Introduce "--blocking-timeout" channel parameter

[lttng-tools.git] / src / lib / lttng-ctl / lttng-ctl.c

diff --git a/src/lib/lttng-ctl/lttng-ctl.c b/src/lib/lttng-ctl/lttng-ctl.c
index a8c6c9b24adc33a3b13a14b2f206ffea5edc8230..a1e10f25e82176393f92206c2779d09355c063e6 100644 (file)
--- a/src/lib/lttng-ctl/lttng-ctl.c
+++ b/src/lib/lttng-ctl/lttng-ctl.c
@@ -2073,6 +2073,8 @@ void lttng_channel_set_default_attr(struct lttng_domain *domain,
                if (extended) {
                        extended->monitor_timer_interval =
                                        DEFAULT_KERNEL_CHANNEL_MONITOR_TIMER;
+                       extended->blocking_timeout =
+                                       DEFAULT_KERNEL_CHANNEL_BLOCKING_TIMEOUT;
                }
                break;
        case LTTNG_DOMAIN_UST:
@@ -2088,6 +2090,8 @@ void lttng_channel_set_default_attr(struct lttng_domain *domain,
                        if (extended) {
                                extended->monitor_timer_interval =
                                                DEFAULT_UST_UID_CHANNEL_MONITOR_TIMER;
+                               extended->blocking_timeout =
+                                               DEFAULT_UST_UID_CHANNEL_BLOCKING_TIMEOUT;
                        }
                        break;
                case LTTNG_BUFFER_PER_PID:
@@ -2102,6 +2106,8 @@ void lttng_channel_set_default_attr(struct lttng_domain *domain,
                        if (extended) {
                                extended->monitor_timer_interval =
                                                DEFAULT_UST_PID_CHANNEL_MONITOR_TIMER;
+                               extended->blocking_timeout =
+                                               DEFAULT_UST_PID_CHANNEL_BLOCKING_TIMEOUT;
                        }
                        break;
                }
@@ -2203,6 +2209,61 @@ end:
        return ret;
 }
 
+int lttng_channel_get_blocking_timeout(struct lttng_channel *chan,
+               int64_t *blocking_timeout)
+{
+       int ret = 0;
+
+       if (!chan || !blocking_timeout) {
+               ret = -LTTNG_ERR_INVALID;
+               goto end;
+       }
+
+       if (!chan->attr.extended.ptr) {
+               ret = -LTTNG_ERR_INVALID;
+               goto end;
+       }
+
+       *blocking_timeout = ((struct lttng_channel_extended *)
+                       chan->attr.extended.ptr)->blocking_timeout;
+end:
+       return ret;
+}
+
+int lttng_channel_set_blocking_timeout(struct lttng_channel *chan,
+               int64_t blocking_timeout)
+{
+       int ret = 0;
+       int64_t msec_timeout;
+
+       if (!chan || !chan->attr.extended.ptr) {
+               ret = -LTTNG_ERR_INVALID;
+               goto end;
+       }
+
+       if (blocking_timeout < 0 && blocking_timeout != -1) {
+               ret = -LTTNG_ERR_INVALID;
+               goto end;
+       }
+
+       /*
+        * LTTng-ust's use of poll() to implement this timeout mechanism forces
+        * us to accept a narrower range of values (msecs expressed as a signed
+        * 32-bit integer).
+        */
+       msec_timeout = blocking_timeout / 1000;
+       if (msec_timeout != (int32_t) msec_timeout) {
+               ret = -LTTNG_ERR_INVALID;
+               goto end;
+       }
+
+       ((struct lttng_channel_extended *)
+                       chan->attr.extended.ptr)->blocking_timeout =
+                       blocking_timeout;
+end:
+       return ret;
+}
+
 /*
  * Check if session daemon is alive.
  *