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36 lines
1.1 KiB
36 lines
1.1 KiB
#!/usr/bin/env bcc-lua
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--[[
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Copyright 2016 Marek Vavrusa <mvavrusa@cloudflare.com>
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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]]
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-- Simple tracing example that executes a program on
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-- return from sys_write() and tracks the number of hits
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local ffi = require('ffi')
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local bpf = require('bpf')
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local S = require('syscall')
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-- Shared part of the program
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local map = bpf.map('array', 1)
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-- Kernel-space part of the program
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local probe = bpf.kprobe('myprobe:sys_write', function (ptregs)
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xadd(map[0], 1)
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end, true)
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-- User-space part of the program
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pcall(function()
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for _ = 1, 10 do
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print('hits: ', tonumber(map[0]))
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S.sleep(1)
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end
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end)
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