* - Takes an instrumentation source as parameter
* - e.g. tracepoints, dynamic_probes...
* - Takes instrumentation source specific arguments.
+ *
+ * Dual LGPL v2.1/GPL v2 license.
*/
#include <linux/module.h>
ret = file_fd;
goto fd_error;
}
+
tracepoint_list_file = anon_inode_getfile("[lttng_session]",
<tng_tracepoint_list_fops,
NULL, O_RDWR);
ret = PTR_ERR(tracepoint_list_file);
goto file_error;
}
+ ret = lttng_tracepoint_list_fops.open(NULL, tracepoint_list_file);
+ if (ret < 0)
+ goto open_error;
fd_install(file_fd, tracepoint_list_file);
+ if (file_fd < 0) {
+ ret = file_fd;
+ goto fd_error;
+ }
return file_fd;
+open_error:
+ fput(tracepoint_list_file);
file_error:
put_unused_fd(file_fd);
fd_error:
return 0;
}
+static
+long lttng_abi_add_context(struct file *file,
+ struct lttng_kernel_context __user *ucontext_param,
+ struct lttng_ctx **ctx, struct ltt_session *session)
+{
+ struct lttng_kernel_context context_param;
+
+ if (session->been_active)
+ return -EPERM;
+
+ if (copy_from_user(&context_param, ucontext_param, sizeof(context_param)))
+ return -EFAULT;
+
+ switch (context_param.ctx) {
+ case LTTNG_KERNEL_CONTEXT_PID:
+ return lttng_add_pid_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_PRIO:
+ return lttng_add_prio_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_NICE:
+ return lttng_add_nice_to_ctx(ctx);
+ case LTTNG_KERNEL_CONTEXT_PERF_COUNTER:
+ return -ENOSYS;
+ case LTTNG_KERNEL_CONTEXT_COMM:
+ return lttng_add_comm_to_ctx(ctx);
+ default:
+ return -EINVAL;
+ }
+}
+
/**
* lttng_ioctl - lttng syscall through ioctl
*
* This ioctl implements lttng commands:
* LTTNG_KERNEL_CHANNEL
* Returns a LTTng channel file descriptor
+ * LTTNG_KERNEL_SESSION_START
+ * Starts tracing session
+ * LTTNG_KERNEL_SESSION_STOP
+ * Stops tracing session
+ * LTTNG_KERNEL_METADATA
+ * Returns a LTTng metadata file descriptor
*
* The returned channel will be deleted when its file descriptor is closed.
*/
* (typically, one event stream records events from one CPU)
* LTTNG_KERNEL_EVENT
* Returns an event file descriptor or failure.
+ * LTTNG_KERNEL_CONTEXT
+ * Prepend a context field to each event in the channel
*
* Channel and event file descriptors also hold a reference on the session.
*/
static
long lttng_channel_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
+ struct ltt_channel *channel = file->private_data;
+
switch (cmd) {
case LTTNG_KERNEL_STREAM:
return lttng_abi_open_stream(file);
case LTTNG_KERNEL_EVENT:
return lttng_abi_create_event(file, (struct lttng_kernel_event __user *) arg);
+ case LTTNG_KERNEL_CONTEXT:
+ return lttng_abi_add_context(file,
+ (struct lttng_kernel_context __user *) arg,
+ &channel->ctx, channel->session);
default:
return -ENOIOCTLCMD;
}
#endif
};
+/**
+ * lttng_event_ioctl - lttng syscall through ioctl
+ *
+ * @file: the file
+ * @cmd: the command
+ * @arg: command arg
+ *
+ * This ioctl implements lttng commands:
+ * LTTNG_KERNEL_STREAM
+ * Returns an event stream file descriptor or failure.
+ * (typically, one event stream records events from one CPU)
+ * LTTNG_KERNEL_EVENT
+ * Returns an event file descriptor or failure.
+ * LTTNG_KERNEL_CONTEXT
+ * Prepend a context field to each record of this event
+ */
+static
+long lttng_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ struct ltt_event *event = file->private_data;
+
+ switch (cmd) {
+ case LTTNG_KERNEL_CONTEXT:
+ return lttng_abi_add_context(file,
+ (struct lttng_kernel_context __user *) arg,
+ &event->ctx, event->chan->session);
+ default:
+ return -ENOIOCTLCMD;
+ }
+}
+
static
int lttng_event_release(struct inode *inode, struct file *file)
{
/* TODO: filter control ioctl */
static const struct file_operations lttng_event_fops = {
.release = lttng_event_release,
+ .unlocked_ioctl = lttng_event_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = lttng_event_ioctl,
+#endif
};
int __init ltt_debugfs_abi_init(void)