examples: Make some improvements for stacksnoop.py
diff --git a/examples/tracing/stacksnoop.py b/examples/tracing/stacksnoop.py
index 827c1c1..b08eac9 100755
--- a/examples/tracing/stacksnoop.py
+++ b/examples/tracing/stacksnoop.py
@@ -13,7 +13,6 @@
from __future__ import print_function
from bcc import BPF
import argparse
-import ctypes as ct
import time
# arguments
@@ -79,13 +78,6 @@
TASK_COMM_LEN = 16 # linux/sched.h
-class Data(ct.Structure):
- _fields_ = [
- ("stack_id", ct.c_ulonglong),
- ("pid", ct.c_uint),
- ("comm", ct.c_char * TASK_COMM_LEN),
- ]
-
matched = b.num_open_kprobes()
if matched == 0:
print("Function \"%s\" not found. Exiting." % function)
@@ -102,18 +94,18 @@
print("%-18s %s" % ("TIME(s)", "FUNCTION"))
def print_event(cpu, data, size):
- event = ct.cast(data, ct.POINTER(Data)).contents
+ event = b["events"].event(data)
ts = time.time() - start_ts
if verbose:
print("%-18.9f %-12.12s %-6d %-3d %s" %
- (ts, event.comm.decode(), event.pid, cpu, function))
+ (ts, event.comm.decode('utf-8', 'replace'), event.pid, cpu, function))
else:
print("%-18.9f %s" % (ts, function))
for addr in stack_traces.walk(event.stack_id):
- sym = b.ksym(addr, show_offset=offset)
+ sym = b.ksym(addr, show_offset=offset).decode('utf-8', 'replace')
print("\t%s" % sym)
print()
diff --git a/examples/tracing/vfsreadlat.py b/examples/tracing/vfsreadlat.py
index b2c4156..4fbfded 100755
--- a/examples/tracing/vfsreadlat.py
+++ b/examples/tracing/vfsreadlat.py
@@ -17,7 +17,6 @@
from __future__ import print_function
from bcc import BPF
-from ctypes import c_ushort, c_int, c_ulonglong
from time import sleep
from sys import argv
