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45 lines
1.3 KiB
45 lines
1.3 KiB
#!/usr/bin/env bcc-lua
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--[[
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Copyright 2016 GitHub, Inc
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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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assert(arg[1], "usage: strlen_count PID")
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local program = string.gsub([[
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#include <uapi/linux/ptrace.h>
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int printarg(struct pt_regs *ctx) {
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if (!PT_REGS_PARM1(ctx))
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return 0;
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u32 pid = bpf_get_current_pid_tgid();
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if (pid != PID)
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return 0;
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char str[128] = {};
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bpf_probe_read(&str, sizeof(str), (void *)PT_REGS_PARM1(ctx));
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bpf_trace_printk("strlen(\"%s\")\n", &str);
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return 0;
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};
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]], "PID", arg[1])
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return function(BPF)
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local b = BPF:new{text=program, debug=0}
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b:attach_uprobe{name="c", sym="strlen", fn_name="printarg"}
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local pipe = b:pipe()
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while true do
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local task, pid, cpu, flags, ts, msg = pipe:trace_fields()
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print("%-18.9f %-16s %-6d %s" % {ts, task, pid, msg})
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end
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end
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