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On-demand system call tracing for Python programs.

Project description

Ptracer is a library providing on-demand system call tracing in Python programs.

Basic Usage

import traceback
import ptracer

def callback(syscall):
    print('{}({}) -> {}'.format(,
        ', '.join(repr(arg.value) for arg in syscall.args),
    print('Traceback: ')

with ptracer.context(callback):
    open('/dev/null', 'wb')


Ptracer allows elaborate syscall filtering via the filter argument:

flt = [
            lambda arg: arg.value & os.O_WRONLY
        result=lambda res: res.value > 0

with ptracer.context(callback, filter=flt):
    # traced code

In the above example, ptracer will invoke the callback only for successful attempts to open files in the “/tmp” directory for writing.


The documentation is available on

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