+ case OPT_BLOCKING_TIMEOUT:
+ {
+ long long v; /* in usec */
+ long long v_msec;
+
+ errno = 0;
+ opt_arg = poptGetOptArg(pc);
+ v = strtoll(opt_arg, NULL, 0);
+ if (errno != 0 || (!isdigit(opt_arg[0]) && opt_arg[0] != '-')
+ || v < -1) {
+ ERR("Wrong value in --blocking-timeout parameter: %s", opt_arg);
+ ret = CMD_ERROR;
+ goto end;
+ }
+ if (v >= 0) {
+ /*
+ * While LTTng-UST and LTTng-tools will accept
+ * a blocking timeout expressed in µs, the
+ * current tracer implementation relies on
+ * poll() which takes an "int timeout" parameter
+ * expressed in msec.
+ *
+ * Since the error reporting from the tracer
+ * is not precise, we perform this check here
+ * to provide a helpful error message in case of
+ * overflow.
+ *
+ * The setter (liblttng-ctl) also performs an
+ * equivalent check.
+ */
+ v_msec = v / 1000;
+ if (v_msec != (int32_t) v_msec) {
+ ERR("32-bit milliseconds overflow in --blocking-timeout parameter: %s", opt_arg);
+ ret = CMD_ERROR;
+ goto end;
+ }
+ } else if (v != -1) {
+ ERR("Invalid negative value passed as --blocking-timeout parameter; -1 (block forever) is the only valid negative value");
+ }
+ opt_blocking_timeout.value = (int64_t) v;
+ opt_blocking_timeout.set = true;
+ DBG("Channel blocking timeout set to %" PRId64 " (µs)",
+ opt_blocking_timeout.value);
+ break;
+ }