// SPDX-License-Identifier: GPL-2.0-only

  /* Copyright (c) 2017 Facebook

   */
  #include <uapi/linux/bpf.h>

  #include <bpf/bpf_helpers.h>

  
  struct syscalls_enter_open_args {
  	unsigned long long unused;
  	long syscall_nr;
  	long filename_ptr;
  	long flags;
  	long mode;
  };
  
  struct syscalls_exit_open_args {
  	unsigned long long unused;
  	long syscall_nr;
  	long ret;
  };

  struct {
  	__uint(type, BPF_MAP_TYPE_ARRAY);
  	__type(key, u32);
  	__type(value, u32);
  	__uint(max_entries, 1);
  } enter_open_map SEC(".maps");

  struct {
  	__uint(type, BPF_MAP_TYPE_ARRAY);
  	__type(key, u32);
  	__type(value, u32);
  	__uint(max_entries, 1);
  } exit_open_map SEC(".maps");

  
  static __always_inline void count(void *map)
  {
  	u32 key = 0;
  	u32 *value, init_val = 1;
  
  	value = bpf_map_lookup_elem(map, &key);
  	if (value)
  		*value += 1;
  	else
  		bpf_map_update_elem(map, &key, &init_val, BPF_NOEXIST);
  }
  
  SEC("tracepoint/syscalls/sys_enter_open")
  int trace_enter_open(struct syscalls_enter_open_args *ctx)
  {

  	count(&enter_open_map);
  	return 0;
  }
  
  SEC("tracepoint/syscalls/sys_enter_openat")
  int trace_enter_open_at(struct syscalls_enter_open_args *ctx)
  {
  	count(&enter_open_map);

  	return 0;
  }
  
  SEC("tracepoint/syscalls/sys_exit_open")
  int trace_enter_exit(struct syscalls_exit_open_args *ctx)
  {

  	count(&exit_open_map);
  	return 0;
  }
  
  SEC("tracepoint/syscalls/sys_exit_openat")
  int trace_enter_exit_at(struct syscalls_exit_open_args *ctx)
  {
  	count(&exit_open_map);

  	return 0;
  }