Resource usage data is filled by the kernel only when wait4 returns
a pid, i.e. a positive value.
Commit
5850546e9669f793aab61dfc7c4f2c1ff35c4b29 introduced this bug,
possibly because of copy-pasting from getrusage.
if (ru) {
long long kru64[18];
r = __syscall(SYS_wait4_time64, pid, status, options, kru64);
if (ru) {
long long kru64[18];
r = __syscall(SYS_wait4_time64, pid, status, options, kru64);
ru->ru_utime = (struct timeval)
{ .tv_sec = kru64[0], .tv_usec = kru64[1] };
ru->ru_stime = (struct timeval)
ru->ru_utime = (struct timeval)
{ .tv_sec = kru64[0], .tv_usec = kru64[1] };
ru->ru_stime = (struct timeval)