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119 lines
3.0 KiB
119 lines
3.0 KiB
7 months ago
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#!/usr/bin/env python
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# @lint-avoid-python-3-compatibility-imports
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#
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# statsnoop Trace stat() syscalls.
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# For Linux, uses BCC, eBPF. Embedded C.
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#
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# USAGE: statsnoop [-h] [-t] [-x] [-p PID]
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#
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# Copyright 2016 Netflix, Inc.
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# Licensed under the Apache License, Version 2.0 (the "License")
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#
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# 08-Feb-2016 Brendan Gregg Created this.
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from __future__ import print_function
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from bcc import BPF
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import argparse
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# arguments
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examples = """examples:
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./statsnoop # trace all stat() syscalls
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./statsnoop -t # include timestamps
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./statsnoop -x # only show failed stats
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./statsnoop -p 181 # only trace PID 181
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"""
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parser = argparse.ArgumentParser(
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description="Trace stat() syscalls",
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formatter_class=argparse.RawDescriptionHelpFormatter,
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epilog=examples)
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parser.add_argument("-t", "--timestamp", action="store_true",
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help="include timestamp on output")
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parser.add_argument("-x", "--failed", action="store_true",
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help="only show failed stats")
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parser.add_argument("-p", "--pid",
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help="trace this PID only")
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args = parser.parse_args()
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debug = 0
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# define BPF program
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bpf_text = """
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#include <uapi/linux/ptrace.h>
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BPF_HASH(args_filename, u32, const char *);
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int trace_entry(struct pt_regs *ctx, const char __user *filename)
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{
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u32 pid = bpf_get_current_pid_tgid();
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FILTER
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args_filename.update(&pid, &filename);
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return 0;
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};
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int trace_return(struct pt_regs *ctx)
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{
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const char **filenamep;
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int ret = ctx->ax;
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u32 pid = bpf_get_current_pid_tgid();
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filenamep = args_filename.lookup(&pid);
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if (filenamep == 0) {
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// missed entry
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return 0;
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}
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bpf_trace_printk("%d %s\\n", ret, *filenamep);
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args_filename.delete(&pid);
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return 0;
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}
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"""
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if args.pid:
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bpf_text = bpf_text.replace('FILTER',
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'if (pid != %s) { return 0; }' % args.pid)
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else:
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bpf_text = bpf_text.replace('FILTER', '')
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if debug:
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print(bpf_text)
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# initialize BPF
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b = BPF(text=bpf_text)
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b.attach_kprobe(event="sys_stat", fn_name="trace_entry")
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b.attach_kprobe(event="sys_statfs", fn_name="trace_entry")
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b.attach_kprobe(event="sys_newstat", fn_name="trace_entry")
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b.attach_kretprobe(event="sys_stat", fn_name="trace_return")
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b.attach_kretprobe(event="sys_statfs", fn_name="trace_return")
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b.attach_kretprobe(event="sys_newstat", fn_name="trace_return")
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# header
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if args.timestamp:
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print("%-14s" % ("TIME(s)"), end="")
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print("%-6s %-16s %4s %3s %s" % ("PID", "COMM", "FD", "ERR", "PATH"))
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start_ts = 0
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# format output
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while 1:
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(task, pid, cpu, flags, ts, msg) = b.trace_fields()
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(ret_s, filename) = msg.split(" ", 1)
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ret = int(ret_s)
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if (args.failed and (ret >= 0)):
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continue
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# split return value into FD and errno columns
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if ret >= 0:
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fd_s = ret
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err = 0
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else:
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fd_s = "-1"
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err = - ret
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# print columns
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if args.timestamp:
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if start_ts == 0:
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start_ts = ts
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print("%-14.9f" % (ts - start_ts), end="")
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print("%-6d %-16s %4s %3s %s" % (pid, task, fd_s, err, filename))
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