54 lines
1.5 KiB
C
54 lines
1.5 KiB
C
/* The kernel call implemented in this file:
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* m_type: SYS_SETTIME
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*
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* The parameters for this kernel call are:
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* m4_l2: T_SETTIME_NOW
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* m4_l3: T_CLOCK_ID
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* m4_ll1: T_TIME_SEC
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* m4_l5: T_TIME_NSEC
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*/
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#include "kernel/system.h"
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#include <minix/endpoint.h>
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#include <time.h>
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/*===========================================================================*
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* do_settime *
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*===========================================================================*/
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int do_settime(struct proc * caller, message * m_ptr)
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{
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clock_t newclock;
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int32_t ticks;
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time_t timediff, timediff_ticks;
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if (m_ptr->T_CLOCK_ID != CLOCK_REALTIME) /* only realtime can change */
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return EINVAL;
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if (m_ptr->T_SETTIME_NOW == 0) { /* user just wants to adjtime() */
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/* convert delta value from seconds and nseconds to ticks */
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ticks = (m_ptr->T_TIME_SEC * system_hz) +
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(m_ptr->T_TIME_NSEC/(1000000000/system_hz));
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set_adjtime_delta(ticks);
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return(OK);
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} /* else user wants to set the time */
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timediff = m_ptr->T_TIME_SEC - boottime;
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timediff_ticks = timediff * system_hz;
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/* prevent a negative value for realtime */
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if (m_ptr->T_TIME_SEC <= boottime ||
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timediff_ticks < LONG_MIN/2 || timediff_ticks > LONG_MAX/2) {
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/* boottime was likely wrong, try to correct it. */
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boottime = m_ptr->T_TIME_SEC;
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set_realtime(1);
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return(OK);
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}
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/* calculate the new value of realtime in ticks */
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newclock = timediff_ticks + (m_ptr->T_TIME_NSEC/(1000000000/system_hz));
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set_realtime(newclock);
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return(OK);
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}
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