULL);
        switch (result) {
                case(0) : { return TimeError(NoError); }
                case(EFAULT) : { return TimeError(MemoryError); }     // some memory error copying information around
                case(EINTR) : { return TimeError(InterruptedError); } // interrupted by a signal
                case(EINVAL) : { return TimeError(OutOfRangeError); } // sec/nsec pair specified was out of range
                default : { return TimeError(UnknownError); }
        }
}

} // namespace ecl

#endif