| #!/usr/bin/env bcc-lua |
| --[[ |
| Copyright 2016 GitHub, Inc |
| |
| Licensed under the Apache License, Version 2.0 (the "License"); |
| you may not use this file except in compliance with the License. |
| You may obtain a copy of the License at |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, software |
| distributed under the License is distributed on an "AS IS" BASIS, |
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| See the License for the specific language governing permissions and |
| limitations under the License. |
| ]] |
| |
| local program = [[ |
| #include <uapi/linux/ptrace.h> |
| int trace_method(struct pt_regs *ctx) { |
| uint64_t addr; |
| bpf_usdt_readarg(2, ctx, &addr); |
| |
| char fn_name[128] = {}; |
| bpf_probe_read_user(&fn_name, sizeof(fn_name), (void *)addr); |
| |
| bpf_trace_printk("%s(...)\n", fn_name); |
| return 0; |
| }; |
| ]] |
| |
| return function(BPF, util) |
| if not arg[1] then |
| print("usage: rubysyms.lua PID") |
| return |
| end |
| |
| local u = util.USDT:new{pid=tonumber(arg[1])} |
| u:enable_probe{probe="method__entry", fn_name="trace_method"} |
| |
| local b = BPF:new{text=program, usdt=u} |
| local pipe = b:pipe() |
| while true do |
| print(pipe:trace_fields()) |
| end |
| end |