X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Flib%2Flttng-ctl%2Flttng-ctl.c;h=004b0ccebf1c7b24e49674e2f3d66d53bfde7abe;hp=c2210f48aa484c94393003e9f5b782ddbc5770c4;hb=a5dfbb9db7ba31913657ed921006b13977b7b426;hpb=a9ad0c8fb50ac8cf9e9812dd9c9b4f949bac19a8

diff --git a/src/lib/lttng-ctl/lttng-ctl.c b/src/lib/lttng-ctl/lttng-ctl.c
index c2210f48a..004b0cceb 100644
--- a/src/lib/lttng-ctl/lttng-ctl.c
+++ b/src/lib/lttng-ctl/lttng-ctl.c
@@ -1990,6 +1990,51 @@ end:
 	return ret;
 }
 
+/*
+ * List PIDs in the tracker.
+ *
+ * @enabled is set to whether the PID tracker is enabled.
+ * @pids is set to an allocated array of PIDs currently tracked. On
+ * success, @pids must be freed by the caller.
+ * @nr_pids is set to the number of entries contained by the @pids array.
+ *
+ * Returns 0 on success, else a negative LTTng error code.
+ */
+int lttng_list_tracker_pids(struct lttng_handle *handle,
+		int *_enabled, int32_t **_pids, size_t *_nr_pids)
+{
+	int ret, enabled = 1;
+	struct lttcomm_session_msg lsm;
+	size_t nr_pids;
+	int32_t *pids;
+
+	if (handle == NULL) {
+		return -LTTNG_ERR_INVALID;
+	}
+
+	memset(&lsm, 0, sizeof(lsm));
+	lsm.cmd_type = LTTNG_LIST_TRACKER_PIDS;
+	lttng_ctl_copy_string(lsm.session.name, handle->session_name,
+			sizeof(lsm.session.name));
+	lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
+
+	ret = lttng_ctl_ask_sessiond(&lsm, (void **) &pids);
+	if (ret < 0) {
+		return ret;
+	}
+	nr_pids = ret / sizeof(int32_t);
+	if (nr_pids == 1 && pids[0] == -1) {
+		free(pids);
+		pids = NULL;
+		enabled = 0;
+		nr_pids = 0;
+	}
+	*_enabled = enabled;
+	*_pids = pids;
+	*_nr_pids = nr_pids;
+	return 0;
+}
+
 /*
  * lib constructor
  */