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Migrated killsnoop to bpf_perf_event
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Original file line number | Diff line number | Diff line change |
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#!/usr/bin/python | ||
# @lint-avoid-python-3-compatibility-imports | ||
# | ||
# killsnoop Trace signals issued by the kill() syscall. | ||
# For Linux, uses BCC, eBPF. Embedded C. | ||
# | ||
# USAGE: killsnoop [-h] [-t] [-x] [-p PID] | ||
# | ||
# Copyright (c) 2015 Brendan Gregg. | ||
# Licensed under the Apache License, Version 2.0 (the "License") | ||
# | ||
# 20-Sep-2015 Brendan Gregg Created this. | ||
|
||
from __future__ import print_function | ||
from bcc import BPF | ||
import argparse | ||
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# arguments | ||
examples = """examples: | ||
./killsnoop # trace all kill() signals | ||
./killsnoop -t # include timestamps | ||
./killsnoop -x # only show failed kills | ||
./killsnoop -p 181 # only trace PID 181 | ||
""" | ||
parser = argparse.ArgumentParser( | ||
description="Trace signals issued by the kill() syscall", | ||
formatter_class=argparse.RawDescriptionHelpFormatter, | ||
epilog=examples) | ||
parser.add_argument("-t", "--timestamp", action="store_true", | ||
help="include timestamp on output") | ||
parser.add_argument("-x", "--failed", action="store_true", | ||
help="only show failed opens") | ||
parser.add_argument("-p", "--pid", | ||
help="trace this PID only") | ||
args = parser.parse_args() | ||
debug = 0 | ||
|
||
# define BPF program | ||
bpf_text = """ | ||
#include <uapi/linux/ptrace.h> | ||
BPF_HASH(args_pid, u32, int); | ||
BPF_HASH(args_sig, u32, int); | ||
int kprobe__sys_kill(struct pt_regs *ctx, int tpid, int sig) | ||
{ | ||
u32 pid = bpf_get_current_pid_tgid(); | ||
FILTER | ||
args_pid.update(&pid, &tpid); | ||
args_sig.update(&pid, &sig); | ||
return 0; | ||
}; | ||
int kretprobe__sys_kill(struct pt_regs *ctx) | ||
{ | ||
int *tpidp, *sigp, ret = ctx->ax; | ||
u32 pid = bpf_get_current_pid_tgid(); | ||
tpidp = args_pid.lookup(&pid); | ||
sigp = args_sig.lookup(&pid); | ||
if (tpidp == 0 || sigp == 0) { | ||
return 0; // missed entry | ||
} | ||
bpf_trace_printk("%d %d %d\\n", *tpidp, *sigp, ret); | ||
args_pid.delete(&pid); | ||
args_sig.delete(&pid); | ||
return 0; | ||
} | ||
""" | ||
if args.pid: | ||
bpf_text = bpf_text.replace('FILTER', | ||
'if (pid != %s) { return 0; }' % args.pid) | ||
else: | ||
bpf_text = bpf_text.replace('FILTER', '') | ||
if debug: | ||
print(bpf_text) | ||
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# initialize BPF | ||
b = BPF(text=bpf_text) | ||
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# header | ||
if args.timestamp: | ||
print("%-14s" % ("TIME(s)"), end="") | ||
print("%-6s %-16s %-4s %-6s %s" % ("PID", "COMM", "SIG", "TPID", "RESULT")) | ||
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start_ts = 0 | ||
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# format output | ||
while 1: | ||
(task, pid, cpu, flags, ts, msg) = b.trace_fields() | ||
(tpid_s, sig_s, ret_s) = msg.split(" ") | ||
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ret = int(ret_s) | ||
if (args.failed and (ret >= 0)): | ||
continue | ||
|
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# print columns | ||
if args.timestamp: | ||
if start_ts == 0: | ||
start_ts = ts | ||
print("%-14.9f" % (ts - start_ts), end="") | ||
print("%-6d %-16s %-4s %-6s %s" % (pid, task, sig_s, tpid_s, ret_s)) |