516fec97d9
This also adds the sys_settime() kernel call which allows for the adjusting of the clock named realtime in the kernel. The existing sys_stime() function is still needed for a separate job (setting the boottime). The boottime is set in the readclock driver. The sys_settime() interface is meant to be flexible and will support both clock_settime() and adjtime() when adjtime() is implemented later. settimeofday() was adjusted to use the clock_settime() interface. One side note discovered during testing: uptime(1) (part of the last(1)), uses wtmp to determine boottime (not Minix's times(2)). This leads `uptime` to report odd results when you set the time to a time prior to boottime. This isn't a new bug introduced by my changes. It's been there for a while.
44 lines
1.2 KiB
C
44 lines
1.2 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_l4: 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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time_t timediff;
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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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/* prevent a negative value for realtime */
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if (m_ptr->T_TIME_SEC <= boottime) {
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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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timediff = m_ptr->T_TIME_SEC - boottime;
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newclock = (timediff*system_hz) + (m_ptr->T_TIME_NSEC/(1000000000/system_hz));
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if (m_ptr->T_SETTIME_NOW) {
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set_realtime(newclock);
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} /* else used adjtime() method (to be implemented) */
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return(OK);
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}
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