Clean-up: modernize pretty_xml.cpp

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

diff --git a/src/lib/lttng-ctl/lttng-ctl.cpp b/src/lib/lttng-ctl/lttng-ctl.cpp
index b9311a07ef2051bfeb6243e071f381aef3f90379..bbc94828e6c828e7b7a9acbe90080654d714202a 100644 (file)
--- a/src/lib/lttng-ctl/lttng-ctl.cpp
+++ b/src/lib/lttng-ctl/lttng-ctl.cpp
@@ -24,6 +24,7 @@
 #include <common/filter/filter-ast.hpp>
 #include <common/filter/filter-parser.hpp>
 #include <common/filter/memstream.hpp>
+#include <common/make-unique-wrapper.hpp>
 #include <common/payload-view.hpp>
 #include <common/payload.hpp>
 #include <common/sessiond-comm/sessiond-comm.hpp>
@@ -52,12 +53,12 @@
 #include <string.h>
 #include <unistd.h>
 
-#define COPY_DOMAIN_PACKED(dst, src)                             \
-       do {                                                     \
-               struct lttng_domain _tmp_domain;                 \
-                                                                 \
-               lttng_ctl_copy_lttng_domain(&_tmp_domain, &src); \
-               dst = _tmp_domain;                               \
+#define COPY_DOMAIN_PACKED(dst, src)                               \
+       do {                                                       \
+               struct lttng_domain _tmp_domain;                   \
+                                                                   \
+               lttng_ctl_copy_lttng_domain(&_tmp_domain, &(src)); \
+               (dst) = _tmp_domain;                               \
        } while (0)
 
 /* Socket to session daemon for communication */
@@ -2877,6 +2878,34 @@ end:
        return ret;
 }
 
+/*
+ * Get the status of the kernel tracer
+ *
+ * Sets the value of the argument
+ */
+enum lttng_error_code lttng_get_kernel_tracer_status(enum lttng_kernel_tracer_status *out_status)
+{
+       if (out_status == nullptr) {
+               return LTTNG_ERR_INVALID;
+       }
+
+       struct lttcomm_session_msg lsm = {};
+       lsm.cmd_type = LTTCOMM_SESSIOND_COMMAND_KERNEL_TRACER_STATUS;
+
+       uint32_t *raw_tracer_status = nullptr;
+       const auto ask_ret = lttng_ctl_ask_sessiond(&lsm, (void **) &raw_tracer_status);
+
+       const auto tracer_status =
+               lttng::make_unique_wrapper<uint32_t, lttng::memory::free>(raw_tracer_status);
+
+       if (ask_ret != 4) {
+               return LTTNG_ERR_INVALID;
+       }
+
+       *out_status = (enum lttng_kernel_tracer_status) * tracer_status;
+       return LTTNG_OK;
+}
+
 /*
  * Regenerate the metadata for a session.
  * Return 0 on success, a negative error code on error.