#ifndef _TRACE_SYSCALL_H
  #define _TRACE_SYSCALL_H
  
  #include <linux/tracepoint.h>
  #include <linux/unistd.h>
  #include <linux/ftrace_event.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 ftrace_event_call *enter_event;
  	struct ftrace_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 */