63 строки
1.3 KiB
C
63 строки
1.3 KiB
C
/* Copyright (c) 2017 Facebook
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of version 2 of the GNU General Public
|
|
* License as published by the Free Software Foundation.
|
|
*/
|
|
#include <uapi/linux/bpf.h>
|
|
#include "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 bpf_map_def SEC("maps") enter_open_map = {
|
|
.type = BPF_MAP_TYPE_ARRAY,
|
|
.key_size = sizeof(u32),
|
|
.value_size = sizeof(u32),
|
|
.max_entries = 1,
|
|
};
|
|
|
|
struct bpf_map_def SEC("maps") exit_open_map = {
|
|
.type = BPF_MAP_TYPE_ARRAY,
|
|
.key_size = sizeof(u32),
|
|
.value_size = sizeof(u32),
|
|
.max_entries = 1,
|
|
};
|
|
|
|
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((void *)&enter_open_map);
|
|
return 0;
|
|
}
|
|
|
|
SEC("tracepoint/syscalls/sys_exit_open")
|
|
int trace_enter_exit(struct syscalls_exit_open_args *ctx)
|
|
{
|
|
count((void *)&exit_open_map);
|
|
return 0;
|
|
}
|