minix/lib/syslib/sys_vtimer.c

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#include "syslib.h"
PUBLIC int sys_vtimer(proc, which, newval, oldval)
endpoint_t proc; /* proc to retrieve/set the timer for */
int which; /* timer to retrieve/set */
clock_t *newval; /* if non-NULL, set to this new value */
clock_t *oldval; /* if non-NULL, old value is stored here */
{
message m;
int r;
m.VT_ENDPT = proc;
m.VT_WHICH = which;
if (newval != NULL) {
m.VT_SET = 1;
m.VT_VALUE = *newval;
} else {
m.VT_SET = 0;
}
r = _taskcall(SYSTASK, SYS_VTIMER, &m);
if (oldval != NULL) {
*oldval = m.VT_VALUE;
}
return(r);
}