#ifndef _TRACE_SYSCALL_H
  #define _TRACE_SYSCALL_H

  #include <linux/tracepoint.h>

  #include <linux/unistd.h>

  #include <linux/trace_events.h>

  #include <linux/thread_info.h>

  #include <asm/ptrace.h>

  /*
   * A syscall entry in the ftrace syscalls array.
   *
   * @name: name of the syscall

   * @syscall_nr: number of the syscall

   * @nb_args: number of parameters it takes
   * @types: list of types as strings
   * @args: list of args as strings (args[i] matches types[i])

   * @enter_fields: list of fields for syscall_enter trace event

   * @enter_event: associated syscall_enter trace event
   * @exit_event: associated syscall_exit trace event

   */
  struct syscall_metadata {
  	const char	*name;

  	int		syscall_nr;

  	int		nb_args;
  	const char	**types;
  	const char	**args;

  	struct list_head enter_fields;

  	struct trace_event_call *enter_event;
  	struct trace_event_call *exit_event;

  };

  #if defined(CONFIG_TRACEPOINTS) && defined(CONFIG_HAVE_SYSCALL_TRACEPOINTS)
  static inline void syscall_tracepoint_update(struct task_struct *p)
  {
  	if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
  		set_tsk_thread_flag(p, TIF_SYSCALL_TRACEPOINT);
  	else
  		clear_tsk_thread_flag(p, TIF_SYSCALL_TRACEPOINT);
  }
  #else
  static inline void syscall_tracepoint_update(struct task_struct *p)
  {
  }
  #endif

  #endif /* _TRACE_SYSCALL_H */