Import kernel control interface

[lttng-tools.git] / liblttngctl / liblttngctl.c

diff --git a/liblttngctl/liblttngctl.c b/liblttngctl/liblttngctl.c
index 38be54774049532c8d9cef30a67c244454109b96..a2934e63c9644e3e70ae3b7309880b4857e9b2bd 100644 (file)
--- a/liblttngctl/liblttngctl.c
+++ b/liblttngctl/liblttngctl.c
@@ -158,6 +158,86 @@ end:
        return ret;
 }
 
+/*
+ * BEGIN KERNEL CONTROL
+ */
+
+/*
+ *  lttng_kernel_enable_event
+ *
+ *  Enable an event in the kernel tracer.
+ */
+int lttng_kernel_enable_event(char *event_name)
+{
+       strncpy(lsm.u.event.event_name, event_name, NAME_MAX);
+       return ask_sessiond(KERNEL_ENABLE_EVENT, NULL);
+}
+
+/*
+ *  lttng_kernel_disable_event
+ *
+ *  Disable an event in the kernel tracer.
+ */
+int lttng_kernel_disable_event(char *event_name)
+{
+       strncpy(lsm.u.event.event_name, event_name, NAME_MAX);
+       return ask_sessiond(KERNEL_DISABLE_EVENT, NULL);
+}
+
+/*
+ *  lttng_kernel_create_session
+ *
+ *  Create a session in the kernel tracer.
+ */
+int lttng_kernel_create_session(void)
+{
+       return ask_sessiond(KERNEL_CREATE_SESSION, NULL);
+}
+
+/*
+ *  lttng_kernel_create_channel
+ *
+ *  Create a channel in the kernel tracer.
+ */
+int lttng_kernel_create_channel(int overwrite,
+               u64 subbuf_size, u64 num_subbuf,
+               unsigned int switch_timer_interval,
+               unsigned int read_timer_interval)
+{
+       /* Write setting to the session message */
+       lsm.u.create_channel.overwrite = overwrite;
+       lsm.u.create_channel.subbuf_size = subbuf_size;
+       lsm.u.create_channel.num_subbuf = num_subbuf;
+       lsm.u.create_channel.switch_timer_interval = switch_timer_interval;
+       lsm.u.create_channel.read_timer_interval = read_timer_interval;
+
+       return ask_sessiond(KERNEL_CREATE_CHANNEL, NULL);
+}
+
+/*
+ *  lttng_kernel_start_tracing
+ *
+ *  Start kernel tracing.
+ */
+int lttng_kernel_start_tracing(void)
+{
+       return ask_sessiond(KERNEL_START_TRACE, NULL);
+}
+
+/*
+ *  lttng_kernel_stop_tracing
+ *
+ *  Stop kernel tracing.
+ */
+int lttng_kernel_stop_tracing(void)
+{
+       return ask_sessiond(KERNEL_STOP_TRACE, NULL);
+}
+
+/*
+ * END KERNEL CONTROL
+ */
+
 /*
  *  lttng_get_readable_code
  *
@@ -431,7 +511,7 @@ static int set_session_daemon_path(void)
 
        /* Are we in the tracing group ? */
        ret = check_tracing_group(tracing_group);
-       if (ret < 0) {
+       if (ret < 0 && getuid() != 0) {
                if (sprintf(sessiond_sock_path, DEFAULT_HOME_CLIENT_UNIX_SOCK,
                                        getenv("HOME")) < 0) {
                        return -ENOMEM;