int64_t readAtMost(ServerSocket &s, char *buf, int64_t max, int64_t atMost) {
const int64_t target = atMost < max ? atMost : max;
VLOG(3) << "readAtMost target " << target;
// because we want to process data as soon as it arrives, tryFull option for
// read is false
int64_t n = s.read(buf, target, false);
if (n < 0) {
PLOG(ERROR) << "Read error on " << s.getPort() << " with target " << target;
return n;
}
if (n == 0) {
LOG(WARNING) << "Eof on " << s.getFd();
return n;
}
VLOG(3) << "readAtMost " << n << " / " << atMost << " from " << s.getFd();
return n;
}
