Support syscall event in save session
authorDavid Goulet <dgoulet@efficios.com>
Mon, 29 Sep 2014 14:55:33 +0000 (10:55 -0400)
committerDavid Goulet <dgoulet@efficios.com>
Mon, 29 Sep 2014 18:40:22 +0000 (14:40 -0400)
Signed-off-by: David Goulet <dgoulet@efficios.com>
src/bin/lttng-sessiond/save.c

index 2c38df97292fd34fc3619d0c8bdc20d15a1ac1d6..d3fb7b8f3f1dd8816a11a3d914488dfc8cbcb7e5 100644 (file)
@@ -31,6 +31,7 @@
 
 #include "save.h"
 #include "session.h"
+#include "syscall.h"
 #include "trace-ust.h"
 
 static
@@ -370,6 +371,7 @@ int save_kernel_event(struct config_writer *writer,
                }
 
                switch (event->event->instrumentation) {
+               case LTTNG_KERNEL_SYSCALL:
                case LTTNG_KERNEL_FUNCTION:
                        ret = config_writer_open_element(writer,
                                config_element_function_attributes);
@@ -483,9 +485,54 @@ end:
        return ret;
 }
 
+static
+int save_kernel_syscall(struct config_writer *writer,
+               struct ltt_kernel_channel *kchan)
+{
+       int ret, i;
+       ssize_t count;
+       struct lttng_event *events = NULL;
+
+       assert(writer);
+       assert(kchan);
+
+       count = syscall_list_channel(kchan, &events, 0);
+       if (!count) {
+               /* No syscalls, just gracefully return. */
+               ret = 0;
+               goto end;
+       }
+
+       for (i = 0; i < count; i++) {
+               struct ltt_kernel_event *kevent;
+
+               /* Create a temporary kevent in order to save it. */
+               kevent = trace_kernel_create_event(&events[i]);
+               if (!kevent) {
+                       ret = -ENOMEM;
+                       goto end;
+               }
+               /* Init list in order so the destroy call can del the node. */
+               CDS_INIT_LIST_HEAD(&kevent->list);
+
+               ret = save_kernel_event(writer, kevent);
+               trace_kernel_destroy_event(kevent);
+               if (ret) {
+                       goto end;
+               }
+       }
+
+       /* Everything went well */
+       ret = 0;
+
+end:
+       free(events);
+       return ret;
+}
+
 static
 int save_kernel_events(struct config_writer *writer,
-       struct ltt_kernel_event_list *event_list)
+       struct ltt_kernel_channel *kchan)
 {
        int ret;
        struct ltt_kernel_event *event;
@@ -496,13 +543,19 @@ int save_kernel_events(struct config_writer *writer,
                goto end;
        }
 
-       cds_list_for_each_entry(event, &event_list->head, list) {
+       cds_list_for_each_entry(event, &kchan->events_list.head, list) {
                ret = save_kernel_event(writer, event);
                if (ret) {
                        goto end;
                }
        }
 
+       /* Save syscalls if any. */
+       ret = save_kernel_syscall(writer, kchan);
+       if (ret) {
+               goto end;
+       }
+
        /* /events */
        ret = config_writer_close_element(writer);
        if (ret) {
@@ -861,7 +914,7 @@ int save_kernel_channel(struct config_writer *writer,
                goto end;
        }
 
-       ret = save_kernel_events(writer, &kchan->events_list);
+       ret = save_kernel_events(writer, kchan);
        if (ret) {
                goto end;
        }
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