Add functions and command line for listing trace_events v3

[ust.git] / libustcmd / ustcmd.c

diff --git a/libustcmd/ustcmd.c b/libustcmd/ustcmd.c
index f0a6ae0a25059cfcaead24f313c0b926e5ccb02a..4248072b4705d0ca384982dcbd1acb2a68f4b01e 100644 (file)
--- a/libustcmd/ustcmd.c
+++ b/libustcmd/ustcmd.c
@@ -438,6 +438,83 @@ int ustcmd_get_cmsf(struct marker_status **cmsf, const pid_t pid)
        return 0;
 }
 
+
+/**
+ * Frees a TES array.
+ *
+ * @param tes  TES array to free
+ * @return     0 if successful, or error USTCMD_ERR_ARG
+ */
+int ustcmd_free_tes(struct trace_event_status *tes)
+{
+       if (tes == NULL) {
+               return USTCMD_ERR_ARG;
+       }
+
+       unsigned int i = 0;
+       while (tes[i].name != NULL) {
+               free(tes[i].name);
+               ++i;
+       }
+       free(tes);
+
+       return 0;
+}
+
+/**
+ * Gets trace_events string for a given PID.
+ *
+ * @param tes  Pointer to TES array to be filled (callee allocates, caller
+ *             frees with `ustcmd_free_tes')
+ * @param pid  Targeted PID
+ * @return     0 if successful, or -1 on error
+ */
+int ustcmd_get_tes(struct trace_event_status **tes,
+                           const pid_t pid)
+{
+       char *big_str = NULL;
+       int result;
+       struct trace_event_status *tmp_tes = NULL;
+       unsigned int i = 0, tes_ind = 0;
+
+       if (tes == NULL) {
+               return -1;
+       }
+
+       result = ustcmd_send_cmd("list_trace_events", pid, &big_str);
+       if (result != 1) {
+               ERR("error while getting trace_event list");
+               return -1;
+       }
+
+       tmp_tes = (struct trace_event_status *)
+               zmalloc(sizeof(struct trace_event_status) *
+                       (ustcmd_count_nl(big_str) + 1));
+       if (tmp_tes == NULL) {
+               ERR("Failed to allocate TES array");
+               return -1;
+       }
+
+       /* Parse received reply string (format: "[name]"): */
+       while (big_str[i] != '\0') {
+               char state;
+
+               sscanf(big_str + i, "trace_event: %a[^\n]",
+                       &tmp_tes[tes_ind].name);
+               while (big_str[i] != '\n') {
+                       ++i; /* Go to next '\n' */
+               }
+               ++i; /* Skip current pointed '\n' */
+               ++tes_ind;
+       }
+       tmp_tes[tes_ind].name = NULL;
+
+       *tes = tmp_tes;
+
+       free(big_str);
+       return 0;
+}
+
 /**
  * Set socket path
  *