minix/lib/libc/sys-minix/clock_getres.c
Thomas Cort 516fec97d9 libc: add clock_settime() system call.
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.
2013-04-04 15:04:54 +02:00

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C

#include <sys/cdefs.h>
#include <lib.h>
#include "namespace.h"
#include <sys/time.h>
#ifdef __weak_alias
__weak_alias(clock_getres, __clock_getres50);
#endif
int clock_getres(clockid_t clock_id, struct timespec *res)
{
message m;
m.m2_i1 = (clockid_t) clock_id;
if (_syscall(PM_PROC_NR, CLOCK_GETRES, &m) < 0)
return -1;
res->tv_sec = (time_t) m.m2_l1;
res->tv_nsec = (long) m.m2_l2;
return 0;
}