bindings/python/examples/example-api-test.py

   1 #!/usr/bin/env python3
   2 # example_api_test.py
   3 #
   4 # Babeltrace example script based on the Babeltrace API test script
   5 #
   6 # Copyright 2012 EfficiOS Inc.
   7 #
   8 # Author: Danny Serres <danny.serres@efficios.com>
   9 #
  10 # Permission is hereby granted, free of charge, to any person obtaining a copy
  11 # of this software and associated documentation files (the "Software"), to deal
  12 # in the Software without restriction, including without limitation the rights
  13 # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  14 # copies of the Software, and to permit persons to whom the Software is
  15 # furnished to do so, subject to the following conditions:
  16 #
  17 # The above copyright notice and this permission notice shall be included in
  18 # all copies or substantial portions of the Software.
  19
  20 # This example uses the babeltrace python module
  21 # to partially test the api.
  22
  23 import sys
  24 from babeltrace import *
  25
  26 # Check for path arg:
  27 if len(sys.argv) < 2:
  28         raise TypeError("Usage: python example-api-test.py path/to/file")
  29
  30 # Create TraceCollection and add trace:
  31 traces = TraceCollection()
  32 trace_handle = traces.add_trace(sys.argv[1], "ctf")
  33 if trace_handle is None:
  34         raise IOError("Error adding trace")
  35
  36 # Listing events
  37 print("--- Event list ---")
  38 for event_declaration in trace_handle.events:
  39         print("event : {}".format(event_declaration.name))
  40         if event_declaration.name == "sched_switch":
  41                 for field_declaration in event_declaration.fields:
  42                         print(field_declaration)
  43 print("--- Done ---")
  44
  45 for event in traces.events:
  46         print("TS: {}, {} : {}".format(event.timestamp, event.cycles, event.name))
  47
  48         if event.name == "sched_switch":
  49                 prev_comm = event["prev_comm"]
  50                 if prev_comm is None:
  51                         print("ERROR: Missing prev_comm context info")
  52                 else:
  53                         print("sched_switch prev_comm: {}".format(prev_comm))
  54
  55         if event.name == "exit_syscall":
  56                 ret_code = event["ret"]
  57                 if ret_code is None:
  58                         print("ERROR: Unable to extract ret")
  59                 else:
  60                         print("exit_syscall ret: {}".format(ret_code))