Function lwp_signal_setitimer

components/lwp/lwp_itimer.c:27–71

#include "syscall_generic.h"

rt_err_t lwp_signal_setitimer(rt_lwp_t lwp, int which, const struct itimerspec *restrict new, struct itimerspec *restrict old)
{
    rt_err_t rc = RT_EOK;
    timer_t timerid = 0;
    int flags = 0;

    if (lwp->signal.real_timer == LWP_SIG_INVALID_TIMER)
    {
        struct sigevent sevp = {
            .sigev_signo = SIGALRM,
            .sigev_notify = SIGEV_SIGNAL,
        };

        rc = timer_create(CLOCK_REALTIME_ALARM, &sevp, &timerid);
        if (rc == RT_EOK)
        {
            RT_ASSERT(timerid != LWP_SIG_INVALID_TIMER);
            lwp->signal.real_timer = timerid;
        }
        else
        {
            /* failed to create timer */
        }
    }
    else
    {
        timerid = lwp->signal.real_timer;
    }

    if (rc == RT_EOK)
    {
        switch (which)
        {
            case ITIMER_REAL:
                rc = timer_settime(timerid, flags, new, old);
                break;
            default:
                rc = -ENOSYS;
                LOG_W("%s() unsupported timer", __func__);
                break;
        }
    }

    return rc;
}