void
count_syscall(struct tcb *tcp, const struct timeval *syscall_exiting_tv)
{
struct timeval wtv;
struct timeval *tv = &wtv;
struct call_counts *cc;
unsigned long scno = tcp->scno;
if (!SCNO_IN_RANGE(scno))
return;
if (!counts)
counts = xcalloc(nsyscalls, sizeof(*counts));
cc = &counts[scno];
cc->calls++;
if (tcp->u_error)
cc->errors++;
/* tv = wall clock time spent while in syscall */
tv_sub(tv, syscall_exiting_tv, &tcp->etime);
/* Spent more wall clock time than spent system time? (usually yes) */
if (tv_cmp(tv, &tcp->dtime) > 0) {
static struct timeval one_tick = { -1, 0 };
if (one_tick.tv_sec == -1) {
/* Initialize it. */
struct itimerval it;
memset(&it, 0, sizeof it);
it.it_interval.tv_usec = 1;
setitimer(ITIMER_REAL, &it, NULL);
getitimer(ITIMER_REAL, &it);
one_tick = it.it_interval;
//FIXME: this hack doesn't work (tested on linux-3.6.11): one_tick = 0.000000
//tprintf(" one_tick.tv_usec:%u\n", (unsigned)one_tick.tv_usec);
}
if (tv_nz(&tcp->dtime))
/* tv = system time spent, if it isn't 0 */
tv = &tcp->dtime;
else if (tv_cmp(tv, &one_tick) > 0) {
/* tv = smallest "sane" time interval */
if (tv_cmp(&shortest, &one_tick) < 0)
tv = &shortest;
else
tv = &one_tick;
}
}
if (tv_cmp(tv, &shortest) < 0)
shortest = *tv;
tv_add(&cc->time, &cc->time, count_wallclock ? &wtv : tv);
}
void
count_syscall(struct tcb *tcp, struct timeval *tv)
{
if (!SCNO_IN_RANGE(tcp->scno))
return;
if (!counts) {
counts = calloc(nsyscalls, sizeof(*counts));
if (!counts)
die_out_of_memory();
}
counts[tcp->scno].calls++;
if (tcp->u_error)
counts[tcp->scno].errors++;
tv_sub(tv, tv, &tcp->etime);
if (tv_cmp(tv, &tcp->dtime) > 0) {
static struct timeval one_tick;
if (one_tick.tv_usec == 0) {
/* Initialize it. */
struct itimerval it;
memset(&it, 0, sizeof it);
it.it_interval.tv_usec = 1;
setitimer(ITIMER_REAL, &it, NULL);
getitimer(ITIMER_REAL, &it);
one_tick = it.it_interval;
}
if (tv_nz(&tcp->dtime))
*tv = tcp->dtime;
else if (tv_cmp(tv, &one_tick) > 0) {
if (tv_cmp(&shortest, &one_tick) < 0)
*tv = shortest;
else
*tv = one_tick;
}
}
if (tv_cmp(tv, &shortest) < 0)
shortest = *tv;
tv_add(&counts[tcp->scno].time, &counts[tcp->scno].time, tv);
}