Truncate exclusion names to have a terminal '\0'

[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 4332881c6eb7a41f538189a3dd3dcc41aed0ae30..665aba57d7cb80f37656c670fe6d3760747eb7a0 100644 (file)
--- a/src/lib/lttng-ctl/lttng-ctl.c
+++ b/src/lib/lttng-ctl/lttng-ctl.c
@@ -19,7 +19,6 @@
  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
-#define _GNU_SOURCE
 #define _LGPL_SOURCE
 #include <assert.h>
 #include <grp.h>
@@ -759,7 +758,7 @@ error:
 }
 
 /*
- * Generate the filter bytecode from a give filter expression string. Put the
+ * Generate the filter bytecode from a given filter expression string. Put the
  * newly allocated parser context in ctxp and populate the lsm object with the
  * expression len.
  *
@@ -1000,7 +999,8 @@ int lttng_enable_event_with_exclusions(struct lttng_handle *handle,
        /* Put exclusion names first in the data */
        while (exclusion_count--) {
                strncpy(varlen_data + LTTNG_SYMBOL_NAME_LEN * exclusion_count,
-                       *(exclusion_list + exclusion_count), LTTNG_SYMBOL_NAME_LEN);
+                       *(exclusion_list + exclusion_count),
+                       LTTNG_SYMBOL_NAME_LEN - 1);
        }
        /* Add filter expression next */
        if (lsm.u.enable.expression_len != 0) {
@@ -1091,10 +1091,6 @@ int lttng_disable_event_ext(struct lttng_handle *handle,
        }
 
        lsm.cmd_type = LTTNG_DISABLE_EVENT;
-       if (ev->name[0] == '\0') {
-               /* Disable all events */
-               lttng_ctl_copy_string(ev->name, "*", sizeof(ev->name));
-       }
 
        lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
        /* FIXME: copying non-packed struct to packed struct. */
@@ -1280,6 +1276,62 @@ int lttng_disable_channel(struct lttng_handle *handle, const char *name)
        return lttng_ctl_ask_sessiond(&lsm, NULL);
 }
 
+/*
+ *  Add PID to session tracker.
+ *  Return 0 on success else a negative LTTng error code.
+ */
+int lttng_track_pid(struct lttng_handle *handle, int pid)
+{
+       struct lttcomm_session_msg lsm;
+
+       /*
+        * NULL arguments are forbidden. No default values.
+        */
+       if (handle == NULL) {
+               return -LTTNG_ERR_INVALID;
+       }
+
+       memset(&lsm, 0, sizeof(lsm));
+
+       lsm.cmd_type = LTTNG_TRACK_PID;
+       lsm.u.pid_tracker.pid = pid;
+
+       lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
+
+       lttng_ctl_copy_string(lsm.session.name, handle->session_name,
+                       sizeof(lsm.session.name));
+
+       return lttng_ctl_ask_sessiond(&lsm, NULL);
+}
+
+/*
+ *  Remove PID from session tracker.
+ *  Return 0 on success else a negative LTTng error code.
+ */
+int lttng_untrack_pid(struct lttng_handle *handle, int pid)
+{
+       struct lttcomm_session_msg lsm;
+
+       /*
+        * NULL arguments are forbidden. No default values.
+        */
+       if (handle == NULL) {
+               return -LTTNG_ERR_INVALID;
+       }
+
+       memset(&lsm, 0, sizeof(lsm));
+
+       lsm.cmd_type = LTTNG_UNTRACK_PID;
+       lsm.u.pid_tracker.pid = pid;
+
+       lttng_ctl_copy_lttng_domain(&lsm.domain, &handle->domain);
+
+       lttng_ctl_copy_string(lsm.session.name, handle->session_name,
+                       sizeof(lsm.session.name));
+
+       return lttng_ctl_ask_sessiond(&lsm, NULL);
+}
+
 /*
  *  Lists all available tracepoints of domain.
  *  Sets the contents of the events array.
@@ -1824,6 +1876,7 @@ int lttng_data_pending(const char *session_name)
 {
        int ret;
        struct lttcomm_session_msg lsm;
+       uint8_t *pending = NULL;
 
        if (session_name == NULL) {
                return -LTTNG_ERR_INVALID;
@@ -1835,18 +1888,18 @@ int lttng_data_pending(const char *session_name)
        lttng_ctl_copy_string(lsm.session.name, session_name,
                        sizeof(lsm.session.name));
 
-       ret = lttng_ctl_ask_sessiond(&lsm, NULL);
-
-       /*
-        * The lttng_ctl_ask_sessiond function negate the return code if it's not
-        * LTTNG_OK so getting -1 means that the reply ret_code was 1 thus meaning
-        * that the data is available. Yes it is hackish but for now this is the
-        * only way.
-        */
-       if (ret == -1) {
-               ret = 1;
+       ret = lttng_ctl_ask_sessiond(&lsm, (void **) &pending);
+       if (ret < 0) {
+               goto end;
+       } else if (ret != 1) {
+               /* Unexpected payload size */
+               ret = -LTTNG_ERR_INVALID;
+               goto end;
        }
 
+       ret = (int) *pending;
+end:
+       free(pending);
        return ret;
 }
 
@@ -1898,7 +1951,7 @@ int lttng_create_session_live(const char *name, const char *url,
        struct lttcomm_session_msg lsm;
        struct lttng_uri *uris = NULL;
 
-       if (name == NULL) {
+       if (name == NULL || timer_interval == 0) {
                return -LTTNG_ERR_INVALID;
        }
 
@@ -1934,6 +1987,52 @@ 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;
+       int 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
  */