minix/lib/libsys/sys_settime.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

20 lines
303 B
C

#include "syslib.h"
#include <time.h>
int sys_settime(now, clk_id, sec, nsec)
int now;
clockid_t clk_id;
time_t sec;
long nsec;
{
message m;
int r;
m.T_SETTIME_NOW = now;
m.T_CLOCK_ID = clk_id;
m.T_TIME_SEC = sec;
m.T_TIME_NSEC = nsec;
r = _kernel_call(SYS_SETTIME, &m);
return(r);
}