On 15.04.22 г. 7:10 ч., Tzvetomir Stoyanov (VMware) wrote:
Proposed example illustrates how to use uprobes high level API to trace
all functions for user program. It can be attached to already running
program, or run the program and trace its execution.
Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@xxxxxxxxx>
---
examples/user_trace.py | 43 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 43 insertions(+)
create mode 100755 examples/user_trace.py
diff --git a/examples/user_trace.py b/examples/user_trace.py
new file mode 100755
index 0000000..640ace8
--- /dev/null
+++ b/examples/user_trace.py
@@ -0,0 +1,43 @@
+#!/usr/bin/env python3
+
+"""
+SPDX-License-Identifier: CC-BY-4.0
+
+Copyright 2022 VMware Inc, Tzvetomir Stoyanov (VMware) <tz.stoyanov@xxxxxxxxx>
+"""
+
+import sys
+import shutil
+
+import tracecruncher.ftracepy as ft
+
+if __name__ == "__main__":
+ if len(sys.argv) < 2:
+ print('Usage: ', sys.argv[0], ' [PROCESS]')
print('Usage: ', sys.argv[0], ' [PROCESS or PID]')
+ sys.exit(1)
+
+ # Create new Ftrace instance to work in. The tracing in this new instance
+ # is not going to be enabled yet.
+ inst = ft.create_instance(tracing_on=False)
+
+ # Create a user tracing context for given process, exclude the libraries
+ if sys.argv[1].isdigit():
+ utrace = ft.user_trace(pid=int(sys.argv[1]), follow_libs=False)
+ else:
+ file = shutil.which(sys.argv[1])
+ if file is None:
+ print('Cannot find ', sys.argv[1], ' in the system')
+ sys.exit(1)
+ utrace = ft.user_trace(name=file, argv=sys.argv[1:], follow_libs=False)
+
+ # Trace execution of all available functions in the given process
+ utrace.add_function(fname = "*")
No need for spaces around '='.
+ + # Add trace points on functions return as well + utrace.add_ret_function(fname = "*")
Same here
+ + # Start tracing in an instance + utrace.enable(instance = inst, wait=False)
and here.
+ + # Read the trace buffer during the trace until ctrl-c is pressed + ft.read_trace(instance=inst) \ No newline at end of file
Add new line at the end.
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