minix/lib/libc/sys-minix/adjtime.c
Thomas Cort 15b3d77268 libc: add adjtime() system call.
Implement the adjtime() system call and add a test for it to test69.
Additionally, install the adjtime.2 and clock_*.2 man pages.
2013-04-04 15:04:54 +02:00

36 lines
903 B
C

#include <sys/cdefs.h>
#include <lib.h>
#include "namespace.h"
#include <sys/time.h>
#include <time.h>
#ifdef __weak_alias
__weak_alias(adjtime, __adjtime50);
#endif
int adjtime(const struct timeval *delta, struct timeval *olddelta)
{
message m;
m.m2_i2 = 0; /* use adjtime() method to slowly adjust the clock. */
m.m2_i1 = (clockid_t) CLOCK_REALTIME;
m.m2_l1 = (time_t) delta->tv_sec;
m.m2_l2 = (long) delta->tv_usec * 1000; /* convert usec to nsec */
if (_syscall(PM_PROC_NR, CLOCK_SETTIME, &m) < 0)
return -1;
if (olddelta != NULL) {
/* the kernel returns immediately and the adjustment happens in the
* background. Also, any currently running adjustment is stopped by
* another call to adjtime(2), so the only values possible on Minix
* for olddelta are those of delta.
*/
olddelta->tv_sec = delta->tv_sec;
olddelta->tv_usec = delta->tv_usec;
}
return 0;
}