Add tracepoint listing ABI

[lttng-modules.git] / ltt-debugfs-abi.c

diff --git a/ltt-debugfs-abi.c b/ltt-debugfs-abi.c
index db2aebc34170d5364fc0a5fd72cdeea2f22a2c3c..c5ca63253b45575cca7e9e2c1f69b8c5a2b16e8d 100644 (file)
--- a/ltt-debugfs-abi.c
+++ b/ltt-debugfs-abi.c
@@ -84,6 +84,33 @@ fd_error:
        return ret;
 }
 
+static
+int lttng_abi_tracepoint_list(void)
+{
+       struct file *tracepoint_list_file;
+       int file_fd, ret;
+
+       file_fd = get_unused_fd();
+       if (file_fd < 0) {
+               ret = file_fd;
+               goto fd_error;
+       }
+       tracepoint_list_file = anon_inode_getfile("[lttng_session]",
+                                         &lttng_tracepoint_list_fops,
+                                         NULL, O_RDWR);
+       if (IS_ERR(tracepoint_list_file)) {
+               ret = PTR_ERR(tracepoint_list_file);
+               goto file_error;
+       }
+       fd_install(file_fd, tracepoint_list_file);
+       return file_fd;
+
+file_error:
+       put_unused_fd(file_fd);
+fd_error:
+       return ret;
+}
+
 static
 long lttng_abi_tracer_version(struct file *file, 
        struct lttng_kernel_tracer_version __user *uversion_param)
@@ -109,6 +136,10 @@ long lttng_abi_tracer_version(struct file *file,
  *     This ioctl implements lttng commands:
  *     LTTNG_KERNEL_SESSION
  *             Returns a LTTng trace session file descriptor
+ *     LTTNG_KERNEL_TRACER_VERSION
+ *             Returns the LTTng kernel tracer version
+ *     LTTNG_KERNEL_TRACEPOINT_LIST
+ *             Returns a file descriptor listing available tracepoints
  *
  * The returned session will be deleted when its file descriptor is closed.
  */
@@ -121,6 +152,8 @@ long lttng_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
        case LTTNG_KERNEL_TRACER_VERSION:
                return lttng_abi_tracer_version(file,
                                (struct lttng_kernel_tracer_version __user *) arg);
+       case LTTNG_KERNEL_TRACEPOINT_LIST:
+               return lttng_abi_tracepoint_list();
        default:
                return -ENOIOCTLCMD;
        }
@@ -155,8 +188,8 @@ void lttng_metadata_create_events(struct file *channel_file)
         */
        event = ltt_event_create(channel, &metadata_params, NULL);
        if (!event) {
-               goto create_error;
                ret = -EINVAL;
+               goto create_error;
        }
        return;
 
@@ -389,7 +422,7 @@ int lttng_abi_create_event(struct file *channel_file,
         */
        event = ltt_event_create(channel, &event_param, NULL);
        if (!event) {
-               ret = -EEXIST;
+               ret = -EINVAL;
                goto event_error;
        }
        event_file->private_data = event;